============
Linux Fomula
============

Linux Operating Systems.

* Ubuntu
* CentOS
* RedHat
* Fedora
* Arch

Sample Pillars
==============


Linux System
------------

Basic Linux box

.. code-block:: yaml

    linux:
      system:
        enabled: true
        name: 'node1'
        domain: 'domain.com'
        cluster: 'system'
        environment: prod
        timezone: 'Europe/Prague'
        utc: true

Linux with system users, some with password set:
.. WARNING::
If no 'password' variable has been passed - any predifined password
will be removed.

.. code-block:: yaml

    linux:
      system:
        ...
        user:
          jdoe:
            name: 'jdoe'
            enabled: true
            sudo: true
            shell: /bin/bash
            full_name: 'Jonh Doe'
            home: '/home/jdoe'
            email: 'jonh@doe.com'
          jsmith:
            name: 'jsmith'
            enabled: true
            full_name: 'With clear password'
            home: '/home/jsmith'
            hash_password: true
            password: "userpassword"
          mark:
            name: 'mark'
            enabled: true
            full_name: "unchange password'
            home: '/home/mark'
            password: false
          elizabeth:
            name: 'elizabeth'
            enabled: true
            full_name: 'With hased password'
            home: '/home/elizabeth'
            password: "$6$nUI7QEz3$dFYjzQqK5cJ6HQ38KqG4gTWA9eJu3aKx6TRVDFh6BVJxJgFWg2akfAA7f1fCxcSUeOJ2arCO6EEI6XXnHXxG10"

Configure sudo for users and groups under ``/etc/sudoers.d/``.
This ways ``linux.system.sudo`` pillar map to actual sudo attributes:

.. code-block:: jinja

   # simplified template:
   Cmds_Alias {{ alias }}={{ commands }}
   {{ user }}   {{ hosts }}=({{ runas }}) NOPASSWD: {{ commands }}
   %{{ group }} {{ hosts }}=({{ runas }}) NOPASSWD: {{ commands }}

   # when rendered:
   saltuser1 ALL=(ALL) NOPASSWD: ALL

.. code-block:: yaml

  linux:
    system:
      sudo:
        enabled: true
        aliases:
          host:
            LOCAL:
            - localhost
            PRODUCTION:
            - db1
            - db2
          runas:
            DBA:
            - postgres
            - mysql
            SALT:
            - root
          command:
            # Note: This is not 100% safe when ALL keyword is used, user still may modify configs and hide his actions.
            #       Best practice is to specify full list of commands user is allowed to run.
            SUPPORT_RESTRICTED:
            - /bin/vi /etc/sudoers*
            - /bin/vim /etc/sudoers*
            - /bin/nano /etc/sudoers*
            - /bin/emacs /etc/sudoers*
            - /bin/su - root
            - /bin/su -
            - /bin/su
            - /usr/sbin/visudo
            SUPPORT_SHELLS:
            - /bin/sh
            - /bin/ksh
            - /bin/bash
            - /bin/rbash
            - /bin/dash
            - /bin/zsh
            - /bin/csh
            - /bin/fish
            - /bin/tcsh
            - /usr/bin/login
            - /usr/bin/su
            - /usr/su
            ALL_SALT_SAFE:
            - /usr/bin/salt state*
            - /usr/bin/salt service*
            - /usr/bin/salt pillar*
            - /usr/bin/salt grains*
            - /usr/bin/salt saltutil*
            - /usr/bin/salt-call state*
            - /usr/bin/salt-call service*
            - /usr/bin/salt-call pillar*
            - /usr/bin/salt-call grains*
            - /usr/bin/salt-call saltutil*
            SALT_TRUSTED:
            - /usr/bin/salt*
        users:
          # saltuser1 with default values: saltuser1 ALL=(ALL) NOPASSWD: ALL
          saltuser1: {}
          saltuser2:
            hosts:
            - LOCAL
          # User Alias DBA
          DBA:
            hosts:
            - ALL
            commands:
            - ALL_SALT_SAFE
        groups:
          db-ops:
            hosts:
            - ALL
            - '!PRODUCTION'
            runas:
            - DBA
            commands:
            - /bin/cat *
            - /bin/less *
            - /bin/ls *
          salt-ops:
            hosts:
            - 'ALL'
            runas:
            - SALT
            commands:
            - SUPPORT_SHELLS
          salt-ops-2nd:
            name: salt-ops
            nopasswd: false
            setenv: true # Enable sudo -E option
            runas:
            - DBA
            commands:
            - ALL
            - '!SUPPORT_SHELLS'
            - '!SUPPORT_RESTRICTED'

Linux with package, latest version

.. code-block:: yaml

    linux:
      system:
        ...
        package:
          package-name:
            version: latest

Linux with package from certail repo, version with no upgrades

.. code-block:: yaml

    linux:
      system:
        ...
        package:
          package-name:
            version: 2132.323
            repo: 'custom-repo'
            hold: true

Linux with package from certail repo, version with no GPG verification

.. code-block:: yaml

    linux:
      system:
        ...
        package:
          package-name:
            version: 2132.323
            repo: 'custom-repo'
            verify: false

Linux with autoupdates (automatically install security package updates)

.. code-block:: yaml

    linux:
      system:
        ...
        autoupdates:
          enabled: true
          mail: root@localhost
          mail_only_on_error: true
          remove_unused_dependencies: false
          automatic_reboot: true
          automatic_reboot_time: "02:00"

Linux with cron jobs
By default it will use name as an identifier, unless identifier key is
explicitly set or False (then it will use Salt's default behavior which is
identifier same as command resulting in not being able to change it)

.. code-block:: yaml

    linux:
      system:
        ...
        job:
          cmd1:
            command: '/cmd/to/run'
            identifier: cmd1
            enabled: true
            user: 'root'
            hour: 2
            minute: 0

Linux security limits (limit sensu user memory usage to max 1GB):

.. code-block:: yaml

    linux:
      system:
        ...
        limit:
          sensu:
            enabled: true
            domain: sensu
            limits:
              - type: hard
                item: as
                value: 1000000

Enable autologin on tty1 (may work only for Ubuntu 14.04):

.. code-block:: yaml

    linux:
      system:
        console:
          tty1:
            autologin: root
          # Enable serial console
          ttyS0:
            autologin: root
            rate: 115200
            term: xterm

To disable set autologin to `false`.

Set ``policy-rc.d`` on Debian-based systems. Action can be any available
command in ``while true`` loop and ``case`` context.
Following will disallow dpkg to stop/start services for cassandra package automatically:

.. code-block:: yaml

    linux:
      system:
        policyrcd:
          - package: cassandra
            action: exit 101
          - package: '*'
            action: switch

Set system locales:

.. code-block:: yaml

    linux:
      system:
        locale:
          en_US.UTF-8:
            default: true
          "cs_CZ.UTF-8 UTF-8":
            enabled: true

Systemd settings:

.. code-block:: yaml

    linux:
      system:
        ...
        systemd:
          system:
            Manager:
              DefaultLimitNOFILE: 307200
              DefaultLimitNPROC: 307200
          user:
            Manager:
              DefaultLimitCPU: 2
              DefaultLimitNPROC: 4

Ensure presence of directory:

.. code-block:: yaml

    linux:
      system:
        directory:
          /tmp/test:
            user: root
            group: root
            mode: 700
            makedirs: true

Ensure presence of file by specifying it's source:

.. code-block:: yaml

    linux:
      system:
        file:
          /tmp/test.txt:
            source: http://example.com/test.txt
            user: root
            group: root
            file_mode: 700
            dir_mode: 700
            encoding: utf-8
            hash: <<md5 hash>>
            makedirs: true

Ensure presence of file by specifying it's contents:

.. code-block:: yaml

    linux:
      system:
        file:
          /tmp/test.txt:
            contents: |
              line1
              line2
            user: root
            group: root
            file_mode: 700
            dir_mode: 700
            encoding: utf-8
            hash: <<md5 hash>>
            makedirs: true
Kernel
~~~~~~

Install always up to date LTS kernel and headers from Ubuntu trusty:

.. code-block:: yaml

    linux:
      system:
        kernel:
          type: generic
          lts: trusty
          headers: true

Load kernel modules and add them to `/etc/modules`:

.. code-block:: yaml

    linux:
      system:
        kernel:
          modules:
            - nf_conntrack
            - tp_smapi
            - 8021q

Configure or blacklist kernel modules with additional options to `/etc/modprobe.d` following example 
will add `/etc/modprobe.d/nf_conntrack.conf` file with line `options nf_conntrack hashsize=262144`:

.. code-block:: yaml

    linux:
      system:
        kernel:
          module:
            nf_conntrack:
              option:
                hashsize: 262144


Install specific kernel version and ensure all other kernel packages are
not present. Also install extra modules and headers for this kernel:

.. code-block:: yaml

    linux:
      system:
        kernel:
          type: generic
          extra: true
          headers: true
          version: 4.2.0-22

Systcl kernel parameters

.. code-block:: yaml

    linux:
      system:
        kernel:
          sysctl:
            net.ipv4.tcp_keepalive_intvl: 3
            net.ipv4.tcp_keepalive_time: 30
            net.ipv4.tcp_keepalive_probes: 8


CPU
~~~

Enable cpufreq governor for every cpu:

.. code-block:: yaml

    linux:
      system:
        cpu:
          governor: performance


CGROUPS
~~~~~~~

Setup linux cgroups:

.. code-block:: yaml

    linux:
      system:
        cgroup:
          enabled: true
          group:
            ceph_group_1:
              controller:
                cpu:
                  shares:
                    value: 250
                cpuacct:
                  usage:
                    value: 0
                cpuset:
                  cpus:
                    value: 1,2,3
                memory:
                  limit_in_bytes:
                    value: 2G
                  memsw.limit_in_bytes:
                    value: 3G
              mapping:
                subjects:
                - '@ceph'
            generic_group_1:
              controller:
                cpu:
                  shares:
                    value: 250
                cpuacct:
                  usage:
                    value: 0
              mapping:
                subjects:
                - '*:firefox'
                - 'student:cp'


Shared Libraries
~~~~~~~~~~~~~~~~

Set additional shared library to Linux system library path

.. code-block:: yaml

    linux:
      system:
        ld:
          library:
            java:
              - /usr/lib/jvm/jre-openjdk/lib/amd64/server
              - /opt/java/jre/lib/amd64/server
    

Certificates
~~~~~~~~~~~~

Add certificate authority into system trusted CA bundle

.. code-block:: yaml

    linux:
      system:
        ca_certificates:
          mycert: |
            -----BEGIN CERTIFICATE-----
            MIICPDCCAaUCEHC65B0Q2Sk0tjjKewPMur8wDQYJKoZIhvcNAQECBQAwXzELMAkG
            A1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMTcwNQYDVQQLEy5DbGFz
            cyAzIFB1YmxpYyBQcmltYXJ5IENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTk2
            MDEyOTAwMDAwMFoXDTI4MDgwMTIzNTk1OVowXzELMAkGA1UEBhMCVVMxFzAVBgNV
            BAoTDlZlcmlTaWduLCBJbmMuMTcwNQYDVQQLEy5DbGFzcyAzIFB1YmxpYyBQcmlt
            YXJ5IENlcnRpZmljYXRpb24gQXV0aG9yaXR5MIGfMA0GCSqGSIb3DQEBAQUAA4GN
            ADCBiQKBgQDJXFme8huKARS0EN8EQNvjV69qRUCPhAwL0TPZ2RHP7gJYHyX3KqhE
            BarsAx94f56TuZoAqiN91qyFomNFx3InzPRMxnVx0jnvT0Lwdd8KkMaOIG+YD/is
            I19wKTakyYbnsZogy1Olhec9vn2a/iRFM9x2Fe0PonFkTGUugWhFpwIDAQABMA0G
            CSqGSIb3DQEBAgUAA4GBALtMEivPLCYATxQT3ab7/AoRhIzzKBxnki98tsX63/Do
            lbwdj2wsqFHMc9ikwFPwTtYmwHYBV4GSXiHx0bH/59AhWM1pF+NEHJwZRDmJXNyc
            AA9WjQKZ7aKQRUzkuxCkPfAyAw7xzvjoyVGM5mKf5p/AfbdynMk2OmufTqj/ZA1k
            -----END CERTIFICATE-----

Sysfs
~~~~~

Install sysfsutils and set sysfs attributes:

.. code-block:: yaml

    linux:
      system:
        sysfs:
          scheduler:
            block/sda/queue/scheduler: deadline
          power:
            mode:
              power/state: 0660
            owner:
              power/state: "root:power"
            devices/system/cpu/cpu0/cpufreq/scaling_governor: powersave

Huge Pages
~~~~~~~~~~~~

Huge Pages give a performance boost to applications that intensively deal
with memory allocation/deallocation by decreasing memory fragmentation.

.. code-block:: yaml

    linux:
      system:
        kernel:
          hugepages:
            small:
              size: 2M
              count: 107520
              mount_point: /mnt/hugepages_2MB
              mount: false/true # default false
            large:
              default: true # default automatically mounted
              size: 1G
              count: 210
              mount_point: /mnt/hugepages_1GB

Note: not recommended to use both pagesizes in concurrently.

Intel SR-IOV
~~~~~~~~~~~~

PCI-SIG Single Root I/O Virtualization and Sharing (SR-IOV) specification defines a standardized mechanism to virtualize PCIe devices. The mechanism can virtualize a single PCIe Ethernet controller to appear as multiple PCIe devices.

.. code-block:: yaml

    linux:
      system:
        kernel:
          sriov: True
          unsafe_interrupts: False # Default is false. for older platforms and AMD we need to add interrupt remapping workaround
        rc:
          local: |
            #!/bin/sh -e
            # Enable 7 VF on eth1
            echo 7 > /sys/class/net/eth1/device/sriov_numvfs; sleep 2; ifup -a
            exit 0

Isolate CPU options
~~~~~~~~~~~~~~~~~~~

Remove the specified CPUs, as defined by the cpu_number values, from the general kernel
SMP balancing and scheduler algroithms. The only way to move a process onto or off an
"isolated" CPU is via the CPU affinity syscalls. cpu_number begins at 0, so the
maximum value is 1 less than the number of CPUs on the system.

.. code-block:: yaml

    linux:
      system:
        kernel:
          isolcpu: 1,2,3,4,5,6,7 # isolate first cpu 0

Repositories
~~~~~~~~~~~~

RedHat based Linux with additional OpenStack repo

.. code-block:: yaml

    linux:
      system:
        ...
        repo:
          rdo-icehouse:
            enabled: true
            source: 'http://repos.fedorapeople.org/repos/openstack/openstack-icehouse/epel-6/'
            pgpcheck: 0

Ensure system repository to use czech Debian mirror (``default: true``)
Also pin it's packages with priority 900.

.. code-block:: yaml

   linux:
     system:
       repo:
         debian:
           default: true
           source: "deb http://ftp.cz.debian.org/debian/ jessie main contrib non-free"
           # Import signing key from URL if needed
           key_url: "http://dummy.com/public.gpg"
           pin:
             - pin: 'origin "ftp.cz.debian.org"'
               priority: 900
               package: '*'


Package manager proxy setup globally:

.. code-block:: yaml

    linux:
      system:
        ...
        repo:
          apt-mk:
            source: "deb http://apt-mk.mirantis.com/ stable main salt"
        ...
        proxy:
          pkg:
            enabled: true
            ftp:   ftp://ftp-proxy-for-apt.host.local:2121
          ...
          # NOTE: Global defaults for any other componet that configure proxy on the system.
          #       If your environment has just one simple proxy, set it on linux:system:proxy.
          #
          # fall back system defaults if linux:system:proxy:pkg has no protocol specific entries
          # as for https and http
          ftp:   ftp://proxy.host.local:2121
          http:  http://proxy.host.local:3142
          https: https://proxy.host.local:3143

Package manager proxy setup per repository:

.. code-block:: yaml

    linux:
      system:
        ...
        repo:
          debian:
            source: "deb http://apt-mk.mirantis.com/ stable main salt"
        ...
          apt-mk:
            source: "deb http://apt-mk.mirantis.com/ stable main salt"
            # per repository proxy
            proxy:
              enabled: true
              http:  http://maas-01:8080
              https: http://maas-01:8080
        ...
        proxy:
          # package manager fallback defaults
          # used if linux:system:repo:apt-mk:proxy has no protocol specific entries
          pkg:
            enabled: true
            ftp:   ftp://proxy.host.local:2121
            #http:  http://proxy.host.local:3142
            #https: https://proxy.host.local:3143
          ...
          # global system fallback system defaults
          ftp:   ftp://proxy.host.local:2121
          http:  http://proxy.host.local:3142
          https: https://proxy.host.local:3143


Remove all repositories:

.. code-block:: yaml

    linux:
      system:
        purge_repos: true

Setup custom apt config options:

.. code-block:: yaml

    linux:
      system:
        apt:
          config:
            compression-workaround:
              "Acquire::CompressionTypes::Order": "gz"
            docker-clean:
              "DPkg::Post-Invoke":
                - "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"
              "APT::Update::Post-Invoke":
                - "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"

RC
~~

rc.local example

.. code-block:: yaml

   linux:
     system:
       rc:
         local: |
           #!/bin/sh -e
           #
           # rc.local
           #
           # This script is executed at the end of each multiuser runlevel.
           # Make sure that the script will "exit 0" on success or any other
           # value on error.
           #
           # In order to enable or disable this script just change the execution
           # bits.
           #
           # By default this script does nothing.
           exit 0


Prompt
~~~~~~

Setting prompt is implemented by creating ``/etc/profile.d/prompt.sh``. Every
user can have different prompt.

.. code-block:: yaml

    linux:
      system:
        prompt:
          root: \\n\\[\\033[0;37m\\]\\D{%y/%m/%d %H:%M:%S} $(hostname -f)\\[\\e[0m\\]\\n\\[\\e[1;31m\\][\\u@\\h:\\w]\\[\\e[0m\\]
          default: \\n\\D{%y/%m/%d %H:%M:%S} $(hostname -f)\\n[\\u@\\h:\\w]

On Debian systems to set prompt system-wide it's necessary to remove setting
PS1 in ``/etc/bash.bashrc`` and ``~/.bashrc`` (which comes from
``/etc/skel/.bashrc``). This formula will do this automatically, but will not
touch existing user's ``~/.bashrc`` files except root.

Bash
~~~~

Fix bash configuration to preserve history across sessions (like ZSH does by
default).

.. code-block:: yaml

    linux:
      system:
        bash:
          preserve_history: true

Message of the day
~~~~~~~~~~~~~~~~~~

``pam_motd`` from package ``update-motd`` is used for dynamic messages of the
day. Setting custom motd will cleanup existing ones.

.. code-block:: yaml

    linux:
      system:
        motd:
          - release: |
              #!/bin/sh
              [ -r /etc/lsb-release ] && . /etc/lsb-release

              if [ -z "$DISTRIB_DESCRIPTION" ] && [ -x /usr/bin/lsb_release ]; then
              	# Fall back to using the very slow lsb_release utility
              	DISTRIB_DESCRIPTION=$(lsb_release -s -d)
              fi

              printf "Welcome to %s (%s %s %s)\n" "$DISTRIB_DESCRIPTION" "$(uname -o)" "$(uname -r)" "$(uname -m)"
          - warning: |
              #!/bin/sh
              printf "This is [company name] network.\n"
              printf "Unauthorized access strictly prohibited.\n"

Services
~~~~~~~~

Stop and disable linux service:

.. code-block:: yaml

    linux:
      system:
        service:
          apt-daily.timer:
            status: dead

Possible status is dead (disable service by default), running (enable service by default), enabled, disabled.

Linux with atop service:

.. code-block:: yaml

    linux:
      system:
        atop:
          enabled: true
          interval: 20
          logpath: "/var/log/atop"
          outfile: "/var/log/atop/daily.log"

RHEL / CentOS
^^^^^^^^^^^^^

Unfortunately ``update-motd`` is currently not available for RHEL so there's
no native support for dynamic motd.
You can still set static one, only pillar structure differs:

.. code-block:: yaml

    linux:
      system:
        motd: |
          This is [company name] network.
          Unauthorized access strictly prohibited.

Haveged
~~~~~~~

If you are running headless server and are low on entropy, it may be a good
idea to setup Haveged.

.. code-block:: yaml

    linux:
      system:
        haveged:
          enabled: true

Linux network
-------------

Linux with network manager

.. code-block:: yaml

    linux:
      network:
        enabled: true
        network_manager: true

Linux with default static network interfaces, default gateway interface and DNS servers

.. code-block:: yaml

    linux:
      network:
        enabled: true
        interface:
          eth0:
            enabled: true
            type: eth
            address: 192.168.0.102
            netmask: 255.255.255.0
            gateway: 192.168.0.1
            name_servers:
            - 8.8.8.8
            - 8.8.4.4
            mtu: 1500

Linux with bonded interfaces and disabled NetworkManager

.. code-block:: yaml

    linux:
      network:
        enabled: true
        interface:
          eth0:
            type: eth
            ...
          eth1:
            type: eth
            ...
          bond0:
            enabled: true
            type: bond
            address: 192.168.0.102
            netmask: 255.255.255.0
            mtu: 1500
            use_in:
            - interface: ${linux:interface:eth0}
            - interface: ${linux:interface:eth0}
        network_manager:
          disable: true

Linux with vlan interface_params

.. code-block:: yaml

    linux:
      network:
        enabled: true
        interface:
          vlan69:
            type: vlan
            use_interfaces:
            - interface: ${linux:interface:bond0}

Linux with wireless interface parameters

.. code-block:: yaml

    linux:
      network:
        enabled: true
        gateway: 10.0.0.1
        default_interface: eth0
        interface:
          wlan0:
            type: eth
            wireless:
              essid: example
              key: example_key
              security: wpa
              priority: 1

Linux networks with routes defined

.. code-block:: yaml

    linux:
      network:
        enabled: true
        gateway: 10.0.0.1
        default_interface: eth0
        interface:
          eth0:
            type: eth
            route:
              default:
                address: 192.168.0.123
                netmask: 255.255.255.0
                gateway: 192.168.0.1

Native Linux Bridges

.. code-block:: yaml

    linux:
      network:
        interface:
          eth1:
            enabled: true
            type: eth
            proto: manual
            up_cmds:
            - ip address add 0/0 dev $IFACE
            - ip link set $IFACE up
            down_cmds:
            - ip link set $IFACE down
          br-ex:
            enabled: true
            type: bridge
            address: ${linux:network:host:public_local:address}
            netmask: 255.255.255.0
            use_interfaces:
            - eth1

OpenVswitch Bridges

.. code-block:: yaml

    linux:
      network:
        bridge: openvswitch
        interface:
          eth1:
            enabled: true
            type: eth
            proto: manual
            up_cmds:
            - ip address add 0/0 dev $IFACE
            - ip link set $IFACE up
            down_cmds:
            - ip link set $IFACE down
          br-ex:
            enabled: true
            type: bridge
            address: ${linux:network:host:public_local:address}
            netmask: 255.255.255.0
            use_interfaces:
            - eth1
          br-prv:
            enabled: true
            type: ovs_bridge
            mtu: 65000
          br-ens7:
            enabled: true
            name: br-ens7
            type: ovs_bridge
            proto: manual
            mtu: 9000
            use_interfaces:
            - ens7
          patch-br-ens7-br-prv:
            enabled: true
            name: ens7-prv
            ovs_type: ovs_port
            type: ovs_port
            bridge: br-ens7
            port_type: patch
            peer: prv-ens7
            mtu: 65000
          patch-br-prv-br-ens7:
            enabled: true
            name: prv-ens7
            bridge: br-prv
            ovs_type: ovs_port
            type: ovs_port
            port_type: patch
            peer: ens7-prv
            mtu: 65000
          ens7:
            enabled: true
            name: ens7
            proto: manual
            ovs_port_type: OVSPort
            type: ovs_port
            ovs_bridge: br-ens7
            bridge: br-ens7

Debian manual proto interfaces

When you are changing interface proto from static in up state to manual, you
may need to flush ip addresses. For example, if you want to use the interface
and the ip on the bridge. This can be done by setting the ``ipflush_onchange``
to true.

.. code-block:: yaml

    linux:
      network:
        interface:
          eth1:
            enabled: true
            type: eth
            proto: manual
            mtu: 9100
            ipflush_onchange: true

Debian static proto interfaces

When you are changing interface proto from dhcp in up state to static, you
may need to flush ip addresses and restart interface to assign ip address from a managed file.
For example, if you want to use the interface and the ip on the bridge.
This can be done by setting the ``ipflush_onchange`` with combination
``restart_on_ipflush`` param set to to true.

.. code-block:: yaml

    linux:
      network:
        interface:
          eth1:
            enabled: true
            type: eth
            proto: static
            address: 10.1.0.22
            netmask: 255.255.255.0
            ipflush_onchange: true
            restart_on_ipflush: true

Concatinating and removing interface files

Debian based distributions have `/etc/network/interfaces.d/` directory, where
you can store configuration of network interfaces in separate files. You can
concatinate the files to the defined destination when needed, this operation
removes the file from the `/etc/network/interfaces.d/`. If you just need to
remove iface files, you can use the `remove_iface_files` key.

.. code-block:: yaml

    linux:
      network:
        concat_iface_files:
        - src: '/etc/network/interfaces.d/50-cloud-init.cfg'
          dst: '/etc/network/interfaces'
        remove_iface_files:
        - '/etc/network/interfaces.d/90-custom.cfg'


DHCP client configuration

None of the keys is mandatory, include only those you really need. For full list
of available options under send, supersede, prepend, append refer to dhcp-options(5)

.. code-block:: yaml

     linux:
       network:
         dhclient:
           enabled: true
           backoff_cutoff: 15
           initial_interval: 10
           reboot: 10
           retry: 60
           select_timeout: 0
           timeout: 120
           send:
             - option: host-name
               declaration: "= gethostname()"
           supersede:
             - option: host-name
               declaration: "spaceship"
             - option: domain-name
               declaration: "domain.home"
             #- option: arp-cache-timeout
             #  declaration: 20
           prepend:
             - option: domain-name-servers
               declaration:
                 - 8.8.8.8
                 - 8.8.4.4
             - option: domain-search
               declaration:
                 - example.com
                 - eng.example.com
           #append:
             #- option: domain-name-servers
             #  declaration: 127.0.0.1
           # ip or subnet to reject dhcp offer from
           reject:
             - 192.33.137.209
             - 10.0.2.0/24
           request:
             - subnet-mask
             - broadcast-address
             - time-offset
             - routers
             - domain-name
             - domain-name-servers
             - domain-search
             - host-name
             - dhcp6.name-servers
             - dhcp6.domain-search
             - dhcp6.fqdn
             - dhcp6.sntp-servers
             - netbios-name-servers
             - netbios-scope
             - interface-mtu
             - rfc3442-classless-static-routes
             - ntp-servers
           require:
             - subnet-mask
             - domain-name-servers
           # if per interface configuration required add below
           interface:
             ens2:
               initial_interval: 11
               reject:
                 - 192.33.137.210
             ens3:
               initial_interval: 12
               reject:
                 - 192.33.137.211

Linux network systemd settings:

.. code-block:: yaml

    linux:
      network:
        ...
        systemd:
          link:
            10-iface-dmz:
              Match:
                MACAddress: c8:5b:67:fa:1a:af
                OriginalName: eth0
              Link:
                Name: dmz0
          netdev:
            20-bridge-dmz:
              match:
                name: dmz0
              network:
                mescription: bridge
                bridge: br-dmz0
          network:
          # works with lowercase, keys are by default capitalized
            40-dhcp:
              match:
                name: '*'
              network:
                DHCP: yes


Configure global environment variables

Use ``/etc/environment`` for static system wide variable assignment after
boot. Variable expansion is frequently not supported.

.. code-block:: yaml

    linux:
      system:
        env:
          BOB_VARIABLE: Alice
          ...
          BOB_PATH:
            - /srv/alice/bin
            - /srv/bob/bin
          ...
          ftp_proxy:   none
          http_proxy:  http://global-http-proxy.host.local:8080
          https_proxy: ${linux:system:proxy:https}
          no_proxy:
            - 192.168.0.80
            - 192.168.1.80
            - .domain.com
            - .local
        ...
        # NOTE: global defaults proxy configuration.
        proxy:
          ftp:   ftp://proxy.host.local:2121
          http:  http://proxy.host.local:3142
          https: https://proxy.host.local:3143
          noproxy:
            - .domain.com
            - .local

Configure profile.d scripts

The profile.d scripts are being sourced during .sh execution and support
variable expansion in opposite to /etc/environment global settings in
``/etc/environment``.

.. code-block:: yaml

    linux:
      system:
        profile:
          locales: |
            export LANG=C
            export LC_ALL=C
          ...
          vi_flavors.sh: |
            export PAGER=view
            export EDITOR=vim
            alias vi=vim
          shell_locales.sh: |
            export LANG=en_US
            export LC_ALL=en_US.UTF-8
          shell_proxies.sh: |
            export FTP_PROXY=ftp://127.0.3.3:2121
            export NO_PROXY='.local'

Linux with hosts

Parameter purge_hosts will enforce whole /etc/hosts file, removing entries
that are not defined in model except defaults for both IPv4 and IPv6 localhost
and hostname + fqdn.

It's good to use this option if you want to ensure /etc/hosts is always in a
clean state however it's not enabled by default for safety.

.. code-block:: yaml

    linux:
      network:
        purge_hosts: true
        host:
          # No need to define this one if purge_hosts is true
          hostname:
            address: 127.0.1.1
            names:
            - ${linux:network:fqdn}
            - ${linux:network:hostname}
          node1:
            address: 192.168.10.200
            names:
            - node2.domain.com
            - service2.domain.com
          node2:
            address: 192.168.10.201
            names:
            - node2.domain.com
            - service2.domain.com

Linux with hosts collected from mine

In this case all dns records defined within infrastrucuture will be passed to
local hosts records or any DNS server. Only hosts with `grain` parameter to
true will be propagated to the mine.

.. code-block:: yaml

    linux:
      network:
        purge_hosts: true
        mine_dns_records: true
        host:
          node1:
            address: 192.168.10.200
            grain: true
            names:
            - node2.domain.com
            - service2.domain.com

Setup resolv.conf, nameservers, domain and search domains

.. code-block:: yaml

    linux:
      network:
        resolv:
          dns:
          - 8.8.4.4
          - 8.8.8.8
          domain: my.example.com
          search:
          - my.example.com
          - example.com
          options:
          - ndots: 5
          - timeout: 2
          - attempts: 2

setting custom TX queue length for tap interfaces

.. code-block:: yaml

    linux:
      network:
        tap_custom_txqueuelen: 10000

DPDK OVS interfaces

**DPDK OVS NIC**

.. code-block:: yaml

    linux:
      network:
        bridge: openvswitch
        dpdk:
          enabled: true
          driver: uio/vfio
        openvswitch:
          pmd_cpu_mask: "0x6"
          dpdk_socket_mem: "1024,1024"
          dpdk_lcore_mask: "0x400"
          memory_channels: 2
        interface:
          dpkd0:
            name: ${_param:dpdk_nic}
            pci: 0000:06:00.0
            driver: igb_uio/vfio-pci
            enabled: true
            type: dpdk_ovs_port
            n_rxq: 2
            pmd_rxq_affinity: "0:1,1:2"
            bridge: br-prv
            mtu: 9000
          br-prv:
            enabled: true
            type: dpdk_ovs_bridge

**DPDK OVS Bond**

.. code-block:: yaml

    linux:
      network:
        bridge: openvswitch
        dpdk:
          enabled: true
          driver: uio/vfio
        openvswitch:
          pmd_cpu_mask: "0x6"
          dpdk_socket_mem: "1024,1024"
          dpdk_lcore_mask: "0x400"
          memory_channels: 2
        interface:
          dpdk_second_nic:
            name: ${_param:primary_second_nic}
            pci: 0000:06:00.0
            driver: igb_uio/vfio-pci
            bond: dpdkbond0
            enabled: true
            type: dpdk_ovs_port
            n_rxq: 2
            pmd_rxq_affinity: "0:1,1:2"
            mtu: 9000
          dpdk_first_nic:
            name: ${_param:primary_first_nic}
            pci: 0000:05:00.0
            driver: igb_uio/vfio-pci
            bond: dpdkbond0
            enabled: true
            type: dpdk_ovs_port
            n_rxq: 2
            pmd_rxq_affinity: "0:1,1:2"
            mtu: 9000
          dpdkbond0:
            enabled: true
            bridge: br-prv
            type: dpdk_ovs_bond
            mode: active-backup
          br-prv:
            enabled: true
            type: dpdk_ovs_bridge

**DPDK OVS bridge for VXLAN**

If VXLAN is used as tenant segmentation then ip address must be set on br-prv

.. code-block:: yaml

    linux:
      network:
        ...
        interface:
          br-prv:
            enabled: true
            type: dpdk_ovs_bridge
            address: 192.168.50.0
            netmask: 255.255.255.0
            tag: 101
            mtu: 9000

Linux storage
-------------

Linux with mounted Samba

.. code-block:: yaml

    linux:
      storage:
        enabled: true
        mount:
          samba1:
          - enabled: true
          - path: /media/myuser/public/
          - device: //192.168.0.1/storage
          - file_system: cifs
          - options: guest,uid=myuser,iocharset=utf8,file_mode=0777,dir_mode=0777,noperm

NFS mount

.. code-block:: yaml

  linux:
    storage:
      enabled: true
      mount:
        nfs_glance:
          enabled: true
          path: /var/lib/glance/images
          device: 172.16.10.110:/var/nfs/glance
          file_system: nfs
          opts: rw,sync


File swap configuration

.. code-block:: yaml

    linux:
      storage:
        enabled: true
        swap:
          file:
            enabled: true
            engine: file
            device: /swapfile
            size: 1024

Partition swap configuration

.. code-block:: yaml

    linux:
      storage:
        enabled: true
        swap:
          partition:
            enabled: true
            engine: partition
            device: /dev/vg0/swap

LVM group `vg1` with one device and `data` volume mounted into `/mnt/data`

.. code-block:: yaml

    parameters:
      linux:
        storage:
          mount:
            data:
              enabled: true
              device: /dev/vg1/data
              file_system: ext4
              path: /mnt/data
          lvm:
            vg1:
              enabled: true
              devices:
                - /dev/sdb
              volume:
                data:
                  size: 40G
                  mount: ${linux:storage:mount:data}

Create partitions on disk. Specify size in MB. It expects empty
disk without any existing partitions. (set startsector=1, if you want to start partitions from 2048)

.. code-block:: yaml

      linux:
        storage:
          disk:
            first_drive:
              startsector: 1
              name: /dev/loop1
              type: gpt
              partitions:
                - size: 200 #size in MB
                  type: fat32
                - size: 300 #size in MB
                  mkfs: True
                  type: xfs
            /dev/vda1:
              partitions:
                - size: 5
                  type: ext2
                - size: 10
                  type: ext4

Multipath with Fujitsu Eternus DXL

.. code-block:: yaml

    parameters:
      linux:
        storage:
          multipath:
            enabled: true
            blacklist_devices:
            - /dev/sda
            - /dev/sdb
            backends:
            - fujitsu_eternus_dxl

Multipath with Hitachi VSP 1000

.. code-block:: yaml

    parameters:
      linux:
        storage:
          multipath:
            enabled: true
            blacklist_devices:
            - /dev/sda
            - /dev/sdb
            backends:
            - hitachi_vsp1000

Multipath with IBM Storwize

.. code-block:: yaml

    parameters:
      linux:
        storage:
          multipath:
            enabled: true
            blacklist_devices:
            - /dev/sda
            - /dev/sdb
            backends:
            - ibm_storwize

Multipath with multiple backends

.. code-block:: yaml

    parameters:
      linux:
        storage:
          multipath:
            enabled: true
            blacklist_devices:
            - /dev/sda
            - /dev/sdb
            - /dev/sdc
            - /dev/sdd
            backends:
            - ibm_storwize
            - fujitsu_eternus_dxl
            - hitachi_vsp1000

PAM LDAP integration

.. code-block:: yaml

    parameters:
      linux:
        system:
          auth:
            enabled: true
            ldap:
              enabled: true
              binddn: cn=bind,ou=service_users,dc=example,dc=com
              bindpw: secret
              uri: ldap://127.0.0.1
              base: ou=users,dc=example,dc=com
              ldap_version: 3
              pagesize: 65536
              referrals: off
              filter:
                passwd: (&(&(objectClass=person)(uidNumber=*))(unixHomeDirectory=*))
                shadow: (&(&(objectClass=person)(uidNumber=*))(unixHomeDirectory=*))
                group:  (&(objectClass=group)(gidNumber=*))

Disabled multipath (the default setup)

.. code-block:: yaml

    parameters:
      linux:
        storage:
          multipath:
            enabled: false

Linux with local loopback device

.. code-block:: yaml

    linux:
      storage:
        loopback:
          disk1:
            file: /srv/disk1
            size: 50G

External config generation
--------------------------

You are able to use config support metadata between formulas and only generate
config files for external use, eg. docker, etc.

.. code-block:: yaml

    parameters:
      linux:
        system:
          config:
            pillar:
              jenkins:
                master:
                  home: /srv/volumes/jenkins
                  approved_scripts:
                    - method java.net.URL openConnection
                  credentials:
                    - type: username_password
                      scope: global
                      id: test
                      desc: Testing credentials
                      username: test
                      password: test

Netconsole Remote Kernel Logging
--------------------------------

Netconsole logger could be configured for configfs-enabled kernels
(`CONFIG_NETCONSOLE_DYNAMIC` should be enabled). Configuration applies both in
runtime (if network is already configured), and on-boot after interface
initialization. Notes:

 * receiver could be located only in same L3 domain
   (or you need to configure gateway MAC manually)
 * receiver's MAC is detected only on configuration time
 * using broadcast MAC is not recommended

.. code-block:: yaml

    parameters:
      linux:
        system:
          netconsole:
            enabled: true
            port: 514 (optional)
            loglevel: debug (optional)
            target:
              192.168.0.1:
                interface: bond0
                mac: "ff:ff:ff:ff:ff:ff" (optional)

Usage
=====

Set mtu of network interface eth0 to 1400

.. code-block:: bash

    ip link set dev eth0 mtu 1400

Read more
=========

* https://www.archlinux.org/
* http://askubuntu.com/questions/175172/how-do-i-configure-proxies-in-ubuntu-server-or-minimal-cli-ubuntu

Documentation and Bugs
======================

To learn how to install and update salt-formulas, consult the documentation
available online at:

    http://salt-formulas.readthedocs.io/

In the unfortunate event that bugs are discovered, they should be reported to
the appropriate issue tracker. Use Github issue tracker for specific salt
formula:

    https://github.com/salt-formulas/salt-formula-linux/issues

For feature requests, bug reports or blueprints affecting entire ecosystem,
use Launchpad salt-formulas project:

    https://launchpad.net/salt-formulas

You can also join salt-formulas-users team and subscribe to mailing list:

    https://launchpad.net/~salt-formulas-users

Developers wishing to work on the salt-formulas projects should always base
their work on master branch and submit pull request against specific formula.

    https://github.com/salt-formulas/salt-formula-linux

Any questions or feedback is always welcome so feel free to join our IRC
channel:

    #salt-formulas @ irc.freenode.net