diff --git a/tcp_tests/templates/mk22-lab-dvr/underlay--user-data-cfg01.yaml b/tcp_tests/templates/mk22-lab-dvr/underlay--user-data-cfg01.yaml
index 443e50c..6634617 100644
--- a/tcp_tests/templates/mk22-lab-dvr/underlay--user-data-cfg01.yaml
+++ b/tcp_tests/templates/mk22-lab-dvr/underlay--user-data-cfg01.yaml
@@ -7,7 +7,9 @@
      sudo: ALL=(ALL) NOPASSWD:ALL
      shell: /bin/bash
      ssh_authorized_keys:
-      - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCp0evjOaK8c8SKYK4r2+0BN7g+8YSvQ2n8nFgOURCyvkJqOHi1qPGZmuN0CclYVdVuZiXbWw3VxRbSW3EH736VzgY1U0JmoTiSamzLHaWsXvEIW8VCi7boli539QJP0ikJiBaNAgZILyCrVPN+A6mfqtacs1KXdZ0zlMq1BPtFciR1JTCRcVs5vP2Wwz5QtY2jMIh3aiwkePjMTQPcfmh1TkOlxYu5IbQyZ3G1ahA0mNKI9a0dtF282av/F6pwB/N1R1nEZ/9VtcN2I1mf1NW/tTHEEcTzXYo1R/8K9vlqAN8QvvGLZtZduGviNVNoNWvoxaXxDt8CPv2B2NCdQFZp
+     {% for key in config.underlay.ssh_keys %}
+      - ssh-rsa {{ key['public'] }}
+     {% endfor %}
 
   disable_root: false
   chpasswd:
@@ -55,38 +57,6 @@
           auto ens4
           iface ens4 inet dhcp
 
-   - path: /root/.ssh/id_rsa
-     owner: root:root
-     permissions: '0600'
-     content: |
-         -----BEGIN RSA PRIVATE KEY-----
-         MIIEogIBAAKCAQEAqdHr4zmivHPEimCuK9vtATe4PvGEr0Np/JxYDlEQsr5Cajh4
-         tajxmZrjdAnJWFXVbmYl21sN1cUW0ltxB+9+lc4GNVNCZqE4kmpsyx2lrF7xCFvF
-         Qou26JYud/UCT9IpCYgWjQIGSC8gq1TzfgOpn6rWnLNSl3WdM5TKtQT7RXIkdSUw
-         kXFbObz9lsM+ULWNozCId2osJHj4zE0D3H5odU5DpcWLuSG0MmdxtWoQNJjSiPWt
-         HbRdvNmr/xeqcAfzdUdZxGf/VbXDdiNZn9TVv7UxxBHE812KNUf/Cvb5agDfEL7x
-         i2bWXbhr4jVTaDVr6MWl8Q7fAj79gdjQnUBWaQIDAQABAoIBAFU3kU6yIna9BViH
-         UX+S2ijtRBjZ68JjavEnp4xvo5h+nydcdT57q9lv/0nAi3g3gmXm/oJH+/ZU87HV
-         zy+zP+t+umDSChUkPBZFL5jxpKyN7BhMrP1KzRuEGYd6vJE/nfY5g095P5vDgnpX
-         o+SNg/YqrY1u8zgr/hnfRaV2/XyIDEEcQXTHseWTnnMQnULFU88xL8yq8ACT5GhK
-         7A9m5ukfcU6d/fs/psz5Yqw5IQsWbv1yJ3/FKufPHlo2Nzh3/3eDAZUXvaBgf1so
-         FWFpHtkry3OXOGaZ98HgF9hL0twS0pzMvuypdGUQAt6nyB1N5re4LK/MAOddqwEc
-         1+NQzfECgYEA2ryEf0GLJdtiYs3F4HbwTwJVIXdyWv7kjYGeMkutzzAjXl6wx8aq
-         kfqLJ7x7UkR5unZ1ajEbKBciAlSuFA+Gikn6a4Lv8h87aSnHpPd/2VSitRlI/gW7
-         w4U4CL3Br1JyonU5WA7VYfTow7KnHBhdwm27RMA9uosyIpveQRpqSG0CgYEAxsAS
-         wCQKrhuPq2YtGtFR7K4BL+N+0E1Vq6h49u1ukcgUe0GHVD3VzBypNCv7rWEVHzAg
-         biCVi7PCjzZYW4fYZmzVD4JbFLVGOUu7aJwLaE4wDe72DNr6YZhcS+Ta98BP+x0q
-         Wt34JNPDabRPfhXfhiCqnWjjod+4Zqx4VJVNgG0CgYB5EXL8xJhyAbW5Hk/x56Mm
-         +BGKjoR7HS3/rMiU6hJv5SMObrbGPI3YcqZm/gn8BO6jaEGg30E6tWMbiyc270j2
-         be/vZe/NQcAuevOHuX3IGvJb7nzaLO46UBgtrmnv0mCkzuFIfh1ZNKdI+i9Ie6wZ
-         m4bVjNod0EGVqlQgELDXGQKBgB+NNmzSS++/6FrpaZesSzkrlnynvOYMoOETacCp
-         iLgT70xx5q308w/oLORfZyDrHJNK7JsPCS6YZvadRgGh2zTHajuAEj2DWZaW8zV0
-         MEtqvi44FU+NI9qCeYSC3FAgc5IF20d5nX8bLxaEzWnSxx1f6jX7BMgZ4AhMsP2c
-         hiUxAoGAFaxn+t9blIjqUiuh0smSYFhLBVPZveYHQDmQYERjktptBd3X95fGnSKh
-         iDe2iPGyud2+Yu4X/VjHLh/MRru+ZXvPXw1XwEqX93q8a1n283ul0Rl9+KKKOVHR
-         eecTjI/BfXBf33mPRKny3xuHw6uwta2T3OXky9IhqYS1kkHiZWA=
-         -----END RSA PRIVATE KEY-----
-
    - path: /root/.ssh/config
      owner: root:root
      permissions: '0600'
diff --git a/tcp_tests/templates/mk22-lab-dvr/underlay--user-data1404.yaml b/tcp_tests/templates/mk22-lab-dvr/underlay--user-data1404.yaml
index e88634a..e3a67d8 100644
--- a/tcp_tests/templates/mk22-lab-dvr/underlay--user-data1404.yaml
+++ b/tcp_tests/templates/mk22-lab-dvr/underlay--user-data1404.yaml
@@ -7,7 +7,9 @@
      sudo: ALL=(ALL) NOPASSWD:ALL
      shell: /bin/bash
      ssh_authorized_keys:
-      - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDGwjUlYn9UsmWmAGSuEA2sICad7WqxgsJR0HKcMbbxi0tn96h4Cq2iGYmzlJ48egLm5R5pxyWnFvL4b/2zb+kKTPCMwRc9nv7xEGosEFNQEoSDd+gYu2CO0dgS2bX/7m2DXmzvhqPjxWQUXXsb0OYAS1r9Es65FE8y4rLaegz8V35xfH45bTCA0W8VSKh264XtGz12hacqsttE/UvyjJTZe+/XV+xJy3WAWxe8J/MuW1VqbqNewTmpTE/LJU8i6pG4msU6+wH99UvsGAOKQOduynUHKWG3VZg5YCjpbbV/t/pfW/vHB3b3jiifQmNhulyiG/CNnSQ5BahtV/7qPsYt vagrant@cfg01
+     {% for key in config.underlay.ssh_keys %}
+      - ssh-rsa {{ key['public'] }}
+     {% endfor %}
 
   disable_root: false
   chpasswd:
diff --git a/tcp_tests/templates/mk22-lab-dvr/underlay--user-data1604.yaml b/tcp_tests/templates/mk22-lab-dvr/underlay--user-data1604.yaml
index 62e6372..09dc3df 100644
--- a/tcp_tests/templates/mk22-lab-dvr/underlay--user-data1604.yaml
+++ b/tcp_tests/templates/mk22-lab-dvr/underlay--user-data1604.yaml
@@ -7,7 +7,9 @@
      sudo: ALL=(ALL) NOPASSWD:ALL
      shell: /bin/bash
      ssh_authorized_keys:
-      - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDGwjUlYn9UsmWmAGSuEA2sICad7WqxgsJR0HKcMbbxi0tn96h4Cq2iGYmzlJ48egLm5R5pxyWnFvL4b/2zb+kKTPCMwRc9nv7xEGosEFNQEoSDd+gYu2CO0dgS2bX/7m2DXmzvhqPjxWQUXXsb0OYAS1r9Es65FE8y4rLaegz8V35xfH45bTCA0W8VSKh264XtGz12hacqsttE/UvyjJTZe+/XV+xJy3WAWxe8J/MuW1VqbqNewTmpTE/LJU8i6pG4msU6+wH99UvsGAOKQOduynUHKWG3VZg5YCjpbbV/t/pfW/vHB3b3jiifQmNhulyiG/CNnSQ5BahtV/7qPsYt vagrant@cfg01
+     {% for key in config.underlay.ssh_keys %}
+      - ssh-rsa {{ key['public'] }}
+     {% endfor %}
 
   disable_root: false
   chpasswd: