diff --git a/tcp_tests/templates/mk22-lab-basic/underlay--user-data-cfg01.yaml b/tcp_tests/templates/mk22-lab-basic/underlay--user-data-cfg01.yaml
index c90e6ad..6634617 100644
--- a/tcp_tests/templates/mk22-lab-basic/underlay--user-data-cfg01.yaml
+++ b/tcp_tests/templates/mk22-lab-basic/underlay--user-data-cfg01.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:
@@ -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-----
-         MIIEpAIBAAKCAQEAxsI1JWJ/VLJlpgBkrhANrCAmne1qsYLCUdBynDG28YtLZ/eo
-         eAqtohmJs5SePHoC5uUeacclpxby+G/9s2/pCkzwjMEXPZ7+8RBqLBBTUBKEg3fo
-         GLtgjtHYEtm1/+5tg15s74aj48VkFF17G9DmAEta/RLOuRRPMuKy2noM/Fd+cXx+
-         OW0wgNFvFUioduuF7Rs9doWnKrLbRP1L8oyU2Xvv11fsSct1gFsXvCfzLltVam6j
-         XsE5qUxPyyVPIuqRuJrFOvsB/fVL7BgDikDnbsp1Bylht1WYOWAo6W21f7f6X1v7
-         xwd2944on0JjYbpcohvwjZ0kOQWobVf+6j7GLQIDAQABAoIBAF0tAAMlmLGY7CQU
-         /R3IctBlRhU1DpZmyTfXc1MbzzqO5Wu44yZbQyjBthcUrdWGEUQy1r4Z2OHq1T54
-         KcPry6DDjuU9Q+rkVXmnC07a3GOmOq7zEEA/3zU01ImJvFNdb8NtCb6ELOKDT7Zo
-         WGUi2h/7M41+OqDzD2m4csYO/3Vvr12sMhn9BfwU4OPpL44A4PJiEryEAw9o5/j/
-         73eyPvgf6tkC4l0mMtfHB9tg/F++iH8fiEr1SMvHGIc9gZNmFYMrs2XfLkAejPfH
-         XrOyw6eqd+kluqw51gHhdeQYwBx6mfOkbhPHWU79FzpH5M1ikdfImZmPCxVf3Ykj
-         nxLoK9UCgYEA4c9agPb/OFyN00nnUMBxzQt1pErpOf/7QhnvNZThomzSV7PyefxF
-         H6G/VlS3gCcrWBCh7mqOSxGcNQwgudVqzUm7QXruQeg4nWcCGSxg7lGYSEf0MyWL
-         5wrd+f9MoV/VV8udIPENjp96o5kwQEVRfsTBNwmk54kup2+br5q8re8CgYEA4VT8
-         UeIN+plP6FjZYITI+SO/ou5goKIhfBrqa5gOXXPc2y6sIu9wBWCr+T7FAF/2gGhS
-         rpVx76zcmx05nwkxIlJh58+G3MVyUDFoWnrtL38vdkBSuOGgNfzcBsFpQvFs8WaW
-         otbuTtkPcXbVdYRr32/C620MxXhUO+svo3CLaaMCgYEA1rjlF8NHl+Gy31rkQg5t
-         aIxgFpVBR+zZkNa2d94V3Ozb65fqmALB/D1Dg6VVROB6P+i5AsyCeHHLd0oMCIof
-         YAyfqrlpvHRE+bAM98ESfyxJwVnipYwrh8z2nZYd2UoWxcCRrtRpjtipts2ha0w/
-         HWudS2e5To5NNdxUT9y1VDMCgYEAxkQiE+ZkyGiXv+hVtLCBqX4EA9fdm9msvudr
-         9qn/kcj9vrntanvlxEWQbCoH61GEsu2YOtdyPiKKpc1sQvwyiHGWhgK7NoxhDiC7
-         IknhYxZ064ajgtu8PWS1MRiDhwypACt1Rej6HNSu2vZl0hZnWF2dU8tLHoHHFEXX
-         T+caNCMCgYBZpD6XBiiEXf0ikXYnXKOmbsyVG80V+yqfLo85qb2RW9TaviOSP43g
-         nB22ReMSHq2cOrs6VTTgfhxefBwzdDFbfKMf6ZU82jCNlpetAZOrhdMHUvcsjSQk
-         XKI6Ldfq6TU3xKujRHfGP+oQ6GLwVCL/kjGxOuSRLFGfRiiqYI3nww==
-         -----END RSA PRIVATE KEY-----
-
    - path: /root/.ssh/config
      owner: root:root
      permissions: '0600'
diff --git a/tcp_tests/templates/mk22-lab-basic/underlay--user-data1404.yaml b/tcp_tests/templates/mk22-lab-basic/underlay--user-data1404.yaml
index faadbb5..60c33c8 100644
--- a/tcp_tests/templates/mk22-lab-basic/underlay--user-data1404.yaml
+++ b/tcp_tests/templates/mk22-lab-basic/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-basic/underlay--user-data1604.yaml b/tcp_tests/templates/mk22-lab-basic/underlay--user-data1604.yaml
index ff6539a..b1c2dc0 100644
--- a/tcp_tests/templates/mk22-lab-basic/underlay--user-data1604.yaml
+++ b/tcp_tests/templates/mk22-lab-basic/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: