CMG Linux VM

Introduction

CMG Linux is utilized as a DB VM as one of Nokia MAG-C VMs. The image of CMG Linux is released in qcow2 format. Since some of MAG-C tools in CMG Linux are written with systemd or systemctl utilization, then CMG Linux cannot be containerized because docker does not run systemd inside the container. Given this reasoning, the approach to containerized CMG Linux is to create a container to run a CMG Linux VM in the same way Vrnetlab has done.

Build the docker image

It is required to provide CMG Linux qcow2 image to build the docker image. Nokia representative can provide the qcow2 file.

Make sure that your python virtualenv has yaml package installed.

Copy the cmg-linux.qcow2 file in vrnetlab/cmglinux directory and rename the file by appending the version to it. For example, for CMG Linux version 24.3.r1, make sure that the qcow2 file will be named as cmg-linux-24.3.R1.qcow2. The version 24.3.R1 will be used as a container image tag.

Run make docker-image to start the build process. The resulting image is called vrnetlab/cmglinux:<version>. You can tag it with something else. for example, cmglinux:<version>.

Host requirements

• 4 vCPU
• 6 GB RAM

Configuration

Initial config is carried out via cloud-init. By default CMG-Linux boots by using a pre-defined cloud-init config drive.

Custom configuration can be added by binding the local config_drive directory to /config_drive directory in the container. The accepted structure of config_driveis shown below. Any other directories or files not specified below are ignored.

config_drive/
└── openstack/
    ├── latest/
    │   ├── meta_data.json
    │   └── user_data
    └── content/
        ├── 0000 (referenced content files)
        ├── 0001
        └── ....

The internal launch.py script also modifies the content of user_data to add clabas default user with password clab@123. Moreover, it also modifies user_data to configure the management network interface.

Also 9.9.9.9 configured as the DNS resolver. Change it with resolvectl if required.

Example containerlab topology

Below is an example of Containerlab topology using CMG Linux.

name: test_cmglinux
prefix: __lab-name
topology:
  nodes:
    cmg-1:
      kind: generic_vm
      image: vrnetlab/vr-cmglinux:24.3.R3
      binds:
        - config_drive_cmg1:/config_drive
    cmg-2:
      kind: generic_vm
      image: vrnetlab/vr-cmglinux:24.3.R1
      binds:
        - config_drive_cmg2:/config_drive
    alpine:
      kind: linux
      image: alpine:dev
  links:
  - endpoints:
      - cmg-1:eth1
      - alpine:eth1
  - endpoints:
      - cmg-1:eth2
      - alpine:eth2
  - endpoints:
      - cmg-1:eth3
      - alpine:eth3
  - endpoints:
      - cmg-2:eth1
      - alpine:eth4
  - endpoints:
      - cmg-2:eth2
      - alpine:eth5