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Configuration variables in clusters

In order to have diferent configuration variables in each cluster host with the same isardvdi.cfg for all hosts we have two systems:

• /opt/isard-local/environment is a file that loads variables at shell loading time. Therefore this variable content prevail over isardvdi.cfg variables, because the shell is loaded after docker-compose. These variable contents are loaded running the system using docker-compose and pcs.

  • sh -i loads $ENV file

    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/docker/hypervisor/src/start.sh#L1
    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/docker/_common/haproxy-docker-entrypoint.sh#L1

  • Export ENV environment variable

    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/docker-compose-parts/hypervisor.yml#L24
    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/docker-compose-parts/video.yml#L26
    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/docker-compose-parts/monitor-proxy.yml#L24

  • Mount /opt/isard-local/environment to /usr/local/etc/environment

    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/docker-compose-parts/hypervisor.yml#L18
    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/docker-compose-parts/video.yml#L24
    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/docker-compose-parts/monitor-proxy.yml#L22

• /opt/isard/config/ can content files that are loaded by pcs compose resource before run docker-compose. Therefore this variable content prevail over isardvdi.cfg. These variable contents are not loaded using docker-compose without pcs.

  • evaluate_env function at compose pcs resource
    • https://gitlab.com/isard/isardvdi/-/blob/38b6c520/sysadm/compose#L375

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Last update: April 19, 2023