Beginner's tips for Rancher


I would like to introduce some tips for Rancher’s beginner.

🏀 Add cron configuration

If you want Rancher to run script regularly:

  • (1) Launch a stack for cron Rancher Cron Service
  • (2) Add setting(label) for corn in docker-compose.yml

Launch a stack for cron

Launch a stack for cron Rancher Cron Service.
Even if there are multiple hosts, we will take care of them collectively, so only one is fine.

docker-compose.rancher-cron.yml is as follows:

version: '3.5'
services:
  rancher-cron:
    labels:
      io.rancher.container.create_agent: 'true'
      io.rancher.container.agent.role: environment
    image: socialengine/rancher-cron:0.2.0

rancher-compose.yml is as follows:

version: '2'
services:
  app:
    scale: 1
    start_on_create: true

After creating the above files, you can start the cron stack on Rancher with the following command.

rancher up -d --pull --force-upgrade --recreate --stack rancher-cron --file ./conf/docker-compose.rancher-cron.yml --rancher-file ./conf/rancher-compose.yml

Add setting(label) for corn in docker-compose.yml

あとは実際にcronで定期的に実行したいスクリプトにcom.socialengine.rancher-cron.schedule: 0 */15 * * * *といったラベルを追加しておきます。

Add a label such as com.socialengine.rancher-cron.schedule: 0 * / 15 * * * * to your docker-compose.yml for service.

docker-compose.some-script.yml is as follows:

version: '3.5'
services:
  app:
    image: some-docker-image:latest
    command: '/script/to/do_something.sh'
    working_dir: "/app"
    tty: true
    stdin_open: true
    labels:
      com.socialengine.rancher-cron.schedule: 0 */15 * * * *
      io.rancher.container.start_once: 'true'

rancher-compose.yml is as follows:

version: '2'
services:
  app:
    scale: 1
    start_on_create: true

After creating the above files, you can start the cron stack on Rancher with the following command.

rancher rm --stop some-script
rancher up -d --pull --force-upgrade --recreate --stack rsome-script --file ./conf/docker-compose.some-script.yml --rancher-file ./conf/rancher-compose.yml

🗽 References

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