CODEWITHSUNDEEP
javascriptnode.jsnginxdockerdocker-compose
AndrewMcLagan
AndrewMcLagan

Reputation: 13987

Monitoring node processes within docker containers

I have a docker-compose file that creates 3 Node-js containers and an Nginx container as a forward proxy to load balance.

How can I monitor and restart the Node-js containers when and if they fail?

Traditional wisdom states all containers should only have a single proccess. So running systemd (or similar) on the node containers would break that pattern.

__--== UPDATE ==--__

As @mishunika stated below, if the node process fails with a correct exit code and there are correct restart policies on the container, it will restart.

Upvotes: 1

Views: 937

Answers (1)

mishunika
mishunika

Reputation: 1916

First of all, it really depends in what circumstances a node.js container may fail, and if it does so, the container should probably stop and return an exit status code.

As of docker 1.2, there are so-called restart policies. I suppose that a failing node instance may stop the container and return a non-zero. In that case you can specify the on-failure policy at the container level.

In compose you can specify it by:

container_name:
    build: .
    ...
    restart: on-failure

Upvotes: 1

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