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dockerlogginggreptail

Tail and grep docker logs

How can I both tail and grep Docker logs? I've tried the following:

sudo docker logs -f my_container | grep foo

This should tail all lines with foo from the container's logs, but instead shows everything.

Solution

  • Here's what I did:

    sudo docker logs -f my_container &> log.log & tail -f log.log | grep foo

    docker logs -f my_container &> log.log tails all the containers logs while also outputting to file log.log. In parallel, which is what the & by itself does, tail -f log.log | grep foo tails that file and greps, which a common way to grep tailed output.

    The downside is that file log.log is created, but there was no other way to do this.