How to view Docker container application logs

docker attach command

docker attach [options] 容器will connect to the running container and then print out the container's standard input, output, and error stream information locally. There are three possible values ​​for options in the command: --detach-keys , --no-stdin , --sig-proxy .

This command just enters the container terminal and does not start a new process. So when you enter the container using multiple windows at the same time, all windows will be displayed synchronously. If one window is blocked, other windows cannot be operated on.

You can use ctrl+c to disconnect directly, but this will cause the container to exit and stop . If you want the container to continue running when you detach from the container terminal. You need to use the --sig-proxy parameter. For example:

$ docker attach --sig-proxy=false mytest

Note: When using docker attach to connect to the container's standard input and output, docker uses a memory buffer of approximately 1MB to maximize the throughput of your application. If this buffer fills up, the speed of output or writing will be affected. Therefore, to view the application logs, you can use the docker logs command.

docker logs command

docker logs [options] 容器Gets the container's logs.

For example, print the last 10 lines of the mytest application in the container.

$ docker logs --tail="10" mytest

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