strace Docker

This all comes from this blog post.

User the strace container using the same pid and net than the target.

To strace a container named web:

$ docker run -t --pid=container:web --net=container:web --cap-add sys_admin --cap-add sys_ptrace strace

Or also simply launch an Alpine shell:

$ docker run -it --pid=container:web --net=container:web --cap-add sys_admin alpine sh