gdb does not hit any breakpoints when I run it from inside Docker container

Question

The problem

I am able to set and reach a breakpoint if I compile and run from the host, but if I do it from within the docker container gdb does not

Answer 1

Rather than elevating the entire container, I was able to use the option

--security-opt seccomp=unconfined

to fix address space randomization problems.

Some also recommend enabling the ptrace capability with

--cap-add=SYS_PTRACE

but this didn't seem to have any effect for me.

Here are the same settings for Docker compose:

security_opt:
  - seccomp:unconfined
cap_add:
  - SYS_PTRACE

Details are taken from this Stack Overflow post.