Add SYS_PTRACE capability

[Doug Garstang]

Trying to use the chef-solo provisioner with the docker builder.

The chef run list installs tomcat. Tomcat doesn't run in a docker container without adding the SYS_PTRACE capability.

See: https://github.com/docker/docker/issues/6800

How can I enable this when packer builds the docker image? There must be some way to pass custom config to docker?

Thanks,

Doug.

[Rickard von Essen]

Edit the run_command and use --cap-add. 

See:

https://docs.docker.com/engine/reference/run/#/runtime-privilege-and-linux-capabilities

https://www.packer.io/docs/builders/docker.html#run_command

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[Doug Garstang]

I'll reply to my own post:

"run_command": ["--dns={{user `dns_ip`}}", "-d", "--cap-add=SYS_PTRACE", "-i", "-t", "{{.Image}}", "/bin/bash"]

Doug