freepenguins/docker-freeswitch

Freeswitch Dockerized for Kubernetes

Freeswitch SIP Switch

Freeswitch, for use in a kubernetes pod.

Issues

1. Kubernetes Pod hostname's do not reflect it's PodIP assigned DNS.

The hack I've done to work around this requires root privileges at runtime, effectively breaking the ability to set a non root user in the dockerfile. USER freeswitch has been commented out in the dockerfile for this reason.

Docker by design does not allow you to change the hostname of a container after creation. It also manages the /etc/hosts file, which means chown's in the docker build process are set back to root again when a container is created.

EPMD requires that the environment variable: HOSTNAME and the executable: env hostname return a correct and resolvable hostname.

I've fixed this by creating a dummy hostname bash script and place it at the beginning of the path: '/opt/bigcouch/bin/hostname-fix'. In the entrypoint script, if KUBERNETES_HOSTNAME_FIX is set, this script is linked at runtime to '/opt/bigcouch/sbin/hostname', and the environment variable HOSTNAME is set correctly, as well as creating an entry in /etc/hosts.

Only the root user can modify /etc/hosts in a docker container because ownership changes in the build process aren't persisted during container initialization.

If anyone knows of a better way to do this, please submit a pull request with a short explanation of the process you used.

-Joe