hup-on-notify

hup-on-notify

This binary watches -fileToWatch and sends a SIGHUP to the process id (PID) found in -pidFile

build for linux and docker

make

notes

The included Dockerfile is a POC on how to send a SIGHUP to squid-cache when it's configuration changes.

To demonstrate:

1. build for linux and docker (above).
2. run the new container: docker run -ti -p 3128:3128 hup-on-notify-example
3. in a separate terminal, run the golang binary in the squid container: docker exec -ti $(docker ps | grep hup-on-notify-example | awk '{print $1}') /usr/local/bin/hup-on-notify
4. in a separate terminal, edit the squid.conf: docker exec -ti $(docker ps | grep hup-on-notify-example | awk '{print $1}') vi /etc/squid/squid.conf and save changes.

You should see squid reload.

stupid docker tricks

1. bind mount the squid.conf to /etc/squid/squid.conf

stupid k8s tricks

1. run the golang binary as an additional container in the same pod as the process in question. mount the -fileToWatch as a volume from a ConfigMap. watch your process in question receive a SIGHUP when the ConfigMap object changes.