ReloadConf

Simple process manager. Reloadconf is a front-end for arbitrary commands. It will watch a directory for configuration files and optionally run a command to test those configuration files. When the configuration is valid a command (daemon) is executed. Whenever new configuration files are detected this procedure is repeated.

Here is an example usage for nginx.

$ reloadconf --config=/etc/nginx/nginx.conf --command="nginx -g nodaemon: true" --test="nginx -t" --watch=/tmp/nginx

First of all, if /etc/nginx/nginx.conf exists, it will be verified using nginx -t and if successful, nginx will be started. In either case reloadconf will then proceed to watch /tmp/nginx for a file name nginx.conf. If present, that fill will be tested, and a if successful a HUP signal will be sent to nginx (or nginx will be started).

Docker

ReloadConf is generally useful whenever you want a process to recieve a HUP signal after new configuration is written. It was written to be used with docker where one container generates a config file for a process in another container. To use it for this purpose, simply install then utilize reloadconf in your Dockerfile.

# Install reloadconf.
RUN pip install reloadconf

# Map a volume into the container.
VOLUME /mnt/data/nginx/:/conf/

# Watch for another container to modify the conf and reload nginx.
CMD reloadconf --command="nginx -c /conf/nginx.conf -g'nodaemon: true;'" --watch=/conf/in --test="nginx -c /conf/nginx.conf -t" --config=/conf/nginx.conf