Monitor file system events to restart service on every configuration change.
Fix multipath daemon error about missing path when using VirtualBox.
varnishlog to log specific Varnish requests.
Varnish Shared memory Log can put a major strain on the disk (I/O write operations). The solution is to store it on the virtual memory filesystem.
Configure systemd service to be restarted in case of failure.
needrestart utility to determine which services need to be restarted after the upgrade.
Use Filebeat to deal with many small log files.
Define custom Nginx log format to store SSL cipher and protocol information.
Use FUSE (filesystem in userspace) to access rdiff-backup repository.
Use HAProxy with Lua to enforce dynamically generated passwords for basic authentication.