Run ruby program as daemon

Taken from " Daemon Processes in Ruby. This is a module to daemonize your code. Here's an offshoot that wraps an existing script. Essentially it boils down to this from Travis Whitton's Daemonize.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Make a Ruby program a daemon? Ask Question. Asked 11 years, 4 months ago. Active 3 years, 1 month ago. Viewed 22k times. Can someone point me in the right direction on how this would be done?

Improve this question. Add a comment. Active Oldest Votes. Ruby 1. No problem. Your OS provides a system to let you run normal programs in the background. On ubuntu, this is accomplished via Upstart of systemd. On OSX it's launchd. There are others. But they all work according to the same concept. You provide a configuration file telling the system how to start and stop the long-running program. Well, because fun! And we'll learn some interesting facts about Unix processes along the way.

Now that you've been told to never make a daemon, let's make some daemons! As of Ruby 1. All you have to do is use the Process. Now, when I run this script, control passes back to the console. If I tail my log, I can see that the timestamp is being added every second, just like I expected.

So that was easy. But it still doesn't explain how daemons work. To really understand that, we need to do the daemonization manually. If you use bash to run a normal program, that program's process is a child of bash. But with daemons, it doesn't matter how you launch them.

Their parent process is always the "root" process provided by the OS. You can tell this by looking at the daemon's parent id. A daemon's parent id is always 1. In the example below we use pstree to show this:. Layout: suppose you have some code you want to run in the background and control that background process from a script:. For testing purposes you can even run myproc. When daemonizing a process using a wrapper script, as examples 1 and 2 above, the status can be shown using.

By default this will display whether or not the daemon is running and, if it is, its PID. Skip to content. Star Ruby daemons gem official repository MIT License. Branches Tags. Could not load branches. Could not load tags. Latest commit.