this post was submitted on 30 Jun 2023
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How to trigger a container restart based on successful update/image change of another container? (lemmy.world)
submitted 1 year ago by gobbling871@lemmy.world to c/selfhosted@lemmy.world
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Basically have watchtower monitor and update containers whenever new images are released. I've recently noticed that with searxng (using redis as db), hosted through nginx proxy manager, will have a steady downtime of about 15mins post update then come back online.

This is extremely frequent for searxng's case as I have watchtower run every day and my preferred way of running most of my containers is with the latest tag. The way out of this downtime in my experience is a restart of NPM which brings back the searxng service.

I'm looking for a way to automate a restart of the NPM container after a successful update of searxng's container.

I have checked the docs for watchtower, and the lifecycle hooks (a way to run sh scripts pre/post update) are able to run only from the applied container and not from the host system.

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[–] chiisana@lemmy.chiisana.net 2 points 1 year ago (1 children)

Sounds like trying to use a rolled up newspaper to kill a fly. You can do it with janky restarts of your reverse proxy container, which results in down time of all apps, or you’d wait some long period of time for it to detect the change and rewire itself.

I’d recommend reaching for an electric bug slapper instead. Use something like traefik, where you can allow it to connect to your docker socket (just like watchtower), and automatically wire up the new container’s reverse proxy when it comes back online.

[–] gobbling871@lemmy.world 0 points 1 year ago (1 children)

Sounds like trying to use a rolled up newspaper to kill a fly.

Isn't this what tech/sysadmin solutions are all about now? 😆

You can do it with janky restarts of your reverse proxy container, which results in down time of all apps

Yet to see if this solution breaks up my other services but it currently fixes the downtime I've recently been having with the searxng docker + NPM setup.

Use something like traefik, where you can allow it to connect to your docker socket (just like watchtower), and automatically wire up the new container’s reverse proxy when it comes back online.

NPM covers most of my needs plus traefik doesn't work for me (due to other reasons unrelated to the tech).

[–] chiisana@lemmy.chiisana.net 1 points 1 year ago

Yeah. We reach for what works, and sometimes they’re great, other times there may be better solutions. When a reverse proxy container restarts, there will be a brief disconnect/outage of everything it is proxying until it comes back. I think I’m this case there are other solutions available, but I trust you’ve also weighted the pros and cons of your decision. Hope you find the right tool that meets your objectives!

[–] GentleWay@lemmy.world 0 points 1 year ago (1 children)

Not sure if this will work in your use case but I use OliveTin for automating docket commands. Link here https://github.com/OliveTin/OliveTin

[–] gobbling871@lemmy.world 0 points 1 year ago

Doesn't. Not automated.

[–] ChrislyBear@lemmy.world 0 points 1 year ago (1 children)

Either use depends_on or think of a health check and use Will Farrell's simple Docker Autoheal container that restarts containers when they become unhealthy. https://github.com/willfarrell/docker-autoheal

[–] gobbling871@lemmy.world -1 points 1 year ago (1 children)

Doesn't seem like this will do what I want.

[–] ChrislyBear@lemmy.world 0 points 1 year ago (1 children)

This will do exactly what you want: You have to configure a healthcheck for searnxg that detects when it's down. Maybe something with curl or whatever.

As soon as it's down autoheal will restart the container. Doesn't matter why it is down (update, dependency not running, ...) autoheal will just restart the container.

[–] gobbling871@lemmy.world -1 points 1 year ago (1 children)

I want to restart the NPM container (when the searxng service goes down) instead of searxng.

[–] ChrislyBear@lemmy.world 0 points 1 year ago (1 children)

Ahhhh.... alright, I misunderstood. So either depends_on is your friend or you could implement a rather dirty solution: Write a little script for the NPM healthcheck that also checks if searxng is online. Then use autoheal.

But that would be my last solution and only if the searxng is very closely depending on the npm container.

[–] gobbling871@lemmy.world 0 points 1 year ago

No worries. I ended up writing a systemd service that restarts the npm container a minute after the watchtower runs. I don't know why I didn't think of that earlier but I guess it's a much simpler solution than using depends_on with npm which hosts a lot of my other services.