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Downtime of Elixir app

#deployment#troubleshooting
silviurosu

silviurosu

Downtime of Elixir app

I have an Elixir production app deployed with Coolify on a big Hetzner server.
Most of the time the app works fine but there are a few minutes of downtime that happen almost daily (1-2 times a day only) when my app becomes unresponsive, most of the time the downtime is around 2 minutes.
The server CPU and memory never goes more than 25-30% so it’s not because of not enough resources.
As you can see in this Grafana snapshot there are some gaps where prometheus is not able to reach the app to collect metrics.

image
image1200×914 50 KB

I tried to watch for server restarts, read Coolify logs but I could not find any clue. Did you guys have any similar issue? How would you debug this further?
I would not want to switch to a cluster deployment and complicate things.

5 comments
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NobbZ

NobbZ

Network switch daily reboot?

If you ssh into the hosting machine or even the docker container, will that connection persist or go down? Can you trace during that time? Are other services in the same datacenter also affected?

3
Post #4
Hermanverschooten

Hermanverschooten

I had something like that a couple of years back, turned out to be backups freezing my instance.

3
Post #6
bgr11n

bgr11n

You sure there was a downtime?

To be honest looks like there is no datapoints on graph for that time.

1
Post #2
silviurosu

silviurosu

There are no datapoints since the server is not responding.
Neither the app is not accessible during this time, all the endpoints are down.

For more details the app deployed as a docker image with Traefik in front for domain and htts certificate.

I am excluding Erlang VM as the culprint so the only things I can think of are:

  • server restarts
  • networking issue
  • traefik proxy not being able to forward the requests

What else can it be?

1
Post #3

Where Next?

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