Internal curl errors has occurred within the executor! Error Number: 6. Error Msg: Could not resolve

Hey I get this error when I wanna execute a function:
Internal curl errors has occurred within the executor! Error Number: 6. Error Msg: Could not resolve host: 67d18e5c63566
Error Code: 500

I restarted everything... (docker compose up/down)
I totally reinstalled everything event removed the volumes
did Linux updates (ubuntu)
restarted the server

Nothing I did not get any other error codes...

in docker logs appwrite I get this:
[Job] (67d191f0b89c67.80953153) failed to run.
[Job] (67d191f0b89c67.80953153) Internal curl errors has occurred within the executor! Error Number: 6. Error Msg: Could not resolve host: 67d191f0bab48
[Error] Type: Exception
[Error] Message: Internal curl errors has occurred within the executor! Error Number: 6. Error Msg: Could not resolve host: 67d191f0bab48
[Error] File: /usr/src/code/src/Appwrite/Platform/Workers/Functions.php
[Error] Line: 615

[SOLVED] curl error Number: 6 — functions never execute on self-hosted Appwrite

Symptom
All Cloud Functions fail silently with:

Functions show Failed in console. Logs tab is completely empty. The function never starts.

Root cause
The host VPS /etc/resolv.conf contains search invalid (injected by systemd-resolved on some VPS providers). Docker inherits this and injects it into every container's DNS config.

When the executor spawns a runtime container and tries to contact it via its random hex hostname (e.g. a12924175ffd597e), Docker DNS resolves it as a12924175ffd597e.invalid → SERVFAIL → curl error 6 (CURLE_COULDNT_RESOLVE_HOST).

Confirm

# On the host
cat /etc/resolv.conf | grep search
# If you see "search invalid" → that's your problem

# Inside the executor
docker exec openruntimes-executor cat /etc/resolv.conf | grep search
# Also shows "search invalid"

Fix

# Fix the host resolv.conf
sed -i 's/search invalid/search ./' /etc/resolv.conf

# Restart executor to inherit the new DNS config
cd ~/appwrite && docker compose restart openruntimes-executor

Verify

# Should now show "search ." 
docker exec openruntimes-executor cat /etc/resolv.conf | grep search

# Trigger any function → should return 200 with logs

Affects fresh Appwrite 1.8.x installs on VPS providers where systemd-resolved sets search invalid by default (confirmed on Contabo). Deployment works fine, only execution fails. No explicit error in app logs.

Is this AI reply? 😅

I told AI to format the steps to be more clear ( im not english native speaker so... 😄 ) I want to set also the 12 pathways we tried to find the problem and the origin, but it will polute the post ^^ I prefer like that, easy to read and to test 😉