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

Hello,
I invested a lot of time in this error in a fresh install of appwrite 1.8.1 and lasted until fix, this if for helping anyone that can have the same weird problem

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.