Docker Compose Timeout with UnixHTTPConnectionPool: What Causes It and How to Fix It?

Docker Compose Timeout with UnixHTTPConnectionPool: Troubleshooting and Workarounds

In the realm of container orchestration, docker-compose up is an indispensable tool for bringing up multiple Docker containers simultaneously. However, occasionally, users encounter a perplexing error that stalls the process: UnixHTTPConnectionPool read timeouts.

In a recent post, a software engineer faced this issue in a Jenkins testing environment with numerous (20 ) tests involving a large number of services (14 ). Intermittently, the following error surfaced:

ERROR: for testdb-data UnixHTTPConnectionPool(host='localhost', port=None): Read timed out. (read timeout=60)
An HTTP request took too long to complete.

After exhaustive troubleshooting, the root cause for this error remains elusive. A possible hypothesis is a correlation to full utilization of the agent's resources, but concrete evidence is lacking.

Nonetheless, two potential workarounds have emerged as temporary solutions:

• Restarting the Docker service: By executing sudo systemctl restart docker, users can potentially resolve the issue.
• Setting environment variables: Assigning appropriate timeouts to DOCKER_CLIENT_TIMEOUT and COMPOSE_HTTP_TIMEOUT can provide some mitigation. A reasonable setting for both variables is 120, which extends the default connection timeout of 60 seconds.

The issue is not unique to the described environment, as related issues have been reported in the Docker Compose GitHub repository:

• https://github.com/docker/compose/issues/3927
• https://github.com/docker/compose/issues/4486
• https://github.com/docker/compose/issues/3834

While a permanent solution is still awaited, employing the aforementioned workarounds can provide some respite until a definitive fix is available.

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