How to Fix 'UnixHTTPConnectionPool' Timeouts when Running Docker-Compose Up?

Resolve Docker-Compose Timeout with UnixHTTPConnectionPool

In the realm of continuous integration, where pipelines orchestrate tests on Jenkins agents, the occasional hiccup can arise. One such issue encountered is the frustrating "UnixHTTPConnectionPool" timeout when running docker-compose up.

Upon investigation, it was discovered that the error often occurred during setup, which involved spinning up a plethora of containers via docker-compose. Moreover, the symptom appeared sporadic, and a pattern linking it to system resources was yet to be established.

After meticulous debugging, two workarounds emerged that effectively addressed the problem: restarting the docker service (sudo systemctl restart docker) and configuring the DOCKER_CLIENT_TIMEOUT and COMPOSE_HTTP_TIMEOUT environment variables (export DOCKER_CLIENT_TIMEOUT=120; export COMPOSE_HTTP_TIMEOUT=120).

Referencing relevant GitHub issues (https://github.com/docker/compose/issues/3927, https://github.com/docker/compose/issues/4486, https://github.com/docker/compose/issues/3834) shed light on the underlying cause. These issues point to potential race conditions and communication issues between Docker clients and servers.

By extending the timeout parameters, ample time is granted for the connection to establish, thus mitigating the dreaded "UnixHTTPConnectionPool" timeout and ensuring the smooth execution of test pipelines.

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