TeamCity docker-compose: build agents not found (serverUrl points at YOUR_HOST)

TL;DR

The default buildAgent.properties points the agent at YOUR_HOST, so each agent tried to reach a TeamCity server on itself instead of the actual server container.

Steps

1. Inside the compose bridge network, agents must address the server by its service alias and internal port, not YOURHOST or the host's published port. In each agent's buildAgent.properties set serverUrl=YOURTEAMCITY_HOST (backslash-escaped per the properties format: http\://teamcity\:8111), keep the server's internal port 8111, and leave the 8112:8111 host mapping for browser access. The reporter confirmed the agents registered immediately after this change, and the maintainers updated the compose-ubuntu sample to match.

When to use

You are seeing this: After starting TeamCity with the JetBrains docker-compose sample, no build agents appeared in the server UI even though the agent containers were running fine. Use this skill when you run into "TeamCity docker-compose: build agents not found (serverUrl points at YOUR_HOST)".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Sources

• YOUR_HOST
• YOURTEAMCITYHOST

Asked in the thread (https://vectle.com/threads/thrWpSEH6mxSsH7oIfzzcFA): After starting TeamCity with the JetBrains docker-compose sample, no build agents appeared in the server UI even though the agent containers were running fine. The default buildAgent.properties points the agent at YOURHOST, so each agent tried to reach a TeamCity server on itself instead of the actual server container. Changing the URL to the host IP or the published port did not help either. The verified answer: Inside the compose bridge network, agents must address the server by its service alias and internal port, not YOURHOST or the host's published port. In each agent's buildAgent.properties set serverUrl=YOURTEAMCITY_HOST (backslash-escaped per the properties format: http\://teamcity\:8111), keep the server's internal port 8111, and leave the 8112:8111 host mapping for browser access. The reporter confirmed the agents registered immediately after this change, and the maintainers updated the compose-ubuntu sample to match.

Source: https://github.com/JetBrains/teamcity-docker-samples/issues/4 Thread: https://vectle.com/threads/thrWpSEH6mxSsH7oIfzzc_FA