When the HAProxy process running inside a Docker container is unable to set up the PID (Process ID) file required in its configuration, the error “HAProxy Docker cannot create pidfile /var/run/haproxy.pid” is shown. At Bobcares, with our Docker Hosting Support Service, we can handle your issues.

Fixing “HAProxy Docker cannot create pidfile /var/run/haproxy.pid” Error

We can run the following steps to fix the error:

1. Check the rights on the filesystem inside the Docker container. Higher permissions may be needed for the directory /var/run/ in order for HAProxy to create the PID file. Verify that the container is allowed to write to this directory.

2. Check that the Docker container’s /var/run/ directory does not already include a file with the name haproxy.pid. If such a file is present, it may be a sign that the container is already hosting another instance or that the file was not completely erased during an earlier run.

3. Confirm that the path where HAProxy is trying to create the PID file matches the one given for the PID file in the config. Because HAProxy won’t be able to build the PID file if the path is invalid.

4. Check the container environment for any limitations preventing HAProxy from creating files in specific directories.

5. Make sure that the directory specific to the PID file exists on the host system and has the necessary rights before using volumes to mount host directories inside the container. Volume mounts may also restrict the amount of access that containers have to host directories.

6. Make sure that the PID file directive’s setup is correct by looking over the HAProxy config file. Also, verify the path’s validity and HAProxy’s ability to create files.

7. Make careful not to accidentally change the PID file path or any other relevant settings when starting the container with a custom Docker run code.

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Conclusion

To conclude, the article offers the troubleshooting steps from our Tech team to fix the error “HAProxy Docker cannot create pidfile /var/run/haproxy.pid.”