How to view GitLab's logs on CentOS

On CentOS systems, there are many ways to view GitLab logs. This article will introduce in detail how to use gitlab-ctl and journalctl commands to efficiently view and analyze GitLab logs, helping administrators quickly locate and resolve problems.

View GitLab logs in real time (using gitlab-ctl )

gitlab-ctl command line tool provided by GitLab is a powerful tool for managing GitLab services. Use the following command to view the log in real time:

• View all logs: sudo gitlab-ctl tail This command displays real-time log output for all GitLab services.

• View specific service logs: sudo gitlab-ctl tail gitlab-rails This will only display the real-time logs of the gitlab-rails service. You can replace gitlab-rails with other service names, such as nginx , sidekiq , etc., to view the logs of the corresponding service.

• View the specified log file: sudo gitlab-ctl tail nginx/gitlab_error.log This command is used to view specific log files, such as Nginx's error log.

Analyze GitLab exception logs

GitLab's exception log is crucial for troubleshooting system problems. You can view and analyze exception logs in the following ways:

• View the production environment JSON log: sudo cat /var/log/gitlab/gitlab-rails/production_json.log This command displays the entire contents of the production_json.log file, which records the detailed running information of the GitLab Rails application, including error information.

• Use the grep command to find specific errors: sudo cat /var/log/gitlab/gitlab-rails/production_json.log | grep "error message" Use the grep command to quickly find log lines containing specific keywords (such as "error message") to facilitate the positioning of problems. Please replace "error message" with the error message you want to find.

Other important log files

In addition to the above logs, GitLab also generates other important log files:

• gitlab-shell log: /var/log/gitlab/gitlab-shell/gitlab-shell.log records the process of Git command request processing.

• Unicorn logs: /var/log/gitlab/unicorn/unicorn_stdout.log records the standard output log of the GitLab Rails application server.

Use journalctl to view system logs (for systemd system)

If your GitLab service is managed by systemd, you can use the journalctl command to view more comprehensive system logs:

• View all GitLab-related system logs: sudo journalctl -u gitlab

• View the system log of the GitLab service in real time: the sudo journalctl -u gitlab -f -f option will continuously display new log entries.

Through the above methods, you can comprehensively monitor and manage GitLab's log information on CentOS, thus effectively troubleshooting and system maintenance. Please select the appropriate method to view the log according to the actual situation.

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