If you confirm that gitlab has been started and the status is run

Log in to the website and report an error.

The first consideration is configuration,

Gitlab requires more than 4G memory. If not, please check whether the virtual machine or server configuration is enough.

Second, check whether your port is occupied

netstat -lntup

If port 8080 is occupied, you must kill it

You can query the log through gitlab CTL tail to see where the problem is