The Gitlab self-hosted application uses HTTP by default. You can enable HTTPS by performing a couple of steps. You need to acquire an SSL certificate and corresponding key for a domain that is under your control, and tell Gitlab that it needs to use these resources.
Create a directory which will hold the certificate and key:
mkdir -p /etc/gitlab/ssl chmod 0700 /etc/gitlab/ssl
Copy your certificate file (either .crt or .pem) and key file into this directory:
cp example.net.pem example.net.key /etc/gitlab/ssl chmod 0600 /etc/gitlab/ssl/example.net.*
Edit the file /etc/gitlab/gitlab.rb:
external_url 'https://gitlab.example.net:8443’ nginx['ssl_certificate'] = "/etc/gitlab/ssl/example.net.pem" nginx['ssl_certificate_key'] = "/etc/gitlab/ssl/example.net.key"
Reconfigure Gitlab to apply the changes: