Connect Jenkins and GitLab

In this video I explain how to connect Jenkins and GitLab.

Tutorial

Go to GitLab website and copy the URL. In my case it is 10.10.0.119
Login via SSH to Jenkins server and copy the certificate from GitLab

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</dev/null openssl s_client -connect 10.10.0.119:443 -servername 10.10.0.119 | openssl x509 > $HOME/10.10.0.119.crt

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sudo find / -iname "cacerts"

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java -version

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sudo find / -iname "keytool"

Import GitLab certificate to Java cacerts

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# Import GitLab certificate
sudo /usr/lib64/jvm/java-11-openjdk-11/bin/keytool -import -file /home/adrian/10.10.0.119.crt -alias gitlab -keystore /usr/lib64/jvm/java-11-openjdk-11/lib/security/cacerts

# Delete GitLab certificate
sudo /usr/lib64/jvm/java-11-openjdk-11/bin/keytool -delete -alias gitlab -keystore /usr/lib64/jvm/java-11-openjdk-11/lib/security/cacerts

# List all certificates
sudo /usr/lib64/jvm/java-11-openjdk-11/bin/keytool -list -keystore /usr/lib64/jvm/java-11-openjdk-11/lib/security/cacerts

type password

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changeit

Trust this certificate? Type:

yes

And hit Enter

Restart Jenkins

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sudo systemctl restart jenkins.service

Install GitLab plugin in Jenkins and restart Jenkins
Log into the GitLab, create a project and generate a token for project.
Go to Manage Jenkins -> System and scroll down to find GitLab section.
Provide a connection name eg. GitLab, GitLab URL and credentials (use API token generated in GitLab for the project to add credentials - see the video)
Test the connection.