CentOS Stream 8
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Jenkins : Install2021/04/14

Install CD (Continuous Delivery) System, Jenkins.
[2] Install and start Jenkins.
# get Jenkins official repository

[root@dlp ~]#
curl https://pkg.jenkins.io/redhat-stable/jenkins.repo > /etc/yum.repos.d/jenkins.repo
# get GPG key and install Jenkins

[root@dlp ~]#
rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key

[root@dlp ~]#
dnf -y install jenkins
[root@dlp ~]#
vi /etc/sysconfig/jenkins
# line 65 : add IP address Jenkins listens (listen all with [])

[root@dlp ~]#
systemctl enable --now jenkins

[3] If Firewalld is running, allow service ports.
[root@dlp ~]#
firewall-cmd --add-port=8080/tcp --permanent

[root@dlp ~]#
firewall-cmd --reload

[4] Access to [https://(server's hostname or IP address):8080/] with Web browser from localhost or any Client Host, then, initial admin password is required to enter initial setup. Make sure initial admin password that is saved in [/var/lib/jenkins/secrets/initialAdminPassword] and input it to enter setup.
[5] This is the Jenkins initial setup. Select to install suggested plugins or to install from your own selected plugins. (proceed with [suggested plugins] on this example)
[6] The initial setup tasks run.
[7] Setting administrative user and password is required. Set any username and password you like.
[8] If you'd like to change Jenkins URL, change it on here. (proceed with default on this example)
[9] Initial setup finished. Click [Start using Jenkins] button to move Jenkins index page.
[10] This is the Jenkins index page.
[11] For next access to Jenkins, Login form is shown like follows, it's possible to authenticate with users you added in Jenkins.
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