{"id":454,"date":"2025-03-01T17:51:43","date_gmt":"2025-03-01T16:51:43","guid":{"rendered":"https:\/\/rhein-ruhr-informatik.de\/?p=454"},"modified":"2025-03-11T09:44:41","modified_gmt":"2025-03-11T08:44:41","slug":"jenkins-auf-ubuntu-22-04-lts-installieren-und-einige-administrationsaufgaben","status":"publish","type":"post","link":"https:\/\/rhein-ruhr-informatik.de\/en\/2025\/03\/01\/jenkins-auf-ubuntu-22-04-lts-installieren-und-einige-administrationsaufgaben\/","title":{"rendered":"Installing Jenkins in Ubuntu 22.04 LTS and some admin tasks"},"content":{"rendered":"
\n
\"\"<\/figure><\/div>\n\n\n

Overview<\/strong><\/p>\n\n\n\n

Jenkins is a highly popular open-source web application designed to streamline and automate the software development process. It's a cornerstone tool for Continuous Integration (CI) and Continuous Delivery (CD) pipelines, allowing developers and DevOps teams to build, test, and deploy applications efficiently..<\/strong><\/p>\n\n\n\n

Installing Jenkins     <\/strong><\/p>\n\n\n\n

There are many methods to install Jenkins in Ubuntu. Before we go to install Jenkins, we need to have already installed Java JRE (Java Runtime Environment). OpenJDK is an open-source implementation of the Java Platform It provides the core components necessary for running Java applications.<\/p>\n\n\n\n

We will work on Ubuntu-22.04 version:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Let\u2019s install OpenJDK-11 release. The steps to install this distribution in our system via putty interface. \nWe going to download the file OpenJDK-11 as archived file from the official website [https:\/\/jdk.java.net\/archive\/<\/a>] locally,<\/p>\n\n\n

\n
\"\"
OpenJDK download<\/em><\/figcaption><\/figure><\/div>\n\n\n

Then via WinSCP app we can access our Linux (Ubuntu) environment to transfer it as Binary file.<\/p>\n\n\n

\n
\"\"
OpenJDK file transfer<\/em><\/figcaption><\/figure><\/div>\n\n\n

After we have the archive file in our environment, we need first to extract it via cli.<\/p>\n\n\n\n

tar -xvzf openjdk-17.0.1_linux-x64_bin.tar.gz<\/strong><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

As we have the file in just read and write permission, we are going to give it the execute permission like:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Then when we list, it gives:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Jetzt k\u00f6nnen wir OpenJDK-17 mit dem folgenden Befehl installieren:<\/p>\n\n\n\n

sudo apt install openjdk-17-jdk -y<\/strong><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Da jedoch OpenJDK-17 bereits in meiner Umgebung installiert ist, wird die neueste Version angezeigt.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
<\/code><\/pre>\n\n\n\n
After Installation we check if the Jenkins service is active.<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
  \n  root@master:\/home\/bekber1# systemctl\n  status jenkins\n  \u25cf jenkins.service\n  - Jenkins Continuous Integration Server\n      \n  Loaded: loaded (\/lib\/systemd\/system\/jenkins.service; enabled; vendor\n  preset: enabled)\n      \n  Active: active (running) since Tue 2024-09-03 06:34:13 UTC; 2h 58min\n  ago\n    \n  Main PID: 18413 (java)\n      \n   Tasks: 63 (limit: 2178)\n      \n  Memory: 791.1M\n      \n  CGroup: \/system.slice\/jenkins.service\n               \u2514\u250018413 \/usr\/bin\/java\n  -Djava.awt.headless=true -jar \/usr\/share\/java\/jenkins.war\n  --webroot=\/var\/cache\/jenkins\/war --httpPort=xxx\n  \n<\/code><\/pre>\n\n\n\n
So, we can see that Jenkins service is Active.\nNow to be able to access the Jenkins from the web browser we need to setting up the default UFW firewall.<\/p>\n\n\n\n
Open port 8080 by running the following commands:<\/p>\n\n\n\n
 \n  root@master:\/home\/bekber1#\n  ufw allow 8080\n  Rule\n  added\n  Rule\n  added (v6)\n   \n  root@master:\/home\/bekber1#\n  ufw status\n  Status:\n  active<\/span>\n <\/code><\/pre>\n\n\n
\n
\"\"<\/figure><\/div>\n\n\n
In the putty cli we use the command to get the admin password:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
We copy the password provided by default and paste it in the filed shown in the picture above and then click Continue button. After this we getting started:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
After the installation and configuration, we must create our first Admin user as show in the picture below:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Now we can click Save and Continue and then getting the Jenkins URL as shown below:<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Now Jenkins is ready, and we can start and using it.<\/p>\n\n\n
\n
\"\"
start with Jenkins<\/em><\/figcaption><\/figure><\/div>\n\n
\n
\"\"
Login<\/em><\/figcaption><\/figure><\/div>\n\n
\n
\"\"
Jenkins-Dashboard<\/em><\/figcaption><\/figure><\/div>\n\n\n
How to change Jenkins Administrator password if we lost it:<\/p>\n\n\n\n
If we forget the Jenkins Admin password for web browser, to reset it we should follow the steps as below:<\/p>\n\n\n\n
First, we need to find where is the config.xml file is located in:<\/p>\n\n\n\n
root@master:\/home\/bekber1# cd \/var\/lib\/jenkins\/ <\/code><\/pre>\n\n\n\n
First, we need to find where is the config.xml file is located in:<\/p>\n\n\n\n
root@master:\/var\/lib\/jenkins# vim config.xml<\/code><\/pre>\n\n\n\n
So, concatonating this file in cli you can see inside the line named: \"<useSecurity>true<\/useSecurity>\"<\/code> We change it fromtrue<\/strong>tofalse<\/strong>and we restart the Jenkins service afterwards like:<\/p>\n\n\n\n
systemctl restart jenkins <\/code><\/p>\n\n\n\n
After these steps we refresh the web browser page and we will get inside the Jenkins page to make the changes because it is unsecured.<\/p>\n\n\n\n
First step is to choose theManage Jenkins<\/strong>and after we click onSecurity Realm<\/strong>“ „Jenkins‘ own user database<\/strong>. We save it and close.<\/p>\n\n\n\n
After this we can go to the underManage Jenkins<\/strong>“ -> „Security<\/strong>“ -> „Users<\/strong>we click onSettings<\/strong>click and underPassword<\/strong>we change the password.<\/p>\n\n\n\n
How-create-agent-for-built-in-node<\/strong><\/p>\n\n\n\n
In Jenkins, agents are essential for executing build jobs. Steps that we should follow are:<\/p>\n\n\n\n
We have to configuring .ssh inside the \/var\/lib\/jenkins\/.ssh\/known_host<\/p>\n\n\n\n
- we create the folder named .ssh<\/p>\n\n\n\n
root@master:\/var\/lib\/jenkins#mkdir -p \/var\/lib\/jenkins\/.ssh\nroot@master:\/var\/lib\/jenkins# chown -R jenkins:jenkins .ssh\nroot@master:\/var\/lib\/jenkins#ssh-keyscan -H agent1 >> \/var\/lib\/jenkins\/.ssh\/known_host\n\n<\/code><\/pre>\n\n\n\n
If doesn't work as e.g.<\/p>\n\n\n\n
root@master:\/etc\/ssh# ssh-keyscan -H agent1 >> \/var\/lib\/jenkins\/.ssh\/known_hosts\ngetaddrinfo agent1: Temporary failure in name resolution\ngetaddrinfo agent1: Temporary failure in name resolution\ngetaddrinfo agent1: Temporary failure in name resolution\ngetaddrinfo agent1: Temporary failure in name resolution\ngetaddrinfo agent1: Temporary failure in name resolution\n\n<\/code><\/pre>\n\n\n\n
we need to add agent1 server ip in the \/etc\/hosts<\/code>-Datei hinzuf\u00fcgen. <\/p>\n\n\n\n
To find the agent1 ip address, we use the command:<\/p>\n\n\n\n
root@master:\/etc\/ssh# dig agent1\n \n; <<>> DiG 9.16.48-Ubuntu <<>> agent1\n;; global options: +cmd\n;; Got answer:\n;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 15329\n;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1\n \n;; OPT PSEUDOSECTION:\n; EDNS: version: 0, flags:; udp: 65494\n;; QUESTION SECTION:\n;agent1.                                IN      A\n ;; Query time: 0 msec\n;; SERVER: <MyIpAddress>#53(<MyIpAddress>)\n;; WHEN: Sun Mar 10 10:33:06 UTC 2024\n;; MSG SIZE  rcvd: 35\n\n<\/code><\/pre>\n\n\n\n
and edit the \/etc\/hosts with the nano editor like:<\/p>\n\n\n\n
root@master:\/etc# cat hosts\n<MyIpAddress>localhost\n<MyIpAddress>linux-0\n<MyIpAddress>master\n<MyIpAddress>node1\n<MyIpAddress>node2\n<MyIpAddress> agent1    ----------> mit dem Nano- oder Vim-Editor m\u00fcssen wir die IP-Adresse von agent1 hinzuf\u00fcgen.\n\/etc\/hosts\n# The following lines are desirable for IPv6 capable hosts\n::1     ip6-localhost ip6-loopback\nfe00::0 ip6-localnet\nff00::0 ip6-mcastprefix\nff02::1 ip6-allnodes\nff02::2 ip6-allrouters\n<\/code><\/pre>\n\n\n\n
Nach Ausf\u00fchrung des Befehls ssh-keyscan -H agent1 >> \/var\/lib\/jenkins\/.ssh\/known_hosts erhalten wir die Aufl\u00f6sung:<\/p>\n\n\n\n
root@master:\/etc# ssh-keyscan -H agent1 >> \/var\/lib\/jenkins\/.ssh\/known_hosts\n# agent1:22 SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.11\n# agent1:22 SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.11\n# agent1:22 SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.11\n# agent1:22 SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.11\n# agent1:22 SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.11\n<\/code><\/pre>\n\n\n\n
Jenkins agent1 in port 22 is resolved:<\/p>\n\n\n\n
root@master:\/etc# cd \/var\/lib\/jenkins\/.ssh\/\nroot@master:\/var\/lib\/jenkins\/.ssh# ll\ntotal 12\ndrwxr-xr-x  2 jenkins jenkins 4096 Mar 10 10:11 .\/\ndrwxr-xr-x 15 jenkins jenkins 4096 Mar 10 10:05 ..\/\n-rw-r--r--  1 jenkins jenkins  978 Mar 10 10:36 known_hosts\n\nroot@master:\/var\/lib\/jenkins\/.ssh# cat known_hosts\n|1|UMnpRmZeDMTxf8bAmPYanyzeE54=|C7tpVgwzVbu7FDJG4fUiDVN3L4I= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBAunO9x3A5IInM2Qqqf4wwWBEokfH8pRiMVcrjNTNn7hCZrgi75hbRbV+dG8hy2xhUtDlywP0k0S\/+qpSwoVd7E=\n|1|nPGx2tNNjsRAU6ZYf7UqlI1iGcM=|TqWQT18KAS56FgREOVEfVUvvILQ= ssh-rsa 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\n|1|1JIhNCOumg+yjaTgMMYtcGAkC6o=|B\/ZgF81ZU+t+8AbByBU3hwp68X0= ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFLr95lmAUl1k0+zxfhzG4B9fvrvPtddpxOCII+abRfO\n\nroot@master:\/var\/lib\/jenkins\/.ssh#\n<\/code><\/pre>\n\n\n\n
Jenkins-Logs:<\/p>\n\n\n\n
Warning: no key algorithms provided; JENKINS-42959 disabled\nSSHLauncher{host='agent1', port=22, credentialsId='linux-0', jvmOptions='', javaPath='', prefixStartSlaveCmd='', suffixStartSlaveCmd='', launchTimeoutSeconds=60, maxNumRetries=10, retryWaitTime=15, sshHostKeyVerificationStrategy=hudson.plugins.sshslaves.verifiers.KnownHostsFileKeyVerificationStrategy, tcpNoDelay=true, trackCredentials=true}\n[03\/10\/24 10:43:30] [SSH] Opening SSH connection to agent1:22.\nSearching for agent1 in \/var\/lib\/jenkins\/.ssh\/known_hosts\nSearching for agent1:22 in \/var\/lib\/jenkins\/.ssh\/known_hosts\n[03\/10\/24 10:43:30] [SSH] SSH host key matches key in Known Hosts file. Connection will be allowed.\n[03\/10\/24 10:43:31] [SSH] Authentication successful.\n[03\/10\/24 10:43:32] [SSH] The remote user's environment is:\nBASH=\/usr\/bin\/bash\n.\n.\n.\n<===[JENKINS REMOTING CAPACITY]===>channel started\nRemoting version: 3206.vb_15dcf73f6a_9\nLauncher: SSHLauncher\nCommunication Protocol: Standard in\/out\nThis is a Unix agent\nAgent successfully connected and online\n<\/code><\/pre>\n\n\n\n
Conclusion<\/strong><\/p>\n\n\n\n
Jenkins is a valuable tool for automating software development processes. By understanding its core features, installation, configuration, security, and agent management, you can effectively leverage Jenkins to improve your CI\/CD pipelines and deliver high-quality software.<\/p>\n\n\n\n
Referenz:<\/strong><\/p>\n\n\n\n
https:\/\/community.jenkins.io\/t\/can-i-create-agent-for-built-in-node\/1183<\/a><\/p>\n\n\n\n
https:\/\/jdk.java.net\/archive<\/a><\/p>\n\n\n\n
<\/p>","protected":false},"excerpt":{"rendered":"
\u00dcbersicht Jenkins ist eine \u00e4u\u00dferst beliebte Open-Source-Webanwendung, die entwickelt wurde, um den Softwareentwicklungsprozess zu rationalisieren und zu automatisieren. Es ist ein Eckpfeiler f\u00fcr Continuous Integration (CI) und Continuous Delivery (CD)-Pipelines und erm\u00f6glicht es Entwicklern und DevOps-Teams, Anwendungen effizient zu erstellen, zu testen und bereitzustellen. Jenkins installieren      Es gibt viele Methoden, […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,13,15],"tags":[],"class_list":["post-454","post","type-post","status-publish","format-standard","hentry","category-articles","category-jenkins","category-linux"],"yoast_head":"\nJenkins auf Ubuntu 22.04 LTS installieren und einige Administrationsaufgaben - Rhein-Ruhr-Informatik<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rhein-ruhr-informatik.de\/en\/2025\/03\/01\/jenkins-auf-ubuntu-22-04-lts-installieren-und-einige-administrationsaufgaben\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Jenkins auf Ubuntu 22.04 LTS installieren und einige Administrationsaufgaben - Rhein-Ruhr-Informatik\" \/>\n<meta property=\"og:description\" content=\"\u00dcbersicht Jenkins ist eine \u00e4u\u00dferst beliebte Open-Source-Webanwendung, die entwickelt wurde, um den Softwareentwicklungsprozess zu rationalisieren und zu automatisieren. Es ist ein Eckpfeiler f\u00fcr Continuous Integration (CI) und Continuous Delivery (CD)-Pipelines und erm\u00f6glicht es Entwicklern und DevOps-Teams, Anwendungen effizient zu erstellen, zu testen und bereitzustellen. 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