/Jenkins-lab

Jenkins-lab

How to install

Follow Instructions

If fails after running sudo apt install jenkins with an error saying that could not find Java =>

  1. sudo apt install openjdk-9-jre
  2. sudo apt install openjdk-8-jre
  3. Open sudo vi /etc/init.d/jenkins
  4. Finally, append path to the new java executable (line 16): PATH=/bin:/usr/bin:/sbin:/usr/sbin:/usr/lib/jvm/java-8-openjdk-amd64/bin/

Source

If still fails saying that port is already in use then:

  1. sudo vim /etc/default/jenkins
  2. Change HTTP_PORT
  3. sudo systemctl start jenkins

Debug:

sudo su - jenkins -s/bin/bash

Some examples

You can find examples of jobs in folder examples in this repo. All of them were built based on Tutorials

In order to import them into Jenkins (details find below in Jenkins CLI section): java -jar jenkins-cli.jar -auth USERNAME:USERPASS -s http://localhost:9090 create-job newmyjob < myjob.xml

Useful Commands:

systemctl enable jenkins # Enable the Jenkins service to start automatically.
service jenkins start
service jenkins status
service jenkins restart

Install Plugins:

If you can't find necessary plugin in Web UI then:

  1. Go to http://updates.jenkins.io/download/plugins and find page of your plugin

  2. After you know the name of necassary plugin (for example, it is "credentials") go by link: http://updates.jenkins.io/download/plugins/credentials/

  3. Download *.hpi file

  4. In Web UI in "Manage Plugins" go to Advanced and there upload this *.hpi file

Reset Password:

Instructions: https://www.serverlab.ca/tutorials/linux/administration-linux/how-to-reset-jenkins-admin-users-password/

Touble shooting

Error "Docker: Got permission denied while trying to connect..." then sudo usermod -a -G docker jenkins

Error "No module named .." or "Permission denied..." probably means that Jenkins user does not have access to python folder packages. For resolving this

  1. sudo su - jenkins -s/bin/bash

  2. Check that u are under jenkins user: whoami

  3. Install necessary packages/libraries and then exit jenkins user

  4. If needed also manually install all necessary libraries

Jenkins CLI

  1. Download jar: wget http://34.121.35.34:9090/jnlpJars/jenkins-cli.jar

  2. Check that all is correct: java -jar jenkins-cli.jar -auth USERNAME:USERPASS -s http://localhost:9090 who-am-i

  3. Export Job: java -jar jenkins-cli.jar -auth USERNAME:USERPASS -s http://localhost:9090 get-job myjob > myjob.xml

  4. Import Job: java -jar jenkins-cli.jar -auth USERNAME:USERPASS -s http://localhost:9090 create-job newmyjob < myjob.xml

Tutorials [Russian]

Tutorials

Watch videos

№1: Intro

№3: Web UI and settings

№5: Important tutorial. Shows how to build most simple jobs (with build, test and deployment stages) + how to do ssh deployment

№6: (optional) how to connect few servers . only need in case you have large amout of jobs

№7: (optional) Jenkins CLI (how to import/export jobs)

№8: Deployment from GitHub (your username should match with user in ssh-key, for this use ssh-keygen -C DmitriiDenisov -f new_key)

№9: (optional) Jenkins Build Triggers

№ 10: Jenkins trigger from GitHub, Jenkins webhook

№11: Build with parameters