In this technical post we will cover required configuration we need to setup in our servers in order to execute shell commands or shell scripts using jenkins. you can execute shell in jenkins as a build step like this.
echo "Hello World!"
Output
[jenkins-sandbox] $ /bin/sh -xe /tmp/jenkins8545009836235168037.sh
+ echo Hello World!
Hello World!
Finished: SUCCESS
If you need to execute a shell command with root privileges
sudo systemctl start jugoterapia-webflux
Then you have to add jenkins user to the sudoers group /etc/sudoers
jenkins ALL=(root) NOPASSWD: /bin/systemctl
where:
user host=(root) NOPASSWD: /path/command
With previous action our server will not ask for password when we execute that command.
Remote Execution
If you need to execute a shell script in another server, then ssh is your best friend.
ssh josdem@sonar.josdem.io "/home/josdem/jenkins/hello.sh"
where:
ssh user@remote_host "/path/command"
Output
jenkins@b612:~$ ssh josdem@sonar.josdem.io "/home/josdem/jenkins/hello.sh"
Hello World!
In order to execute previous command you need to create a ssh password-less login strategy using SSH Keygen
ssh-keygen -t rsa
Output
Generating public/private rsa key pair.
Enter file in which to save the key (/home/jenkins/.ssh/id_rsa): [Press enter key]
Created directory '/home/jenkins/.ssh'.
Enter passphrase (empty for no passphrase): [Press enter key]
Enter same passphrase again: [Press enter key]
Your identification has been saved in /home/jenkins/.ssh/id_rsa.
Your public key has been saved in /home/jenkins/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:Ts1IUtU48Vb5dVdGY8PD7eWyGcjOBzga6rb9Y7bCZVA jenkins@b612
The key's randomart image is:
+---[RSA 2048]----+
| .. oo=*|
| .M = o=X|
| .. + + +B|
| oo+o * o +|
| ..S+o= . = |
| .+. o o + |
| . ..o . |
| o.o + |
| ....=oo |
+----[SHA256]-----+
Now you are good to go and copy /home/jenkins/.ssh/id_rsa.pub to remote_server/.ssh/authorized_keys, Then in Jenkins you can setup that shell command.
ssh josdem@sonar.josdem.io "/home/josdem/jenkins/hello.sh"
Output
[jenkins-sandbox] $ /bin/sh -xe /tmp/jenkins336195165813846731.sh
+ ssh josdem@sonar.josdem.io /home/josdem/jenkins/hello.sh
Hello World!
Finished: SUCCESS