MoreOnJenkins

## Adding a slave/node/Agent

## Delegation for tasks between master and agent is fairly automatic
## However you can dictate if you want a particular agent for specific job
 su jenkins -s /bin/bash
 ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/var/lib/jenkins/.ssh/id_rsa):
Created directory '/var/lib/jenkins/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /var/lib/jenkins/.ssh/id_rsa.
Your public key has been saved in /var/lib/jenkins/.ssh/id_rsa.pub.
The key fingerprint is:
8d:47:14:dd:6f:a7:47:2a:7c:f9:1c:e2:b7:33:6c:e7 jenkins@ip-172-31-26-59
The key's randomart image is:
+--[ RSA 2048]----+
|          oo .   |
|         .  . .  |
|          .    . |
|         +      =|
|        S o.   *.|
|         .  o.=..|
|            .oo+.|
|             . *+|
|              ooE|
+-----------------+
bash-4.2$ cat /var/lib/jenkins/.ssh/id_rsa.pub
ssh-rsa *****key***


Create a slave server
ssh to slave
sudo su
useradd -d /var/lib/jenkins jenkins
mkdir /var/lib/jenkins/.ssh
vi /var/lib/jenkins/.ssh/authorized_keys
--- Copy the earlier generated key from master ----
install java on this slave

rpm -Uvh jdk-8u121-linux-x-64.rpm
alternatives --install /usr/bin/java java /usr/java/latest/bin/java 200000
alternatives --install /usr/bin/javac javac /usr/java/latest/bin/javac 200000
alternatives --install /usr/bin/jar jar /usr/java/latest/bin/jar 200000
vi /etc/rc.local
--
export JAVA_HOME="/usr/java/latest"
--

Go to master
manage-jenkins->manage nodes->new node
--give a name to slave and add as permanent agent
configure slave:
Remote root directory: /var/lib/jenkins