Setup target instance to allow Jenkins deploy to

THIS PART FORCUSING ON TARGET SERVER ONLY.
PatharaNor
Tech Writer

Create credential in Jenkins

Create SSH key on target machine with RSA type (using -t to identify encrypt type)

ssh-keygen -t rsa

It will generate id_rsa and id_rsa.pub in folder ~/.ssh:

...
-rw------- 1 username username 1675 Aug  1 16:16 id_rsa
-rw-r--r-- 1 username username  420 Aug  1 16:16 id_rsa.pub
...

Copy content of public key or id_rsa.pub to authorized_keys by

# In ~/.ssh directory
cat id_rsa.pub >> authorized_keys

For id_rsa or private key, we will copy content in id_rsa to text box when create credential in Jenkins.

# example id_rsa content
-----BEGIN RSA PRIVATE KEY-----
MIIEogIBAAKCAQEAtuwxg9eWuFS+ZXa6JXusfp7pncmycT5yEB2sOVfXseC2v6c9
5hLldmOu7b8B5mIZZAvz8fxl+8sp8T48iuuk3SQaMq3RIIxoaF2qpBe78wvXTFtb
538P...................................................gsCW0hV7R
lF7dAoGAb+KH6UUUiQZp3YM3nQabresdAbw8IM3nDebTPBOJiWihYx6TsfHkzPoH
HQpWGiFVggr/mZH7v04sdyw/xzUM29VyeFz93aGYtEZFpU2MwBaz8233wZMSbfa5
KmgYibbEWCh1xbQNaJ9mMg+F1dQecZxiBXYW2OYufhHBDaSOa2c=
-----END RSA PRIVATE KEY-----

File Permission

Your authorized_keys and ~/.ssh should set permission look like below:

~/.ssh/authorized_keys file :

chmod 600 authorized_keys

.ssh folder

chmod 700 ~/.ssh

After that switch to Jenkins, go to :

http://YOUR_JENKINS_IP:YOUR_JENKINS_PORT/credentials/store/system/

click on Global credentials (unrestricted) then click on Add Credentials to create credential of each target machine.

Example :

Kind        : SSH Username with private key
Scope       : Global (Jenkins, nodes, items, all child items, etc)
Username    : YOUR_USERNAME_OF_TARGET_MACHINE
Private Key : select on "Enter directly"
Key         :
-----BEGIN RSA PRIVATE KEY-----
MIIEogIBAAKCAQEAtuwxg9eWuFS+ZXa6JXusfp7pncmycT5yEB2sOVfXseC2v6c9
5hLldmOu7b8B5mIZZAvz8fxl+8sp8T48iuuk3SQaMq3RIIxoaF2qpBe78wvXTFtb
538P...................................................gsCW0hV7R
lF7dAoGAb+KH6UUUiQZp3YM3nQabresdAbw8IM3nDebTPBOJiWihYx6TsfHkzPoH
HQpWGiFVggr/mZH7v04sdyw/xzUM29VyeFz93aGYtEZFpU2MwBaz8233wZMSbfa5
KmgYibbEWCh1xbQNaJ9mMg+F1dQecZxiBXYW2OYufhHBDaSOa2c=
-----END RSA PRIVATE KEY-----
Passphrase  : LET_EMPTY
ID          : LET_EMPTY
Description : YOUR_DESCRIPTION

Allow Jenkins create folder on target directory, example /app/ :

sudo chown $USER:$USER app opt

Now your Jenkins should be accessable this instance.