Jenkins ssh-agent plug in

https://support.cloudbees.com/hc/en-us/articles/222838288-SSH-Credentials-Management-with-Jenkins

https://support.cloudbees.com/hc/en-us/articles/222978868-How-to-Connect-to-Remote-SSH-Agents-#:~:text=In%20Jenkins%3A&text=Choose%20SSH%20Username%20with%20private,useful%20Description%20for%20this%20credential.

Jenkins ssh-agent only takes user and private key as credentials for build jobs, not user and password, otherwise you will get error below:

FATAL: [ssh-agent] Could not find specified credentials

[ssh-agent] Looking for ssh-agent implementation... 

[ssh-agent] Exec ssh-agent (binary ssh-agent on a remote machine)

.....

Permission denied, please try again. 

Permission denied (publickey,password).

Target remote server must have completed setting for ssh login via private key before. (public key in ~/.ssh/authorized_keys)