OpenSSH : Use SSH-Agent2020/04/27

	Use SSH-Agent to automate inputting passphrase on key-pair authentication. Using SSH-Agent is valid for users who set SSH Key Pair with Passphrase.
[1]	It's necessarry to set key-pair with Passphrase first.
[2]	This is some example to use SSH-Agent.

# start SSH-Agent

ubuntu@node01:~$

eval $(ssh-agent)

Agent pid 1592

# add Identity

ubuntu@node01:~$

ssh-add

Enter passphrase for /home/ubuntu/.ssh/id_rsa:
Identity added: /home/ubuntu/.ssh/id_rsa (ubuntu@dlp.srv.world)

# confirm

ubuntu@node01:~$

ssh-add -l

3072 SHA256:8c0JKIhM5yPk6Kd2YloCsiKOKKjqPu5Qcot94/buwEg ubuntu@dlp.srv.world (RSA)

# try to conenct with SSH without passphrase

ubuntu@node01:~$

ssh dlp.srv.world hostname

dlp.srv.world

# exit from SSH-Agent

ubuntu@node01:~$

eval $(ssh-agent -k)

Agent pid 1592 killed

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