OpenSSH : Use SSH-Agent2025/04/21

	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 how to use SSH-Agent.

# start SSH-Agent

ubuntu@node01:~$

eval $(ssh-agent)

Agent pid 1610

# add Identity

ubuntu@node01:~$

ssh-add

Enter passphrase for /home/ubuntu/.ssh/id_ed25519:
Identity added: /home/ubuntu/.ssh/id_ed25519 (ubuntu@dlp.srv.world)

# confirm

ubuntu@node01:~$

ssh-add -l

256 SHA256:saW0mmPf1r0HjphkQ1+VGsCK1zqr4U7VUXKuV57pSkY ubuntu@dlp.srv.world (ED25519)

# try to connect 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 1610 killed

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