OpenSSH : Use SSH-Agent2023/12/19

	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

freebsd@node01:~ $

eval $(ssh-agent)

Agent pid 1129

# add Identity

freebsd@node01:~ $

ssh-add

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

# confirm

freebsd@node01:~ $

ssh-add -l

3072 SHA256:uNTwILz1kwqxTKplnlSWcxqEIB0mZQlyERz2wRML1yE freebsd@dlp.srv.world (RSA)

# try to connect with SSH without passphrase

freebsd@node01:~ $

ssh dlp.srv.world hostname

dlp.srv.world

# exit from SSH-Agent

freebsd@node01:~ $

eval $(ssh-agent -k)

Agent pid 1129 killed

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