CentOS Stream 9
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OpenSSH : Use SSH-Agent
2022/01/07
 
Use SSH-Agent to automate inputting Passphrase on SSH Key Pair authentication.
SSH-Agent is useful for users who set SSH Key Pair with Passphrase.
[1] This is some example to use SSH-Agent.
# run SSH-Agent

[cent@dlp ~]$
eval $(ssh-agent)

Agent pid 1826
# add passphrase

[cent@dlp ~]$
ssh-add

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

[cent@dlp ~]$
ssh-add -l

3072 SHA256:yYOKaIcT25Jd0ZaOOYLa+rgrU0c/M/rVmJx4q4MVZB0 cent@dlp.srv.world (RSA)
# try to connect without inputting passphrase

[cent@dlp ~]$
ssh node01.srv.world hostname

node01.srv.world
# stop SSH-Agent
# if not execute it, SSH-Agent process remains even if you logout System, be careful

[cent@dlp ~]$
eval $(ssh-agent -k)

Agent pid 1826 killed
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