Fedora 34
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OpenSSH : Use SSH-Agent
Use SSH-Agent to automate inputting Passphrase of SSH Key-Pair authentication.
[1] This is some example to use SSH-Agent.
# run SSH-Agent

[fedora@node01 ~]$
eval $(ssh-agent)

Agent pid 2311
# add passphrase

[fedora@node01 ~]$

Enter passphrase for /home/fedora/.ssh/id_ecdsa:
Identity added: /home/fedora/.ssh/id_ecdsa (fedora@dlp.srv.world)
# confirm

[fedora@node01 ~]$
ssh-add -l

256 SHA256:JQdYQJ+nVIm+gC0Kaipk23DpIdUYDcNQBxDw+1omh8E fedora@dlp.srv.world (ECDSA)
# verify to conenct without inputting passphrase

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

# stop SSH-Agent

# if not execute it, SSH-Agent process remains even if you logout System, be careful

[fedora@node01 ~]$
eval $(ssh-agent -k)

Agent pid 2311 killed
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