If you’re like me and you work with alot of machines or frequently spin up
and teardown vagrant boxes, then your ssh config file (e.g. $HOME/.ssh/config)
is littered with entries like:
Host 192.168.1.*
IdentitiesOnly yes
IdentityFile ~/.ssh/id_rsa-foo
Host 10.10.10.*
User baz
IdentitiesOnly yes
IdentityFile ~/.ssh/id_rsa.bar
When the machine you’d like to ssh into falls within one of the config ip ranges, but you’d like to override the rsa key used:
$ ssh -vvv -o PubkeyAuthentication=no -o IdentitiesOnly=yes -o IdentityFile=~/.ssh/id_rsa.private foo@127.0.0.1