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Hello, this is Bono.
When you are running several blogs and web services, you can't remember every IP address and ssh connection tends to be a hassle.
In such cases, the following method will make the connection much easier.
Prepare config file
Create a file named "config" in the following location.
vim ~/.ssh/config
Then, in the config file, describe the server information you want to set up the connection.
A number of settings are possible.
Host hoge1
HostName XX.XX.XXX.XXX
Port AA
User ZZZ
IdentityFile ~/.ssh/YYYY
Host hoge2
HostName XX.XXX.XX.XX
Port AAA
User ZZZZ
IdentityFile ~/.ssh/YY
Host hoge3
HostName XX.XXX.XXX.XX
Port AAA
User ZZ
IdentityFile ~/.ssh/YYY