Git always asks for my ssh-key passphrase

It’s because your key is encrypted with a passphrase to prevent others from reading it.

The most convenient way of using passphrased keys is by using ssh-agent to start an authentication agent (which runs in the background):

$ eval "$(ssh-agent)"
Agent pid 44304

…and then using ssh-add to register your key with the agent so that it’s used automatically for subsequent SSH connections:

$ ssh-add ~/.ssh/id_rsa
Enter passphrase for /home/khanhpn/.ssh/id_rsa:

You’ll be asked to enter your passphrase when you run ssh-add, but you won’t need to do so again while ssh-agent is running.

You can find more information on GitHub. Also note that you’ll have to do this every time you log in, so you might like to add the eval "$(ssh-agent)" step to your .profile script.

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