How to Add Ssh Keys with ssh-add In Linux?
SSH protocol provides different ways for authentication. Key based authentication is the most secure one. In order to use key based authentication we should store the key in a command place. SSH agents reads keys and uses for authentication with remote system. We can use
ssh-add to store keys in a common path.
Public and private keys are store in files according to their algorithm.
~/.ssh/identityholds RSA version 1 identity
~/.ssh/id_dsaholds DSA version 2 identity
~/.ssh/id_rsaholds RSA version 2 identity
If identity keys are readable by others they can not used by ssh-add.
Start Ssh Agent
ssh-agent is used to read keys for authentication.
ssh-agent works as daemon. We can simply start it like below.
$ eval `ssh-agent`
Add Ssh Key
We will add ssh keys with the
ssh-add . We will provide the key we want to add. If the key is protected with encryption we need to provide the password. In this example we will add key named
mykey . This key is located in the current working directory but we can also provide absolute path of the key.
$ ssh-add mykey
List Ssh Keys
We can list added ssh keys with the
-L option like below. This will also print the type of the key with the name at the end of the line.
$ ssh-add -L