How to configure ssh-agent, agent forwarding, & agent protocol
The ssh-agent is a helper program that keeps track of users' . The agent can then use the keys to log into other servers without having the user type in a password or passphrase again.
Starting ssh-agent
On most Linux systems, ssh-agent is automatically configured and run at login, and no additional actions are required to use it.
eval `ssh-agent`
Agent pid 9238
Adding SSH keys to the Agent
The following command will list private keys currently accessible to the agent:
ssh-add -l
521 SHA256:XHmUhfIRpJ4eapb4WMi0CaDMnCvPNNqJM+1VMpKJP/0 user_name@server (ECDSA)
The ssh-agent command accepts the following options:
-a bind_address Forces binding the Unix domain socket to the given file path, instead of the default socket.
-c Forces generation of C-shell commands on stdout By default, the shell is automatically detected.
-d Enables debug mode.
-E fingerprint_hash Specifies which algorithm to use for generating SSH key fingerprints. Valid values include md5 and sha256.
-k Kills the currently running agent.
-s Forces generation of Bourne shell (/bin/sh) commands on stdout. By default, the shell is automatically detected.
-t life Specifies a maximum number of seconds that identities are kept in the agent. The value is in seconds, but can be suffixed by m for minutes, h for hours, d for days, and w for weeks. Without this option, the agent keeps the keys in its memory as long as it runs. This can be overridden when running the
Further Reading
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