ssh-add Could not open a connection to your authentication agent

While adding a new key for cloud image, I was getting the below error.

root@controller:~# ssh-add key2.pem
Could not open a connection to your authentication agent.


FIX

We need to start the ssh agent / the agent must be running, prior to adding the newkey. So I followed below steps.

root@controller:~# eval `ssh-agent -s`
Agent pid 21609

root@controller:~# ssh-add key2.pem
Identity added: key2.pem (key2.pem)