Setting up SSH keys

1. Create a public and private key on your computer (id_rsa, id_rsa.pub)

ssh-keygen -t rsa                              


2. Copy public key to the server

scp id_rsa.pub <username@host>:~/.ssh/         


3. Login server

ssh username@host


4. Check to see if the .ssh directory and authorized key directory exists

4a. If they do not exist:

mkdir ~/.ssh
chmod 700 ~/.ssh
cat ~/id_rsa.pub >> ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
rm ~/id_rsa.pub

4b. If they do exists

cat ~/.ssh/id_rsa.pub >> .ssh/authorized_keys
rm  ~/id_rsa.pub

Notes：

id_rsa: private key
id_rsa.pub: public key
Configuring Aliases to Servers¶

So that you don't have to long in
1. create a file called config in your ~/.ssh directory

Host dev
HostName 10.0.1.1
User <your_username>

Host stage
HostName 122.100.2.246
User <your_username>

Host prod
HostName 122.100.2.237
User <your_username>

and now you can used

ssh dev

to login