SSH Config

Connect to Hosts using ssh and Tab suggestion Completion, the configuration is for connection to Hosts (using private Keys) and for connection using private key and proxy setup.

Requirements:

private keys should be deposited in

~/.ssh/

Private keys should have permission rw-------

if your private keys contain a pattern private, you can execute this command to set permission.

chmod 600 *private*.pem

Public Keys should have permission rw-r--r--

if your public keys contain a pattern pub, you can execute this command to set permission.

chmod 644 *pub*.pem

--

you can use this website to understand permission https://chmod-calculator.com/

Configuration connect with no proxy

Change directory to home/.ssh

cd ~/.ssh/

Create a new file named config with no extension in this repository.

• The config should look like that

   Host vm-dev-test-1
       HostName 199.99.33.22
       StrictHostKeyChecking no
       User user1
       IdentityFile ~/.ssh/private1.pem
  
   Host vm-dev-test-2
       HostName 200.99.33.33
       StrictHostKeyChecking no
       User user2
       IdentityFile ~/.ssh/private2.pem
  

• By following the config file, user1 will connect to the vm-dev-test-1 using the private1.pem and the user2 will connect to the vm-dev-test-2 using private2.pem

Connect configuration with proxy

You can add a proxy to your Config file, by using the following configuration.

Host vm-dev-test-3
    HostName 191.13.31.72
    StrictHostKeyChecking no
    User user3
    IdentityFile ~/.ssh/private3.pem
    ProxyCommand ssh -W %h:%p proxy-dev

Host proxy-dev
  HostName proxy_host.dev.company.com
  User proxy-user

• By following this new config, user3 will connect to the vm-dev-test-3 using the private3.pem and the proxy proxy-dev with the user proxy-user

Connection test

ssh vm-dev-test-1

for the host that requires a proxy

ssh vm-dev-test-3

To prevent ssh from asking the passphrase everytime, you can just add your private key to the list maintained by ssh-agent start the ssh-add agent

eval `ssh-agent -s`
ssh-add

add your key to the agent

ssh-add ~/.ssh/your_private_key