SSH

SSH

SSH login through multiple jump servers

$ ssh -J user1@jump1:port1[,user2@jump2:port2],... user@target-server [-p port]

SSH proxy tunnel

TODO

Configure SSH Key-Based Authentication on a Linux Server

creating SSH Keys on you local machine
- we can use ssh-keygen to generate a key pair, by default, this will create a 3072 bit RSA key pair.
```
$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/mebusy/.ssh/id_rsa): 
```
- It is best to stick with the default location at this stage.
  - Doing so will allow your SSH client to automatically find your SSH keys when attempting to authenticate.
```
$ ls ~/.ssh
config          id_rsa          id_rsa.pub      known_hosts     known_hosts.old
```
Copying an SSH Public Key to Your Server
- method1
```
cat ~/.ssh/id_rsa.pub | ssh username@remote_host "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"
```
- method2
  - manually copy content of your public key, and append it to server's ~/.ssh/authorized_keys

Now you should be able to log into the remote host without the remote account’s password.