SSH 實用指令

SSH Agent Forwarding

讓 A, B 兩台遠端主機互相傳送檔案

1. 將兩台主機的私鑰都加入本機 SSH agent:

   ssh-add ~/downloads/geth-node-1.pem
   ssh-add ~/downloads/geth-node-2.pem

2. SSH 進入第一台 EC2 instance with agent forwarding:

   ssh -A -i "~/downloads/geth-node-1.pem" ubuntu@ec2-....ap-southeast-1.compute.amazonaws.com

3. From the first instance, attempt to SCP the file using agent forwarding to authenticate on the second instance:

   scp ~/target/file ubuntu@ec2-....ap-southeast-1.compute:/path/to/destination/

SSH Tunnel

連線遠端 RDS (local port forwarding)

讓本地端可以透過 EC2 連線到 AWS RDS (EC2 要先與 RDS 設定好 security group 可互相連線)

 ssh -i "~/ec2-ssh-key.pem" -N -L localhost:5432:RDS..southeast-1.rds.amazonaws.com:5432  [e-mail]

將 SSH key 加入 SSH Agent

ssh-add -K ~/.ssh/...keyname

檢查目前讀取在 SSH Agent 的 keys

ssh-add -l

移除所有 SSH Agent keys

delete all the private keys stored in the SSH agent

ssh-add -D 

設置 git push 嘗試多個 ssh key

開啟：vim ~/.ssh/config

Host bitbucket.org
  AddKeysToAgent yes
  UseKeychain yes
  IdentityFile ~/.ssh/key1
  IdentityFile ~/.ssh/key2
  IdentityFile ~/.ssh/key3