Introduction to SSH Remote execution command

Before , Seeing it mostly means modifying /etc/sudoers, then NOPASSWD: designated cmd, But it really doesn't work , Without remote virtual terminal, this method is floating cloud ,Ubuntu10.04 Server Personal test ！！

ssh Perform remote operations

Command format

ssh -p $port [email protected]$p 'cmd'

$port : ssh Connection port number $user: ssh Connection user name $ip:ssh Connected ip Address cmd: long-range The server Actions to be performed

preparation

Based on public-private key authentication or user name password authentication, it can ensure login to the remote local2 The server ( It's not a problem for people with basic operation and maintenance knowledge to do this )

cmd If it's a script , Note the absolute path problem （ A relative path is a hole when executed remotely ）

Insufficient

• This command can meet most of our needs , But it is usually necessary to deploy a lot of things root jurisdiction , But there are several limitations ：
• remote server local2 prohibit root The user login
• In the remote server script, use expect need send password , It's not safe enough

Execute remote server needs sudo Script for permissions

ssh Of -t Parameters

 -t      Force pseudo-tty allocation.  This can be used to execute arbitrary screen-based programs on a remote machine, which can be very useful, e.g. when implementing menu services.  Multiple -t options force tty allocation, even if ssh has no local tty.

Chinese translation ： Is a virtual server that can provide a remote server tty terminal , With this parameter, we can enter our own authorization raising password on the virtual terminal of the remote server , Very safe

Command format

ssh -t -p $port [email protected]$ip  'cmd'

Sample script

#!/bin/bash

# Variable definitions ip_array=("192.168.1.1" "192.168.1.2" "192.168.1.3") user="test1" remote_cmd="/home/test/1.sh"

# Through... Locally ssh Execute the script of the remote server for ip in ${ip_array[*]} do  if [ $ip = "192.168.1.1" ]; then   port="7777"  else   port="22"  fi  ssh -t -p $port [email protected]$ip "remote_cmd" done

This method is still very convenient ,-t Virtualize the terminal of a remote server , It really saves a lot of time when multiple servers are deployed at the same time ！