Excuting local shell script to remote Server

System admin needs to get different information from different servers for various purposes at different times. For the case of collecting informartion from many different servers, its best practise to make a script with the required query and execute that on those servers and collect the output. And that output may be needed to transfer to location PC for further annalysis.

The above task is so much time consuming for the case of different severs and gatthering the inforamtion in the local PC.  To get rid from the fatigue, we can perfrom the task with a little tricks.

Step 1: Wer can write down the scirpt with all the commands to execute on those servers.

Step 2: We can execute the script on the remote servers from local machine and forward the output to the output file.

We are focusing here the process of executing the local script to remote servers.

Suppose, we have a script[dbhostcheck.sh] as below for checking the system information:

#! /bin/bash

echo "Host Name:"|hostname

echo
echo "||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"
echo "Disk Checking"
echo "||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"
df

echo
echo "||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"
echo "CPU Utilization"
echo "||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"
sar 1 10

echo
echo "||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"
echo "Memory Utilization"
echo "||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||"

vmstat 1 10

NO we want to execute this script on a remote server. For this purpose we can excute it with the below command:

ssh user_name@name_of_host "/usr/local/bin/bash -s" -- <./dbhostcheck.sh >output.txt

Through the ssh user_name@name_of_host we are remotely accessing the host
"/usr/local/bin/bash -s": we are making the the bash for collecting standard output.-- <./dbhostcheck.sh:  Providing script information to the bash
 >output.txt redirecting the output to the file names  output.txt