Automatic file synchronization between two Linux servers

When server B (172.17.166.11) is powered on or restarted, it will automatically pull all the files in the specified directory on server A (172.17.166.10)

1. Create mutual trust between server B and server A

(1) Execute ssh-keygen -t rsa on Server B and press Enter all the way. (2) Execute ssh-copy-id -i 172.17.166.10 on Server B and press Enter to enter the password of Server A. (3) Execute ssh 172.17.166.10 on Server B to verify whether you can log in to Server A without a password.

2. On Server B

Create the following directory structure

[root@w-11 home]# tree shell
shell
├── logs ----directory └── pull_170.sh ----script

The script is as follows:

#!/bin/bash
#pull_
#author:whz
#date:20200805
#The non-existent variable terminates the script execution set -o nounset
# Execution error terminates script execution set -o errexit
# define restricted path
PATH="/bin:/usr/bin:/sbin:/usr/sbin"
# adirname - return absolute dirname of a given file
adirname() { odir=`pwd`; cd `dirname $1`; pwd; cd "${odir}"; }
MYNAM=`basename "$0"`
MYDIR=`adirname "$0"`
MYLOG_PATH="${MYDIR}/logs"
MYLOG="${MYLOG_PATH}/${MYNAM}_`date +%F`.log"
echo "`which rsync` -avtW --progress --delete [email protected]:/home/iis/ /home/iis/" >> ${MYLOG}
`which rsync` -avtW --progress --delete [email protected]:/home/iis/ /home/iis/ >> ${MYLOG}
exit 0

3. Crontab plan on server B

crontab -e
@reboot /home/shell/pull_10.sh

That’s it, done.

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