Server A (main) 10.12.237.234
Server B (slave) 10.12.237.232
Requirements: Server B regularly pulls and backs up the data of Server A.
Implementation method: rsync
1. Install rsync on both servers
1) Check whether to install rpm -aq rsync installation command yum -y install rsync
2) The backup server B starts the service
rsync --daemon
3) View service
ps -ef |grep rsync #or netstat -lnutp |grep rsync
Second, the main server A configures users
New users
useradd rget
set password
echo '123456' | passwd --stdin rget
Setting permissions
setfacl -R -m user:rget:rwx /tmp
Set default permissions in time for future directory changes
setfacl -R -m default:rget:rwx /tmp
Check if the permissions are correct
getfacl /tmp
Three, backup server B generates a key
1) Generate the key (just press Enter all the time)
ssh-keygen -t rsa
2) Copy the key, here you need to enter the password just configured by server A
ssh-copy-id [email protected]
3) Test login server A (main)
4) After logging in successfully, exit and exit
Fourth, the backup server B performs synchronization
1) Execute the command
rsync -azP --delete [email protected]:/tmp /data/backup
# --delete delete data that is not in the source file
If there are files in /tmp in the backup directory, the synchronization is successful.
2) Write script
vi rsync_back.sh
#!/bin/bash
rsync -az [email protected]:/tmp /data/backup
#When backing up regularly, you can remove the P in -azP without looking at the progress.
Delete should also be removed to prevent accidental deletion.
Execute chmod +x rsync_back.sh
3) Timing synchronization every Friday at 23:00
Command crontab -e
0 23 0 0 5 /home/rsync_back.sh &
#Regular backup
tar -zcvf backup_`date +%Y-%m-%d`.tar.gz /data/backup/
Of course, it is extremely insecure to implement backups in this way. Rget users can log in to the system, which means they can perform various operations, even elevation of privileges, so you need to give proper permissions.
