Bi-Directional-Sync

Note:

• requires rsync >= 3.1 on all source and target machines

Real-time bi-directional synchronization tools between two data centers base on lsyncd. The sync direction control by DNS from master to slave.

Install Packages

• lsyncd
• lua-socket

yum install -y rsync

rpm -ivh https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/l/lsyncd-2.2.2-1.el7.x86_64.rpm
rpm -ivh https://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/l/lua-socket-3.0-0.17.rc1.el7.x86_64.rpm 

Clone and Config

Note: Use dos2unix reformat all files

vim /etc/lsyncd/config.json

Params:

• host: target server
• delete: whether to allow deletion when synchronizing
• script: the path of shell script
• excludeFrom: list of files that need to be excluded
• port: ssh port
• bwlimit: bandwidth limit
• ...

Access without Requiring a Password

ssh-keygen -t rsa
ssh-copy-id root@target

Execute Lsyncd

• start with utils/lsyncd-cli.sh

./utils/lsyncd-cli.sh start

• start with systemctl

# modify 'LSYNCD_OPTIONS' point to the conf/bisync.conf.lua 
vim /etc/sysconfig/lsyncd

# enable auto startup when boosting
systemctl enable lsyncd

# start
systemctl start lsyncd

Reference

• lsyncd实时同步搭建指南
• lsyncd