Deploy lvs-dr cluster

One 、LVS+Keepalived High availability cluster

1、LVS

Linux Virtual server (Linux Virtual Server)

LVS It's actually equivalent to based on IP Address virtualization applications , Based on IP Load balancing of address and content request distribution presents an efficient solution

2、Keepalived

• Support for automatic fail over （Failover）
• Support node health status check （Health Checking）
  Judge LVS Load scheduler 、 Availability of node servers , When master In case of host failure, switch to backup The node ensures normal business , When master After the failed host recovers, it rejoins the cluster and the business is switched back to master node .

3、Keepalived Analysis of implementation principle

• keepalived use VRRP Hot backup protocol implementation Linux Multi machine hot standby function of server
• VRRP（ Virtual routing redundancy protocol ） Is a backup solution for routers .
• A hot backup group is composed of multiple routers , Through shared virtual IP Address provides services to the outside world
• There is only one primary router in each hot standby group at the same time , Other routers are redundant
• If the current online router fails , Other routers will automatically take over the virtual router according to the set priority IP Address , Continued provision of services

Two 、LVS+Keepalived High availability cluster deployment

1、 Configure the load scheduler

Turn off firewall

2、 Configure the node server

web1




Permanently save routing table

web2

3、 Client access