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Keepalived High availability Cluster

Keepalived uses VRRP hot backup protocol to realize the multi-computer hot backup function of linux server in a software way. When one party fails, it automatically switches the backup server to work.

Keepalived deployment environment: one master scheduling server, one slave scheduling server, and multiple node servers

Keepalived deployment steps:

V install support components

# yum-y install kernel-devel openssl-devel popt-devel ipvsadm

V source code installation keepalived tool

# tar xzvf keepalived-1.2.13.tar.gz

# cd keepalived-1.2.13

#. / configure-prefix=/-with-kernel-dir=/usr/src/kernels/2.6.32-431.e16.x86_64

# make & & make install

V configure the main scheduler

# vim / etc/keepalived/keepalived.conf

Modify the relevant content:

Global_defs {

Name of the router_id R1 master scheduler

}

Vrrp_instance VI_1 {

Hot standby status of state MASTER master scheduler

The lower interface of interface eth0 master scheduler

Virtual_router_id 1 group number

Priority 100priority

Advert_int 1

Authentication {Master-Slave Hot standby Authentication Information

Auth_type PASS

Auth_pass 1111

}

Virtual_ipaddress {Cluster virtual IP address

1.1.1.100

}

Virtual_server 1.1.1.100 80 {Virtual Service address Port

Interval between delay_loop 6 health check-ups

Scheduling algorithm for lb_algo rr polling

Cluster operation mode of lb_kind DR direct routing

! Persistence_timeout 50 hold time

Protocol TCP protocol

Real_server 1.1.1.1 80 {Real Server address Port

Weight 1 weight

TCP_CHECK {Health check method

Connect_port 80 checks the target port

Connect_timeout 3 connection timeout

Number of nb_get_retry 3 retries

Delay_before_retry 3 retry interval

}

}

}

V restart the keepalived service

# Service keepalived restart

V verify that the configuration file is in effect

# ip addr to see if a virtual cluster IP has been created automatically

V configure slave scheduler

# vim / etc/keepalived/keepalived.conf

Modify the content:

Global_defs {

Router_id R2 slave scheduler name

}

Vrrp_instance VI_1 {

State BACKUP slave hot standby status of the scheduler

Interface eth0 from the lower interface of the scheduler

Virtual_router_id 1 group number

Priority 99 priority

. Other contents are the same.

V restart the keepalived service

# Service keepalived restart

V configure node server

# ifconfig lo:0 1.1.1.100/32

# route add-host 1.1.1.100 dev lo:0

# vim / etc/sysctl.conf

Add content:

Net.ipv4.conf.all.arp_ignore = 1

Net.ipv4.conf.all.arp_announce = 2

Net.ipv4.conf.lo.arp_ignore = 1

Net.ipv4.conf.lo.arp_announce = 2

Net.ipv4.conf.default.arp_ignore = 1

Net.ipv4.conf.default.arp_announce = 2

# sysctl-p

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