KeepAlive installation Configuration

Keepalived configuration, you can refer to: http://www.keepalived.org/documentation.html
Environmental Preparedness

The LINUX version required for the system is: the keepalived version required by 2.6.9‐5.ELSMP is: 1.1.20

? Check Linux version

[Root@test01 etc]# Uname-r

2.6.9-5.elsmp

? Check the keepalived version

[Root@test01 keepalived]# pwd

/root/disk/keepalived

[Root@test01 keepalived]# Cat VERSION

1.1.20 2 Target

Two servers, one master standby. provides two virtual IP.

Server a:10.10.0.41 (primary server)

Server b:10.10.0.118 (standby server)

Virtual IP:10.10.0.44/45

Normal condition, the primary server provides the service, the primary server fails, the standby server takes over. 3 Installation KeepAlive

[root@test01 keepalived]#./configure

......

[Root@test01 keepalived]# make

......

[root@test01 keepalived]# make install

......

# cp/usr/local/etc/rc.d/init.d/keepalived/etc/rc.d/init.d/

# cp/usr/local/etc/sysconfig/keepalived/etc/sysconfig/

# mkdir/etc/keepalived

# cp/usr/local/etc/keepalived/keepalived.conf/etc/keepalived/

# cp/usr/local/sbin/keepalived/usr/sbin/

Make system start service convenient management.

# vi/etc/rc.local

/etc/init.d/keepalived start

Add the above line. 4 configuration keepalived (Master/slave mode) 4.1 Primary Server

# vi/etc/keepalived/keepalived.conf

Configured as follows:

! Configuration File for Keepalived

Global_defs {

Notification_email {Acassen@firewall.loc

Failover@firewall.loc

Sysadmin@firewall.loc

}

Notification_email_from Alexandre.Cassen@firewall.loc

Smtp_server 192.168.200.1

Smtp_connect_timeout 30

router_id Lvs_devel

}

Vrrp_instance Vi_1 {

State MASTER

Interface eth0

VIRTUAL_ROUTER_ID 51 # Keep The primary standby server consistent

Priority 100 # Priority (primary server should be higher than backup server)

Advert_int 1 # Heartbeat Broadcast time interval (sec)

Authentication {

Auth_type Pass

Auth_pass 1111

}

virtual_ipaddress {

10.10.0.44 # Virtual IP address, can be multiple.

10.10.0.45

} 4.2 standby server

# vi/etc/keepalived/keepalived.conf

Configured as follows:

! Configuration File for Keepalived

Global_defs {

Notification_email {

Acassen@firewall.loc

Failover@firewall.loc

Sysadmin@firewall.loc

}

Notification_email_from Alexandre.Cassen@firewall.loc

Smtp_server 192.168.200.1

Smtp_connect_timeout 30

router_id Lvs_devel

}

Vrrp_instance Vi_1 {

State BACKUP

Interface eth0

VIRTUAL_ROUTER_ID 51 # Keep The primary standby server consistent

Priority 90 # Priority (primary server should be higher than backup server) Advert_int 1 # Heartbeat Broadcast time interval (sec)

Authentication {

Auth_type Pass

Auth_pass 1111

}

virtual_ipaddress {

10.10.0.44 # Virtual IP address, can be multiple.

10.10.0.45

}

} 5 Start the primary server keepalived

# service Keepalived Start

# IP A

1:LO:MTU 16436 Qdisc Noqueue

Link/loopback 00:00:00:00:00:00 BRD 00:00:00:00:00:00

inet 127.0.0.1/8 Scope host Lo

INET6:: 1/128 Scope Host

Valid_lft Forever Preferred_lft Forever

2:ETH0:MTU 1500 Qdisc pfifo_fast Qlen

1000

Link/ether 00:10:5C:C8:1C:F2 BRD FF:FF:FF:FF:FF:FF

inet 10.10.0.41/16 BRD 10.10.255.255 Scope Global eth0

inet 10.10.0.44/32 Scope Global eth0 inet 10.10.0.45/32 scope Global eth0

Inet6 FE80::210:5CFF:FEC8:1CF2/64 Scope link

Valid_lft Forever Preferred_lft Forever

3:SIT0:MTU 1480 Qdisc NoOp

Link/sit 0.0.0.0 BRD 0.0.0.0

As you can see, the 10.10.0.44/45 two virtual IP has been hooked up to the NIC Eth0. 6 boot standby server keepalived

# service Keepalived Start

# IP A

1:LO:MTU 16436 Qdisc Noqueue

Link/loopback 00:00:00:00:00:00 BRD 00:00:00:00:00:00

inet 127.0.0.1/8 BRD 127.255.255.255 Scope host Lo

INET6:: 1/128 Scope Host

Valid_lft Forever Preferred_lft Forever

2:ETH0:MTU 1500 Qdisc pfifo_fast Qlen

1000

Link/ether 00:14:2A:03:33:CA BRD FF:FF:FF:FF:FF:FF

inet 10.10.0.118/16 BRD 10.10.255.255 Scope Global eth0

Inet6 FE80::214:2AFF:FE03:33CA/64 Scope link

Valid_lft Forever Preferred_lft Forever

3:SIT0:MTU 1480 Qdisc NoOp

Link/sit 0.0.0.0 BRD 0.0.0.0

As you can see, the 10.10.0.44/45 two virtual IP is not hooked up on the NIC Eth0. 7 Verification Test 7.1 Validation Preparation

Test Service: Start the Apache service separately on both servers and modify the default index.html file.

Displays the current server IP for identification.

# Curl http://10.10.0.118

It works! 10.10.0.118

# Curl http://10.10.0.41

It works! 10.10.0.41

You can see that the HTTPD service for two servers is normal. 7.2 Check the working status of the virtual IP

# Curl http://10.10.0.44

It works! 10.10.0.41

# Curl http://10.10.0.45

It works! 10.10.0.41 7.3 Stop the primary server keepalived

# Service Keepalived Stop

# IP A

[root@test01 ~]# IP A

1:LO:MTU 16436 Qdisc Noqueue

Link/loopback 00:00:00:00:00:00 BRD 00:00:00:00:00:00 inet 127.0.0.1/8 Scope host Lo

INET6:: 1/128 Scope Host

Valid_lft Forever Preferred_lft Forever

2:ETH0:MTU 1500 Qdisc Pfifo_fast

Qlen 1000

Link/ether 00:10:5C:C8:1C:F2 BRD FF:FF:FF:FF:FF:FF

inet 10.10.0.41/16 BRD 10.10.255.255 Scope Global eth0

Inet6 FE80::210:5CFF:FEC8:1CF2/64 Scope link

Valid_lft Forever Preferred_lft Forever

3:SIT0:MTU 1480 Qdisc NoOp

Link/sit 0.0.0.0 BRD 0.0.0.0

As you can see, the 10.10.0.44/45 two virtual IP is not hooked up on the NIC Eth0. 7.4 Verify standby server keepalived status

[Root@localhost ~]# Curl http://10.10.0.44

It works! 10.10.0.118

[Root@localhost ~]# Curl http://10.10.0.45

It works! 10.10.0.118 7.5 Reboot The primary server keepalived State

# service Keepalived Start

# IP A

1:LO:MTU 16436 Qdisc Noqueue

Link/loopback 00:00:00:00:00:00 BRD 00:00:00:00:00:00

inet 127.0.0.1/8 Scope host lo inet6:: 1/128 Scope Host

Valid_lft Forever Preferred_lft Forever

2:ETH0:MTU 1500 Qdisc pfifo_fast Qlen

1000

Link/ether 00:10:5C:C8:1C:F2 BRD FF:FF:FF:FF:FF:FF

inet 10.10.0.41/16 BRD 10.10.255.255 Scope Global eth0

inet 10.10.0.44/32 Scope Global eth0

inet 10.10.0.45/32 Scope Global eth0

Inet6 FE80::210:5CFF:FEC8:1CF2/64 Scope link

Valid_lft Forever Preferred_lft Forever

3:SIT0:MTU 1480 Qdisc NoOp

Link/sit 0.0.0.0 BRD 0.0.0.0 7.6 Verifying primary server keepalived status

[Root@localhost ~]# Curl http://10.10.0.44

It works! 10.10.0.41

[Root@localhost ~]# Curl http://10.10.0.45

It works! 10.10.0.41 8 Attachment: Master/master configuration mode

The backup server (server B) in the Master/slave scenario is usually a device, a bit wasteful. We can be used to run other services, so that two hosts to form mutual hot standby.

Server a:192.168.1.10, Virtual ip:192.168.1.100

Server b:192.168.1.20, Virtual ip:192.168.1.200

Modify configuration file: Server A Host:

Global_defs {

router_id Lvs_devel

}

Vrrp_instance Vi_1 {

State MASTER

Interface eth0

VIRTUAL_ROUTER_ID 51

Priority 100

Advert_int 1

Authentication {

Auth_type Pass

Auth_pass 1111

}

virtual_ipaddress {

192.168.1.100

}

}

Vrrp_instance Vi_2 {

State BACKUP Interface Eth0

VIRTUAL_ROUTER_ID 52

Priority 99

Advert_int 1

Authentication {

Auth_type Pass

Auth_pass 1111

}

virtual_ipaddress {

192.168.1.200

}

}

Server B Host:

Global_defs {

router_id Lvs_devel

}

Vrrp_instance Vi_1 {

State BACKUP

Interface eth0

VIRTUAL_ROUTER_ID Wuyi Priority 99

Advert_int 1

Authentication {

Auth_type Pass

Auth_pass 1111

}

virtual_ipaddress {

192.168.1.100

}

}

Vrrp_instance Vi_2 {

State MASTER

Interface eth0

VIRTUAL_ROUTER_ID 52

Priority 100

Advert_int 1

Authentication {

Auth_type Pass

Auth_pass 1111

}

virtual_ipaddress {

192.168.1.200

}

}

In fact very simple, we added a new configuration vi_2 (note virtual_router_id different). However, this is used Server B to host the servers, so that server A, Server B each owns the primary virtual IP, while backing up

Each other's virtual IP. This scenario can be a different service, or a access diversion for the same service (with DNS use).