IP Failover Setup using Keepalived on CentOSRedhat 6

概述source url：http://tecadmin.net/ip-failover-setup-using-keepalived-on-centos-redhat-6/Keepalivedis us

source url：

Keepalived is used for IP failover between two servers. It facilities for load balancing and high-availability to linux based infrastructures. It works on VRRP ( Virtual Router Redundancy Protocol ) protocol. We have running two load balance servers using HAProxy and now we need to implement VRRP between both servers. This tutorial will help you to configure KeepAliveD,Use tutorial to configure HAProxy on both servers.

  1. LB1 Server: 192.168.10.111 ( eth1 )  2. LB2 Server: 192.168.10.112 ( eth1 )  3. Virtual IP: 192.168.10.121

Now we are implementing ip failover setup between LB1 and LB2 servers.

Use following command to install required packages to configure Keepalived on server.

# yum install gcc kernel-headers kernel-devel

Keepalived is available in centos base repository. Install it using yum command line tool.

# yum install keepalived

Keepalived configuration file: /etc/keepalived/keepalived.conf

Edit Keepalived configuration file on LB1 and add following configuration.

vrrp_instance VI_1 {interface eth1state MASTERvirtual_router_ID 10priority 101   # 101 on master,100 on backupvirtual_ipaddress {192.168.10.121}}

Edit Keepalived configuration file on LB2 and add following configuration.

vrrp_instance VI_1 {interface eth1state BACKUPvirtual_router_ID 10priority 100   # 101 on master,100 on backupvirtual_ipaddress {192.168.10.121}}

Note: 1. priority value will be higher on Master server,It doesn't matter what you used in state.  If your state is MASTER but your priority is lower than the router with BACKUP,you will lose the MASTER state.2. virtual_router_ID should be same on both LB1 and LB2 servers.3. By default single vrrp_instance support up to 20 virtual_ipaddress. In order to add more addresses you need to add more vrrp_instance 

Start Keepalived service using following command and also configure to auto start on system boot.

# service keepalived start# chkconfig keepalived on

By default virtual ip will assigned to master server,In case of master get down,it will automatically assigned to slave server. Use following command to show assigned virtual ip on interface.

# ip addr show eth1

Sample output

2: eth1:  mtu 1500 qdisc pfifo_fast state UNKNowN qlen 1000    link/ether 00:0c:29:6f:ed:60 brd ff:ff:ff:ff:ff:ff    inet 192.168.10.111/24 brd 192.168.1.255 scope global eth1    inet 192.168.10.121/32 scope global eth1    inet6 fe80::20c:29ff:fe6f:ed60/64 scope link       valID_lft forever preferred_lft forever

1. Shutdown master server ( LB1 ) and check if ips are automatically assigned to slave server.

# ip addr show eth1

2. Now start LB1 and stop slave server ( LB2 ). IPs will automatically assigned to master server.

# ip addr show eth1

3. Watch log files to insure its working

# tailf /var/log/messages

Sample Output

Mar 19 17:30:24 localhost Keepalived_vrrp[6958]: VRRP_Instance(VI_1) Transition to MASTER STATEMar 19 17:30:25 localhost Keepalived_vrrp[6958]: VRRP_Instance(VI_1) Entering MASTER STATEMar 19 17:30:25 localhost Keepalived_vrrp[6958]: VRRP_Instance(VI_1) setting protocol VIPs.Mar 19 17:30:25 localhost Keepalived_healthcheckers[6957]: Netlink reflector reports IP 192.168.10.121 addedMar 19 17:30:25 localhost avahi-daemon[1407]: Registering new address record for 192.168.10.121 on eth1.IPv4.Mar 19 17:30:25 localhost Keepalived_vrrp[6958]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 

I hope this article will help to setup IP failover between two load balance servers.

Related posts: Its a good practice to enable email alerts in your... The DNS ( Domain Name System ) is a distributed... Sendmail is a mail server used for sending and receiving...href="http://tecadmin.net/keep-your-centosredhat-server-up-to-date/" rel="bookmark" title="Keep your CentOS/Redhat server up to date">Keep your CentOS/Redhat server up to date Hi Guys,Being a system administrator,you always need to... 总结

以上是内存溢出为你收集整理的IP Failover Setup using Keepalived on CentOS/Redhat 6全部内容，希望文章能够帮你解决IP Failover Setup using Keepalived on CentOS/Redhat 6所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。