How to configure keepalived service in CentOS 6/7

Keepalived is a service in Linux to manage the failover between two servers. You can deploy this service in High-viability environment where your public interface IP(Virtual IP address) need to switch between two server when one goes down.

Requirement

Server1 ip address : 192.168.35.147

Server2 ip address: 192.168.35.144

Virtual ip address: 192.168.35.150

Install dependency package on both server

# yum install gcc kernel-headers kernel-devel

Install keepalived package on both server

# yum install keepalived

Configure keepalived on server1

# vim /etc/keepalived/keepalived.conf

! 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

    priority 101

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.35.150

    }

}

Configure keepalived on server2

# vim /etc/keepalived/keepalived.conf

! 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

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        192.168.35.150

    }

}

Start service on both server (On CentOS 6)

# service keepalived start

# chkconfig keepalived on

Start service on both server (On CentOS 7)

#sysctemctl start keepalived.service

#systemctl enabled keepalived.service

To test the keepliaved service configure apache service on both server.

# yum install httpd

Start apache service (On CentOS 6)

# service httpd start

#chkconfig httpd on

Start apache service (On CentOS 7)

#systemctl  start httpd

#systemctl enabled httpd

Now access server using virtual ip which you have defined in configuration file

URL:  http://Virtual_IP_Address/

Share on Google Plus

About Penguin Technology

I am a passionate cloud and DevOps professional specializing in Linux and open-source solutions. Through this blog, I share my knowledge and experience with the community, offering tips and insights on cloud technologies and DevOps practices.