Keepalived configure for Failover

Friends,

Today I am showing Haproxy setup along with Keepalived. In this blog I will setup Keep alive. HaProxy setup will be done on my next blog.

Keepalived is used to achieve high availability by assigning a VIP to two or more servers.

Installation:-
I am doing this on two ubuntu servers having ip 172.16.1.209 and 172.16.1.211. The virtual IP will be 172.16.1.210.

Install packages

apt-get install keepalived

Configuring keepalived

Create the config file on the first server (172.16.1.209):

vim /etc/keepalived/keepalived.conf




global_defs {

  router_id NM-PRD-HAPROXY-209

}

vrrp_script haproxy {

script "killall -0 haproxy"

interval 1

weight 2

}

vrrp_instance 50 {

virtual_router_id 50

advert_int 1

priority 101

state MASTER

interface eth0

virtual_ipaddress {

172.16.1.210

  }

  track_script {

haproxy

  }

authentication {

        auth_type PASS

        auth_pass We$,J)Og&

    }

}

Create the config file on the second server (172.16.1.211)

vim /etc/keepalived/keepalived.conf




global_defs {

  router_id NM-PRD-HAPROXY-211

}

vrrp_script haproxy {

  script "killall -0 haproxy"

  interval 1

  weight 2

}

vrrp_instance 50 {

  virtual_router_id 50

  advert_int 1

  priority 102

  state MASTER

  interface eth0

  virtual_ipaddress {

    172.16.1.210

  }

  track_script {

    haproxy

  }

authentication {

        auth_type PASS

        auth_pass We$,J)Og&




    }

}

Note :-

We need to enable sysctl setting for no local ip binding allow on the Kernel.

Temporary:

echo 1 > /proc/sys/net/ipv4/ip_nonlocal_bind

Permanent:

Add this to /etc/sysctl.conf:

net.ipv4.ip_nonlocal_bind = 1

Enable with:

sysctl -p

Start service
When our Haproxy setup done, We need to start Keepalived on both servers:

service keepalived start