[Linux] Install keepalived on CentOS

Installing

Although installing keepalived through yum is quite convenient, the package is often out-of-date.

So it is recommended to install it from source code. To do so, you can follow the instructions here.

If you already installed it through yum, you can upgrade to a new version by
1. Download the source code from official website
2. Extract the files via tar xvf <package_name>
3. Change the working directory to the extracted folder
4. Run ./configure
5. Run make && make install

You will notice that the newer version of keepalived is installed under /usr/local/sbin and the system is still using the old version located at /usr/sbin

So, you need to

• rename the old one

mv /usr/sbin/keepalived /usr/sbin/keepalived.old

• create a symbolic link for the new one

ln -s /usr/local/sbin/keepalived /usr/sbin/

Configuring

The configuration needed to get it working is simple, just reference the previous link.

Attention
If you have firewalld running, you will need to add the following rule in order to permit the vrrp control traffic.

firewall-cmd --zone=public --add-rich-rule='rule family="ipv4" destination address="224.0.0.18" protocol value="ip" accept' --permanent