ip_vs module is not present
I found out that ip_vs module is not present on the kernel. How can I make it present?
You can install ip_vs on your Linode. You'll need to use your distro's package manager to install ipvsadm - for example,
apt-get install ipvsadm for Debian and Ubuntu, or
yum install ipvsadm for CentOS. After that, you can run the command
These instructions were found in this StackExchange thread.