I got the error ‘ef command not found’ on my CentOS 7 server. ef command on centOS server is provided by ElectricFence package.

ElectricFence (efence malloc debugger) is a debugger which detects memory allocation violations on your Linux Server.

ElectricFence uses the virtual memory of your server to detect when software overruns the boundaries of a malloc() buffer.

Efence can be installed either by using yum command or by downloading the rpm package from CentOS repositories. Do the below steps to install ElectricFence on your CentOS 7 server.

1. Log into Linux Server as ‘root’ user

2. Run the command ‘yum install ElectricFence’ to install ElectricFence on your Linux Server

3. Enter ‘y’ and press enter, if yum ask for confirmation while installing

 

 
 

How to download and install ElectricFence rpm

 
1. You must log into CentOS 7 server as ‘root’ user

2. Search the rpm file of ElectricFence in rpmfind.net website

https://rpmfind.net/linux/rpm2html/search.php?query=ElectricFence
 

3. Download the rpm file using wget command

# wget https://rpmfind.net/linux/centos/7.6.1810/os/x86_64/Packages/ElectricFence-2.2.2-39.el7.i686.rpm
 

4. Install the rpm file downloaded

# rpm -Uvh ElectricFence-2.2.2-39.el7.i686.rpm
 

5. To verify, just type ‘ef’ on the terminal

# ef
/usr/bin/ef: Usage: ef [executable] [arguments].
Runs the executable under the Electric Fence malloc debugger.