How To Install Zenoss on CentOS 6

In this tutorial, we will show you how to install Zenoss on CentOS 6. For those of you who didn’t know, Zenoss is a free and open-source monitoring solution similar to Nagios. Zenoss Core provides a web interface that allows system administrators to monitor availability, inventory/configuration, performance, and other events. The main advantage of Zenoss is that you don’t need to install any software on the client-side for monitoring.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple. I will show you the step-by-step installation of Zenoss on CentOS 6.

Prerequisites

• A server running one of the following operating systems: CentOS 6.
• It’s recommended that you use a fresh OS install to prevent any potential issues.
• SSH access to the server (or just open Terminal if you’re on a desktop).
• A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Install Zenoss on CentOS 6

Step 1. First, Install Java and make sure JAVA_HOME is set appropriately.

Download the latest Oracle-Sun Java RPM from Java Downloads and transfer it to your server.

wget -O jre-6u31-linux-x64-rpm.bin \ http://javadl.sun.com/webapps/download/AutoDL?BundleId=59622
chmod +x ./jre-6u31-linux-x64-rpm.bin
./jre-6u31-linux-x64-rpm.bin
export JAVA_HOME=/usr/java/default

Check and verify the Java version:

java -version

Step 2. Disable SELinux.

Disable enforcing mode permanently by editing the /etc/selinux/config.

SELINUX=disabled

Step 3. Install the Zenoss Dependencies Repository.

This RPM installs Zenoss Dependency Repository. It will help us resolve all of the dependencies required to install and run Zenoss.

rpm -Uvh http://deps.zenoss.com/yum/zenossdeps-4.2.x-1.el6.noarch.rpm

Step 4. Install Latest MySQL Server.

We can install MySQL Community Server and Zenoss Core on the same host or we can install them on separate hosts. In my case, I am using the Same Host. Do Not set the MySQL root password.

wget ftp://ftp.sunet.se/pub/databases/relational/mysql/Downloads/MySQL-5.5/MySQL-client-5.5.33-1.el6.x86_64.rpm
wget ftp://ftp.sunet.se/pub/databases/relational/mysql/Downloads/MySQL-5.5/MySQL-server-5.5.33-1.el6.x86_64.rpm
wget ftp://ftp.sunet.se/pub/databases/relational/mysql/Downloads/MySQL-5.5/MySQL-shared-5.5.33-1.el6.x86_64.rpm

Install the packages with the command:

yum -y --nogpgcheck localinstall MySQL*

Make sure to set the following parameters in your /etc/my.cnf file after the MySQL installation.

#nano /etc/my.cnf

[mysqld]
max_allowed_packet=16M
innodb_buffer_pool_size=256M
innodb_additional_mem_pool_size=20M

Start MySQL daemon and configure it to start automatically on reboot:

/etc/init.d/mysql start
chkconfig mysql on

Configure Mysql for Zenoss Core installation, Do not add a space between the single quotes in the following commands:

mysqladmin -u root password ''
mysqladmin -u root -h localhost password ''

Step 5. Install Zenoss using YUM.

wget http://downloads.sourceforge.net/project/zenoss/zenoss-4.2/zenoss-4.2.5/zenoss_core-4.2.5-2108.el6.x86_64.rpm
yum localinstall zenoss_core-4.2.5-2108.el6.x86_64.rpm

Now Start the following Services:

/etc/init.d/memcached start ; chkconfig memcached on
/etc/init.d/rabbitmq-server start ; chkconfig rabbitmq-server on 
/etc/init.d/snmpd start ; chkconfig snmpd on
/etc/init.d/zenoss start ; chkconfig zenoss on

Important: When you install Zenoss core rpm as shown in the above step, you might get lot of missing dependencies messages. You have to install all of those missing packages one by one.

Step 5. Access Zenoss via a web browser.

http://ip_address_or_hostname:8080

Congratulations! You have successfully installed Zenoss. Thanks for using this tutorial for installing Zenoss on centos 6 systems. For additional help or useful information, we recommend you check the official Zenoss website.

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