Install Zenoss on CentOS 6 64bit

zenoss-3Minimal Hardware Requirements:

Small Deployments (1 to 250 Monitored Devices)

  • 4GB RAM
  • 2 CPU Cores
  • 1x 300GB, 10K RPM Drive

Medium Deployments (250 to 500 Monitored Devices)

  • 8GB RAM
  • 4 CPU Cores
  • 1x 300GB, 10K RPM Drive

Large Deployments (500 to 1000 Monitored Devices)

  • 16GB – 32GB RAM
  • 8 CPU Cores
  • 1x 300GB, 15K RPM Drive

Disable SELinux and IPtables

For this guide SELinux and IPtables were completely disabled and CentOS 6 was up-to-date!

Add DNS FQDN Entry and NTP Sync

To ensure proper resolving FQDN entries in DNS or /etc/hosts must exist and please configure NTP time synchronization for services to run properly.

Install Following Packages

Install the following packages to make your life a bit easier – especially if you are on CentOS 6 minimal install

[root@centos1 ~]# yum install openssh-clients wget vim-enhanced

Install Zenoss Dependencies Repository

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

[root@centos1 ~]# rpm -ivh

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 \
chmod +x ./jre-6u31-linux-x64-rpm.bin
export JAVA_HOME=/usr/java/default

Alternatively, you can download Java from here-

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.


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


Start mysql daemon and to 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 ''

Download and Install Latest Zenoss RPM

Download latest Zenoss RPM to your server and install it via “yum” to resolve dependencies.

[root@centos1 ~]# wget
[root@centos1 ~]# yum localinstall zenoss_core-4.2.5-2108.el6.x86_64.rpm

Start Zenoss for the First Time

Zenoss first run might take some time. Zenoss has to populate the database and install ZenPacks, please be patient…

[root@centos1 ~]# /etc/init.d/zenoss start
Zenoss not initialized. Performing first-boot initialization…
Fresh install pre steps
Checking RRDtool version >= 1.4.7: [ OK ] 1.4.7
Dropping database: zodb_session
Creating database: zodb_session
Applying schema version: 1
Applying schema version: 2
Applying schema version: 3
Dropping database: zodb
Creating database: zodb
Applying schema version: 1
Applying schema version: 2
Applying schema version: 3
Creating database: zenoss_zep
Applying schema version: 1
Applying schema version: 2
Applying schema version: 3
Applying schema version: 4
Applying schema version: 5
Applying schema version: 6
make zope instance.
Loading initial Zenoss objects into the Zeo database
(this can take a few minutes)
Zenoss initialization complete.
Daemon: zeneventserver starting…
Waiting for zeneventserver to start………………..
2014-07-08 10:09:33,487 INFO zen.ZPLoader: Loading /opt/zenoss/ZenPacks/ZenPacks.zenoss.ApacheMonitor-2.1.4-py2.7.egg/ZenPacks/zenoss/ApacheMonitor/objects/objects.xml
2014-07-08 10:09:33,589 INFO zen.AddToPack: End loading objects
2014-07-08 10:09:33,589 INFO zen.AddToPack: Processing links

Zenpacks were installed. Restarting zenoss.
Daemon: zredis stopping…
already stopped
Daemon: zenprocess stopping…
already stopped
Daemon: zencommand stopping…
already stopped
Daemon: zenperfsnmp stopping…
already stopped
Daemon: zenmodeler stopping…
already stopped
Daemon: zentrap stopping…
already stopped
Daemon: zenactiond stopping…
already stopped
Daemon: zenstatus stopping…
already stopped
Daemon: zensyslog stopping…
already stopped
Daemon: zenping stopping…
already stopped
Daemon: zeneventd stopping…
already stopped
Daemon: zenjobs stopping…
already stopped
Daemon: zenhub stopping…
already stopped
Daemon: zenrrdcached stopping…
already stopped
Daemon: zopectl daemon manager not running
Daemon: zeneventserver stopping…
Daemon: zeneventserver starting…
Waiting for zeneventserver to start……..
Daemon: zopectl .
daemon process started, pid=10380
Daemon: zenrrdcached starting…
Daemon: zenhub starting…
Daemon: zenjobs starting…
Daemon: zeneventd starting…
Daemon: zenping starting…
Daemon: zensyslog starting…
Daemon: zenstatus starting…
Daemon: zenactiond starting…
Daemon: zentrap starting…
Daemon: zenmodeler starting…
Daemon: zenperfsnmp starting…
Daemon: zencommand starting…
Daemon: zenprocess starting…
Daemon: zredis starting…
Daemon: zenpython starting…
Daemon: zenjmx starting…

Fresh install post step
--2014-07-08 10:19:06--
Connecting to||:8080... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: “/dev/null”

0K ………. 61.2 =2m56s

2014-07-08 10:22:34 (61.2 B/s) – “/dev/null” saved [10772]

Zenoss installation completed.


If starting Zenoss fails with “Failed starting rabbitmq — exiting!” please add a line to /etc/hosts with the IP address of the Zenoss server and FQDN and try starting Zenoss again!
If when you visit web URL only see HTML only output something went wrong at the first time Zenoss run. Please remove Zenoss “yum remove zenoss-4.2.5-2108.el6.x86_64”, reinstall RPM “yum localinstall zenoss_core-4.2.5-2108.el6.x86_64.rpm” and run Zenoss again for the first time.
UPDATE: Thanks to GeekPeek.Net visitor Sujith if you are having problems when accessing the login page for the first time (HTML only view) you can get it resolved by using script from the link HERE.

Make Services Start at Boot

[root@centos1 ~]# chkconfig mysqld on
[root@centos1 ~]# chkconfig zenoss on
[root@centos1 ~]# chkconfig postfix on

Client Configuration

There are a few things we will configure to give us a useful environment for Zenoss to manage.

We will configure two “client” machines that the Zenoss machine will monitor. Our clients will be running Ubuntu 12.04 on small VPS instances.

SNMP Client Configuration
On one of the Ubuntu installations, we will install an SNMP daemon, which will allow Zenoss to gather information about the client. On one client, type the following command:

sudo apt-get update
sudo apt-get install snmpd

After installation, we need to configure the daemon. First, we will go to the configuration directory and move the default configuration file:

cd /etc/snmp/
sudo mv snmpd.conf snmpd.conf.bak

Now, we can create a new, simplified configuration file as root:

sudo nano snmpd.conf

Copy and paste the following line into the configuration file:

rocommunity public

Save and close the file.

Now that we have configured the SNMP daemon, we need to restart the service to implement our changes:

sudo service snmpd restart

The client will now respond to polling requests.

SSH Client Configuration

For the other client, we will allow Zenoss to run information gathering commands remotely via SSH.

We do the configuration for this on the Zenoss machine, not the SSH client machine.

Begin by logging into the zenoss user and creating an RSA key:

su - zenoss
ssh-keygen -t rsa

Press “enter” to accept the defaults and use no passphrase.

Next, we will copy the SSH key to our SSH client computer. Change the username and IP address to reflect your SSH client machine’s configuration:

ssh-copy-id username@SSH.Client.IP.Address

You will be asked to authenticate with the remote machine via password, and then it will add your key to the remote server.

Test your ability to log in without a password by typing:

ssh username@SSH.Client.IP.Address

If you are successful, type “exit” to get back to the Zenoss machine:

Type “exit” again to get back to the root shell:




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