ZENOSS a open source monitoring Tool ....

1.     Introduction

ZENOSS is an award-winning open source IT monitoring product that offers visibility over the entire IT stack, from network devices to applications. Features include automatic discovery, inventory via CMDB, availability monitoring, easy-to-read performance graphs, sophisticated alerting, an easy-to-use web portal, and much, much more.

2.   Installation Steps for ZenosS Core

Basic Pre-requisites for System:

Ø  Internet Connection

Ø  disabled SELinux

Ø  /opt/zenoss directory is not a symbolic link to another location

Ø  umask is set to 022 (masks write permissions for group and others)

Ø  /home directory is writable by root, or the /home/zenoss directory exists as the zenoss user home directory

Ø  DNS is accessible

 

3. Pre-request for Installation of ZENOSS.

          3.1 Before Installation of ZenosS

3.1.1.     Configure  the Firewall 

firewall can be configured and alternatively it can be turned off. So we choose to turn off the firewall for time being.

For IPv4, use these commands:

service iptables stop

chkconfig iptables off

For IPv6, use these commands:

service ip6tables stop

chkconfig ip6tables off 

3.1.2 Remove the Out Dated Package from the System

Zenoss Core requires at least MySQL 5.5.25, and supports later versions through 5.5.31. If you have older versions of MySQL installed, you must first remove those installations. Current data will be lost.

As skipping this step results into a outdated package installed on your server and if you try to upgrade the MySQL server to the version mentioned above without removing the old packages, system will throw an error that MySQL is already present.

1. Stop the MySQL service:

service mysqld stop

2. List the MySQL packages currently installed:

rpm -qa | grep -i mysql

3. Remove all listed packages:

yum erase Package1 Package2 ...

4. If your version of MySQL is earlier than 5.5.25, delete the MySQL directory:

rm -rf /var/lib/mysql

If your version of MySQL is 5.5.25 or a more recent version, DO NOT deletes the MySQL directory.

 

 

3.1.3       Remove the Conflicting Messaging  System.

Zenoss Core relies on the RabbitMQ messaging system. Newer versions of CentOS include alternative messaging systems (Matahari and Qpid). We must remove these messaging systems to run Zenoss Core.

1. Use the following commands to determine if Matahari or Qpid packages are installed on  system:

rpm -qa | egrep -i "matahari|qpid"

2. Remove all listed packages:

yum erase Package1 Package2 ...make all

3.1.4       Install Oracle on System.

1. Zenoss Core is not compatible with OpenJDK Java. To determine whether it is installed, enter the following

command: rpm -qa | grep openjdk

To remove OpenJDK Java, log in as root, and enter the following command:

yum -y remove openjdk-package-name

   Download the latest self-installing RPM of Oracle Java SE Runtime Environment 6u31 from the Java SE 6 Downloads page. The file to download is jre-6u31-linux-x64-rpm.bin.

Note :  Now to download the packages from the external network, check for the network connectivity otherwise you will face following kind of errors :

>>> 

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was14: PYCURL ERROR 7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable"
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again  You could try using --skip-broken to work around the problem

<<< 

Resolution :

So you need to set the http proxy using the export http_proxy command.

For e.g.

----------------------------------------------

export http_proxy=http://username:password@proxy.co.in:8080

----------------------------------------------

Alternative method manually down load the JRE rpm and copy it to the respective zenoss repository location on the system

2. Change mode:

chmod +x ./jre-6u31-linux-x64-rpm.bin

3. Install Oracle JRE:

./jre-6u31-linux-x64-rpm.bin

                Or

rpm –i  jre-6u31-linux-x64-rpm.bin

4. Update JAVA_HOME. Add the following line to the end of the /etc/profile file:

export JAVA_HOME=/usr/java/default/bin

5. Verify the correct installed version (1.6 Update 31):

java –version

If you face any issue like as  mention below :

Error :

-------------------------

Fresh install pre steps

Tue Jul 30 19:17:32 IST 2013

Linux IBM64BIT 2.6.32-220.el6.x86_64 #1 SMP Tue Dec 6 19:48:22 GMT 2011 x86_64 x86_64 x86_64 GNU/Linux

Please update the JRE with the latest version of the JRE.

Example : rpm –U  jre-7.0-linux-x64-rpm.bin

Please confirm that the JRE in the PATH is Oracle's version.

Command: echo $JAVA_HOME

 

3.1.5       Disable SELinux.

Zenoss Core is not compatible with Security-Enhanced Linux (SELinux) in enforcing mode. Follow these steps to disable enforcing mode on the Zenoss Core host.

1. Log in as root, or as a user with super user privileges.

2. Disable enforcing mode temporarily (avoiding the need to reboot) with the following command:

/bin/echo 0 > /selinux/enforce

3. Disable enforcing mode permanently by editing the /etc/selinux/config file with the following command:

/bin/sed -i.bak -e 's/^SELINUX=.*/SELINUX=disabled/g' /etc/selinux/config

3.1.6       Download and install the ZenosS  Dependency repository 

Upgrade the repository for Zenoss dependencies:

RHEL/CentOS 5: rpm -Uvh http://deps.zenoss.com/yum/zenossdeps-4.2.x-1.el5.noarch.rpm

RHEL/CentOS 6: rpm –Uvh  http://deps.zenoss.com/yum/zenossdeps-4.2.x-1.el6.noarch.rpm

 

3.2 Installation and Configuration of MySql Server

Install MySQL Community Server and Zenoss Core on the same host or we can install them on separate hosts.

Follow these steps to download, install, and configure MySQL Community Server:

1. Download the following Red Hat/Oracle Enterprise Linux (x86, 64-bit) RPM Packages from mysql.com/:

• Client Utilities

• MySQL Server

• Shared components

2. Install the packages with the command:

yum -y --nogpgcheck localinstall MySQL*

Important:  When MySQL installation completes, it displays a message similar to "PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !" followed by directions to perform this task.

Do not set the MySQL root user password at this point in the installation process. You must install Zenoss Core before performing this task.

3. Create a file named /etc/my.cnf file, and then add the following lines:

[mysqld]

max_allowed_packet=16M

innodb_buffer_pool_size=256M

innodb_additional_mem_pool_size=20M

4. Run these commands to start the mysql daemon and to configure it to start automatically on reboot:

service mysql start

chkconfig --add mysql

chkconfig --level 2345 mysql on

5. 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 ''

 

4.            Installation for ZENOSS.

Down load the Installation rpm  from the mention location

http://community.zenoss.org/community/download

 

Install rpm of ZenosS

 RHEL/CentOS 5:

yum -y --nogpgcheck localinstall zenoss_core-version.el5.x86_64.rpm

RHEL/CentOS 6

yum -y --nogpgcheck localinstall zenoss_core-version.el6.x86_64.rpm

Configure required services to start when the host starts, and start the services:

for svc in memcached rabbitmq-server snmpd do chkconfig $svc on service $svc start done

 

When the Zenoos Successfully installed, you will see the below message on the console output .

 

Or you can verify all process related to zenoss are running by using the ps command.

[root@IBM64BIT log]# service zenoss status