Specifications

3
Chapter 2. Installing on RHEL or
CentOS
This chapter provides detailed instructions for installing Zenoss Core on RHEL or CentOS systems, versions 5 and 6.
Before installing Zenoss Core, you must:
• Ensure your system meets all requirements.
• Install prerequisite software and packages, as outlined in this chapter.
Important! This chapter may not define all prerequisite packages for your installation options. While installing one
or more software packages, you may be prompted to install additional, prerequisite software. Zenoss recommends
that you install that software as directed.
Unless otherwise directed, perform all steps as the root user.
2.1. Requirements
Ensure that your system meets all hardware requirements, and that you have correctly configured your operating system
and hard drive partitions.
In addition, make sure that:
• You have disabled SELinux
• The /opt/zenoss directory is not a symbolic link to another location
• The umask is set to 022 (masks write permissions for group and others)
• The /home directory is writable by root, or the /home/zenoss directory exists as the zenoss user home directory
• You are connected to the Internet
• DNS is accessible
2.2. Tasks
Before installing Zenoss Core, you must:
• Configure your firewall
• Remove outdated packages
• Remove conflicting messaging systems
• Install and configure software repositories, prerequisite software, and additional packages
2.3. Configure Your Firewall
Zenoss Core requires these ports be open in your firewall:
Port Protocol Direction to Zenoss
Core Server
Description
11211 TCP | UDP Inbound memcached