OpenShift Installation: Difference between revisions
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[[RHEL_7/Centos_7_Installation#Turn_off_firewalld_and_configure_the_iptables_service|Turn off firewalld and configure the iptables service]] | |||
* Make sure master can issue remote commands on the nodes without requiring password. Ansible, who runs the installation process, requires a user that has password-less access to all hosts. | * Make sure master can issue remote commands on the nodes without requiring password. Ansible, who runs the installation process, requires a user that has password-less access to all hosts. | ||
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{{Internal|OpenShift Ports|OpenShift Ports}} | {{Internal|OpenShift Ports|OpenShift Ports}} | ||
=Install Docker= | |||
Install Docker. Generic installation instructions: [[Docker_Installation|Install Docker]]. A Docker that works with OpenShift must be installed from <tt>rhel-7-server-ose-3.2-rpms</tt> and have it running on master and all nodes before installing OpenShift. | |||
<pre> | |||
yum install docker | |||
</pre> | |||
Edit <tt>/etc/sysconfig/docker</tt> and add: | |||
<pre> | |||
OPTIONS=--selinux-enabled --insecure-registry 172.30.0.0/16 | |||
</pre> | |||
--insecure-registry instructs Docker daemon to trust any Docker registry on 172.30.0.0/16 subnet. | |||
=Run CLI to Install= | =Run CLI to Install= | ||
Revision as of 01:15, 3 May 2017
External
Internal
Overview
There are two installation methods: quick install, which uses a CLI tool available in the "atomic-openshift-utils" package, which, in turn, uses Ansible in the background, and advanced install. The advanced install assumes familiarity with Ansible.
Prerequisites
System Requirements
Relevance OpenShift 3.3.
Master
- Physical or virtual system.
- RHEL 7.1 installed with the "minimal" installation option.
- 2 CPUs
- 8 GB RAM
- 30 GB storage space.
Node
- Physical or virtual system.
- RHEL 7.1 installed with the "minimal" installation option.
- 1 CPU
- 8 GB RAM
- 15 GB storage space.
- Docker 1.9.1 or later
- 15 GB to allocated to Docker storage.
External DNS Setup
An external DNS server is required.
After setup, the DNS server needs to be configured to resolve a public wildcard DNS entry to the public IP address of the node that executes the default router, by adding an A record, with a low TTL. If the environment has multiple routers, an external load balancer is required.
*.myapp.example.com. 300 IN A 1.2.3.4
O/S Installation
Execute a minimal installation on one host, and perform the following steps. Then the same image can be used for as a base for the other nodes.
Register all hosts with Red Hat Subscription Manager to RHEL 7.x and OpenShift 3 repositories.
Extra packages required:
yum install wget git net-tools bind-utils iptables-services bridge-utils bash-completion yum update -y
Turn off firewalld and configure the iptables service
- Make sure master can issue remote commands on the nodes without requiring password. Ansible, who runs the installation process, requires a user that has password-less access to all hosts.
From the master, as root:
# ssh-keygen # ssh-copy-id root@node1.example.com
- Configure iptables. iptables must be running and the following ports must be open. Most of the ports will be configured by the installer, automatically - verify that.:
Install Docker
Install Docker. Generic installation instructions: Install Docker. A Docker that works with OpenShift must be installed from rhel-7-server-ose-3.2-rpms and have it running on master and all nodes before installing OpenShift.
yum install docker
Edit /etc/sysconfig/docker and add:
OPTIONS=--selinux-enabled --insecure-registry 172.30.0.0/16
--insecure-registry instructs Docker daemon to trust any Docker registry on 172.30.0.0/16 subnet.
Run CLI to Install
Post-Install
Deploy the Integrated Docker Registry
Deploy the HAProxy Router
Load Image Streams
Load Templates
Set up NFS
The NFS server is required for persistent volumes.