OpenShift Installation: Difference between revisions
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* [[Docker_Installation|Install Docker]] | * [[Docker_Installation|Install Docker]] | ||
* 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. | ||
From the master, as root: | |||
<pre> | |||
# ssh-keygen | |||
# ssh-copy-id root@node1.example.com | |||
</pre> | |||
=Run CLI to Install= | =Run CLI to Install= | ||
Revision as of 00:31, 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.
DNS Setup
A 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:
- git
- net-tools
- bind-utils
- iptables-services
Manage services:
- Turn off firewalld and configure the iptables service
- Install Docker
- 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
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.