Openshift 3.11 installation on AWS Cloud

This repository explains the steps of installing Openshift 3.11 with AWS Cloud configurations.

Ports required for Openshift Cluster

Open ports on the network which will be used to setup Openshift Cluster.

22 			TCP
53 or 8053		TCP/UDP
80 or 443		TCP
1936			TCP
4001			TCP
2379 and 2380		TCP
4789			UDP
8443			TCP
10250			TCP

To get more details understanding on ports for Openshift, refer this link https://docs.openshift.com/container-platform/3.11/install/prerequisites.html

Install Openshift 3.11 on CentOS

Provision 'n' number of nodes. In this example, I created 3 CentOS nodes on AWS. You need to make necessary changes to be able to login on CentOS with 'root' user account.

Common steps taken on all the nodes:

sudo vi /etc/ssh/sshd_config
    PermitRootLogin yes    	#Uncomment this line in /etc/ssh/sshd_config and save it.
sudo systemctl restart sshd

By default IAM doesn't allow to login with root user on EC2 instances but you can use the authroized_keys of centos user to access it.

sudo -s
cp /home/centos/.ssh/authorized_keys /root/.ssh/authorized_keys

yum install -y git
git clone https://github.com/arunvdsharma/openshift-centos.git
cd openshift-centos

chmod +x install-tools.sh
./install-tools.sh

Exit from the nodes but master.

Ensure you have the right inventory.ini file with AWS configurations in it. Check if that file has below properties

openshift_cloudprovider_aws_access_key=AWS_ACCESS_KEY
openshift_cloudprovider_aws_secret_key=AWS_SECRET_KEY
openshift_clusterid=openshift
openshift_cloudprovider_kind=aws

If you want to configuration S3 to store the volumes, add below properties

openshift_hosted_manage_registry=true
openshift_hosted_registry_storage_kind=object
openshift_hosted_registry_storage_provider=s3
openshift_hosted_registry_storage_s3_accesskey=AWS_ACCESS_KEY
openshift_hosted_registry_storage_s3_secretkey=AWS_SECRET_KEY
openshift_hosted_registry_storage_s3_bucket=openshift-bucket-aruns
openshift_hosted_registry_storage_s3_region=ap-south-1a
openshift_hosted_registry_storage_s3_chunksize=26214400
openshift_hosted_registry_storage_s3_rootdirectory=/registry
openshift_hosted_registry_pullthrough=true
openshift_hosted_registry_acceptschema2=true
openshift_hosted_registry_enforcequota=true
openshift_hosted_registry_replicas=3

Note:

Every master host, node host, and subnet must have the tags defined as below format 
    
    e.g. kubernetes.io/cluster/<clusterid>,Value=(owned|shared)

One security group, preferably the one linked to the nodes, must have the 
    
    kubernetes.io/cluster/<clusterid>,Value=(owned|shared) tag

Installation of Openshift AWS on Master node

chmod +x install-openshift.sh
./install-openshift.sh