CentOS 7
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OpenShift Origin 3.7 : Install2018/02/07

Install OpenShift Origin which is the Open Source version of Red Hat OpenShift.
This example is based on the environment like follows.
           |                    |                    |
+----------+-----------+      +----------+-----------+      +----------+-----------+
|  [  dlp.srv.world ]  |      | [ node01.srv.world ] |      | [ node02.srv.world ] |
|     (Master Node)    |      |    (Compute Node)    |      |    (Compute Node)    |
|     (Compute Node)   |      |                      |      |                      |
+----------------------+      +----------------------+      +----------------------+

There are some System requirements to configure cluster.
  * Master node has up to 16G memory.
  * On all nodes, free space on physical volume is required to create a new volume group for Docker Direct LVM.
[1] On All Nodes, Create a user for installation to be used in Ansible and also grant root privileges to him.
[root@dlp ~]#
useradd origin

[root@dlp ~]#
passwd origin

[root@dlp ~]#
echo -e 'Defaults:origin !requiretty\norigin ALL = (root) NOPASSWD:ALL' | tee /etc/sudoers.d/openshift

[root@dlp ~]#
chmod 440 /etc/sudoers.d/openshift

# if Firewalld is running, allow SSH

[root@dlp ~]#
firewall-cmd --add-service=ssh --permanent

[root@dlp ~]#
firewall-cmd --reload

[2] On All Nodes, install OpenShift Origin 3.7 repository and Docker.
Next, create a volume group for Docker Direct LVM to setup LVM Thinpool like follows.
[root@dlp ~]#
yum -y install centos-release-openshift-origin37 docker
[root@dlp ~]#
vgcreate vg_origin01 /dev/sdb1

Volume group "vg_origin01" successfully created
[root@dlp ~]#
echo VG=vg_origin01 >> /etc/sysconfig/docker-storage-setup

[root@dlp ~]#
systemctl start docker

[root@dlp ~]#
systemctl enable docker

[3] On Master Node, login with a user created above and set SSH keypair with no pass-phrase.
[origin@dlp ~]$
ssh-keygen -q -N ""

Enter file in which to save the key (/home/origin/.ssh/id_rsa):
[origin@dlp ~]$
vi ~/.ssh/config
# create new ( define nodes )

Host dlp
    Hostname dlp.srv.world
    User origin
Host node01
    Hostname node01.srv.world
    User origin
Host node02
    Hostname node02.srv.world
    User origin

[origin@dlp ~]$
chmod 600 ~/.ssh/config
# transfer public-key to another node

[origin@dlp ~]$
ssh-copy-id node01

origin@node01.srv.world's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'node01'"
and check to make sure that only the key(s) you wanted were added.

[origin@dlp ~]$
ssh-copy-id node02

[4] On Master Node, login with a user created above and run Ansible Playbook for setting up OpenShift Cluster.
[origin@dlp ~]$
sudo yum -y install atomic-openshift-utils
[origin@dlp ~]$
sudo vi /etc/ansible/hosts
# add follows to the end


# admin user created in previous section

# use HTPasswd for authentication
openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/.htpasswd'}]

# allow unencrypted connection within cluster

dlp.srv.world openshift_schedulable=true containerized=false


# set labels [region: ***, zone: ***] (any name you like)
dlp.srv.world openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
node01.srv.world openshift_node_labels="{'region': 'primary', 'zone': 'east'}" openshift_schedulable=true
node02.srv.world openshift_node_labels="{'region': 'primary', 'zone': 'west'}" openshift_schedulable=true

[origin@dlp ~]$
ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/byo/config.yml


PLAY RECAP *********************************************************************
dlp.srv.world              : ok=638  changed=265  unreachable=0    failed=0
localhost                  : ok=12   changed=0    unreachable=0    failed=0
node01.srv.world           : ok=187  changed=66   unreachable=0    failed=0
node02.srv.world           : ok=187  changed=67   unreachable=0    failed=0

INSTALLER STATUS ***************************************************************
Initialization             : Complete
Health Check               : Complete
etcd Install               : Complete
Master Install             : Complete
Master Additional Install  : Complete
Node Install               : Complete
Hosted Install             : Complete
Service Catalog Install    : Complete

# show state

[origin@dlp ~]$
oc get nodes

NAME               STATUS    AGE       VERSION
dlp.srv.world      Ready     10m       v1.7.6+a08f5eeb62
node01.srv.world   Ready     10m       v1.7.6+a08f5eeb62
node02.srv.world   Ready     10m       v1.7.6+a08f5eeb62

# show state with labels

[origin@dlp ~]$
oc get nodes --show-labels=true

dlp.srv.world      Ready  10m v1.7.6+... beta.kuber...openshift-infra=apiserver,region=infra,zone=default
node01.srv.world   Ready  10m v1.7.6+... beta.kuber...hostname=node01.srv.world,region=primary,zone=east
node02.srv.world   Ready  10m v1.7.6+... beta.kuber...hostname=node02.srv.world,region=primary,zone=west
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