CentOS 7
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OpenShift Origin 3.6 : Install
2017/11/23
 
Install OpenShift Origin which is the Open Source version of Red Hat OpenShift.
This example is based on the environment like follows. 
-----------+-----------------------------------------------------------+------------
           |10.0.0.30                    |10.0.0.51                    |10.0.0.52
+----------+-----------+      +----------+-----------+      +----------+-----------+
|  [  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 3.6 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-origin36 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

[OSEv3:children]
masters
nodes

[OSEv3:vars]
# admin user created in previous section
ansible_ssh_user=origin
ansible_become=true
openshift_deployment_type=origin

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

# allow unencrypted connection within cluster
openshift_docker_insecure_registries=172.30.0.0/16

[masters]
dlp.srv.world openshift_schedulable=true containerized=false

[etcd]
dlp.srv.world

[nodes]
# 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 

2017-11-23 19:17:14,120 p=1889 u=root |  PLAY [Create initial host groups for localhost] 
2017-11-23 19:17:14,127 p=1889 u=root |  TASK [include_vars] ****************************

................
................

PLAY RECAP *********************************************************************
dlp.srv.world              : ok=643  changed=177  unreachable=0    failed=0
localhost                  : ok=12   changed=0    unreachable=0    failed=0
node01.srv.world           : ok=246  changed=66   unreachable=0    failed=0
node02.srv.world           : ok=246  changed=66   unreachable=0    failed=0
# show state

[origin@dlp ~]$
oc get nodes 

NAME               STATUS    AGE       VERSION
dlp.srv.world      Ready     19m       v1.6.1+5115d708d7
node01.srv.world   Ready     19m       v1.6.1+5115d708d7
node02.srv.world   Ready     19m       v1.6.1+5115d708d7
# show state with labels

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

NAME             STATUS AGE  VERSION      LABELS
dlp.srv.world    Ready  28m  v1.6.1+...   beta.kuber...hostname=dlp.srv.world,region=infra,zone=default
node01.srv.world Ready  28m  v1.6.1+...   beta.kuber...hostname=node01.srv.world,region=primary,zone=east
node02.srv.world Ready  28m  v1.6.1+...   beta.kuber...hostname=node02.srv.world,region=primary,zone=west
 
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