---
title: Openshift: Add Nodes to a Cluster
url: https://devopstales.github.io/kubernetes/openshift-add-node/
date: 2019-06-27
keywords: ansible, openshift 3.11, openshift okd, openshift tutorial, openshift container platform, rad hat openshift
---



Add Nodes to an existing Cluster.

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{{< content "/filedir/openshift.html" >}}

In the last post I used the basic htpasswd authentication method for the installatipn.<br>
But I can use Ansible-openshift to configure an LDAP backed at the install for the authentication.

### Environment
```
192.168.1.40    deployer
192.168.1.41    openshift01 # master node
192.168.1.42    openshift02 # infra node
192.168.1.43    openshift03 # worker node
192.168.1.44    openshift04 # new-worker node
192.168.1.45    openshift00 # new-master node
```

###
```
useradd origin
passwd origin
echo -e 'Defaults:origin !requiretty\norigin ALL = (root) NOPASSWD:ALL' | tee /etc/sudoers.d/openshift
chmod 440 /etc/sudoers.d/openshift

# if Firewalld is running, allow SSH

firewall-cmd --add-service=ssh --permanent
firewall-cmd --reload

yum -y install centos-release-openshift-origin36 docker
vgcreate vg_origin01 /dev/sdb1

Volume group "vg_origin01" successfully created
echo VG=vg_origin01 >> /etc/sysconfig/docker-storage-setup
systemctl start docker
systemctl enable docker
```

### Configurate Installer
```
nano /etc/ansible/hosts
# add into OSEv3 section

[OSEv3:children]
masters
nodes
new_nodes
new_masters
new_etcd

[new_nodes]
openshift04.devopstales.intra openshift_node_group_name='node-config-compute'
openshift00.devopstales.intra openshift_node_group_name='node-config-master'

[new_masters]
openshift00.devopstales.intra openshift_node_group_name='node-config-master'

[new_etcd]
openshift00.devopstales.intra containerized=true
```

### Run the Installer
Run Ansible Playbook for scaleout the Cluster.
```
# deployer
cd /usr/share/ansible/openshift-ansible/

ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-node/scaleup.yml
ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-master/scaleup.yml
ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/openshift-etcd/scaleup.yml
```

### Configurate Installer
After finishing to add new Nodes, Open [/etc/ansible/hosts] again and move new definitions to existing [nodes] section like follows.
```
nano /etc/ansible/hosts
# add into OSEv3 section

[OSEv3:children]
masters
nodes
new_nodes
new_masters

[nodes]
openshift00.devopstales.intra openshift_node_group_name='node-config-master'
openshift01.devopstales.intra openshift_node_group_name='node-config-master'
openshift02.devopstales.intra openshift_node_group_name='node-config-infra'
openshift03.devopstales.intra openshift_node_group_name='node-config-compute'
openshift04.devopstales.intra openshift_node_group_name='node-config-compute

[new_nodes]

[masters]
openshift00.devopstales.intra openshift_node_group_name='node-config-master'
openshift01.devopstales.intra openshift_node_group_name='node-config-master'

[new_masters]

[etcd]
openshift01.devopstales.intra containerized=true
openshift00.devopstales.intra containerized=true

[new_etcd]
```