OpenShift实战(二)：OpenShift节点扩容

1、新增节点信息

　　增加节点如下，请将xxx改为自己的域名

node6.xxx.net	Node	192.168.8.90	8G	20G/60G	4C
node7.xxx.net	Node	192.168.8.91	8G	20G/60G	4C

2、基本配置

　　关闭Firewalld

[root@node6 ~]# systemctl stop firewalld
[root@node6 ~]# systemctl disabled firewalld
Unknown operation 'disabled'.
[root@node6 ~]# systemctl disable firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

　　更改所有节点hosts

192.168.10.110 master1.xxx.net
192.168.10.112 node1.xxx.net
192.168.10.113 node2.xxx.net
192.168.10.116 node3.xxx.net
192.168.10.114 node4.xxx.net
192.168.10.117 node5.xxx.net
192.168.10.109 etcd1.xxx.net
192.168.10.111 etcd2.xxx.net
192.168.10.115 etcd3.xxx.net
192.168.8.90 node6.xxx.net
192.168.8.91 node7.xxx.net

　　Master1节点SSH互信

[root@master1 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:yFOKV/QRdQoxQ12uW8v0UWmpLcrxDQo8VNyVEuRWHlE root@master1.xxx.net
The key's randomart image is:
+---[RSA 2048]----+
|        ..X*++==E|
|       . ..*o*o.+|
|        o.. .oo=.|
|     o =o   ..+ .|
|    . * S+ ..+oo |
|     . .  + ==+o.|
|           +..o..|
|                 |
|                 |
+----[SHA256]-----+

for i in node6.xxx.net node7.xxx.net;do ssh-copy-id -i ~/.ssh/id_rsa.pub $i;done

　　所有节点更改时区并同步时间

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
ntpdate time.windows.com

　　所有节点安装基本环境

yum install wget git net-tools bind-utils iptables-services bridge-utils bash-completion kexec-tools sos psacct vim -y

　　# 剩余步骤与之前一致,参考上一篇文档

　　master1更改/etc/ansible/hosts

# Create an OSEv3 group that contains the masters, nodes, and etcd groups
[OSEv3:children]
masters
nodes
etcd
new_nodes
#lb
# Set variables common for all OSEv3 hosts
[OSEv3:vars]
# SSH user, this user should allow ssh based auth without requiring a password
ansible_ssh_user=root
ansible_become=yes
debug_level=2
openshift_deployment_type=origin
# If ansible_ssh_user is not root, ansible_become must be set to true
#ansible_become=true
openshift_repos_enable_testing=true
openshift_enable_service_catalog=false
template_service_broker_install=false
# uncomment the following to enable htpasswd authentication; defaults to DenyAllPasswordIdentityProvider
openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true', 'challenge': 'true', 'kind': 'HTPasswdPasswordIdentityProvider', 'filename': '/etc/origin/master/htpasswd'}]
openshift_disable_check=disk_availability,docker_storage,memory_availability,docker_image_availability,package_version
# config for metrics
openshift_release=3.6.1
openshift_metrics_install_metrics=true
openshift_metrics_cassandra_storage_type=emptydir
openshift_metrics_hawkular_hostname=metrics.xxx.net
openshift_clock_enabled=true
#openshift_master_cluster_method=native
#openshift_master_cluster_hostname=openshift.xxx.net
#openshift_master_cluster_public_hostname=openshift.xxx.net
#openshift_node_kubelet_args={'pods-per-core': ['10'], 'max-pods': ['250'], 'image-gc-high-threshold': ['90'], 'image-gc-low-threshold': ['80']}
# host group for masters
[masters]
master1.xxx.net
#master2.xxx.net

# host group for lb
#[lb]
#lb.xxx.net

# host group for etcd
[etcd]
etcd1.xxx.net
etcd2.xxx.net
etcd3.xxx.net
# host group for nodes, includes region info
[nodes]
master1.xxx.net
#master2.xxx.net
node1.xxx.net openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
node2.xxx.net openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
node3.xxx.net openshift_node_labels="{'region': 'infra', 'zone': 'default'}"
node4.xxx.net
node5.xxx.net 
#
[new_nodes]
node6.xxx.net openshift_node_labels="{'region': 'subnet8', 'zone': 'default'}"
node7.xxx.net openshift_node_labels="{'region': 'subnet8', 'zone': 'default'}"

3、安装　

　　执行安装：

ansible-playbook -i /etc/ansible/hosts /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-node/scaleup.yml

　　安装完成后，新加节点修改docker配置/etc/sysconfig/docker

OPTIONS=' --selinux-enabled  --log-driver=journald --registry-mirror=https://docker.mirrors.ustc.edu.cn --insecure-registry=172.30.0.0/16 --insecure-registry 192.168.10.110:5000'

4、其他组件

　　其他组件如etcd、master节点扩容类似，参考文档：https://docs.openshift.org/3.6/install_config/adding_hosts_to_existing_cluster.html