corosync?和openais?各自都能實現群集功能，但是功能比較簡單，要想實現功能齊全、復雜的群集，需要將兩者結合起來.corosync?和openais?各自都能實現群集功能，但是功能比較簡單，要想實現功能齊全、復雜的群集，需要將兩者結合起來。二者主要提供心跳探測，但是沒有資源管理能力。pacemaker?可以提供資源管理能力，是從heartbeat的v3版本中分離出來的一個項目.

高可用群集要求：

硬件一致性

軟件（系統）一致性

時間一致性

拓撲結構：

節點一：ip?：192.168.10.1/24

節點二：ip?：192.168.10.2/24

1、修改主機名

[root@node1?~]#?vim?/etc/sysconfig/network

NETWORKING=yes

NETWORKING_IPV6=no

HOSTNAME=node1.a.com

2.要求兩個節點可以相互解析。

[root@node1?~]#?vim?/etc/hosts

192.168.10.1?node1.a.com

192.168.10.2?node2.a.com

[root@node2?~]#?vim?/etc/sysconfig/network

NETWORKING=yes

NETWORKING_IPV6=no

HOSTNAME=node2.a.com

[root@node2?~]#?vim?/etc/yum.repos.d/rhel-debuginfo.repo

[rhel-server]

name=Red?Hat?Enterprise?Linux?server

baseurl=file:///mnt/cdrom/Server/

enabled=1

gpgcheck=1

gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release

[rhel-cluster]

name=Red?Hat?Enterprise?Linux?server

baseurl=file:///mnt/cdrom/Cluster/

enabled=1

gpgcheck=1

gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release

#?mkdir?/mnt/cdrom

#?mount?/dev/cdrom?/mnt/cdrom/

3.配制yum源

[root@node1?~]#?vim?/etc/yum.repos.d/rhel-debuginfo.repo

[rhel-server]

name=Red?Hat?Enterprise?Linux?server

baseurl=file:///mnt/cdrom/Server/

enabled=1

gpgcheck=1

gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release

[rhel-cluster]

name=Red?Hat?Enterprise?Linux?server

baseurl=file:///mnt/cdrom/Cluster/

enabled=1

gpgcheck=1

gpgkey=file:///mnt/cdrom/RPM-GPG-KEY-redhat-release

4.使兩個節點的時鐘相同，在兩個節點上執行以下命令

#hwclock?-s????

利用公鑰使兩個節點間實現無障礙通信

node1產生自己的密鑰對：

[root@node1?~]#?ssh-keygen?-t?rsa?

Generating?public/private?rsa?key?pair.

Enter?file?in?which?to?save?the?key?(/root/.ssh/id_rsa):?

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:

[root@node1?~]#?cd?/root/.ssh

[root@node1?.ssh]#?ll

總計?32

-rw-------?1?root?root??398?01-22?14:38?authorized_keys

-rw-------?1?root?root?1675?01-22?14:26?id_rsa

-rw-r--r--?1?root?root??398?01-22?14:26?id_rsa.pub

-rw-r--r--?1?root?root??406?01-22?13:59?known_hosts

5.Node2產生自己的密鑰對：

[root@node2?~]#?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:

5c:e5:4a:fa:b3:ce:ca:5a:b8:bb:fd:1a:fe:1a:e9:76?root@node2.a.com

6.將兩個節點的公鑰文件拷貝到對方，此過程需要對方的登錄密碼

[root@node1?~]#?cd?/root/.ssh/

[root@node1?.ssh]#?ssh-copy-id?-i?id_rsa.pub?node2

ssh:?node2:?Temporary?failure?in?name?resolution

[root@node1?.ssh]#?ssh-copy-id?-i?id_rsa.pub?node2.a.com

root@node2.a.com's?password:?

[root@node1?.ssh]#?scp?/etc/hosts?node2.a.com:/etc

在node1上執行node2上的命令。 文字較多，添加附件如下：

轉載于:https://blog.51cto.com/dg123/1129429

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