Corosync + Pacemaker 搭建高可用Httpd服务

实验描述

1.两个测试节点，分别为node5.redhat.com和node6.redhat.com地址分别为172.16.100.5和172.16.100.6
2.集群服务为httpd，利用nfs做共享存储，NFS地址为172.16.0.254，NFS已经共享出了一个/www/htdocs目录并且里面有index.html文件。
3.VIP地址为172.16.100.100
4.两个节点系统全部为CentOS7.2
5.由于本人还需要上班，所以时间紧张，描述的有点马虎，请多见谅。如有错误的地方，还请提出改正。

配置步骤

1.在所有节点安装pcs，并启动相应的pcsd进程

[[email protected] ~]# yum install pcs -y
[[email protected] ~]# systemctl start pcsd.service

[[email protected] ~]# yum install pcs -y
[[email protected] ~]# systemctl start pcsd.service

2.给所有节点上的hacluster用户设置一个密码。

[[email protected] ~]# echo “redhat” | passwd –stdin hacluster

[[email protected] ~]# echo “redhat” | passwd –stdin hacluster

3.在一个节点上验证两个节点

[[email protected] ~]# pcs cluster auth node5.redhat.com node6.redhat.com
Username: hacluster
Password: 这里输入的密码默认不会显示
node5.redhat.com: Authorized
node6.redhat.com: Authorized

4.将两个节点加入集群

[[email protected] ~]# pcs cluster setup –name mycluster node5.redhat.com node6.redhat.com
添加节点的输出信息
Shutting down pacemaker/corosync services…
Redirecting to /bin/systemctl stop pacemaker.service
Redirecting to /bin/systemctl stop corosync.service
Killing any remaining services…
Removing all cluster configuration files…
node5.redhat.com: Succeeded
node6.redhat.com: Succeeded
Synchronizing pcsd certificates on nodes node5.redhat.com, node6.redhat.com…
node5.redhat.com: Success
node6.redhat.com: Success

Restaring pcsd on the nodes in order to reload the certificates…
node5.redhat.com: Success *显示添加成功*
node6.redhat.com: Success *显示添加成功*

5.两个节点同时启动corosync和pacemaker进程

[[email protected] ~]# systemctl start corosync.service
[[email protected] ~]# systemctl start pacemaker.service

[[email protected] ~]# systemctl start corosync.service
[[email protected] ~]# systemctl start pacemaker.service

6.在两个节点上安装httpd进程并设置为开机启动

[email protected] ~]# yum install httpd -y
systemctl enable httpd.service

[email protected] ~]# yum install httpd -y
systemctl enable httpd.service

7.在两个节点上安装nft-utils以实现支持挂载nfs共享

[[email protected] ~]# yum install nfs-utils

[[email protected] ~]# yum install nfs-utils

8.安装crmsh,CentOS7默认不带crmsh，需要去网上下载rpm包，我用的是crmsh-2.2.0-7.1.noarch.rpm和crmsh-scripts-2.2.0-7.1.noarch.rpm、python-parallax-1.0.1-10.1.noarch.rpm

[[email protected] ~]# yum install crmsh-2.2.0-7.1.noarch.rpm crmsh-scripts-2.2.0-7.1.noarch.rpm python-parallax-1.0.1-10.1.noarch.rpm -y

[[email protected] ~]# yum install crmsh-2.2.0-7.1.noarch.rpm crmsh-scripts-2.2.0-7.1.noarch.rpm python-parallax-1.0.1-10.1.noarch.rpm -y

9.利用crmsh配置资源

[[email protected] ~]# crm configure

配置VIP资源
crm(live)configure# primitive webip ocf:heartbeat:IPaddr ip=’172.16.100.100’ op monitor interval=20s timeout=40s

配置NFS资源
crm(live)configure# primitive webstore ocf:heartbeat:Filesystem params device=’172.16.0.254:/www/htdocs’ directory=’/var/www/html’ fstype=’nfs’ op start timeout=60s op stop timeout=60s op monitor interval=20s timeout=40s

配置WEB资源
crm(live)configure# primitive webserver systemd:httpd op start timeout=60s op stop timeout=60s op monitor interval=20s timeout=60s

因为是两节点集群，需要关闭stonith
crm(live)configure# property stonith-enabled=false

crm(live)configure# commit

10.设置这三个服务要同时在一个节点上运行，并且启动顺序一定为VIP -> NFS -> httpd

　　设置三个服务在同一节点上运行有两种方法实现，一种是将所有资源设置到同一个组里面，或者设置排列约束。当然，即设置了组，又定义为了排列约束也是可以的。设置启动顺序那么必须使用顺序约束。

设置组

crm(live)configure# group webservice webip webstore webserver

或排列约束

crm(live)configure# colocation webip_with_webstore inf: webip webstore
crm(live)configure# colocation webstore_with_webserver inf: webstore webserver

顺序约束

crm(live)configure# order webip_before_webstore Mandatory: webip webstore
crm(live)configure# order webstore_before_webserver Mandatory: webstore webserver
crm(live)configure# commit