基于 NFS 存储建立 WEB 群（PCS 工具）

防火墙开启的情况要增加 nfs，rpc-bind,mounted 服务，然后 reload 生效

2、准备 NFS 服务器资源

创建 Export 目录（共享目录）

[root@sto yum.repos.d]# mkdir /http

[root@sto yum.repos.d]# chmod a+x /http

[root@sto yum.repos.d]# vi /etc/exports

/http * (rw)

[root@sto yum.repos.d]# systemctl restart nfs-server

在其他节点进行测试

[root@rs1 ~]# showmount -e sto

Export list for sto:

/http *

[root@rs1 ~]# mkdir /mnt/nfs

[root@rs1 ~]# mount sto:/http /mnt/nfs

[root@rs1 ~]# cp ./anaconda-ks.cfg /mnt/nfs/test.txt

[root@rs2 ~]# showmount -e sto

Export list for sto:

/http *

[root@rs2 ~]# mkdir /mnt/nfs

[root@rs2 ~]# mount sto:/http /mnt/nfs

[root@rs2 ~]# cp ./anaconda-ks.cfg /mnt/nfs/test2.txt

[root@sto http]# ls

test2.txt test.txt

创建 NFS 集群

[root@rs1 ~]# pcs resource create WebFS ocf:heartbeat:Filesystem \

device='sto:/http' directory='/var/www/html' fstype='nfs' \

op monitor interval=20s timeout=40s \

op start timeout=60s op stop timeout=60s

[root@rs1 ~]# pcs resource create WebFS ocf:heartbeat:Filesystem device='storage:/http' directory='/var/www/html' fstype='nfs' op monitor interval=20s timeout=40s > op start timeout=60s op stop timeout=60s

[root@rs1 ~]# pcs status

Cluster name: cluster1

Stack: corosync

Current DC: rs1 (version 1.1.20-5.el7-3c4c782f70) - partition with quorum

Last updated: Sat May 9 02:59:31 2020

Last change: Sat May 9 02:59:22 2020 by root via cibadmin on rs1

2 nodes configured

3 resources configured

Online: [ rs1 rs2 ]

Full list of resources:

VirtualIP (ocf::heartbeat:IPaddr2): Started rs1

WebFS (ocf::heartbeat:Filesystem): Started rs2

Daemon Status:

corosync: active/disabled

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aker: active/disabled

pcsd: active/enabled

[root@rs1 ~]# echo NFS > /var/www/html

[root@rs1 ~]# systemctl restart httpd

创建 web 集群

pcs resource create Wbsite ocf??apache

httpd="/usr/sbin/httpd" \

configfile=/etc/httpd/conf/httpd.conf \

statusurl=“http://localhost/server-status” \

op monitor interval=1min

之前碰到的问题是 web 群集起不来，后来在一篇文章发现要添加 httpd="/usr/sbin/httpd" ，也就是 httpd 命令的位置，这样就可以了

[root@rs1 html]# pcs status

Cluster name: cluster1

Stack: corosync

Current DC: rs1 (version 1.1.20-5.el7-3c4c782f70) - partition with quorum

Last updated: Sat May 9 03:41:11 2020

Last change: Sat May 9 03:21:45 2020 by root via cibadmin on rs1

2 nodes configured

3 resources configured

Online: [ rs1 rs2 ]

Full list of resources:

VirtualIP (ocf::heartbeat:IPaddr2): Started rs1

WebFS (ocf::heartbeat:Filesystem): Started rs1

Wbsite (ocf::heartbeat:apache): Started rs1

Daemon Status:

corosync: active/disabled

pacemaker: active/disabled

pcsd: active/enabled

配置组和约束

通过将资源运行在同一节点上

[root@rs1 ~]# pcs resource group add a VirtualIP WebFS Website

[root@rs1 html]# pcs status Cluster name: cluster1 Stack: corosync

Current DC: rs1 (version 1.1.20-5.el7-3c4c782f70) - partition with

quorum Last updated: Sat May 9 03:42:47 2020 Last change: Sat May 9

03:42:44 2020 by root via cibadmin on rs1

2 nodes configured 3 resources configured

Online: [ rs1 rs2 ]

Full list of resources:

Resource Group: a

VirtualIP (ocf:??IPaddr2): Started rs1

WebFS (ocf:??Filesystem): Started rs1

Wbsite (ocf:??apache): Started rs1

Daemon Status: corosync: active/disabled pacemaker:

active/disabled pcsd: active/enabled

通过约束管理资源的启动

[root@rs1 ~]# pcs constraint order VirtualIP then Website

Adding VirtualIP Wbsite (kind: Mandatory) (Options: first-action=start then-action=start)

[root@rs1 ~]# pcs constraint order WebFS then Website

Adding WebFS Wbsite (kind: Mandatory) (Options: first-action=start then-action=start)

资源在 web1 的情况下访问 VIP

资源在 web2 的情况下访问：

[root@rs1 ~]# pcs status

Cluster name: cluster1

Stack: corosync

Current DC: rs1 (version 1.1.20-5.el7-3c4c782f70) - partition with quorum

Last updated: Sat May 9 03:55:54 2020

Last change: Sat May 9 03:55:40 2020 by root via cibadmin on rs1

2 nodes configured

3 resources configured

Node rs1: standby

Online: [ rs2 ]

Full list of resources:

Resource Group: a

VirtualIP (ocf::heartbeat:IPaddr2): Started rs2

WebFS (ocf::heartbeat:Filesystem): Started rs2

Wbsite (ocf::heartbeat:apache): Starting rs2