Centos7.7下建立无共享存储的WEB集群（pcs+pacemaker+corosync）
规划设计
操作系统安装
群集组件安装
群集节点准备
2创建VIP资源
3创建Web/Apache资源
4配置约束
5群集测试
1.准备工作（重要）
群集组件和节点的准备我在另一张博客中已经介绍，可以参考
https://blog.csdn.net/qq_45714272/article/details/106017375
[root@rs1 corosync]# crm_verify -L -V ## 检查配置有无错误
禁用stonish
[root@rs1 corosync]# pcs property set stonith-enabled=false
2.创建vip资源
[root@rs1 corosync]# pcs resource create VirtualIP
ocfIPaddr2 ip=192.168.43.100 cidr_netmask=24 op monitor
interval=30s
创建VIP资源如果不生效，只要禁用掉stonish设备即可
pcs property set stonith-enabled=false
[root@rs1 ~]# pcs resource create VirtualIP ocf:heartbeat:IPaddr2 ip=192.168.43.100 cidr_netmask=24 op monitor interval=30s[root@rs1 ~]# pcs status
[root@rs1 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:46:eb:23 brd ff:ff:ff:ff:ff:ff
inet 192.168.43.10/24 brd 192.168.43.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::a0b8:9a41:6d1b:7285/64 scope link noprefixroute
valid_lft forever preferred_lft forever
可以看出，添加的虚拟IP没有在rs1身上,我们禁用stonish设备
[root@rs1 ~]# pcs property set stonith-enabled=false
[root@rs1 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:46:eb:23 brd ff:ff:ff:ff:ff:ff
inet 192.168.43.10/24 brd 192.168.43.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet 192.168.43.100/24 brd 192.168.43.255 scope global secondary ens32
valid_lft forever preferred_lft forever
inet6 fe80::a0b8:9a41:6d1b:7285/64 scope link noprefixroute
valid_lft forever preferred_lft forever
成功啦！
详细介绍可以看我另一篇博客
https://blog.csdn.net/qq_45714272/article/details/106007691
开始用pcs创建资源：
创建Web/Apache资源（节点都要做）
开两台虚拟机，安装以下服务，并配置。如下：
firewall-cmd --permanent --add-service=http && firewall-cmd --reload
yum install -y httpd
echo "$(hostname)" >> /var/www/html/index.html
systemctl restart httpd
systemctl enable httpd
创建Apache状态URL(节点都要做)
vim /etc/httpd/conf.d/status.conf
<location /server-status>
setHandler server-status
Order deny,allow
deny from all
Allow from 127.0.0.1
</location>
创建Apache资源
pcs resource create Website ocfapache
configfile=/etc/httpd/conf/httpd.conf
statusurl=“http://localhost/server-status” \ op monitor interval=1min
删除Apache资源
pcs resource delete Website
查看状态
[root@rs1 ~]# pcs status
Cluster name: cluster1
Stack: corosync
Current DC: rs1 (version 1.1.20-5.el7-3c4c782f70) - partition with quorum
Last updated: Fri May 8 10:27:09 2020
Last change: Fri May 8 10:26:53 2020 by root via cibadmin on rs1
2 nodes configured
2 resources configured
Online: [ rs1 rs2 ]
Full list of resources:
VIP (ocf::heartbeat:IPaddr2): Started rs2
Website (ocf::heartbeat:apache): Starting rs1
Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/enabled
无共享存储的web群集就搭建好了，我们可以通过VIP来访问web群集，一台服务器宕机，我们可以利用pcs工具对VIP进行迁移，访问另一台服务器，实现了HA
对集群进行约束
确保资源在同一节点
1.添加约束确保资源在同一节点
[root@rs1 ~]# pcs constraint
Location Constraints:
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:
[root@rs1 ~]# pcs constraint colocation add Website with VirtualIP INFINITY
[root@rs1 ~]# pcs status
Cluster name: cluster1
Stack: corosync
Current DC: rs1 (version 1.1.20-5.el7-3c4c782f70) - partition with quorum
Last updated: Fri May 8 10:51:57 2020
Last change: Fri May 8 10:51:52 2020 by root via cibadmin on rs1
2 nodes configured
2 resources configured
Online: [ rs1 rs2 ]
Full list of resources:
VirtualIP (ocf::heartbeat:IPaddr2): Started rs1
Website (ocf::heartbeat:apache): Starting rs1
Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/enabled
2.IP飘逸
[root@rs1 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:46:eb:23 brd ff:ff:ff:ff:ff:ff
inet 192.168.43.10/24 brd 192.168.43.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::a0b8:9a41:6d1b:7285/64 scope link noprefixroute
valid_lft forever preferred_lft forever
[root@rs1 conf.d]# pcs cluster standby rs1
[root@rs2 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:01:55:ac brd ff:ff:ff:ff:ff:ff
inet 192.168.43.20/24 brd 192.168.43.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet 192.168.43.100/24 brd 192.168.43.255 scope global secondary ens32
valid_lft forever preferred_lft forever
inet6 fe80::a0b8:9a41:6d1b:7285/64 scope link tentative noprefixroute dadfailed
valid_lft forever preferred_lft forever
inet6 fe80::1777:3e7e:f136:6cf/64 scope link noprefixroute
valid_lft forever preferred_lft forever
[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 02:08:53 2020
Last change: Sat May 9 02:08:47 2020 by root via cibadmin on rs1
2 nodes configured
1 resource configured
Node rs1: standby
Online: [ rs2 ]
Full list of resources:
VirtualIP (ocf::heartbeat:IPaddr2): Started rs2
Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/enabled
恢复：
[root@rs1 ~]# pcs cluster unstandby rs1
[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 02:11:31 2020
Last change: Sat May 9 02:11:23 2020 by root via cibadmin on rs1
2 nodes configured
1 resource configured
Online: [ rs1 rs2 ]
Full list of resources:
VirtualIP (ocf::heartbeat:IPaddr2): Started rs2
Daemon Status:
corosync: active/disabled
pacemaker: active/disabled
pcsd: active/enabled
3.先后顺序
[root@rs1 conf.d]# pcs constraint order VirtualIP then Website
Adding VirtualIP Website (kind: Mandatory) (Options: first-action=start then-action=start)
[root@rs1 conf.d]# pcs constraint
Location Constraints:
Ordering Constraints:
start VirtualIP then start Website (kind:Mandatory)
Colocation Constraints:
Ticket Constraints:
4.优先级
[root@rs1 conf.d]# pcs constraint location Website prefers rs1=50
[root@rs1 conf.d]# pcs constraint location Website prefers rs2=100
5.指定
配置排列约束，让vip与web 资源运行在一起，分数为100
[root@node1 ~]# pcs constraint colocation add vip with web 150
[root@rs1 conf.d]# pcs constraint colocation add VirtualIP with Website 100