RHCA436-基于CentOS8pacemaker+corosync 集群资源管理

一、管理资源命令

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1.列出资源
pcs resource list
pcs resource config [myweb]
 
2.查看资源帮助
pcs resource describe Filesystem
 
3.查看已经创建的资源
pcs status resources 
pcs resource 
pcs resource show myweb
 
4.创建资源，指定资源组
pcs resource create myfs Filesystem device=storage.san01.example.com:/myweb directory=/var/www/html  fstype=nfs --group=mygroup
 
5.查看资源配置参数
pcs resource config
pcs resource show myfs
 
6.删除资源参数
pcs resource op remove myfs minotor
 
7.添加资源参数
pcs resource op add myfs monitor interval=10s timeout=20s
 
8.修改资源控制参数
pcs resource update myfs op monitor interval=10s timeout=20s  on-fail=fence
 
测试：
[root@nodec ~]# umount /var/www/html
on-fail=fence  卸载挂载点会被fence掉，fence的默认策略是reboot
 
9.添加资源到资源组
pcs resource group add mygroup myweb
pcs resource group add mygroup myip
 
10.从资源组中移除资源
pcs resource group remove mygroup  myip
 
11.启动资源组中的资源
[root@nodea ~]# pcs resource enable myweb
[root@nodea ~]# pcs resource status
  * Resource Group: mygroup:
    * myfs  (ocf::heartbeat:Filesystem):   Started nodeb.private.example.com
    * myip  (ocf::heartbeat:IPaddr2):   Started nodeb.private.example.com
    * myweb  (systemd:httpd):   Starting nodeb.private.example.com
 
12.关闭资源组中的资源
[root@nodea ~]# pcs resource disable myweb
[root@nodea ~]# pcs resource status
  * Resource Group: mygroup:
    * myfs  (ocf::heartbeat:Filesystem):   Started nodeb.private.example.com
    * myip  (ocf::heartbeat:IPaddr2):   Started nodeb.private.example.com
    * myweb  (systemd:httpd):   Stopped (disabled)
 
pcs resource disable mygroup  停止资源组
pcs resource enable mygroup   启动资源组
 
13.清空资源报错信息
pcs resource cleanup

二、实验：创建文件系统资源，并加入资源组

1.在存储节点配置NFS共享存储

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[root@storage ~]# mkdir /myweb
[root@storage ~]# chmod 777 /myweb
[root@storage ~]# cat /etc/exports
/myweb  *(rw)
[root@storage ~]# systemctl enable nfs-server
[root@storage ~]# systemctl restart nfs-server
[root@storage ~]# firewall-cmd  --permanent --add-service=nfs
[root@storage ~]# firewall-cmd  --permanent --add-service=rpc-bind 
[root@storage ~]# firewall-cmd  --permanent --add-service=mountd 
[root@storage ~]# firewall-cmd  --reload

2.创建文件系统资源

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[root@nodea ~]# pcs resource create myfs Filesystem device=storage.san01.example.com:/myweb directory=/var/www/html  fstype=nfs --group=mygroup
 
[root@nodea ~]# pcs status resources
  * Resource Group: mygroup:
    * myfs  (ocf::heartbeat:Filesystem):   Started nodea.private.example.com

3.将资源移动到其他节点

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pcs resource move myfs    将资源自动到其他任意节点，当前节点会变成负无穷
pcs resource move myfs nodec.private.example.com  将资源移动到nodec节点，nodec节点会变成正无穷
pcs resource ban myweb nodea.private.example.com  将某个节点设置为负无穷
 
查看限制规则：
[root@nodeb ~]# pcs constraint list
Location Constraints:
  Resource: myfs
    Enabled on:
      Node: nodec.private.example.com (score:INFINITY) (role:Started)
    Disabled on:
      Node: nodea.private.example.com (score:-INFINITY) (role:Started)
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:
 
清除规则：
pcs resource clear myfs
 
说明：如果nodec故障，则会自动移动到nodeb节点，处于负无穷状态的节点是不会运行该资源的，即使没有其他节点可以使用，如果只有处于负无穷状态的主机存活，那么该资源会停止运行。

三、资源操作参数，修改参数可以对资源进行调优

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#创建资源
[root@nodea ~]# pcs resource create myfs Filesystem device=storage.san01.example.com:/myweb directory=/var/www/html  fstype=nfs --group=mygroup
 
#修改资源控制参数
[root@nodea ~]# pcs resource update myfs op monitor interval=10s timeout=20s  on-fail=fence
 
#查看资源参数
[root@nodea ~]# pcs resource show myfs
[root@nodea ~]# pcs resource config
 Group: mygroup
  Resource: myfs (class=ocf provider=heartbeat type=Filesystem)
   Attributes: device=storage.san01.example.com:/myweb directory=/var/www/html fstype=nfs
   Operations: monitor interval=10s on-fail=fence timeout=20s (myfs-monitor-interval-10s)
               start interval=0s timeout=60s (myfs-start-interval-0s)
               stop interval=0s timeout=60s (myfs-stop-interval-0s)
 
 
#参数说明
1.name=value，value等于start,stop或者monitor
  start：启动时的配置
  stop：停止时的配置
 
2.interval=value，资源检测的间隔时间，默认是60s
 
3.timeout=value，检测到资源故障时的等待时间，超时后如果没有恢复再处理
 
4.on-fail=action,action等于ignore，block，stop，restart，fence，standby
  ignore：忽略故障，资源不做任何处理，仍然显示正常启动，手动恢复故障后，资源依然可用
      * myweb  (systemd:httpd):   Started nodea.private.example.com 
 
  block：如果集群没有配置fence，那么资源会停止
      * myweb  (systemd:httpd):   FAILED nodea.private.example.com (blocked)
 
  stop：停止该节点的资源，资源组不会切换，手动恢复服务后，资源仍然不会运行
      * myweb  (systemd:httpd):   Stopped 
      pcs resource refresh 会重新启动该资源
 
  restart：重启该节点的服务，尝试在该节点恢复，这是默认策略，如果不能恢复，则资源组会切换
      systemctl mask httpd; systemctl stop httpd
      说明：演示服务无法恢复的场景，资源组会切换
 
  fence：如果节点故障，并且配置了fence，则会按照fence的策略执行重启节点，则资源组会切换到其他节点
 
  standby：让节点进入standby模式。这个模式下的节点可以继续运行corosync和pacemaker但是无法运行资源。任何原本在此节点激活的资源都会被转移。这个特性在执行系统管理任务比如更新资源所需的packages时会非常有用。

四、实验一、添加ip，文件系统和http服务，并加入资源组

1.共享存储已经配置好

2.在所有节点安装http软件包

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yum -y install httpd
说明：不需要启动服务，也不需要设置开机自启

3.在所有节点放行http服务

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firewall-cmd  --permanent --add-service=http
firewall-cmd  --reload

4.在所有节点设置selinux

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setsebool -P httpd_use_nfs=1

5.创建文件系统，ip和http资源

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1.创建文件系统
pcs resource create myfs Filesystem device=storage.san01.example.com:/myweb directory=/var/www/html  fstype=nfs --group=mygroup
 
2.创建ip
pcs resource create myip IPaddr2 ip=172.25.250.99 cidr_netmask=24 --group mygroup
 
3.创建http服务
pcs resource create myweb systemd:httpd --group=mygroup 
 
4.查看集群状态
[root@nodea ~]# pcs resource status
  * Resource Group: mygroup:
    * myfs  (ocf::heartbeat:Filesystem):   Started nodec.private.example.com
    * myip  (ocf::heartbeat:IPaddr2):   Started nodec.private.example.com
    * myweb  (systemd:httpd):   Started nodec.private.example.com
 
5.测试
curl 172.25.250.99
 
[root@nodec ~]# systemctl status httpd  #服务已经启动
[root@nodec ~]# ip a  #查看vip已经创建

五、控制资源迁移

1.查看限制规则：

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[root@nodeb ~]# pcs constraint list
Location Constraints:
  Resource: myfs
    Enabled on:
      Node: nodec.private.example.com (score:INFINITY) (role:Started)
    Disabled on:
      Node: nodea.private.example.com (score:-INFINITY) (role:Started)
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:
 
INFINITY：正无穷，更倾向于运行在该节点
-INFINITY：负无穷，不会运行在该节点，即使没有节点可以运行

2.手动移动集群资源

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pcs resource move myfs    将资源自动到其他任意节点，当前节点会变成负无穷
pcs resource move myfs nodec.private.example.com  将资源移动到nodec节点，nodec节点会变成正无穷
 
#此种规则是临时的，因为可以用以下命令清除
pcs resource clear myfs
 
 
pcs constraint location myweb prefers nodea.private.example.com 将某个节点设置为正无穷
pcs constraint location myweb avoids nodec.private.example.com 将某个节点设置为负无穷
 
#删除以上规则规则
pcs constraint location delete location-myftp-nodec.private.example.com-INFINITY

3.管理节点的优先级

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1.设置优先级，数值越大优先级越高
pcs constraint location myweb prefers nodea.private.example.com=200
pcs constraint location myweb prefers nodeb.private.example.com=500
 
[root@nodea ~]# pcs resource status
  * Resource Group: mygroup:
    * myfs  (ocf::heartbeat:Filesystem):   Started nodeb.private.example.com
    * myip  (ocf::heartbeat:IPaddr2):   Started nodeb.private.example.com
    * myweb  (systemd:httpd):   Started nodeb.private.example.com
 
 
2.查看规则，--full可以查看规则的id
[root@nodea ~]# pcs constraint list --full
Location Constraints:
  Resource: myftp
    Enabled on:
      Node: nodec.private.example.com (score:INFINITY) (id:location-myftp-nodec.private.example.com-INFINITY)
  Resource: myweb
    Enabled on:
      Node: nodea.private.example.com (score:200) (id:location-myweb-nodea.private.example.com-200)
      Node: nodeb.private.example.com (score:500) (id:location-myweb-nodeb.private.example.com-500)
    Disabled on:
      Node: nodec.private.example.com (score:-INFINITY) (id:location-myweb-nodec.private.example.com--INFINITY)
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:
 
3.删除优先级
pcs constraint delete 规则id
pcs constraint delete location-myweb-nodea.private.example.com-200
pcs constraint delete location-myweb-nodeb.private.example.com-500

六、实验：添加另一组资源ip，文件系统和ftp服务，并加入资源组

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1.存储端
mkdir /ftp
chmod 777
cat /etc/exports
/ftp *(rw)
systemctl restart nfs-server
 
2.集群
#每个节点都执行
yum -y install vsftpd
firewall-cmd  --permanent --add-service=ftp
firewall-cmd  --reload
setsebool -P ftpd_use_nfs=1
 
#对集群的操作，在任意一个节点执行
pcs resource create myftpfs Filesystem device=storage.san01.example.com:/ftp directory=/var/ftp/pub fstype=nfs --group=myftp
 
pcs resource create myftpip IPaddr2 ip=172.25.250.100 cidr_netmask=24 --group myftp
 
pcs resource create myftpservice systemd:vsftpd --group=myftp
 
3.查看集群状态
[root@nodea pub]# pcs resource status
  * Resource Group: mygroup:
    * myfs  (ocf::heartbeat:Filesystem):   Started nodea.private.example.com
    * myip  (ocf::heartbeat:IPaddr2):   Started nodea.private.example.com
    * myweb  (systemd:httpd):   Started nodea.private.example.com
  * Resource Group: myftp:
    * myftpfs  (ocf::heartbeat:Filesystem):   Started nodeb.private.example.com
    * myftpip  (ocf::heartbeat:IPaddr2):   Started nodeb.private.example.com
    * myftpservice  (systemd:vsftpd):   Started nodeb.private.example.com
 
 
4.一个集群运行两个资源组
 
资源组nygroup优先运行在nodea上
资源组myftp 优先运行在nodec上
 
[root@nodea pub]# pcs constraint location myftp prefers nodec.private.example.com
[root@nodea pub]# pcs constraint list
Location Constraints:
  Resource: myftp
    Enabled on:
      Node: nodec.private.example.com (score:INFINITY)
  Resource: myweb
    Enabled on:
      Node: nodea.private.example.com (score:INFINITY)
    Disabled on:
      Node: nodec.private.example.com (score:-INFINITY)
Ordering Constraints:
Colocation Constraints:
Ticket Constraints:
[root@nodea pub]# pcs resource status
  * Resource Group: mygroup:
    * myfs  (ocf::heartbeat:Filesystem):   Started nodea.private.example.com
    * myip  (ocf::heartbeat:IPaddr2):   Started nodea.private.example.com
    * myweb  (systemd:httpd):   Started nodea.private.example.com
  * Resource Group: myftp:
    * myftpfs  (ocf::heartbeat:Filesystem):   Started nodec.private.example.com
    * myftpip  (ocf::heartbeat:IPaddr2):   Started nodec.private.example.com
    * myftpservice  (systemd:vsftpd):   Started nodec.private.example.com