drbd + mysql 高可用集群
在上两篇中，我分别写到了 drbd 和 corosync、pacemaker、crm 的配置和使用，在本节中，我讲这两种东西结合起来，做出 drbd + mysql 高可用集群。一、实验环境
系统版本：centos7
实验机器：
node1：192.168.163.172
node2：192.168.163.173
软件源：阿里云
二、实验过程
drbd 的配置和 corosync 的配置就不再说明，直接开始
首先增加drbd资源
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crm(live)#configure
crm(live)configure#primitive mysqldrbd ocf:linbit:drbd params drbd_resource=mysql op start timeout=240 op stop timeout=100 op monitor role=Master interval=20 timeout=30 op monitor role=Slave interval=30 timeout=30
crm(live)configure#ms ms_mysqldrbd mysqldrbd meta master-max=1 master-node-max=1 clone-max=2clone-node-max=1 notify=true
crm(live)configure#verify
crm(live)configure#show
crm(live)configure# show
node 1: node1
node 2: node2
primitive mysqldrbd ocf:linbit:drbd \
params drbd_resource=mysql \
op start timeout=240 interval=0 \
op stop timeout=100 interval=0 \
op monitor role=Master interval=20 timeout=30 \
op monitor role=Slave interval=30 timeout=30
ms ms_mysqldrbd mysqldrbd \
meta master-max=1 master-node-max=1 clone-max=2 clone-node-max=1 notify=true
property cib-bootstrap-options: \
have-watchdog=false \
dc-version=1.1.16-12.el7_4.4-94ff4df \
cluster-infrastructure=corosync \
cluster-name=mycluster \
stonith-enabled=false
增加文件系统资源
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crm(live)configure#primitive mystore ocf:heartbeat:Filesystem params device=/dev/drbd1 directory=/data fstype=xfs op start timeout=60 op stop timeout=60
给文件系统类型和drbd做亲缘性绑定
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crm(live)configure# colocation mystore_with_ms_mysqldrbd inf: mystore ms_mysqldrbd:Master
做顺序约束，当drbd起来之后才对文件系统进行绑定
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crm(live)configure# order mystore_after_ms_mysqldrbd mandatory: ms_mysqldrbd:promote mystore:start
接下来增加一下mysql资源,并作亲缘性绑定
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crm(live)configure#primitive mysqld systemd:mariadb
crm(live)configure# colocation mysqld_with_mystoreinf: mysqld mystore
作顺序约束，先挂载文件系统，然后在启动msyqld资源
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crm(live)configure#order mysqld_after_mystore mandatory: mystore mysqld
增加VIP资源，作虚拟IP调度
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crm(live)#configure
crm(live)configure#primitive myvip ocf:heartbeat:IPaddr params ip="192.168.113.120" opmonitor interval=20 timeout=20 on-fail=restart
crm(live)configure#colocation vip_with_ms_mysqldrbd inf:ms_mysqldrbd:Master myvip
检查并提交
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crm(live)configure#verify
crm(live)configure#commit
查看状态
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crm(live)# status
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum
Last updated: Wed Oct 25 08:38:22 2017
Last change: Wed Oct 25 08:38:14 2017 by root via crm_attribute on node2
2 nodes configured
5 resources configured
Online: [ node1 node2 ]
Full list of resources:
Master/Slave Set: ms_mysqldrbd
Masters: [ node1 ]
Slaves: [ node2 ]
mystore(ocf::heartbeat:Filesystem):Started node1
mysqld(systemd:mariadb):Started node1
myvip(ocf::heartbeat:IPaddr):Started node1
三、测试
先访问数据库，并新建一个用户，供远程访问使用
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MariaDB[(none)]> GRANT ALL ON *.* TO 'root'@'%' IDENTIFIED BY '123456';
QueryOK, 0 rows affected (0.00 sec)
使用VIP访问数据库
# mysql -uroot -p123456 -h 192.168.163.100
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Welcome to the MariaDB monitor.Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases;
+---------------------+
| Database |
+---------------------+
| information_schema|
| #mysql50#lost+found |
| mysql |
| mysqld |
| performance_schema|
| xhk |
| xhk777 |
+---------------------+
7 rows in set (0.06 sec)
接下来，将node停掉，服务自行转到node2
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crm(live)# node standby
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crm(live)# status
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum
Last updated: Wed Oct 25 08:43:46 2017
Last change: Wed Oct 25 08:43:41 2017 by root via crm_attribute on node1
2 nodes configured
5 resources configured
Node node1: standby
Online: [ node2 ]
Full list of resources:
Master/Slave Set: ms_mysqldrbd
Slaves: [ node2 ]
Stopped: [ node1 ]
mystore (ocf::heartbeat:Filesystem): Stopped
mysqld (systemd:mariadb):Stopped
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crm(live)# status
Stack: corosync
Current DC: node1 (version 1.1.16-12.el7_4.4-94ff4df) - partition with quorum
Last updated: Wed Oct 25 08:43:46 2017
Last change: Wed Oct 25 08:43:41 2017 by root via crm_attribute on node1
2 nodes configured
5 resources configured
Node node1: standby
Online: [ node2 ]
Full list of resources:
Master/Slave Set: ms_mysqldrbd
Slaves: [ node2 ]
Stopped: [ node1 ]
mystore(ocf::heartbeat:Filesystem):Stopped
mysqld(systemd:mariadb):Stopped
myvip(ocf::heartbeat:IPaddr):Started node2
继续使用VIP访问数据库
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# mysql -uroot -p123456 -h 192.168.163.100
Welcome to the MariaDB monitor.Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> show databases;
+---------------------+
| Database |
+---------------------+
| information_schema|
| #mysql50#lost+found |
| mysql |
| mysqld |
| performance_schema|
| xhk |
| xhk777 |
+---------------------+
7 rows in set (0.06 sec)
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