heatbeat-gui实现基于nfs的mysql高可用集群
一、简述HA高可用集群高可用集群就是当集群中的一个节点发生各种软硬件及人为故障时，集群中的其他节点能够自动接管故障节点的资源并向外提供服务。以实现减少业务中断时间，为用户提供更可靠，更高效的服务。
二、基于nfs实现mysql的高可用集群配置
环境准备接上文 heartbeat-gui部署
实验环境：
nfs server准备
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1、在nfs server准备LVM存储空间
# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x61284c6a.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (1-1305, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305): +10G
Value out of range.
Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305): +5G
Command (m for help): t
Selected partition 3
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 8e (Linux LVM)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
# partx -a /dev/sdb
# pvcreate /dev/sdb3
Physical volume "/dev/sdb3" successfully created
# vgcreate myvg /dev/sdb3
Volume group "myvg" successfully created
# lvcreate -L 5G -n mydata myvg
Logical volume "mydata" created.
# mke2fs -t ext4 /dev/myvg/mydata
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
327680 inodes, 1310720 blocks
65536 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1342177280
40 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 36 mounts or
180 days, whichever comes first.Use tune2fs -c or -i to override.
2、开机自动挂载，并nfs导出
# mkdir/mydata
# vim /etc/fstab
/dev/myvg/mydata /mydata ext4 defaults 0 0
# mount -a
# mount | grep /mydata
/dev/mapper/myvg-mydata on /mydata type ext4 (rw)
# vim /etc/exports
/mydata 192.168.0.0/24(rw,no_root_squash)
#共享给192.168.0.0/24网段，可读可写，允许root用户登录便于初始化，配置结束可取消root用户登录
3、导出nfs共享目录
#创建mysql用户，指明uid，gid。各节点的mysql用户uid，gid一致。
# groupadd -r -g 306 mysql
# useradd -r -g 306 -u 306 mysql
#创建共享目录，并修改属主属组。
# mkdir /mydata/data
# chown -R mysql.mysql /mydata/data
#导出nfs共享目录
# exportfs -arv
exporting 192.168.0.0/24:/mydata
各节点准备mysql，并测试nfs。以下步骤，各节点一致。
node1配置
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# mkdir /mydata
# showmount -e 192.168.0.20
Export list for 192.168.0.20:
/mydata 192.168.0.0/24
# mount -t nfs 192.168.0.20:/mydata /mydata
# mount | grep /mydata
192.168.0.20:/mydata on /mydata type nfs (rw,vers=4,addr=192.168.0.20,clientaddr=192.168.0.15)
# groupadd -r -g 306 mysql
# useradd -r -g 306 -u 306 mysql
#验证mysql用户是否拥有共享目录权限
# su - mysql
su: warning: cannot change directory to /home/mysql: No such file or directory
-bash-4.1$
-bash-4.1$
-bash-4.1$ cd /mydata/data
-bash-4.1$ touch node1.txt
-bash-4.1$ ls
node1.txt
-bash-4.1$ rm node1.txt
-bash-4.1$ exit
logout
#在nfs server端验证
# cd /mydata/data
# ll
total 0
-rw-rw-r--. 1 mysql mysql 0 Nov 19 19:59 node2.txt
#验证root用户对目录是否有权限
# touch /mydata/data/node.txt
# ll /mydata/data
total 0
-rw-r--r--. 1 root root 0 Nov 19 20:02 node.txt
#安装mariadb
# tar xf mariadb-5.5.46-linux-x86_64.tar.gz -C /usr/local
# cd /usr/local
# ln -sv mariadb-5.5.46-linux-x86_64 mysql
`mysql' -> `mariadb-5.5.46-linux-x86_64'
# cd mysql/
# chown -R root.mysql ./*
#初始化mysql至nfs，此步骤只需一个节点操作即可，本文node1执行，那么node2就不需要执行
#初始化操作后，可以将nfs server的共享选项中的no_root_squash移除了
# ./scripts/mysql_install_db --datadir=/mydata/data/ --user=mysql
#nfs server验证
# ls
aria_log.00000001aria_log_controlmysqlperformance_schematest
#为mysql节点准备配置文件
# mkdir /etc/mysql
# cp support-files/my-large.cnf /etc/mysql/my.cnf
#编辑配置文件，加入以下三行
# vim /etc/mysql/my.cnf
datadir = /mydata/data
innodb_file_per_table = on
skip_name_resolve = on
#为mysql节点准备服务脚本，并禁止mysqld开机自启
# cp support-files/mysql.server /etc/rc.d/init.d/mysqld
# chkconfig --add mysqld
# chkconfig mysqld off
#启动mysql，创建mydb数据库
# service mysqld start
# /usr/local/mysql/bin/mysql
Welcome to the MariaDB monitor.Commands end with ; or \g.
Your MariaDB connection id is 3
Server version: 5.5.46-MariaDB-log MariaDB Server
Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> CREATE DATABASE mydb;
Query OK, 1 row affected (0.03 sec)
MariaDB [(none)]> exit
Bye
# service mysqld stop
node2配置
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# tar xf mariadb-5.5.46-linux-x86_64.tar.gz-C /usr/local
# cd /usr/local/
# ln -sv mariadb-5.5.46-linux-x86_64 mysql
`mysql' -> `mariadb-5.5.46-linux-x86_64'
# cd mysql/
# chown root.mysql ./*
#将node1的mysql配置文件复制给node2
# scp /etc/mysql/my.cnf node2:/etc/mysql/
#准备服务脚本，并禁止开机自启
# cp support-files/mysql.server /etc/rc.d/init.d/mysqld
# chkconfig --add mysqld
# chkconfig mysqld off
#启动服务并查看共享数据库
# service mysqld start
# /usr/local/mysql/bin/mysql
Welcome to the MariaDB monitor.Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.46-MariaDB-log MariaDB Server
Copyright (c) 2000, 2015, 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 |
| mydb |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.02 sec)
MariaDB [(none)]> EXIT
Bye
#授权root用户远程访问mysql
# /usr/local/mysql/bin/mysql
Welcome to the MariaDB monitor.Commands end with ; or \g.
Your MariaDB connection id is 3
Server version: 5.5.46-MariaDB-log MariaDB Server
Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> grant all on *.* to 'root'@'192.168.%.%' identified by '123456';
Query OK, 0 rows affected (0.06 sec)
MariaDB [(none)]> flush privileges;
Query OK, 0 rows affected (0.01 sec)
# service mysqld stop
在node1和node2卸载共享目录
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# umount /mydata
三、在heartbeat-gui界面配置
1、添加组资源，以及ip资源
2、添加共享文件系统资源
3、添加mysql-server资源
注意：定义的次序就是启动的次序。
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