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mysql+drbd+heartbeat高可用配置说明

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WBOY原創
2016-06-07 14:53:171353瀏覽

环境描述: 系统版本: Red Hat Enterprise Linux Server release 5.5 (Tikanga) x86_64 2.6.18-164.el5 mysql 版本: mysql-5.1.49.tar.gz drbd 版本: drbd83-8.3.15-2.el5.centos.rpm heartbeat 版本: heartbeat.x86_64 0:2.1.3-3.el5.centos.rpm 主机名

 

环境描述:

系统版本:Red Hat Enterprise Linux Server release 5.5 (Tikanga)x86_64 2.6.18-164.el5

mysql版本:mysql-5.1.49.tar.gz

drbd版本:drbd83-8.3.15-2.el5.centos.rpm

heartbeat版本:heartbeat.x86_64 0:2.1.3-3.el5.centos.rpm

主机名

Eth0

Eth1

备注

ln-master

10.10.206.193

192.168.1.10

ln-slave

10.10.206.194

192.168.1.11

VIP:10.10.206.211

 

前期工作(两台都要改)

修改主机名:

[root@ln-master ~]# cat /etc/sysconfig/network

NETWORKING=yes

NETWORKING_IPV6=no

HOSTNAME=ln-master

更改hosts文件(两台都要改)

[root@ln-master ~]# cat /etc/hosts

# Do not remove the following line, or various programs

# that require network functionality will fail.

127.0.0.1               localhost.localdomain localhost

::1             localhost6.localdomain6 localhost6

10.10.206.193     ln-master

192.168.1.10      ln-master

10.10.206.194     ln-slave

192.168.1.11      ln-slave

确保ping主机名能通,例如ping ln-slave

优化开机启动项,开基础的四项即可

[root@ln-master ~]#

[root@ln-master ~]# for A in `chkconfig --list |grep 3:on|awk '{print $1}'`;do chkconfig $A off;done

[root@ln-master ~]# for B in sshd crond syslog network;do chkconfig $B on;done

[root@ln-master ~]# chkconfig --list |grep 3:on

crond           0:off   1:off   2:on    3:on    4:on    5:on    6:off

network         0:off   1:off   2:on    3:on    4:on    5:on    6:off

sshd            0:off   1:off   2:on    3:on    4:on    5:on    6:off

syslog          0:off   1:off   2:on    3:on    4:on    5:on    6:off

重启

reboot

 

 

 

安装配置DRBD

注意:事先配置好YUM

  1. 1.   通过yum安装drbd(两台都要安装)

:drbd的版本和系统内核的对应  不同的版本对应不同的内核可以去官网看看

[root@ln-master ~]#yum install drbd83* -y  #安装drbd

[root@ln-master ~]#yum -y install kmod-drbd83*    #安装内核模块

[root@ln-master ~]#modprobe drbd     #加载drbd内核模块

[root@ln-master ~]# lsmod |grep drbd

drbd                  273204  0 #看到这个,证明加载drbd内核模块了。

  1. 2.   修改drbd配置文件(两台主机配置一样)

[root@ln-master ~]# cat /etc/drbd.conf

#

# please have a a look at the example configuration file in

# /usr/share/doc/drbd83/drbd.conf

#

global{
        usage-count no;         #
这个问你让不让官网统计
}
common {
        syncer {rate 100M;}     #
传输速度
}
resource r0 {
        protocol C;             #
传输协议(下面进行协议说明)
        startup {
        }
        disk {
                on-io-error detach;
        }
        net {      
                cram-hmac-alg "sha1"; #
两台服务器通信间的算法
                shared-secret "FooFunFactory"; #通信密码
#               after-sb-0pri disconnect;
#               after-sb-1pri disconnect;
#               after-sb-2pri disconnect;
                after-sb-0pri discard-younger-primary;
                after-sb-1pri discard-secondary;
                after-sb-2pri call-pri-lost-after-sb;
                rr-conflict disconnect;
        }
         syncer {
                rate 100M;
                al-extents 257;
        }
        on ln-master{                 #
这里一定要是hosts定义的名称
                device  /dev/drbd0;     #逻辑设备路径
                disk    /dev/sdb1;       #真实设备路径
                address  192.168.1.10:7789;   #maser传输数据的IP地址
                meta-disk  internal;
        }
        on ln-slave{
                device  /dev/drbd0;
                disk    /dev/sdb1;
                address  192.168.1.11:7789;  #slave
传输数据的IP地址
                meta-disk  internal;
        }
}

  1. 3.   DRBD一些说明

 DRBD 协议说明:

  A协议:数据一旦写入磁盘并发送到网络中就认为完成了写入操作

  B协议:收到接收确认就认为完成了写入操作

  C协议:收到写入确认就认为完成了写入操作                         

DRBD设备的三个进程:

每个drbd设备都有三个进程:

1  drbd0_workerdrbd0的主进程

2  drbd0_asenderprimary上的drbd0的数据发送进程

3  drbd0_receiversecondary上的drdb0的数据写入进程

DRBD几点注意的地方:

1  mount drbd设备以前必须把设备切换到primary状态

2  两个节点中,同一时间只能有一台处于primary状态,另一台是secondary状态

3  处于secondary状态的节点不可以挂载

4  主备最好使用大小一样的分区。

 

DRBD使用时建议使用Innodb存储引擎,同时打开binlog日志,设置innodb_flush_log_at_commit=1MyISAM存储引擎在DRBD上容易造成数据丢失,及文件损坏。

DRBD脑裂后处理:

drdb1-master

drbdadm secondary r0

drbdadm — –discard-my-data connect r0

drbdadm connect r0

drbd2-slave

drbdadm disconnect r0

drbdadm connect r0

 

  1. 4.   创建DRBD设备

我这里用的是虚拟机,我两台都添加了一块30G硬盘。

对新的磁盘分区格式化(两台都要操作):

[root@ln-master ~]# fdisk /dev/sdb

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel. 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)

 

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-652, default 1):

Using default value 1

Last cylinder or +size or +sizeM or +sizeK (1-652, default 652):

Using default value 652

 

Command (m for help): w

The partition table has been altered!

 

Calling ioctl() to re-read partition table.

 

Syncing disks.

创建drbd设备(两台都要执行)

[root@ln-slave ~]# drbdadm create-md r0 

Writing meta data...

initializing activity log

NOT initialized bitmap

New drbd meta data block successfully created.  #看到这些信息表示创建设备成功。

 

错误

Command 'drbdmeta 0 v08 /dev/sdb internal create-md' terminated with exit code 40
drbdadm create-md r0: exited with code 40

这是因为我们只把以前的分区删除了,并没有重新创建分区,创建分区即可

如果还出现这个错误提示运行

dd if=/dev/zero of=/dev/sdb1 bs=1M count=1

即可

  1. 启动drbd服务(两台都要启动)

[root@ln-master ~]# /etc/init.d/drbd start

Starting DRBD resources: [ d(r0) s(r0) n(r0) ]..........

[root@ln-master ~]# /etc/init.d/drbd status

drbd driver loaded OK; device status:

version: 8.3.15 (api:88/proto:86-97)

GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by mockbuild@builder17.centos.org, 2013-03-27 16:04:08

m:res  cs         ro                   ds                         p  mounted  fstype

0:r0   Connected  Secondary/Secondary  Inconsistent/Inconsistent  C

 

错误

Starting DRBD resources: Can not load the drbd module.

没有加载drbd内核模块,安装内核模块并加载即可。

  1. 6.   将master设置为主节点(只在master上执行

master主机执行命令  设置为主节点

[root@ln-master ~]# drbdadm -- --overwrite-data-of-peer primary r0   #设置为主节点

[root@ln-master ~]# mkfs.ext3 /dev/drbd0     #格式化

mke2fs 1.39 (29-May-2006)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

655360 inodes, 1309240 blocks

65462 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

16384 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 33 mounts or

180 days, whichever comes first.  Use tune2fs -c or -i to override.

[root@ln-master /]# mkdir /data

[root@ln-master /]# mount /dev/drbd0 /data/  #挂载

[root@ln-master /]# df -h

文件系统              容量  已用可用已用% 挂载点

/dev/mapper/VolGroup00-LogVol00

                       45G   14G   30G  32% /

/dev/sda1              99M   24M   70M  26% /boot

tmpfs                 3.9G     0  3.9G   0% /dev/shm

/dev/drbd0             30G  1.4G   27G   5% /data

[root@ln-master /]# drbd-overview

0:r0  Connected Primary/Secondary UpToDate/UpToDate C r-----

:看到都是UpToDate了,证明两边已经同步完成了。

  1. 7.   测试

mater操作:

[root@ln-master /]# cd /data/

[root@ln-master data]# ll

total 16

drwx------ 2 root root 16384 Aug  6 10:39 lost+found

[root@ln-master data]# touch test  #创建test文件

 [root@ln-master data]# ll

total 16

drwx------ 2 root root 16384 Aug  6 10:39 lost+found

-rw-r--r-- 1 root root     0 Aug  6 12:35 test

[root@ln-master data]# cd ..

[root@ln-master /]# umount /data/

[root@ln-master /]# df -h

文件系统              容量  已用可用已用% 挂载点

/dev/mapper/VolGroup00-LogVol00

                       45G   14G   30G  32% /

/dev/sda1              99M   24M   70M  26% /boot

tmpfs                 3.9G     0  3.9G   0% /dev/shm

[root@ln-master /]# drbdadm secondary r0  #将自己切换成从

[root@ln-master /]# drbd-overview  #检查

  0:r0  Connected Secondary/Secondary UpToDate/UpToDate C r-----

 

slave操作:

[root@ln-slave /]# drbd-overview       

  0:r0  Connected Secondary/Secondary UpToDate/UpToDate C r-----

[root@ln-slave /]# drbdadm primary r0  #将自己提升为主

[root@ln-slave /]# drbd-overview    

  0:r0  Connected Primary/Secondary UpToDate/UpToDate C r-----

[root@ln-slave /]# mount /dev/drbd0 /data/

[root@ln-slave /]# cd /data/

[root@ln-slave data]# ll

total 16

drwx------ 2 root root 16384 Aug  6  2014 lost+found

-rw-r--r-- 1 root root     0 Aug  6  2014 test

以上如果在slave端看到了test文件,证明数据已经同步了。

 

注:将master 还原成主,再做下面的操作。

 

安装配置mysql(两台都要装)

安装mysql:

#创建mysql用户

useradd mysql -s /sbin/nologin –M

id mysql

#安装

tar zxf mysql-5.1.49.tar.gz

cd mysql-5.1.49

#配置

./configure --prefix=/usr/local/mysql-5.1.49 --with-unix-socket-path=/usr/local/mysql-5.1.49/tmp/mysql.sock --localstatedir=/data --enable-assembler --with-charset=utf8 --with-collation=utf8_general_ci --with-plugins=innobase --enable-thread-safe-client --with-mysqld-user=mysql --with-big-tables --without-debug --with-pthread --enable-assembler --with-extra-charsets=complex --with-readline --with-ssl --with-embedded-server --enable-local-infile --with-plugins=partition,innobase --with-mysqld-ldflags=-all-static --with-client-ldflags=-all-static

#拷贝启动脚本,配置文件

/bin/cp support-files/mysql.server /etc/init.d/mysqld

/bin/cp support-files/my-small.cnf /etc/my.cnf

chmod 700 /etc/init.d/mysqld

#做软连接

ln -s /usr/local/mysql-5.1.49/ /usr/local/mysql

#主库初始化

/application/tools/mysql-5.1.49/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/data/mysql/data --user=mysql      #备库不需要初始化

 

mysql程序路径:/usr/local/mysql

mysql data目录:/data/mysql/data

my.cnf配置文件(两边相同),根据机器配置优化,以下配置仅供参考

[root@ln-master mysql]# cat /etc/my.cnf
[client]
port = 3306

[mysqld]
basedir=/usr/local/mysql
datadir=/data/mysql/data
socket=/tmp/mysql.sock

sync_binlog = 0
binlog_format = ROW

skip-locking

skip-name-resolve
skip-host-cache
default-character-set=utf8
default-collation=utf8_general_ci
skip-character-set-client-handshake

max_allowed_packet = 16M
table_cache = 128
sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 2M


default-storage-engine=INNODB
log-bin=mysql-bin
max_connections=5000
max_connect_errors=100000
log_slow_queries=slow.log
long_query_time=2
log_queries_not_using_indexes=0
#skip-federated
server-id= 10
table_lock_wait_timeout=180
innodb_lock_wait_timeout=180

innodb_data_file_path = ibdata1:1000M:autoextend
#innodb_buffer_pool_size = 1G
innodb_additional_mem_pool_size = 8M
innodb_log_file_size = 100M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 2
innodb_thread_concurrency=0
transaction-isolation=READ-COMMITTED
innodb_doublewrite=1
innodb_flush_method=O_DIRECT


[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash

[isamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

 

 

安装配置heartbeat

1.添加主机路由

master:

route add -host 192.168.1.11 dev eth1

slave:

route add -host 192.168.1.10 dev eth1

添加到/etc/rc.local.

2.安装heartbeat

yum install -y heartbeat

3.配置heartbeat

heartbeat会有三个配置文件ha.cfharesourcesauthkeys(本实验主备节点三个配置文件必须相同)

 

ha.cf主配置文件:

[root@ln-master ha.d]# cat ha.cf

logfile /var/log/ha-log     #日志名字及存放位置

keepalive 2                #设定心跳检测时间2秒

deadtime 15               #死亡时间15秒,备用节点15秒没有检测到主节点心跳,确认对方故障

warntime 10                #警告次数

initdead 30                #守护进程启动30s后启动服务资源

udpport 694                #使用ucast或bcast的udp通讯端口,默认694

bcast   eth1               #广播通讯接口,ucast得指定ip地址

auto_failback off              #当主节点切换到备份节点后,主节点又恢复正常,此处定义不进行回切操作,因为回切一次,NFS和mysql等成本很高      

#watchdog /dev/watchdog

node    ln-master

node    ln-slave

ping 10.10.206.1

authkeys验证文件:

[root@ln-master ha.d]# cat authkeys

auth 1                  #使用crc验证方式,这种方式不需要秘钥,因此性能比较好,还有其他两种安全依次增高,性能依次降低

1 crc

[root@ln-master ha.d]# ll authkeys    #必须为600权限

-rw------- 1 root root 31 08-12 17:49 authkeys

haresources配置文件:

[root@ln-master ha.d]# cat haresources

ln-master IPaddr::10.10.206.211 drbddisk::r0  Filesystem::/dev/drbd0::/data::ext3 mysqld

说明:

IPaddr::10.10.206.211   #VIP

drbddisk::r0     #启动drbd r0资源,相当于执行/etc/ha.d/resource.d/drbddisk r0 stop/start操作

Filesystem::/dev/drbd0::/data::ext3     #drbd分区挂载到/data目录,相当于执行/etc/ha.d/resource.d/Filesystem /dev/drbd0 /data ext3 stop/start 

mysqld             #启动mysql服务脚本,相当于/etc/init.d/mysqld stop/start

 

 

4.启动heartbeat(两边都要启动)

[root@ln-master ~]# /etc/init.d/heartbeat start

Starting High-Availability services:

2014/08/13_10:25:01 INFO:  Resource is stopped

                                                           [确定]

[root@ln-master ~]# ip add       

1: lo: mtu 16436 qdisc noqueue

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

    inet6 ::1/128 scope host

       valid_lft forever preferred_lft forever

2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000

    link/ether 00:50:56:97:39:7c brd ff:ff:ff:ff:ff:ff

    inet 10.10.206.193/24 brd 10.10.206.255 scope global eth0

    inet 10.10.206.211/24 brd 10.10.206.255 scope global secondary eth0:0  #VIP也起来了

    inet6 fe80::250:56ff:fe97:397c/64 scope link

       valid_lft forever preferred_lft forever

 

 

测试(启动heartbeat后)

master

drbd自动成为了主,mysql也启动了。

root@ln-master ~]# ip add|grep "10.10"

    inet 10.10.206.193/24 brd 10.10.206.255 scope global eth0

    inet 10.10.206.211/24 brd 10.10.206.255 scope global secondary eth0:0

[root@ln-master ~]# drbd-overview

  0:r0  Connected Primary/Secondary UpToDate/UpToDate C r----- /data ext3 30G 1.

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