mysql双机热备+heartbeat集群+自动故障转移

环境说明：本环境由两台mysql 数据库和heartbeat 组成，一台的ip

为 192.168.10.197，一台为192.168.10.198，对外提供服务的vip

为192.168.10.200

备注：heartbeat 本身是不能做到服务不可用自动切换的，所以用结合

额外的脚本才可以做到，本文中提到的moniter 脚本即为实现某个

mysql 服务不可用的时候自动切换的还可以自动报警

安装和配置过程分为如下几步：

第一部分：mysql 的安装配置

1 安装

1.1. 添加mysql 运行所需的用户和组

groupadd mysql

useradd -g mysql mysql

1.2. 解压安装

tar mysql-5.1.26-rc-linux-x86_64-glibc23.tar.gz

mv mysql-5.1.26-rc-linux-x86_64-glibc23 /usr/local/mysql/

chown -R mysql:mysql /usr/local/mysql

1.3. 复制主配置文件和启动脚本

cd /usr/local/mysql

cp support-files/my-medium.cnf /etc/my.cf

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

chmod +x /etc/init.d/mysqld

1.4. 初始化数据库

cd /usr/local/mysql

scripts/mysql_install_db --user=mysql

1.5. 更改数据目录的所有者和组

chown -R mysql:mysql ./data

1.6. 注册mysql 为系统服务

chkconfig --add mysqld

chkconfig --levels 2345 mysqld on

1.7. 输出环境变量

#Vi /etc/profile(内容如下)

PATH=$PATH:/usr/local/mysql/bin

# source /etc/profile

1.8. 设置数据库密码

service mysqld start

mysqladmin password 123456（密码自己定这里只是个例子）

1.9. 开启root 远程访问权限

mysql –p123456

mysql> grant all on *.* to root@'%' identified by '123456';

Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

mysql> quit

2 参数设置

2.1. 创建相关目录并设置权限

mkdir /usr/local/mysql/binlog/

chown –R mysql:mysql /usr/local/mysql/binlog/

touch /var/log/mysql.log

chown –R mysql:mysql /var/log/mysql.log

2.2. 添加同步复制的账号（主库和辅库的设置相同）

[root@master ~]# mysql -p

Enter password:（输入root 密码）

mysql> grant all on *.* to qiangao identified by '123456';（其中的账号和密码要

和配置文件中指定的相同）

mysql> flush privileges;

2.3. 修改主配置文件

注意：其中ip 要互相指向对方的ip 按实际情况来设定，用户名和密码要和上文的用户名密码保持一致主库设置

vi /etc/my.cnf（用如下内容覆盖原有内容）

################################################

##########

[client]

port = 3306

socket = /tmp/mysql.sock

[mysqld]

################### auto_increment

###########################

auto_increment_offset = 1

auto_increment_increment = 2

############## other options ##############

default-character-set = utf8

default-storage-engine = InnoDB

default-table-type = INNODB

max_connections = 800

port = 3306

socket = /tmp/mysql.sock

skip-locking

########## MyISAM options #################

myisam_max_sort_file_size = 10G

myisam_max_extra_sort_file_size = 10G

myisam_sort_buffer_size = 10M

myisam_repair_threads = 1

################ select cache options ##################

read_buffer_size = 2M

read_rnd_buffer_size = 16M

bulk_insert_buffer_size = 5M

max_allowed_packet = 1M

table_cache = 2048

query_cache_size = 32M

query_cache_limit = 2M

sort_buffer_size = 8M

join_buffer_size = 8M

thread_concurrency = 8

################ index cache options ##################

key_buffer_size = 32M

key_buffer_size = 32M

################# master #########################

server-id = 1

log-bin=/usr/local/mysql/binlog/master-bin

binlog_format=mixed

relay-log=/usr/local/mysql/binlog/mysqld-relay-bin

##################### slave

##########################

relay-log=/usr/local/mysql/binlog/slave-relay-bin

master-host=192.168.10.198

master-user=qiangao

master-password=123456

master-connect-retry=10

############## log ##################

log-error=/var/log/mysql.log

######### INNODB #########

innodb_file_per_table

#+++++++ log ++++++++#

innodb_log_buffer_size = 10M

innodb_mirrored_log_groups = 1

innodb_log_files_in_group = 3

innodb_log_file_size = 50M

innodb_flush_log_at_trx_commit = 0

#innodb_log_archive = 0

#+++++++ System buffer +++++++#

innodb_buffer_pool_size = 1024M

innodb_additional_mem_pool_size = 40M

#+++++++ Other +++++++#

innodb_file_io_threads = 4

innodb_lock_wait_timeout = 5

innodb_force_recovery = 0

innodb_fast_shutdown = 1

innodb_thread_concurrency = 8

innodb_lock_wait_timeout = 50

transaction-isolation = READ-COMMITTED

[mysqldump]

quick

max_allowed_packet = 16M

[mysql]

no-auto-rehash

# Remove the next comment character if you are not familiar with SQL

#safe-updates

[isamchk]

key_buffer = 128M

sort_buffer_size = 128M

read_buffer = 2M

write_buffer = 2M

[myisamchk]

key_buffer = 128M

sort_buffer_size = 128M

read_buffer = 2M

write_buffer = 2M

[mysqlhotcopy]

interactive-timeout

辅库设置

vi /etc/my.cnf（用如下内容覆盖原有内容，）

################################################

##########

[client]

port = 3306

socket = /tmp/mysql.sock

[mysqld]

################### auto_increment

###########################

auto_increment_offset = 1

auto_increment_increment = 2

############## other options ##############

default-character-set = utf8

default-storage-engine = InnoDB

default-table-type = INNODB

max_connections = 800

port = 3306

socket = /tmp/mysql.sock

skip-locking

########## MyISAM options #################

myisam_max_sort_file_size = 10G

myisam_max_extra_sort_file_size = 10G

myisam_sort_buffer_size = 10M

myisam_repair_threads = 1

################ select cache options ##################

read_buffer_size = 2M

read_rnd_buffer_size = 16M

bulk_insert_buffer_size = 5M

max_allowed_packet = 1M

table_cache = 2048

query_cache_size = 32M

query_cache_limit = 2M

sort_buffer_size = 8M

join_buffer_size = 8M

thread_concurrency = 8

################ index cache options ##################

key_buffer_size = 32M

key_buffer_size = 32M

################# master #########################

server-id = 2

log-bin=/usr/local/mysql/binlog/master-bin

binlog_format=mixed

relay-log=/usr/local/mysql/binlog/mysqld-relay-bin

##################### slave

##########################

relay-log=/usr/local/mysql/binlog/slave-relay-bin

master-host=192.168.10.197

master-user=qiangao

master-password=123456

master-connect-retry=10

############## log ##################

log-error=/var/log/mysql/error.log

######### INNODB #########

innodb_file_per_table

#+++++++ log ++++++++#

innodb_log_buffer_size = 10M

innodb_mirrored_log_groups = 1

innodb_log_files_in_group = 3

innodb_log_file_size = 50M

innodb_flush_log_at_trx_commit = 0

#innodb_log_archive = 0

#+++++++ System buffer +++++++#

innodb_buffer_pool_size = 1024M

innodb_additional_mem_pool_size = 40M

#+++++++ Other +++++++#

innodb_file_io_threads = 4

innodb_lock_wait_timeout = 5

innodb_force_recovery = 0

innodb_fast_shutdown = 1

innodb_thread_concurrency = 8

innodb_lock_wait_timeout = 50

transaction-isolation = READ-COMMITTED

[mysqldump]

quick

max_allowed_packet = 16M

[mysql]

no-auto-rehash

# Remove the next comment character if you are not familiar with SQL

#safe-updates

[isamchk]

key_buffer = 128M

sort_buffer_size = 128M

read_buffer = 2M

write_buffer = 2M

[myisamchk]

key_buffer = 128M

sort_buffer_size = 128M

read_buffer = 2M

write_buffer = 2M

[mysqlhotcopy]

interactive-timeout

2.4. 重新启动服务

service mysqld restart

3 防火墙是设置

注意主库和辅库的防火墙设置是一样的

iptables -I INPUT -p tcp --dport 3306 -j ACCEPT

service iptables save

第二部分：heartbeat 的安装和配置

两台主机硬件环境(不必完全一致)：

eth0: 对外IP

eth1: 对内IP(HA 专用)

两台主机的eht1 使用双机对联线直接连接。

【二】安装前网络环境设定：

================================================

========

node1: 主机名：master.qiangao.com

eth0: 192.168.10.197 //对外IP 地址

eth1: 172.16.1.3 //HA 心跳使用地址

---------------------------

node2: 主机名：slave.qiangao.com

eth0: 192.168.10.198 //对外IP 地址

eth1: 172.16.1.4 //HA 心跳使用地址

特别注意要检查以下几个文件：

/etc/hosts

/etc/host.conf

/etc/resolv.conf

/etc/sysconfig/network

/etc/sysconfig/network-scripts/ifcfg-eth0

/etc/sysconfig/network-scripts/ifcfg-eth1

/etc/nsswitch.conf

#vi /etc/hosts

node1 的hosts 内容如下：

127.0.0.1 master.qiangao.com master localhost.localdomain localhost

192.168.10.197 master.qiangao.com

192.168.10.198 slave.qiangao.com

::1 localhost6.localdomain6 localhost6

---------------------------

node2 的hosts 内容如下:

127.0.0.1 slave.qiangao.com slave localhost.localdomain localhost

192.168.10.197 master.qiangao.com

192.168.10.198 slave.qiangao.com

::1 localhost6.localdomain6 localhost6

#cat /etc/host.conf

order hosts,bind

#cat /etc/resolv.conf

nameserver 202.96.134.133 //DNS 地址

#cat /etc/sysconfig/network

NETWORKING=yes

HOSTNAME= master.qiangao.com //主机名

GATEWAY="192.168.10.1" //网关

GATEWAY="eth0" //网关使用网卡

ONBOOT=YES //启动时加载

FORWARD_IPV4="yes" //只允许IPV4

---------------------------

#cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

ONBOOT=yes

BOOTPROTO=static

IPADDR=192.168.10.197

NETMASK=255.255.255.0

GATEWAY=192.168.10.1

TYPE=Ethernet

IPV6INIT=no

---------------------------

#cat /etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1

ONBOOT=yes

BOOTPROTO=none

IPADDR=172.16.1.3

NETMASK=255.255.0.0

TYPE=Ethernet

[node1] 与 [node2] 在上面的配置中，除了

/etc/hosts

/etc/sysconfig/network

/etc/sysconfig/network-scripts/ifcfg-eth0

/etc/sysconfig/network-scripts/ifcfg-eth1

要各自修改外，其他一致。

配置完成后，试试在各自主机上ping 对方的主机名，应该可以ping 通:

[root@master ~]# ping slave.qiangao.com

PING slave.qiangao.com (192.168.10.198) 56(84) bytes of data.

64 bytes from slave.qiangao.com (192.168.10.198): icmp_seq=1 ttl=64

time=0.136 ms

【三】安装HA 与HA 依赖包

================================================

===========

yum install heartbeat

yum install ipvsadm

yum install libnet

【四】 配置 HA 的各配置文件

首先复制配置文件到/etc 目录

cd /usr/share/doc/heartbeat-2.1.3

cp ha.cf haresources /etc/ha.d/

cp authkeys /etc/ha.d/

================================================

===========

配置心跳的加密方式:authkeys

如果使用双机对联线(双绞线)，可以配置如下：

#vi /etc/hc.d/authkeys

auth 1

1 crc

存盘退出，然后

#chmod 600 authkeys

================================================

===========

配置心跳的监控：haresources

创建检测脚本（本处如果没有个监测脚本hearbeat 无法启动）

vi /etc/init.d/test(内容如下)

#!/bin/bash

echo "" $>/dev/null

chmod 777 /etc/init.d/test

================================================

===========

#vi /etc/ha.d/haresources(配置资源文件)

各主机这部分应完全相同。

master.qiangao.com 192.168.10.200 test

指定 master.qiangao.com 调用预先写好的一个测试脚本，系统附加一个虚拟IP

192.168.10.200 给eth0:0

这里如果master.qiangao.com 宕机后slave.qiangao.com 可以新分配IP

192.168.10.200

================================================

===========

配置心跳的配置文件：ha.cf

#vi /etc/ha.d/ha.cf

logfile /var/log/ha_log/ha-log.log ## ha 的日志文件记录位置。如没有

该目录，则需要手动添加

bcast eth1 ##使用eht1 做心跳监测

keepalive 2 ##设定心跳(监测)时间时间为2 秒

warntime 4####警告时间

deadtime 6#########确定服务以死的时间

initdead 30

hopfudge 1

udpport 694 ##使用udp 端口694 进行心跳监测

auto_failback on

node master.qiangao.com ##节点1，必须要与 uname -n 指令得到的结果一致。

node slave.qiangao.com ##节点2

ping 172.16.1.04 ##通过ping 对方来监测心跳是否正常。

respawn hacluster /usr/lib64/heartbeat/ipfail(因操作系统而异)

apiauth ipfail gid=haclient uid=hacluster

debugfile /var/logs/ha-debug.log

---------------------------

【五】 HA 服务的启动、关闭

[root@master ha.d]# chkconfig --add heartbeat

[root@master ha.d]# chkconfig --levels 2345 heartbeat on

启动HA: service heartbeat start

关闭HA; service heartbeat stop

【六】 防火墙设置

================================================

====

heartbeat 默认使用udp 694 端口进行心跳监测。 如果系统有使用iptables 做

防火墙，应记住把这个端口打开。

#vi /etc/sysconfig/iptables

加入以下内容（互相指向对方ip）

-A RH-Firewall-1-INPUT -p udp -m udp --dport 694 -d 172.16.1.4 -j ACCEPT

意思是udp 694 端口对 对方的心跳网卡地址 172.16.1.4 开放。

#service iptables restart

重新加载iptables。

第三部分：监控脚本

cat /usr/local/mysql/bin/moniter.sh

#!/bin/bash

mysql_path=/usr/local/mysql/bin/

user="root"

password="123456"

email="qubq@qian-gao.com"

logfile=/var/log/moniter.log

date=`(date +%y-%m-%d--%H:%M:%S)`

sleeptime=30

ip=$(/sbin/ifconfig | grep "inet addr" | grep -v "127.0.0.1" | awk '{print $2;}' |

awk -F':' '{print $2;}' | head -1)

Slave_IO_Running=$(mysql -u$user -p$password -e 'show slave status\G' |

grep "Slave_IO_Running" | awk '{print $2}')

Slave_SQL_Running=$(mysql -u$user -p$password -e 'show slave status\G' |

grep "Slave_SQL_Running" | awk '{print $2}')

echo "plese fix the server of $ip error now!" >$mysql_path/letter

letter=$mysql_path/letter

mysql -p$password -e "use test;"

if [[ $? != 0 ]]

then

mail -s "{$ip}_database connect lost the srcprits fix it now "

$email<$letter

killall -9 heartbeat

killall -9 mysqld

/etc/init.d/mysqld start

sleep $sleeptime

mysql -p$password -e "use test;"

if [ $? == 0 ]

then

echo

"==============>$date<=====================">>$logfile

mail -s "{$ip}_database up now " $email

sleep $sleeptime

service heartbeat start

sleep $sleeptime

netstat -an |grep udp |grep 694

if [ $? == 0 ]

then

echo "complete!">>$logfile

else

mail -s "{$ip} heartbeat can't to up please fix it !"

$email<$letter

fi

else

mail -s "{$ip}_database cant't to up plese fix it" $email

fi

else

if [ "$Slave_IO_Running" = "Yes" -a "$Slave_SQL_Running" =

"Yes" ]

then

echo "Slave is running!" >/dev/null

else

echo

"==============>$date<=====================">>$logfile

echo "Slave is not running!" >> $logfile

/bin/mail -s "{$ip}_replicate error please fix it "

$email<$letter

fi

fi

然后设置自动化任务每2分钟检测一次就可以了，现在就可以实现双机热备了