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实验架构图：
操作系统:centos6.6
masterA IP:192.168.166.161
masterB ip:192.168.166.162
应用软件
mysql-5.5.42.tar.gz
keepalived-1.2.12.tar.gz
wget http://mirrors.sohu.com/mysql/MySQL-5.5/mysql-5.5.42.tar.gz
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#useradd -r mysql -s /sbin/nologin #mkdir -p /data/mysql/{data,binlog,relaylog} #chown mysql:mysql -R /data/mysql #tar xf mysql-5.5.42.tar.gz #cd mysql-5.5.42 # cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql \ -DMYSQL_DATADIR=/data/mysql/data \ -DMYSQL_DATADIR=/etc \ -DWITH_INNOBASE_STORAGE_ENGINE=1 \ -DWITH_ARCHIVE_STORAGE_ENGINE=1 \ -DWITH_BLACKHOLE_STORAGE_ENGINE=1 \ -DDEFAULT_CHARSET=utf8 \ -DDEFAULT_COLLATION=utf8_general_ci \ -DWITH_ZLIB=system \ -DMYSQL_UNIX_ADDR=/tmp/mysql.sock \ -DWITH_LIBWRAP=0 \ -DWITH_READLINE=1 \ -DSYSCONFDIR=/etc \ -DMYSQL_TCP_PORT=3306 # #会编译不过去，提示需要安装ncurses-devel #yum -y install ncurses-devel gcc gcc-c++ bison #rm -f CMakeCache.txt 重新执行cmake
#make && make install
#cd /usr/local/mysql #chown -R mysql:mysql * # cp support-files/mysql.server /etc/rc.d/init.d/mysqld #chmod +x /etc/init.d/mysqld #chkconfig -add mysqld #chkconfig mysqld on # vim /etc/profile 添加PATH=$PATH:/usr/local/mysql/bin # . /etc/profile(或者export PATH=$PATH:/usr/local/mysql/bin) # ln -sv /usr/local/mysql/include/ /usr/include/mysql # echo ‘/usr/local/mysql/lib‘ > /etc/ld.so.conf.d/mysql.conf 加载库文件 # ldconfig -v |grep mysql # vim /etc/man.config 添加一行MANPATH /usr/local/mysql/man
# cd /usr/local/mysql # scripts/mysql_install_db --user=mysql --datadir=/data/mysql/data
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将如下配置拷贝到/etc/my.cnf
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[client] default-character-set = utf8 port=3306 socket = /tmp/mysql.sock [mysqld] user = mysql port=3306 socket = /tmp/mysql.sock basedir = /usr/local/mysql datadir=/data/mysql/data pid-file = /data/mysql/mysql.pid log-error = /data/mysql/mysql-error.log #max_connections=1000 #log_slave_update =1 log-bin = /data/mysql/binlog/mysql-bin log-bin-index = /data/mysql/binlog/mysql-bin.index binlog_format = mixed binlog_cache_size = 4M max_binlog_cache_size = 8M max_binlog_size = 1G expire_logs_days = 30 #不需要同步的数据，且不记录到binlog中。 binlog-do-db=small binlog-ignore-db=mysql replicate-do-db=small replicate-ignore-db=mysql #同步参数: #保证slave挂在任何一台master上都会接收到另一个master的写入信息 log-slave-updates slave-skip-errors=all sync_binlog=1 auto_increment_offset=1 auto_increment_increment=2 key_buffer_size = 384M sort_buffer_size = 2M read_buffer_size = 2M read_rnd_buffer_size =16M join_buffer_size =2M thread_cache_size = 300 query_cache_limit = 2M query_cache_min_res_unit =2K thread_concurrency = 8 table_cache =614 table_open_cache = 512 open_files_limit = 10240 back_log = 600 max_connections = 5000 max_connect_errors = 6000 external-locking = FALSE max_allowed_packet =16M default_storage_engine = MyISAM #default_storage_engine = InnoDB thread_stack =192K transaction_isolation = REPEATABLE-READ tmp_table_size = 256M max_heap_table_size =512M bulk_insert_buffer_size = 64M myisam_sort_buffer_size = 64M myisam_max_sort_file_size = 10G myisam_repair_threads = 1 myisam_recover long_query_time = 2 slow_query_log = on slow_query_log_file = /data/mysql/slow.log log-queries-not-using-indexes =on log-slow-admin-statements skip-name-resolve skip-external_locking log_bin_trust_function_creators=1 #skip-networking #skip-innodb innodb_additional_mem_pool_size = 16M innodb_buffer_pool_size = 512M innodb_data_file_path = ibdata1:256M:autoextend innodb_file_io_threads = 4 innodb_thread_concurrency = 8 innodb_flush_log_at_trx_commit =2 innodb_log_file_size =128M innodb_log_files_in_group = 3 innodb_max_dirty_pages_pct = 90 innodb_lock_wait_timeout =240 innodb_file_per_table = 0 innodb_status_file = 1 interactive_timeout=120 wait_timeout=120 server-id=1 #innodb_flush_logs_at_trx_commit=1 [mysqldump] quick max_allowed_packet = 64M [mysql] no-auto-rehash [myisamchk] key_buffer_size = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M
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将如下配置拷贝到/etc/my.cnf
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[client] default-character-set = utf8 port=3306 socket = /tmp/mysql.sock [mysqld] user = mysql port=3306 socket = /tmp/mysql.sock basedir = /usr/local/mysql datadir=/data/mysql/data pid-file = /data/mysql/mysql.pid log-error = /data/mysql/mysql-error.log #max_connections=1000 #log_slave_update =1 log-bin = /data/mysql/binlog/mysql-bin log-bin-index = /data/mysql/binlog/mysql-bin.index binlog_format = mixed binlog_cache_size = 4M max_binlog_cache_size = 8M max_binlog_size = 1G expire_logs_days = 30 #需要同步的数据库 binlog-do-db=small binlog-ignore-db=mysql replicate-do-db=small replicate-ignore-db=mysql log-slave-updates slave-skip-errors=all sync_binlog=1 auto_increment_increment=2 auto_increment_offset=2 key_buffer_size = 384M sort_buffer_size = 2M read_buffer_size = 2M read_rnd_buffer_size =16M join_buffer_size =2M thread_cache_size = 300 query_cache_limit = 2M query_cache_min_res_unit =2K thread_concurrency = 8 table_cache =614 table_open_cache = 512 open_files_limit = 10240 back_log = 600 max_connections = 5000 max_connect_errors = 6000 external-locking = FALSE max_allowed_packet =16M default_storage_engine = MyISAM #default_storage_engine = InnoDB thread_stack =192K transaction_isolation = REPEATABLE-READ tmp_table_size = 256M max_heap_table_size =512M bulk_insert_buffer_size = 64M myisam_sort_buffer_size = 64M myisam_max_sort_file_size = 10G myisam_repair_threads = 1 myisam_recover long_query_time = 2 slow_query_log = on slow_query_log_file = /data/mysql/slow.log log-queries-not-using-indexes =on log-slow-admin-statements skip-name-resolve skip-external_locking log_bin_trust_function_creators=1 #skip-networking #skip-innodb innodb_additional_mem_pool_size = 16M innodb_buffer_pool_size = 512M innodb_data_file_path = ibdata1:256M:autoextend innodb_file_io_threads = 4 innodb_thread_concurrency = 8 innodb_flush_log_at_trx_commit =2 innodb_log_file_size =128M innodb_log_files_in_group = 3 innodb_max_dirty_pages_pct = 90 innodb_lock_wait_timeout =240 innodb_file_per_table = 0 innodb_status_file = 1 interactive_timeout=120 wait_timeout=120 server-id=2 [mysqldump] quick max_allowed_packet = 64M [mysql] no-auto-rehash [myisamchk] key_buffer_size = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M
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masterA: Mysql>grant replication slave on *.* to rpuser1@192.168.166.162 identified by ‘123456‘; Mysql> flush privileges; masterB: Mysql>grant replication slave on *.* to rpuser2@192.168.166.161 identified by ‘123456‘; Mysql> flush privileges;
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Master A：
mysql> show master status\G *************************** 1. row *************************** File: mysql-bin.000001 Position: 347 Binlog_Do_DB: small Binlog_Ignore_DB: mysql 1 row in set (0.00 sec)
master B：
mysql> show master status\G *************************** 1. row *************************** File: mysql-bin.000001 Position: 347 Binlog_Do_DB: small Binlog_Ignore_DB: mysql 1 row in set (0.00 sec) |
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Master A： mysql> change master to -> master_host=‘192.168.166.162‘, -> master_user=‘rpuser2‘, -> master_password=‘123456‘, -> master_log_file=‘mysql-bin.000001‘, -> master_log_pos=347;
Master B： mysql> change master to -> master_host=‘192.168.166.161‘, -> master_user=‘rpuser1‘, -> master_password=‘123456‘, -> master_log_file=‘mysql-bin.000001‘, -> master_log_pos=347;
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Master A: Mysql>show slave status \G Slave_IO_Running: Yes 这两个为yes表示正常 Slave_SQL_Running: Yes
Master B: Mysql>show slave status \G Slave_IO_Running: Yes 这两个为yes表示正常 Slave_SQL_Running: Yes
Master A: 创建数据库 create databases small;
Master B:
mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | small | | test | +--------------------+ 5 rows in set (0.05 sec)
可以发现数据库small
Master B: 在small数据库里创建一张表，T1： mysql> create table T1 select * from mysql.user; Query OK, 7 rows affected (0.08 sec) Records: 7 Duplicates: 0 Warnings: 0
Master A：
查看small下面有T1这个表格： mysql> use small; No connection. Trying to reconnect... Connection id: 10 Current database: *** NONE ***
Database changed mysql> show tables; +-----------------+ | Tables_in_small | +-----------------+ | T1 | +-----------------+ 1 row in set (0.00 sec)
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wget http://www.keepalived.org/software/keepalived-1.2.12.tar.gz
需要在两台服务器上安装keepalived，这里拿Master A安装过程举例
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#tar xf keepalived-1.2.12.tar.gz #cd keepalived-1.2.12 #yum –y install openssl-devel kernel-devel #./configure --sysconf=/etc --with-kernel-dir=/usr/src/kernels/2.6.32-504.el6.x86_64/ #make #make install
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Master A： global_defs { notification_email { root@localhost } notification_email_from keepalived.example.com router_id MySQL_HA }
vrrp_script check_mysqld { script "/etc/keepalived/check_slave.pl 127.0.0.1" interval 2 weight 21 }
vrrp_instance HA_1 { state BACKUP //master A和master B上均配置为BACKUP interface eth0 virtual_router_id 80 priority 100 advert_int 2 nopreempt //不抢占模式，只在优先级高的机器上设置即可，优先级低的机器可以不设置。
authentication { auth_type PASS auth_pass 23b14455cd } track_script { check_mysqld } virtual_ipaddress { 192.168.166.254 } }
其中，/etc/keepalived/check_slave.sh 脚本内容为：
#!/bin/bash ####################################### # this script function is : # check_mysql_slave_replication_status # # User YYYY-MM-DD - ACTION # mlx 2013-12-29 - Created # mail 552326439@qq.com #######################################
HOST_IP=localhost HOST_PORT=3306 MYUSER=root MYPASS="123456" MYSOCK=/tmp/mysql.sock MYSQL_PATH=/usr/local/mysql/bin MYSQL_CMD="$MYSQL_PATH/mysql -u$MYUSER -p$MYPASS -S $MYSOCK" CHECKNUM=123 MYSQL1=$($MYSQL_CMD -N -s -e "select ${CHECKNUM}") if [ $? -ne 0 ] || [ "${MYSQL1}" -ne "${CHECKNUM}" ];then /etc/init.d/keepalived stop exit 1 else
SlaveStatusArr=($($MYSQL_CMD -e "show slave status \G"|egrep "_Behind|_Running"|awk ‘{print $NF}‘)) if [ "${SlaveStatusArr[0]}" = "No" ] || [ "${SlaveStatusArr[1]}" = "No" ];then /etc/init.d/keepalived stop fi fi 说明：此监控脚本可以检测mysql服务是否启动和mysql主从同步是否正常。
Master B： global_defs { notification_email { root@localhost } notification_email_from keepalived.example.com router_id MySQL_HA }
vrrp_script check_mysqld { script "/etc/keepalived/check_slave.pl 127.0.0.1" interval 2 weight 21 }
vrrp_instance HA_1 { state BACKUP //master A和master B上均配置为BACKUP interface eth0 virtual_router_id 80 priority 90 advert_int 2
authentication { auth_type PASS auth_pass 23b14455cd } track_script { check_mysqld } virtual_ipaddress { 192.168.166.254 } }
其中，/etc/keepalived/check_slave.pl 脚本内容为： #!/bin/bash ####################################### # this script function is : # check_mysql_slave_replication_status # # User YYYY-MM-DD - ACTION # mlx 2013-12-29 - Created # mail 552326439@qq.com #######################################
HOST_IP=localhost HOST_PORT=3306 MYUSER=root MYPASS="123456" MYSOCK=/tmp/mysql.sock MYSQL_PATH=/usr/local/mysql/bin MYSQL_CMD="$MYSQL_PATH/mysql -u$MYUSER -p$MYPASS -S $MYSOCK" CHECKNUM=123 MYSQL1=$($MYSQL_CMD -N -s -e "select ${CHECKNUM}") if [ $? -ne 0 ] || [ "${MYSQL1}" -ne "${CHECKNUM}" ];then /etc/init.d/keepalived stop exit 1 else
SlaveStatusArr=($($MYSQL_CMD -e "show slave status \G"|egrep "_Behind|_Running"|awk ‘{print $NF}‘)) if [ "${SlaveStatusArr[0]}" = "No" ] || [ "${SlaveStatusArr[1]}" = "No" ];then /etc/init.d/keepalived stop fi fi
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Master A: #cp /usr/local/sbin/keepalived /usr/sbin/ #service keepalived start #chkconfig –level 2345 keepalived on
Master B: #cp /usr/local/sbin/keepalived /usr/sbin/ #service keepalived start #chkconfig –level 2345 keepalived on
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我们在webserver这台主机上用mysql客户端连接vip：192.168.166.254
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#mysql -uroot -p123456 -h 192.168.166.254
说明：此时vip地址在Master B 这台服务器上。
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故障模拟，我们这时手动停掉192.168.166.254的MySQL复制线程
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mysql>stop slave;
这里可以看到，当停掉复制线程后，执行查询时连接中断了一次，马上再次连接上完成查询，显示的server_id已经变成1了，表示服务器已经切换了。
查看master A服务器的IP地址验证VIP是否转移过来了
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5.模拟网线故障
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手动停掉master A 服务武器eth0网卡 #ifdown eth0
说明：vip地址已经转到Master B服务器上，并且mysql服务已经做了故障转移 |
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原文地址：http://www.cnblogs.com/liqing1009/p/4913351.html
