mysql双主复制并利用keepalived做高可用
1、架构
vip 192.168..45.244
mysql-1:192.168.45.238
mysql-2:192.168.45.239
2、mysql双主设置
192.168.45.238
#vim /etc/my.cnf [client] port = 3306 socket = /tmp/mysql.sock [mysqld] port = 3306 socket = /tmp/mysql.sock datadir=/usr/local/mysql/var/ skip-locking skip-name-resolve key_buffer = 64M max_allowed_packet = 64M table_cache = 2048 sort_buffer_size = 4M net_buffer_length = 256K read_buffer_size = 10M read_rnd_buffer_size = 10M myisam_sort_buffer_size = 16M interactive_timeout = 240 wait_timeout = 240 max_connections = 800 connect_timeout=30 open_files_limit=8192 query_cache_size = 1024M thread_cache_size=16 thread_concurrency = 8 long_query_time = 1 log-slow-queries = slow.log innodb_additional_mem_pool_size = 8M innodb_buffer_pool_size = 32M innodb_log_buffer_size=8M innodb_log_file_size = 256M innodb_log_files_in_group = 3 innodb_file_io_threads = 8 innodb_lock_wait_timeout= 50 innodb_thread_concurrency = 16 innodb_file_per_tableexpire_logs_days=7binlog_format=mixed[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
设置mysql复制账号
mysql>GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.45.238' IDENTIFIED BY 'repl_123'; mysql>GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.45.239' IDENTIFIED BY 'repl_123';
导出数据库
#mysqldump -uroot -p --single-transaction --flush-logs --master-data=2 --all-databases > all.sql
192.168.45.239
mysql配置
#vim /etc/my.cnf [client] port = 3306 socket = /tmp/mysql.sock [mysqld] port = 3306 socket = /tmp/mysql.sock datadir=/usr/local/mysql/var/ skip-locking skip-name-resolve key_buffer = 64M max_allowed_packet = 64M table_cache = 128 sort_buffer_size = 4M net_buffer_length = 256K read_buffer_size = 10M read_rnd_buffer_size = 10M myisam_sort_buffer_size = 64M interactive_timeout = 240 wait_timeout = 240 max_connections = 800 connect_timeout=30 open_files_limit=8192 query_cache_size = 1024M thread_cache_size=16 thread_concurrency = 8 long_query_time = 1 log-slow-queries = slow.log innodb_additional_mem_pool_size = 8M innodb_buffer_pool_size = 64M innodb_log_buffer_size=8M innodb_log_file_size = 256M innodb_log_files_in_group = 3 innodb_file_io_threads = 8 innodb_lock_wait_timeout= 50 innodb_thread_concurrency = 16 innodb_file_per_tableexpire_logs_days=7binlog_format=mixed[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
导入主库数据
#mysql -uroot -p < all.sql 设置同步 mysql> CHANGE MASTER TO MASTER_HOST='192.168.45.238',MASTER_PORT='3306',MASTER_USER='repl',MASTER_PASSWORD='repl_123',MASTER_LOG_FILE='mysql-bin.000004',MASTER_LOG_POS=106; mysql> start slave;
在192.168.45.238上设置同步
mysql>CHANGE MASTER TOMASTER_HOST='192.168.45.239',MASTER_PORT='3306',MASTER_USER='repl',MASTER_PASSWORD='repl_123',MASTER_LOG_FILE='mysql-bin.000008',MASTER_LOG_POS=105020214; mysql>start slave;
3、配置keepalived
192.168.45.238
192.168.45.239
安装keepalived
wget http://www.keepalived.org/software/keepalived-1.2.2.tar.gz tar zxvf keepalived-1.2.2.tar.gz cd keepalived-1.2.2 ./configure --prefix=/ make make install
192.168.45.238 keepalived 配置
6># vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id yuangnag.com
}
vrrp_script check_run {
script "/root/keepalived_check_mysql.sh"
interval 5
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 88
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass yuangang.net
}
track_script {
check_run
}
virtual_ipaddress {
192.168.45.244
}
}
检测mysql脚本配置(两台mysql一样的配置)
#vim #!/bin/bash
MYSQL=/usr/local/mysql/bin/mysql
MYSQL_HOST=localhost
MYSQL_USER=root
MYSQL_PASSWORD=
CHECK_TIME=3
#mysql is working MYSQL_OK is 1 , mysql down MYSQL_OK is 0
MYSQL_OK=1
function check_mysql_helth (){
$MYSQL -h $MYSQL_HOST -u $MYSQL_USER -e "show status;" >/dev/null 2>&1
if [ $? = 0 ] ;then
MYSQL_OK=1
else
MYSQL_OK=0
fi
return $MYSQL_OK
}
while [ $CHECK_TIME -ne 0 ]
do
let "CHECK_TIME -= 1"
check_mysql_helth
if [ $MYSQL_OK = 1 ] ; then
CHECK_TIME=0
exit 0
fi
if [ $MYSQL_OK -eq 0 ] && [ $CHECK_TIME -eq 0 ]
then
/etc/init.d/keepalived stop
exit 1
fi
sleep 1
done
#!/bin/bash
MYSQL=/usr/local/mysql/bin/mysql
MYSQL_HOST=localhost
MYSQL_USER=root
MYSQL_PASSWORD=
CHECK_TIME=3
#mysql is working MYSQL_OK is 1 , mysql down MYSQL_OK is 0
MYSQL_OK=1
function check_mysql_helth (){
$MYSQL -h $MYSQL_HOST -u $MYSQL_USER -e "show status;" >/dev/null 2>&1
if [ $? = 0 ] ;then
MYSQL_OK=1
else
MYSQL_OK=0
fi
return $MYSQL_OK
}
while [ $CHECK_TIME -ne 0 ]
do
let "CHECK_TIME -= 1"
check_mysql_helth
if [ $MYSQL_OK = 1 ] ; then
CHECK_TIME=0
exit 0
fi
if [ $MYSQL_OK -eq 0 ] && [ $CHECK_TIME -eq 0 ]
then
/etc/init.d/keepalived stop
exit 1
fi
sleep 1
done
chmod 755 /root/keepalived_check_mysql.sh
192.168.45.239 keepalived配置
# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id yuangang.com
}
vrrp_script check_run {
script "/root/keepalived_check_mysql.sh"
interval 5
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 88
priority 80
advert_int 1
authentication {
auth_type PASS
auth_pass yuangang.com
}
track_script {
check_run
}
virtual_ipaddress {
192.168.45.244
}
}
启动 238上的keepalived mysql
/etc/init.d/keepalived start
/etc/init.d/mysqld start
启动239上的keepalived mysql
/etc/init.d/keepalived start
/etc/init.d/mysqld start
测试，关闭238上的mysql在另外一台机器上用vip连接mysql
关闭239上的mysql在另外一台机器上用vip连接mysql
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