mysql双主复制及使用keepalived作高可用的配置详解

#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_table

log_slave_updates
expire_logs_days=7
auto_increment_increment=2
auto_increment_offset=2
binlog_format=mixed
log-bin=mysql-bin
server-id       = 8

[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

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';

#mysqldump -uroot -p --single-transaction --flush-logs --master-data=2 --all-databases > all.sql
192.168.45.239

#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_table

log_slave_updates
expire_logs_days=7
auto_increment_increment=2
auto_increment_offset=1
binlog_format=mixed
log-bin=mysql-bin
server-id       = 9

[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

#mysql -uroot -p < all.sql

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;

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;

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

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
     }
}

#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

chmod 755  /root/keepalived_check_mysql.sh

# 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
     }
}

/etc/init.d/keepalived start
/etc/init.d/mysqld start

/etc/init.d/keepalived start
/etc/init.d/mysqld start