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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_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
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_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
导入主库数据
#mysql -uroot -p 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
作者“linux运维”
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