Mysql+Keepalived实现双主热备方式

一、Mysql安装、配置和安全启动

二、 两台Mysql配置双主

三、安装Keepalived

四、配置Keepalived

cd /usr/local/src/
tar -zxvf mysql-5.7.28-linux-glibc2.12-x86_64.tar.gz
mkdir -p /usr/local/mysql/
mv mysql-5.7.28-linux-glibc2.12-x86_64 /usr/local/mysql/mysql-5.7.28

cd /usr/local
groupadd mysql
useradd -r -g mysql -s /bin/false mysql
chown -R mysql:mysql mysql

cd /usr/local/mysql/mysql-5.7.28
bin/mysqld –initialize –user=mysql –basedir=/usr/local/mysql/mysql-5.7.28/ –datadir=/data1/mysql/data –lc_messages_dir=/usr/local/mysql/mysql-5.7.28/share –lc_messages=en_US
bin/mysql_ssl_rsa_setup –datadir=/data1/mysql/data

vi /etc/my.cnf
basedir=/usr/local/mysql/mysql-5.7.28
datadir=/data1/mysql/data

#编辑环境变量 .bash_profile表示当前用户个人配置 只对当前用户生效
vi ~/.bash_profile

#将mysql的bin目录配置到环境变量中
PATH=$PATH:$HOME/bin:/usr/local/mysql/mysql-5.7.28/bin
export PATH

#使配置修改后立即生效
source ~/.bash_profile

#启动前先设置免密登录
vi /etc/my.cnf
#添加如下配置并保存 跳过权限验证
skip-grant-tables=1

#安全启动
cd /usr/local/mysql/mysql-5.7.28/bin
./mysqld_safe –user=mysql &

#修改密码
#进入mysql
mysql
use mysql
update user set authentication_string=password(“123456″) where user=”root”;
#刷新权限表
flush privileges;

#配置远程访问
use mysql
#允许所有机器访问root用户 %代表所有机器
update user set host=’%’ where user=’root’;
#授权所有机器的root用户拥有所有数据库的所有权限 远程访问密码root %代表所有机器
grant all privileges on *.* to root@’%’ identified by ‘root’;
#刷新权限表
flush privileges;

#退出mysql
exit

#安全关闭
./mysqladmin -uroot -p shutdown

#删除免密登录配置
vi /etc/my.cnf
#删除skip-grant-tables=1并保存

#安全启动
./mysqld_safe –user=mysql &

#授权IP192.168.0.102的从数据库replication用户拥有所有数据库的同步权限 远程访问密码replication
grant replication slave on *.* to ‘replication’@’192.168.0.102’ identified by ‘replication’;
#刷新权限表
flush privileges;

#授权IP192.168.0.101的从数据库replication用户拥有所有数据库的同步权限 远程访问密码replication
grant replication slave on *.* to ‘replication’@’192.168.0.101’ identified by ‘replication’;
#刷新权限表
flush privileges;

[mysqld]
basedir=/usr/local/mysql/mysql-5.7.28
datadir=/data1/mysql/data

server-id = 101

skip-external-locking

log_bin = mysql-binlog
binlog_do_db = sample
binlog-ignore-db = mysql
binlog-ignore-db = performance_schema
binlog-ignore-db = information_schema

binlog_group_commit_sync_delay = 100000 # 单位微妙
binlog_group_commit_sync_no_delay_count = 20 # 单位每组事物数量

#设置复制类型
slave-parallel-type=LOGICAL_CLOCK
#设置并行数量
slave-parallel-workers=4

#主主需要加的部分
replicate-do-db = sample

log-slave-updates=true
#sync_binlog=1
auto_increment_offset=1
auto_increment_increment=2

innodb_buffer_pool_size = 12G
innodb_buffer_pool_instances = 8
innodb_buffer_pool_chunk_size = 128M
innodb_log_file_size = 256M
innodb_log_buffer_size = 32M
innodb_flush_method = O_DIRECT
innodb_lock_wait_timeout = 120

slow_query_log = ON
slow_query_log_file = /usr/local/mysql/log/slow.log
long_query_time = 5

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

secure_file_priv=/usr/local/mysqlcsvfiles/

expire_logs_days=7
max_binlog_size=1024M

!includedir /etc/my.cnf.d

mkdir -p /usr/local/mysql/log
mkdir -p /usr/local/mysqlcsvfiles

./mysqladmin -uroot -p shutdown

./mysqld_safe –user=mysql &

#进入mysql执行
show master status\G;

#分别记录主的binlog位置，在101的角度上102为主，在102的角度上，101为主
File:mysql-bin.000001
Position: 154

#设置同步关系（两个主都要设置）
#其中master_log_file和master_log_pos要登录到对方机器执行show master status\G;去查看
stop slave;
（在192.168.0.101）
change master to master_host=’192.168.0.102′,master_user=’replication’,master_password=’replication’,master_log_file=’mysql-bin.000001′,master_log_pos=154;
（在192.168.0.102）
change master to master_host=’192.168.0.101′,master_user=’replication’,master_password=’replication’,master_log_file=’mysql-bin.000001′,master_log_pos=154;

#分别启动slave
start slave;

yum install -y gcc openssl-devel libnl libnl-devel libnfnetlink-devel

#解压keepalived压缩包放到/usr/local/并重命名为keepalived
cd /usr/local/src
tar -zxvf keepalived-2.0.7.tar.gz
mv keepalived-2.0.7 /usr/local/keepalived

#配置keepalived 得到一个Makefile的文件夹
#–prefix：keepalived安装目录
#–sysconf：keepalived的核心配置文件，必须要在/etc目录下面，改为其他位置会导致启动不了，不配置在该目录下的话，启动keepalived时日志文件里面会报错，显示找不到/etc这个文件夹
cd /usr/local/keepalived
./configure –prefix=/usr/local/keepalived/ –sysconf /etc

#编译和安装keepalived
make && make install

#创建keepalived软链接 /usr/sbin/如果存在keepalived就先删除
ln -s /usr/local/keepalived/sbin/keepalived /usr/sbin/

#复制keepalived脚本文件到/etc/init.d/目录下
cd keepalived
cp /usr/local/keepalived/etc/init.d/keepalived /etc/init.d/

#设置Keepalived开机自启动
chkconfig –add keepalived
chkconfig keepalived on

#启动keepalived
service keepalived start

vi /etc/keepalived/keepalived.conf

global_defs {
router_id LVS_LEVEL1 #主服务器名称
}

vrrp_script check_run {
script “/etc/keepalived/mysql_check.sh”
interval 5 #5秒执行一次脚本
}

vrrp_instance VI_1 {
state MASTER #主服务器
interface eth0 #承载VIP地址到物理接口
virtual_router_id 51 #虚拟路由器ID号，每个热播组保持一致
priority 100 #优先级，数值越大优先级越高
advert_int 1 #检查间隔，默认为1s
authentication { #认证信息，每个热播组保持一致
auth_type PASS #认证类型
auth_pass 1111 #密码字串
}
virtual_ipaddress {
192.168.0.144 #VIP地址（内网地址）
}
track_script {
check_run
}
}

global_defs {
router_id LVS_LEVEL2 #备份服务器名称
}
vrrp_script check_run {
script “/etc/keepalived/mysql_check.sh”
interval 5 #5秒执行一次脚本
}
vrrp_instance VI_1 {
state BACKUP #备份服务器
interface eth0 #承载VIP地址到物理接口
virtual_router_id 51 #虚拟路由器ID号，每个热播组保持一致
priority 50 #优先级，数值越大优先级越高
advert_int 1 #检查间隔，默认为1s
authentication { #认证信息，每个热播组保持一致
auth_type PASS #认证类型
auth_pass 1111 #密码字串
}
virtual_ipaddress {
192.168.0.144 #VIP地址（和主服务器设置一样）
}
track_script {
check_run
}
}

#!/bin/bash
/usr/bin/mysql -uroot -p’你自己的数据库密码’ -e “show status” &>/dev/null
if [ $? -ne 0 ] ;then
systemctl stop keepalived
fi

chmod +x /etc/keepalived/mysql_check.sh