1.环境准备：
主机IP：192.168.1.4, 192.168.1.5
操作系统：centos 7.3
mysql数据库版本：mysql 5.7.13
浮动IP:192.168.1.24
mysql 采用rpm包安装 ， 依赖关系依次为common→libs→client→serveràdevel
rpm -ivhmysql-community-common-5.7.20-1.el7.x86_64.rpm
rpm -ivhmysql-community-libs-5.7.20-1.el7.x86_64.rpm
rpm -ivhmysql-community-client-5.7.20-1.el7.x86_64.rpm
rpm -ivhmysql-community-server-5.7.20-1.el7.x86_64.rpm
rpm -ivhmysql-community-devel-5.7.20-1.el7.x86_64.rpm
master 主机 ：
vim /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
character_set_server=utf8
max_connections=2000
log_timestamps=SYSTEM
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
#主主复制配置:
auto_increment_offset=1
auto_increment_increment=2
#启用二进制日志 注意：日志的目录需要先建立，并将所有者该为mysql
log-bin=mysql-bin
binlog_format=row
log_bin_trust_function_creators=1
#超过30天的binlog删除
expire_logs_days=30
server-id=31
#配置从库上的更新操作是否写入二进制文件，如果这台从库，还要做其他从库的主库，那么就需要打这个参数，以便从库的从库能够进行日志同步
log-slave-updates
sync_binlog=1
#中继日志文件
relay_log = mysql-relay-bin
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[client]
socket=/var/lib/mysql/mysql.sock
slave 主机 ：
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
character_set_server=utf8
max_connections=2000
log_timestamps=SYSTEM
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Recommended in standard MySQL setup
#sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
#主主复制配置:
auto_increment_offset=2
auto_increment_increment=2
#启用二进制日志 注意：日志的目录需要先建立，并将所有者该为mysql
log-bin=mysql-bin
binlog_format=row
log_bin_trust_function_creators=1
expire_logs_days=30
server-id=32
#配置从库上的更新操作是否写入二进制文件，如果这台从库，还要做其他从库的主库，那么就需要打这个参数，以便从库的从库能够进行日志同步
log-slave-updates
sync_binlog=1
relay_log = mysql-relay-bin
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[client]
socket=/var/lib/mysql/mysql.sock
配置主主复制
---- 在 4 上执行：
mysql> GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'replication'@'192.168.1.5' IDENTIFIED BY 'Xsjy%123';
---- 在 5 上执行：
mysql> GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'replication'@'192.168.1.4' IDENTIFIED BY 'Xsjy%123';
--查看5 mysql master 状态
mysql> show master status;
+------------------+----------+-------------------+--------------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+-------------------+--------------------------+-------------------+
| mysql-bin.000009 | 154 | ambari,hive,ranger| mysql,information_schema | |
+------------------+----------+-------------------+--------------------------+-------------------+
1 row in set (0.00 sec)
---按照5 master的状态设置 slave 4 mysql--
change master to
master_host='192.168.1.5',
master_user='replication',
master_password='Xsjy%123',
master_log_file='mysql-bin.000005',
master_log_pos=654; #对端状态显示的值
start slave;
-查看4 mysql master 状态
mysql> show master status;
+------------------+----------+-------------------+--------------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+-------------------+--------------------------+-------------------+
| mysql-bin.000008 | 1653 | ambari,hive,ranger| mysql,information_schema | |
+------------------+----------+-------------------+--------------------------+-------------------+
1 row in set (0.00 sec)
---按照4 master的状态设置 slave 5 mysql--
change master to
master_host='192.168.1.4',
master_user='replication',
master_password='Xsjy%123',
master_log_file='mysql-bin.000008',
master_log_pos=483; #对端状态显示的值
start slave;
启动mysql
#bin/mysqld_safe --user=mysql & 或者service mysqld start
#bin/mysql --user=root –p
--输入 /var/log/mysqld.log 中生成的临时密码
重新设置密码：
mysql>set global validate_password_policy=0;
mysql>set global validate_password_length=1;
mysql> set password=password('123456');
允许远程登录：
mysql>grant all privileges on *.* to root@'%' identified by '123456';
mysql> flush privileges;
查看用户信息
mysql> use mysql;
mysql> select host,user from user where user='root';
+-----------+------+
| host | user |
+-----------+------+
| % | root |
| localhost | root |
+-----------+------+
2 rows in set (0.00 sec)
keepalived配置 ：
#yum install keepalived -y
keepalived的日志默认是输出到/var/log/messages中，这样不便于查看。
如何自定义keepalived的日志输出文件呢？
# vim /etc/sysconfig/keepalived
KEEPALIVED_OPTIONS="-D -d -S 0"
# vim /etc/rsyslog.conf在文件最后添加：
#keepalived -S 0
local0.* /var/log/keepalived.log
重新启动日志
# systemctl restart rsyslog
最后使用以下命令进行验证
# systemctl restart keepalived
# tail -f /var/log/keepalived.log
主节点： vim /etc/keepalived/keepalived.conf
vrrp_script check_mysql {
script "/usr/sbin/check_mysql.sh"
interval 2
weight 2
}
vrrp_instance MYSQL_HA {
#state MASTER
state BACKUP
interface eth0
virtual_router_id 50
priority 100
nopreempt
advert_int 1
authentication {
auth_type PASS
auth_pass password123
}
track_script {
check_mysql
}
virtual_ipaddress {
192.168.1.24/24 dev eth0
}
}
keepalive从节点配置：
vrrp_script check_mysql {
script "/usr/sbin/check_mysql.sh"
interval 2
weight 2
}
vrrp_instance MYSQL_HA {
#state MASTER
state BACKUP
interface eth0
virtual_router_id 50
priority 90
#nopreempt
advert_int 1
authentication {
auth_type PASS
auth_pass password123
}
track_script {
check_mysql
}
virtual_ipaddress {
192.168.1.24/24 dev eth0
}
}
vim /usr/sbin/check_mysql.sh
#!/bin/sh
nc localhost 3306 -w 1 < /dev/null &>/dev/null || systemctl stop keepalived
vim /usr/sbin/check_keepalived.sh
#!/bin/bash
DATE=`date +"%Y-%m-%d %H:%M:%S"`
Process_count=`ps -C keepalived --noheader|wc -l`
if [ $Process_count -eq 3 ]
then
echo "$DATE keepalived service is running" >> /tmp/check_ka.log
else
echo "$DATE keepalived service is not running" >> /tmp/check_ka.log
systemctl start keepalived >> /tmp/check_ka.log
fi
该脚本用来检测keepalived 服务。可以写到 crontab 里面调用没分钟检查一次。
*/1 * * * * /etc/keepalived/check_keepalived.sh