5大主流方案对比：MySQL千亿级数据线上平滑扩容实战（上篇）

yum -y install wget
## 备份CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

wget -P /etc/yum.repos.d/ http://mirrors.aliyun.com/repo/epel-7.repo

yum clean all

yum makecache

vi /etc/yum.repos.d/mariadb-10.2.repo 

[mariadb]
name = MariaDB
baseurl = https://mirrors.ustc.edu.cn/mariadb/yum/10.2/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1

yum -y install mariadb mariadb-server MariaDB-client  MariaDB-common

[root@localhost yum.repos.d]# ps -ef | grep mysql
root       1954      1  0 Oct04 ?        00:05:43 /usr/sbin/mysqld --wsrep-new-cluster --user=root
root      89521  81403  0 07:40 pts/0    00:00:00 grep --color=auto mysql
[root@localhost yum.repos.d]# kill 1954

yum -y remove Maria*

rm -rf /var/lib/mysql/*
rm -rf /etc/my.cnf.d/
rm -rf /etc/my.cnf

systemctl start mariadb

mysql_secure_installation

mysql -uroot -p654321

use mysql;

delete from user;
## 配置root用户使用密码654321从任何主机都可以连接到mysql服务器
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '654321' WITH GRANT OPTION;

FLUSH PRIVILEGES;

[mysqld]
server-id  = 1
log-bin=mysql-bin
relay-log = mysql-relay-bin
## 忽略mysql、information_schema库下对表的操作
replicate-wild-ignore-table=mysql.%
replicate-wild-ignore-table=information_schema.%
## 默认的情况下mysql是关闭的;
log-slave-updates=on
## 复制过程中，有任何错误，直接跳过
slave-skip-errors=all
auto-increment-offset=1
auto-increment-increment=2
## binlog的格式：STATEMENT，ROW，MIXED
binlog_format=mixed
## 自动过期清理binlog，默认0天，即不自动清理
expire_logs_days=10

[mysqld]
server-id = 2
log-bin=mysql-bin
relay-log = mysql-relay-bin
replicate-wild-ignore-table=mysql.%
replicate-wild-ignore-table=information_schema.%
log-slave-updates=on
slave-skip-errors=all
auto-increment-offset=2
auto-increment-increment=2
binlog_format=mixed
expire_logs_days=10

MariaDB [(none)]> grant replication slave, replication client on *.* to 'replica'@'%' identified by 'replica';
mysql> flush privileges;

MariaDB [(none)]> show master status;
+------------------+----------+--------------+------------------+
|              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      663 |              |                  |
+------------------+----------+--------------+------------------+

MariaDB [(none)]> grant replication slave, replication client on *.* to 'replica'@'%' identified by 'replica';
mysql> flush privileges;

MariaDB [(none)]> show master status;
+------------------+----------+--------------+------------------+
|              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      663 |              |                  |
+------------------+----------+--------------+------------------+

MariaDB [(none)]> change master to master_host='192.168.116.141',master_user='replica', master_password='replica', master_port=3306, master_log_='mysql-bin.000007', master_log_pos=374, master_connect_retry=30;

MariaDB [(none)]> change master to master_host='192.168.116.140',master_user='replica', master_password='replica', master_port=3306, master_log_='mysql-bin.000015', master_log_pos=374, master_connect_retry=30;

MariaDB [(none)]> start slave;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]>  show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.10.20.126
                  Master_User: replica
                  Master_Port: 3306
                Connect_Retry: 30
              Master_Log_: mysql-bin.000001
          Read_Master_Log_Pos: 663
               Relay_Log_: mysql-relay-bin.000002
                Relay_Log_Pos: 555
        Relay_Master_Log_: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
...

MariaDB [(none)]>  show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.10.20.125
                  Master_User: replica
                  Master_Port: 3306
                Connect_Retry: 30
              Master_Log_: mysql-bin.000001
          Read_Master_Log_Pos: 663
               Relay_Log_: mysql-relay-bin.000002
                Relay_Log_Pos: 555
        Relay_Master_Log_: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
...

yum -y install keepalived

systemctl stop firewalld
systemctl disable firewalld

hostnamectl set-hostname vip1

hostnamectl set-hostname vip2

global_defs {
   router_id vip1           # 机器标识，和主机名保持一致，运行keepalived服务器的一个标识
}
vrrp_instance VI_1 {            #vrrp实例定义
    state BACKUP               #lvs的状态模式，MASTER代表主， BACKUP代表备份节点
    interface ens33               #绑定对外访问的网卡，vrrp实例绑定的网卡
    virtual_router_id 111        #虚拟路由标示，同一个vrrp实例采用唯一标示
    priority 100               #优先级，100代表最大优先级， 数字越大优先级越高
    advert_int 1              #master与backup节点同步检查的时间间隔，单位是秒
    authentication {           #设置验证信息
        auth_type PASS         #有PASS和AH两种
        auth_pass 6666         #验证密码，BACKUP密码须相同
    }
    virtual_ipaddress {         #KeepAlived虚拟的IP地址
        192.168.116.150
    }
}
virtual_server 192.168.116.150 3306 {       #配置虚拟服务器IP与访问端口
    delay_loop 6                 #健康检查时间
    lb_algo rr                  #负载均衡调度算法， rr代表轮询
    lb_kind DR                   #负载均衡转发规则 DR/NAT/
    persistence_timeout 0        #会话保持时间，这里要做测试， 所以设为0， 实际可根据session有效时间配置
    protocol TCP               #转发协议类型，支持TCP和UDP
    real_server 192.168.116.140 3306 {    #配置服务器节点VIP1    
    notify_down /usr/local/shell/mariadb.sh #当服务挂掉时， 会执行此脚本，结束keepalived进程
    weight 1               #设置权重，越大权重越高
    TCP_CHECK {              #状态监测设置
       connect_timeout 10       #超时配置， 单位秒
       retry 3             #重试次数
       delay_before_retry 3        #重试间隔
       connect_port 3306         #连接端口， 和上面保持一致
       }
    }

}

pkill keepalived

chmod a+x mariadb.sh

global_defs {
   router_id vip2           # 机器标识，和主机名保持一致，运行keepalived服务器的一个标识
}
vrrp_instance VI_1 {            #vrrp实例定义
    state BACKUP               #lvs的状态模式，MASTER代表主， BACKUP代表备份节点
    interface ens33               #绑定对外访问的网卡
    virtual_router_id 111        #虚拟路由标示，同一个vrrp实例采用唯一标示
    priority 98               #优先级，100代表最大优先级， 数字越大优先级越高
    advert_int 1              #master与backup节点同步检查的时间间隔，单位是秒
    authentication {           #设置验证信息
        auth_type PASS         #有PASS和AH两种
        auth_pass 6666         #验证密码，BACKUP密码须相同
    }
    virtual_ipaddress {         #KeepAlived虚拟的IP地址
        192.168.116.150
    }
}
virtual_server 192.168.116.150 3306 {       #配置虚拟服务器IP与访问端口
    delay_loop 6                 #健康检查时间
    lb_algo rr                  #负载均衡调度算法， rr代表轮询, 可以关闭
    lb_kind DR                   #负载均衡转发规则, 可以关闭
    persistence_timeout 0        #会话保持时间，这里要做测试， 所以设为0， 实际可根据session有效时间配置
    protocol TCP               #转发协议类型，支持TCP和UDP
    real_server 192.168.116.141 3306{    #配置服务器节点VIP2
    notify_down /usr/local/shell/mariadb.sh #当服务挂掉时， 会执行此脚本，结束keepalived进程
    weight 1               #设置权重，越大权重越高
    TCP_CHECK {              #r状态监测设置
       connect_timeout 10       #超时配置， 单位秒
       retry 3             #重试次数
       delay_before_retry 3        #重试间隔
       connect_port 3306         #连接端口， 和上面保持一致
       }
    }

}

router_id vip2   # 机器标识，和主机名保持一致
priority 98               #优先级，100代表最大优先级， 数字越大优先级越高
real_server 10.10.20.126 3306  #配置服务器节点VIP2

virtual_router_id 111        #同一个vrrp实例采用唯一标示
state BACKUP

nopreempt #不主动抢占资源

// 动态数据源配置实现扩容
Properties properties = loadProperties("datasource1.properties");
try {
    log.info("load datasource config url: " + properties.get("url"));
    DruidDataSource druidDataSource = (DruidDataSource) DruidDataSourceFactory.createDataSource(properties);
    druidDataSource.setRemoveAbandoned(true);
    druidDataSource.setRemoveAbandonedTimeout(600);
    druidDataSource.setLogAbandoned(true);
    // 设置数据源错误重连时间
    druidDataSource.setTimeBetweenConnectErrorMillis(60000);
    druidDataSource.init();
    OrchestrationShardingDataSource dataSource = SpringContextUtil.getBean("tradeSystemDataSource", OrchestrationShardingDataSource.class);
    Map<String, DataSource> dataSourceMap = dataSource.getDataSource().getDataSourceMap();
    dataSourceMap.put(DatasourceEnum.DATASOURCE_2.getValue(), druidDataSource);

    Map<String, DataSourceConfiguration> dataSourceConfigMap = new HashMap<String, DataSourceConfiguration>();
    for(String key : dataSourceMap.keySet()) {
        dataSourceConfigMap.put(key, DataSourceConfiguration.getDataSourceConfiguration(dataSourceMap.get(key)));
    }
    String result = SHARDING_RULE_TABLE_ORDER.replace(SHARDING_RULE_DATASOURCE, newRule);
    replaceActualDataNodes(result);
    SHARDING_RULE_DATASOURCE = newRule;

    dataSource.renew(new DataSourceChangedEvent(
        "/" + DruidSystemDataSourceConfiguration.DYNAMIC_SHARDING + "/config/schema/logic_db/datasource",
        dataSourceConfigMap));
    return;


} catch (Exception e) {
    log.error(e.getMessage(), e);
}