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Keepalived+LVS+MySQL双主复制实现读写负载均衡

Keepalived+LVS+MySQL双主复制实现读写负载均衡

作者: 文知道 | 来源:发表于2020-07-22 19:24 被阅读0次

    一、简介

    1. Keepalived

    • Keepalived 是一个基于 VRRP （虚拟路由冗余协议）可用来实现服务高可用性的软件方案，避免出现单点故障。Keepalived一般用来实现轻量级高可用性，且不需要共享存储，一般用于两个节点之间，常见有LVS+Keepalived、Nginx+Keepalived组合。

    2. LVS

    • LVS (Linux Virtual Server)是一个高可用性虚拟的服务器集群系统。本项目在1998年5月由章文嵩博士成立，是中国国内最早出现的自由软件项目之一。
      LVS主要用于多服务器的负载均衡，作用于网络层。LVS构建的服务器集群系统中，前端的负载均衡层被称为Director Server；后端提供服务的服务器组层被称为Real Server。通过下图可以大致了解LVS的基础架构。
    • 本文中将利用LVS实现MySQL的读写负载均衡，Keepalived避免节点出现单点故障。

    3. MySQL双主复制

    二、安装配置

    • 192.168.245.66：Keepalived + LVS Master
      192.168.245.88：Keepalived + LVS Slave
      192.168.245.22：MySQL Replication Master
      192.168.245.33：MySQL Replication Master
      192.168.245.100：VIP（虚拟IP）
      192.168.245.11：Web服务器（测试用）

    三、服务器192.168.245.66配置Keepalived + LVS Master

    1. 安装LVS

    yum -y install ipvsadm

    2. 下载安装Keepalived

    yum install -y gcc
yum install -y kernel-devel openssl openssl-devel

    wget -q http://www.keepalived.org/software/keepalived-1.2.13.tar.gz
tar -zxvf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./configure && make && make install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/
chkconfig --add keepalived
chkconfig --level 345 keepalived on

    3. Keepalived配置文件修改

    vim /etc/keepalived/keepalived.conf
    • 修改内容如下
    ! Configuration File for keepalived

global_defs {
   router_id LVS1
}

vrrp_instance VI_1 {
    state MASTER #指定instance初始状态，实际根据优先级决定.backup节点不一样
    interface ens33 #虚拟IP所在网卡通过 ifconfig可以查看
    virtual_router_id 51 #VRID，相同VRID为一个组，决定多播MAC地址
    priority 100 #优先级，另一台改为90.backup节点不一样
    advert_int 1  #检查间隔
    authentication {
        auth_type PASS  #认证方式，可以是pass或ha
        auth_pass 1111  #认证密码
    }
    virtual_ipaddress {
        192.168.245.100  #VIP
    }
}

virtual_server 192.168.245.100 3306 {
    delay_loop 6  #服务轮询的时间间隔
    lb_algo wrr  #加权轮询调度，LVS调度算法 rr|wrr|lc|wlc|lblc|sh|sh
    lb_kind DR   #LVS集群模式 NAT|DR|TUN，其中DR模式要求负载均衡器网卡必须有一块与物理网卡在同一个网段
    #nat_mask 255.255.255.0
    persistence_timeout 50  #会话保持时间
    protocol TCP  #健康检查协议

     ## Real Server设置，3306就是MySQL连接端口
    real_server 192.168.245.22 3306 {
        weight 3  ##权重
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
    real_server 192.168.245.33 3306 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
}

    4. 启动Keepalived

    systemctl start keeplived

    5. 查看虚拟网卡添加是否成功

    ip a
    • 如图会出现虚拟网卡

    四、服务器192.168.245.88配置Keepalived + LVS Slave

    1. 安装LVS

    yum -y install ipvsadm

    2. 下载安装Keepalived

    yum install -y gcc
yum install -y kernel-devel openssl openssl-devel

    wget -q http://www.keepalived.org/software/keepalived-1.2.13.tar.gz
tar -zxvf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./configure && make && make install
cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived
cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/sbin/keepalived /usr/sbin/
chkconfig --add keepalived
chkconfig --level 345 keepalived on

    3. Keepalived配置文件修改

    vim /etc/keepalived/keepalived.conf
    • 修改内容如下
    ! Configuration File for keepalived

global_defs {
   router_id LVS1
}

vrrp_instance VI_1 {
    state BACKUP #指定instance初始状态，实际根据优先级决定.backup节点不一样
    interface ens33 #虚拟IP所在网卡通过 ifconfig可以查看
    virtual_router_id 51 #VRID，相同VRID为一个组，决定多播MAC地址
    priority 90 #优先级，另一台改为90.backup节点不一样
    advert_int 1  #检查间隔
    authentication {
        auth_type PASS  #认证方式，可以是pass或ha
        auth_pass 1111  #认证密码
    }
    virtual_ipaddress {
        192.168.245.100  #VIP
    }
}

virtual_server 192.168.245.100 3306 {
    delay_loop 6  #服务轮询的时间间隔
    lb_algo wrr  #加权轮询调度，LVS调度算法 rr|wrr|lc|wlc|lblc|sh|sh
    lb_kind DR   #LVS集群模式 NAT|DR|TUN，其中DR模式要求负载均衡器网卡必须有一块与物理网卡在同一个网段
    #nat_mask 255.255.255.0
    persistence_timeout 50  #会话保持时间
    protocol TCP  #健康检查协议

     ## Real Server设置，3306就是MySQL连接端口
    real_server 192.168.245.22 3306 {
        weight 3  ##权重
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
    real_server 192.168.245.33 3306 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 3306
        }
    }
}

    4. 启动Keepalived

    systemctl start keeplived

    5. 查看虚拟网卡添加是否成功

    ip a
    • 由于Master上已经有虚拟网卡了，Slave上是不显示的，只有当Master出现故障时Slave才会有

    五、在数据服务器编写RealServer的网络配置脚本

    • 两个数据服务器192.168.245.22和192.168.245.33进行同样操作。

    1.添加RealServer脚本

    vim /etc/init.d/realserver

    #!/bin/sh
VIP=192.168.245.100
. /etc/rc.d/init.d/functions

case "$1" in
# 禁用本地的ARP请求、绑定本地回环地址
start)
    /sbin/ifconfig lo down
    /sbin/ifconfig lo up
    echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
    echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
    echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
    echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
    /sbin/sysctl -p >/dev/null 2>&1
    /sbin/ifconfig lo:0 $VIP netmask 255.255.255.255 up # 在回环地址上绑定VIP，设定掩码，与Direct Server上自身的IP保持通信
    /sbin/route add -host $VIP dev lo:0
    echo "LVS-DR real server starts successfully.\n"
    ;;
stop)
    /sbin/ifconfig lo:0 down
    /sbin/route del $VIP >/dev/null 2>&1
    echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
    echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
    echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
    echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "LVS-DR real server stopped.\n"
    ;;
status)
    isLoOn=`/sbin/ifconfig lo:0 | grep "$VIP"`
    isRoOn=`/bin/netstat -rn | grep "$VIP"`
    if [ "$isLoON" == "" -a "$isRoOn" == "" ]; then
        echo "LVS-DR real server has run yet."
    else
        echo "LVS-DR real server is running."
    fi
    exit 3
    ;;
*)
    echo "Usage: $0 {start|stop|status}"
    exit 1
esac
exit 0

    2. 修改脚本权限并启动realserver

    chmod +x /etc/init.d/realserver
echo "/etc/init.d/realserver" >> /etc/rc.d/rc.local
service realserver start

    3. 查看虚拟网卡

    ip a
    • 出现虚拟网卡

    六、查看LVS集群状态

    ipvsadm -Ln

    IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.245.100:3306 wrr persistent 50
  -> 192.168.245.22:3306          Route   1      0          0         
  -> 192.168.245.33:3306          Route   1      0          0

    七、测试

    在WEB服务器（192.168.245.11）上，添加测试文件mysql.php

    <?php
/**
 * Created by PhpStorm.
 * User: wen
 * Date: 7/22/2020
 * Time: 5:00 PM
 */

$servername = "192.168.245.100";
$username = "root";
$password = "123123";
$dbname = "test";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}{
    echo "连接成功";
}

$sql = "INSERT INTO activity (admin_id, user_id, name)
VALUES ('1', '122', 'keepalived1')";

if ($conn->query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

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