• 4、Mycat高可用


    基于HA机制的Mycat高可用

      在实际项目中,Mycat 服务也需要考虑高可用性,如果 Mycat 所在服务器出现宕机,或 Mycat 服务故障,需要有备机提供服务,需要考虑 Mycat 集群。

    1.高可用方案

      使用 HAProxy + Keepalived 配合两台 Mycat 搭起 Mycat 集群,实现高可用性。HAProxy 实现了 MyCat 多节点的集群高可用和负载均衡,而 HAProxy 自身的高可用则可以通过 Keepalived 来实现。

      

    编号

    角色

    IP地址

    机器名

    1

    Mycat1

    192.168.188.188

    host79.pluto

    2

    Mycat2

    192.168.188.189

    host80.pluto

    3

    HAProxy(master)

    192.168.188.190

    host81.pluto

    4

    Keepalived(master)

    192.168.188.190

    host81.pluto

    5

    HAProxy(backup)

    192.168.188.191

    host82.pluto

    6

    Keepalived(backup)

    192.168.188.191

    host82.pluto

    2.安装配置HAProxy

    #1、准备好HAProxy安装包,传到/opt目录下

     

    #2、解压到/usr/local/src

    tar -zxvf haproxy-1.5.18.tar.gz -C /usr/local/src

     

    #3、进入解压后的目录,查看内核版本,进行编译

    cd /usr/local/src/haproxy-1.5.18

    uname -r

    make TARGET=linux310 PREFIX=/usr/local/haproxy ARCH=x86_64

    # ARGET=linux310,内核版本,使用uname -r查看内核,如:3.10.0-514.el7,此时该参数就为linux310#ARCH=x86_64,系统位数;

    #PREFIX=/usr/local/haprpxy #/usr/local/haprpxy,为haprpxy安装路径。

     

    #4、编译完成后,进行安装

    make install PREFIX=/usr/local/haproxy

     

    #5、安装完成后,创建目录、创建HAProxy配置文件

    mkdir -p /usr/data/haproxy/

    vim /usr/local/haproxy/haproxy.conf

     

    #6向配置文件中插入以下配置信息,并保存

    [1].安装HAProxy

    (1).准备好HAProxy安装包,传到/opt目录下

    http://www.haproxy.org/download/1.5/src/

    [root@host81 /]# cp /mnt/hgfs/VMShare/haproxy-1.5.18.tar.gz /opt/

    (2).解压到/usr/local/src

    [root@host81 opt]# tar -zxvf haproxy-1.5.18.tar.gz -C /usr/local/src/

    (3).进入解压的目录,查看内核版本,进行编译

    [root@host81 ~]# cd /usr/local/src/haproxy-1.5.18/

    [root@host81 haproxy-1.5.18]# uname -r

    2.6.32-642.el6.x86_64

    [root@host81 haproxy-1.5.18]# make TARGET=linux26 PREFIX=/usr/local/haproxy ARCH=x86_64

    # ARGET=linux26,内核版本,使用uname -r查看内核,如:2.6.32-642.el6.x86_64

    ,此时该参数就为linux26#ARCH=x86_64,系统位数;

    #PREFIX=/usr/local/haprpxy #/usr/local/haprpxy,为haprpxy安装路径。

    (4).编译完成后,进行安装

    [root@host81 haproxy-1.5.18]# make install PREFIX=/usr/local/haproxy

    (5).安装完成后,创建目录、创建HAProxy配置文件

    [root@host81 haproxy-1.5.18]# mkdir -p /usr/data/haproxy/

    [root@host81 haproxy-1.5.18]# vim /usr/local/haproxy/haproxy.conf

    global

      log 127.0.0.1 local0

      #log 127.0.0.1 local1 notice

      #log loghost local0 info

      maxconn 4096

      chroot /usr/local/haproxy

      pidfile /usr/data/haproxy/haproxy.pid

      uid 99

      gid 99

      daemon

      #debug

      #quiet

     

    defaults

      log global

      modetcp

      option abortonclose

      option redispatch

      retries 3

      maxconn 2000

      timeout connect 5000

      timeout client 50000

      timeout server 50000

     

    listen proxy_status 

      bind :48066

      mode tcp

      balance roundrobin

      server mycat_1 192.168.140.188:8066 check inter 10s

      server mycat_2 192.168.140.189:8066 check inter 10s

     

    frontend admin_stats 

      bind :7777

      mode http

      stats enable

      option httplog

      maxconn 10

      stats refresh 30s

      stats uri /admin

      stats auth admin:123456

      stats hide-version

      stats admin if TRUE

    [2].启动验证

    (1).启动HAProxy

    [root@host82 haproxy]# /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.conf

    (2).查看HAProxy进程

    [root@host82 haproxy]# ps -ef | grep haproxy

    nobody    18545      1  0 15:13 ?        00:00:00 /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.conf

    root      18547  16893  0 15:13 pts/0    00:00:00 grep haproxy

    (3).打开浏览器访问

    http://192.168.188.191:7777/admin

    #在弹出框输入用户名:admin密码:123456

    #如果Mycat主备机未启动,则可以看到如下图

     

    (4).验证负载均衡

    3.安装配置Keepalived

    [1].安装Keepalived

    (1).准备好Keepalived安装包,传到/opt目录下

    https://www.keepalived.org/download.html

    (2).解压到/usr/local/src

    tar -zxvf keepalived-1.4.2.tar.gz -C /usr/local/src

    (3).安装依赖插件

    yum install -y gcc openssl-devel popt-deve

    (4).进入解压后的目录,进行配置,进行编译安装

    cd /usr/local/src/keepalived-1.4.2

    ./configure --prefix=/usr/local/keepalived

    make && make install

    (5).运行前配置

    cp /usr/local/src/keepalived-1.4.2/keepalived/etc/init.d/keepalived /etc/init.d/

    mkdir /etc/keepalived

    cp /usr/local/keepalive/etc/keepalived/keepalived.conf /etc/keepalived/

    cp /usr/local/src/keepalived-1.4.2/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

    cp /usr/local/keepalive/sbin/keepalived /usr/sbin/

    (6).配置文件修改

    vim /etc/keepalived/keepalived.conf

     

    #修改内容如下

    ! Configuration File for keepalived

    global_defs {

      notification_email {

        xlcocoon@foxmail.com

      }

      notification_email_from keepalived@showjoy.com

      smtp_server 127.0.0.1

      smtp_connect_timeout 30

      router_id LVS_DEVEL

      vrrp_skip_check_adv_addr

      vrrp_garp_interval 0

      vrrp_gna_interval 0

    }

    vrrp_instance VI_1 {

      #主机配MASTER,备机配BACKUP

      state MASTER

      #所在机器网卡

      interface eth1

      virtual_router_id 51

      #数值越大优先级越高

      priority 100

      advert_int 1

      authentication {

        auth_type PASS

        auth_pass 1111

      }

      virtual_ipaddress {

        #虚拟IP

        192.168.188.200

      } 

    }

    virtual_server 192.168.188.200 48066 {

      elay_loop 6

      lb_algo rr

      lb_kind NAT

      persistence_timeout 50

      protocol TCP

      real_server 192.168.188.190 48066 {

        weight 1

        TCP_CHECK {

          connect_timeout 3

          retry 3

          delay_before_retry 3

        } 

      }

      real_server 192.168.188.191 48600 {

        weight 1

        TCP_CHECK {

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

      } 

    }

     

    [2].启动验证

    #1启动Keepalived

    service keepalived start

     

    #2登录验证

    mysql -umycat -p123456 -h 192.168.140.200 -P 48066

    4.测试高可用

    #1关闭mycat

    #2通过虚拟ip查询数据

    mysql -umycat -p123456 -h 192.168.140.200 -P 48066

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  • 原文地址:https://www.cnblogs.com/HOsystem/p/14118009.html
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