利用keepalived和haproxy配置mysql的高可用负载均衡

来源:互联网 发布:梦想的数据 编辑:程序博客网 时间:2024/06/05 07:49

转载http://www.cnblogs.com/tae44/p/4717334.html

实验系统:CentOS 6.6_x86_64(2.6.32-504.30.3.el6.x86_64)

实验前提:防火墙和selinux都关闭

实验说明:本实验共有4台主机,IP分配如拓扑

实验软件:keepalived-1.2.19  haproxy-1.5.14  mariadb-10.0.20

下载地址:http://pan.baidu.com/s/1bnnYiMr

实验拓扑:

    

一、安装mariadb

  1.在两台数据库服务器安装:

复制代码
tar xf mariadb-10.0.20-linux-x86_64.tar.gz  -C /usr/local/cd /usr/local/ln -sv mariadb-10.0.20-linux-x86_64 mysqluseradd -r mysqlmkdir -pv /mydata/datachown -R mysql.mysql /mydata/data/cd mysql/chown -R root.mysql .scripts/mysql_install_db --user=mysql --datadir=/mydata/data/cp support-files/my-large.cnf /etc/my.cnfcp support-files/mysql.server /etc/init.d/mysqldchkconfig --add mysqldchkconfig mysqld on
复制代码

  2.配置主主复制:

    19.74:

vim /etc/my.cnf 
----------------------------------------------->
[mysqld]
server-id = 1
datadir = /mydata/data
log-bin = /mydata/data/mysql1-bin
binlog_format = ROW
relay_log = /mydata/data/relay-log
auto-increment-increment = 2
auto-increment-offset = 1
sync_binlog = 1
sync_master_info = 1
sync_relay_log = 1
sync_relay_log_info = 1
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19.76:

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vim /etc/my.cnf 
----------------------------------------------->
[mysqld]
server-id = 2
datadir = /mydata/data
log-bin = /mydata/data/mysql2-bin
binlog_format = ROW
relay_log = /mydata/data/relay-log
auto-increment-increment = 2
auto-increment-offset = 2
sync_binlog = 1
sync_master_info = 1
sync_relay_log = 1
sync_relay_log_info = 1
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  3.创建具有复制权限的用户:

19.74:

service mysqld start/usr/local/mysql/bin/mysql------------------------------------------>GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO 'master'@'192.168.19.76' IDENTIFIED BY '123456';FLUSH PRIVILEGES;

19.76:

service mysqld start/usr/local/mysql/bin/mysql------------------------------------------>GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO 'master'@'192.168.19.74' IDENTIFIED BY '123456';FLUSH PRIVILEGES;

  4.查看二进制位置:

19.74:

SHOW MASTER LOGS;

    

    19.76上使用相同命令:

    

  5.配置双主:

19.74:

CHANGE MASTER TO MASTER_HOST='192.168.19.76',MASTER_USER='master',MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql2-bin.000001',MASTER_LOG_POS=1112;START SLAVE;

19.76:

CHANGE MASTER TO MASTER_HOST='192.168.19.74',MASTER_USER='master',MASTER_PASSWORD='123456',MASTER_LOG_FILE='mysql1-bin.000001',MASTER_LOG_POS=1112;START SLAVE;

二、编译安装haproxy

  1.在19.66和19.79上编译安装haproxy:

tar xf haproxy-1.5.14.tar.gz cd haproxy-1.5.14
yum install -y gccmake TARGET=linux2628 ARCH=x86_64        //根据自己主机设定make install SBINDIR=/usr/sbin/ MANDIR=/usr/share/man/ DOCDIR=/usr/share/doc/

  2.提供启动脚本:

按 Ctrl+C 复制代码
vim /etc/init.d/haproxy
--------------------------------------------------->
#!/bin/sh
#
# haproxy
#
# chkconfig:   - 85 15
# description:  HAProxy is a free, very fast and reliable solution \
#               offering high availability, load balancing, and \
#               proxying for TCP and  HTTP-based applications
# processname: haproxy
# config:      /etc/haproxy/haproxy.cfg
# pidfile:     /var/run/haproxy.pid


# Source function library.
. /etc/rc.d/init.d/functions


# Source networking configuration.
. /etc/sysconfig/network


# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0


exec="/usr/sbin/haproxy"
prog=$(basename $exec)


[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog


cfgfile=/etc/haproxy/haproxy.cfg
pidfile=/var/run/haproxy.pid
lockfile=/var/lock/subsys/haproxy


check() {
    $exec -c -V -f $cfgfile $OPTIONS
}


start() {
    $exec -c -q -f $cfgfile $OPTIONS
    if [ $? -ne 0 ]; then
        echo "Errors in configuration file, check with $prog check."
        return 1
    fi


    echo -n $"Starting $prog: "
    # start it up here, usually something like "daemon $exec"
    daemon $exec -D -f $cfgfile -p $pidfile $OPTIONS
    retval=$?
    echo
    [ $retval -eq 0 ] && touch $lockfile
    return $retval
}


stop() {
    echo -n $"Stopping $prog: "
    # stop it here, often "killproc $prog"
    killproc $prog
    retval=$?
    echo
    [ $retval -eq 0 ] && rm -f $lockfile
    return $retval
}


restart() {
    $exec -c -q -f $cfgfile $OPTIONS
    if [ $? -ne 0 ]; then
        echo "Errors in configuration file, check with $prog check."
        return 1
    fi
    stop
    start
}


reload() {
    $exec -c -q -f $cfgfile $OPTIONS
    if [ $? -ne 0 ]; then
        echo "Errors in configuration file, check with $prog check."
        return 1
    fi
    echo -n $"Reloading $prog: "
    $exec -D -f $cfgfile -p $pidfile $OPTIONS -sf $(cat $pidfile)
    retval=$?
    echo
    return $retval
}


force_reload() {
    restart
}


fdr_status() {
    status $prog
}


case "$1" in
    start|stop|restart|reload)
        $1
        ;;
    force-reload)
        force_reload
        ;;
    check)
        check
        ;;
    status)
        fdr_status
        ;;
    condrestart|try-restart)
        [ ! -f $lockfile ] || restart
        ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|try-restart|reload|force-reload}"
        exit 2
esac
<---------------------------------------------------
chkconfig --add haproxy
chkconfig haproxy on
chmod +x /etc/init.d/haproxy
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  3.提供配置文件:

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mkdir /etc/haproxy
mkdir /var/lib/haproxy
useradd -r haproxy
vim /etc/haproxy/haproxy.cfg
----------------------------------------------------------------------->
global


    log         127.0.0.1 local2


    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon


    stats socket /var/lib/haproxy/stats


defaults
    mode                    tcp            //haproxy运行模式
    log                     global
    option                  dontlognull
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 600           //最大连接数


listen stats                              //配置haproxy状态页
    mode http
    bind :6677                            //找一个比较特殊的端口
    stats enable
    stats hide-version                    //隐藏haproxy版本号
    stats uri     /haproxyadmin?stats     //一会用于打开状态页的uri
    stats realm   Haproxy\ Statistics     //输入账户密码时的提示文字
    stats auth    admin:admin             //用户名:密码
    stats admin if TRUE                   //开启状态页的管理功能


frontend  main *:3306                     //这里为了实验方便,使用3306端口
    default_backend             mysql     //后端服务器组名


backend mysql
    balance     leastconn                 //使用最少连接方式调度
    server m1 192.168.19.74:3306 check port 3306 maxconn 300
    server m2 192.168.19.76:3306 check port 3306 maxconn 300
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   4.启动日志:

复制代码
vim /etc/rsyslog.conf -----------------------------------------------------># Provides UDP syslog reception                //去掉下面两行注释,开启UDP监听$ModLoad imudp$UDPServerRun 514local2.*             /var/log/haproxy.log      //添加此行
<-----------------------------------------------------
service rsyslog restart
复制代码

   5.启动测试haproxy:

service haproxy start
netstat -tnlp

 

  6.在19.74上创建远程登录账号:

GRANT ALL ON *.* TO 'jason'@'192.168.19.%' IDENTIFIED BY '123456';FLUSH PRIVILEGES;

  7.分别在19.66和19.79上登录mysql,若都能连接成功则继续往下:

yum -y install mysql                            //如果没有mysql客户端则运行此命令
mysql -ujason -p123456 -h192.168.19.66 //在19.66上登录
mysql -ujason -p123456 -h192.168.19.79 //在19.79上登录

三、安装keepalived

  1.在19.66和19.79上编译安装keepalived:

复制代码
tar xf keepalived-1.2.19.tar.gz cd keepalived-1.2.19
yum -y install openssl-devel./configure --prefix=/usr/local/keepalived --sbindir=/usr/sbin/ --sysconfdir=/etc/ --mandir=/usr/local/share/man/ --with-kernel-dir=/usr/src/kernels/2.6.32-504.30.3.el6.x86_64/      //内核版本换成自己主机的 uname -a 查看内核  make && make installchkconfig --add keepalivedchkconfig keepalived on
复制代码

   2.在19.66上配置:

按 Ctrl+C 复制代码
vim /etc/keepalived/keepalived.conf
----------------------------------------------------->
! Configuration File for keepalived


global_defs {                                             //此段暂时略过,下同
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}


vrrp_script chk_haproxy {
    script "/etc/keepalived/chk.sh"                      //检查haproxy的脚本
    interval 2                                           //每两秒检查一次
}


vrrp_instance VI_1 {
    state BACKUP                                        //定义为BACKUP节点
    nopreempt                                           //开启不抢占
    interface eth0
    virtual_router_id 51
    priority 100                                        //开启了不抢占,所以此处优先级必须高于另一台
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass abcd
    }
    virtual_ipaddress {
        192.168.19.150                                 //配置VIP
    }
    track_script {
        chk_haproxy                                    //调用检查脚本
    }


    notify_backup "/etc/init.d/haproxy restart"
    notify_fault "/etc/init.d/haproxy stop"
}
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  3.在19.79上配置:

复制代码
vim /etc/keepalived/keepalived.conf----------------------------------------------------->! Configuration File for keepalivedglobal_defs {   notification_email {     acassen@firewall.loc     failover@firewall.loc     sysadmin@firewall.loc   }   notification_email_from Alexandre.Cassen@firewall.loc   smtp_server 192.168.200.1   smtp_connect_timeout 30   router_id LVS_DEVEL}vrrp_script chk_haproxy {    script "/etc/keepalived/chk.sh"    interval 2}vrrp_instance VI_1 {    state BACKUP    interface eth0    virtual_router_id 51    priority 99    advert_int 1    authentication {        auth_type PASS        auth_pass abcd    }    virtual_ipaddress {        192.168.19.150    }    track_script {        chk_haproxy    }    notify_backup "/etc/init.d/haproxy restart"    notify_fault "/etc/init.d/haproxy stop"}

  4.在两台机器上创建chk.sh文件:

按 Ctrl+C 复制代码
vim /etc/keepalived/chk.sh
------------------------------------------------>
#!/bin/bash
#
if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then
       /etc/init.d/keepalived stop
fi
<------------------------------------------------
chmod +x /etc/keepalived/chk.sh
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  5.在19.66和19.79上进行测试:

service keepalived start

    此处两台主机均配置为BACKUP,因此哪台先运行keepalived,VIP就在哪台上。我这里刚开始VIP运行在19.66上,然后进行连接测试:

    

mysql -ujason -p123456 -h192.168.19.150
------------------------------------------->
CREATE DATABASE bokeyuan;

    后端数据库服务器抓包:

    

    停掉19.66的keepalived服务,让VIP转移到19.79上,再进行测试:

service keepalived stop                   //停掉19.66的keepalived服务
mysql -ujason -p123456 -h192.168.19.150
------------------------------------------->
SHOW DATABASES;

    后端数据库服务器抓包: yum install -y tcpdump

tcpdump -n -i eth0src 192.168.19.74

网上搜的抓包方法 不知道笔者怎么抓的(经过测试我没抓到


    

  6.在浏览器打开http://192.168.19.150:6677/haproxyadmin?stats,打开haproxy状态页:admin/admin

ps:外部客户的连接mysql   用vip  192.168.19.150

    在19.74上关闭mysql服务,可以看到haproxy对于后端服务器的检测是很迅速的:

service mysqld stop

  7.额外说明:

    继续之前的实验,将19.66上的keepalived服务再次启动,可以发现,VIP仍然在19.79上,这就是之前为什么要配置不抢占的原因。如果按照正常的配置,将19.66配置为MASTER,当它重启keepalived服务后,则一定会将VIP抢回。但实际上我们并不希望这样,因为19.79仍在正常工作,19.66没有理由去抢夺资源,造成没必要的资源切换。实验演示就到这里,谢谢大家!

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