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Nginx+keepalived主从双机热备自动切换解决方案

时间：2023-08-10 22:31:51浏览次数：36  
标签：热备 conf -- keepalived 192.168 nginx ff 双机

Nginx+keepalived主从双机热备自动切换解决方案



测试环境如下：


系统：Ceentos 6.4 64位


主nginx服务器：192.168.122.5


备nginx服务器：192.168.122.6


VIP：192.168.122.15


一、Nginx+keepalived 安装—脚本安装



#!/bin/bash
# author: kuangl
# mail: [email protected]
# description: The installation of Nginx files.
# -------------------------------------------------------- #
## Nginx_install
# -------------------------------------------------------- #
# Nginx installation
#CURRENT_PATH=$(pwd)
for  i  in  $(rpm -q gcc gcc-c++ kernel-devel openssl-devel zlib-devel popt-devel popt-static libnl-devel wget  make  | grep  'not installed'  |  awk  '{print $2}' )
do
yum -y  install  $i
done
[ -d  /root/software  ]
[  "$?"  != 0 ] &&  mkdir  /root/software
cd  /root/software
[ !-e pcre-8.33. tar .gz ] && wget  ftp : //ftp .csx.cam.ac.uk /pub/software/programming/pcre/pcre-8 .33. tar .gz
tar  -zxvf pcre-8.33. tar .gz
cd  pcre-8.33
. /configure
make  &&  make  install
echo  $? || [ $? != 0] ||  echo " installation pcrefailed"  ||  exit  1
cd  /root/software
[ ! -e nginx-1.2.9. tar .gz ] && wget http: //nginx .org /download/nginx-1 .2.9. tar .gz
tar  -zxvf nginx-1.2.9. tar .gz
cd  nginx-1.2.9
. /configure--prefix = /usr/local/nginx  --with-http_ssl_module --with-http_sub_module --with-http_stub_status_module--with-http_gzip_static_module
make  &&  make  install
echo  $? || [ $? != 0] ||  echo " installationnginxfailed"  ||  exit  1
# -------------------------------------------------------- #
## Keepalived_intsall
# -------------------------------------------------------- #
# Keepalived installation
cd  /root/softwarae
[ ! -e keepalived-1.2.4. tar .gz ] &&wget http: //www .keepalived.org /software/keepalived-1 .2.4. tar .gz
tar  -zxvf keepalived-1.2.4. tar .gz
cd  keepalived-1.2.4
ln  -s  /usr/src/kernels/ $( uname  -r)  /usr/src/kernels/linux
. /configure  --prefix= /usr--bindir = /usr/bin--sbindir = /usr/bin--libexecdir = /usr/libexec  --localstatedir= /var  --libdir= /lib64--infodir = /usr/share/info--sysconfdir = /etc  --mandir= /usr/local/share/man--with-kernel-dir = /usr/src/kernels/linux
make  &&  make  install
echo  $? || [ $? != 0] || print  " installation keepalivedfailed"  ||  exit  1
chkconfig --add keepalived
chkconfig --level 345 keepalived on


二、主Nginx 配置


[root@node5 conf] # mkdir -p /var/www/html
[root@node5 conf] # cat "192.168.122.5" > /var/www/html/index.html
[root@node5 conf] # vim nginx.conf




[root@node5 conf] # ../sbin/nginx -s reload
[root@node5 conf] # curl http://192.168.122.5
192.168.122.5



三、主Keepalived配置


[root@node6 conf] # vim /etc/keepalived/keepalived.conf
! Configuration File  for  keepalived
global_defs {
notification_email {
[email protected]
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script  "/etc/keepalived/chk_nginx.keepalived.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 200
advert_int 1
authentication {
auth_type PASS
auth_pass kuangling
}
track_script {
chk_nginx.keepalived
}
virtual_ipaddress {
192.168.122.15
}
}



四、备nginx配置

t@node6 conf] # mkdir -p /var/www/html
[root@node6 conf] # cat "192.168.122.6" > /var/www/html/index.html
[root@node6 conf] # vim nginx.conf


[root@node6 conf] # ../sbin/nginx -s reload
[root@node6 conf] # curl http://192.168.122.6
192.168.122.6

五、备keepalived配置


[root@node6 conf] # vim /etc/keepalived/keepalived.conf
! Configuration File  for  keepalived
global_defs {
notification_email {
[email protected]
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_nginx {
script  "/etc/keepalived/chk_nginx.keepalived.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass kuangling
}
track_script {
chk_nginx.keepalived
}
virtual_ipaddress {
192.168.122.15
}
}


六、分别在2台nginx服务器上添加检测脚本：


[root@node6 conf] # vim /etc/keepalived/chk_nginx.keepalived.sh
#!/bin/bash
# description:
# 定时查看Nginx是否存在，如果不存在则启动Nginx
# 如果启动失败，则停止keepalived
status=` ps  -C nginx --no-header | wc  -l`
if  [ $status - eq  0 ]; then
/usr/local/nginx/sbin/nginx
sleep  3
if  [ ` ps  -C nginx --no-header | wc  -l` - eq  0 ]; then
killall keepalived
fi
fi
[root@node6 conf] #chmod +x /etc/keepalived/chk_nginx.keepalived.sh

七、测试

分别在2台nginx上启动nginx和keepalived服务，然后分别用ip a 查看ip







nginx+keepalived实现双机热备的高可用

64人收藏此文章, 我要收藏发表于15天前(2013-09-12 23:11) , 已有 664次阅读 ，共 1个评论

目录：[ - ]


keepalived安装

keepalived的配置

keepalived的测试

这篇文章简单介绍利用keepalived软件，实现对nginx服务器的高可用，即实现故障自动切换。假设你已经安装好nginx，下面介绍keepalived的安装和使用。


keepalived安装

yum install openssl-devel

cd /tmp

wget http://www.keepalived.org/software/keepalived-1.2.2.tar.gz

tar xzf keepalived-1.2.2.tar.gz

cd keepalived-1.2.2

./configure

make && make install

cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/

cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

chmod +x /etc/init.d/keepalived

chkconfig --add keepalived

chkconfig keepalived on

mkdir /etc/keepalived

ln -s /usr/local/sbin/keepalived /usr/sbin/

keepalived的配置

更详细的keepalived配置文件说明可以执行man keepalived.conf查看。

我们假设主服务器IP:192.168.1.103,从服务器ip:192.168.1.101 虚拟ip:192.168.1.110

下面对主服务器的keepalived进行配置：


vi /etc/keepalived/keepalived.conf
global_defs {
   notification_email {
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_http_port {
                script "/opt/nginx_pid.sh"
                interval 2
                weight 2
}
vrrp_instance VI_1 {
    state MASTER        ############ 辅机为 BACKUP
    interface eth0
    virtual_router_id 51
    mcast_src_ip 192.168.1.103
    priority 102                  ########### 权值要比 back 高
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
track_script { 
        chk_http_port ### 执行监控的服务 
        }
    virtual_ipaddress {
       192.168.1.110
    }
}

从服务器：


global_defs {
   notification_email {
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_http_port {
                script "/opt/nginx_pid.sh"
                interval 2
                weight 2
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    mcast_src_ip 192.168.1.101
    priority 101              ##########权值 要比 master 低。。
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
track_script { 
        chk_http_port ### 执行监控的服务 
        }
    virtual_ipaddress {
       192.168.1.110
    }
}

之后分别在主从服务器建立nginx的监控脚本：


vi /opt/nginx_pid.sh
#!/bin/bash
A=`ps -C nginx --no-header |wc -l`               
if [ $A -eq 0 ];then                                       
                /usr/local/nginx/sbin/nginx
                sleep 3
                if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
                       killall keepalived
                fi
fi

然后分别启动主从服务器的keepalived:


service keepalived start

keepalived的测试

我们在主服务器上执行命令ip a，显示如下：


2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

   link/ether 00:0c:29:aa:a1:e4 brd ff:ff:ff:ff:ff:ff

   inet 192.168.1.103/24 brd 255.255.255.255 scope global eth0

   inet 192.168.1.110/32 scope global eth0

证明主服务器已经绑定了虚拟ip 192.168.1.110

在从服务器上执行命令ip a,显示如下：


2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

   link/ether 00:0c:29:2b:94:3b brd ff:ff:ff:ff:ff:ff

   inet 192.168.1.101/24 brd 255.255.255.255 scope global eth0

显示表明从服务器上没有绑定vip 192.168.1.110,只有本机真实ip192.168.1.101

下面我们停止主服务器的nginx进程，再看看ip绑定情况:

主服务器的情况：


2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

   link/ether 00:0c:29:aa:a1:e4 brd ff:ff:ff:ff:ff:ff

   inet 192.168.1.103/24 brd 255.255.255.255 scope global eth0

从服务器的情况：


2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

   link/ether 00:0c:29:2b:94:3b brd ff:ff:ff:ff:ff:ff

   inet 192.168.1.101/24 brd 255.255.255.255 scope global eth0

   inet 192.168.1.110/32 scope global eth0

由此可见vip已经指向了从服务器。


标签：热备,conf,--,keepalived,192.168,nginx,ff,双机
From： https://blog.51cto.com/u_16087105/7040790

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