三、架构02-Keepalived+Nginx+双主模型实现站点高可用

一、Nginx+Keepalived实现站点高可用、

1、架构图
image.png
2、环境：

node01:192.168.32.132 keepalived
node02:192.168.32.128 keepalived
node03:192.168.32.131 web01
node03:192.168.32.134 web02
node03:192.168.32.135 web03

3、配置web服务
[root@node03 conf.d]# vim /etc/hosts
192.168.32.132 node01 node01.hehe.com
192.168.32.128 node02 node02.hehe.com
192.168.32.131 node03 node03.hehe.com
192.168.32.134 node03 node03.hehe.com
192.168.32.135 node03 node03.hehe.com
192.168.32.133 node04 node04.hehe.com
[root@node03 ~]# yum install -y httpd
[root@node03 conf.d]# vim vhosts.conf
<VirtualHost 192.168.32.131:80>
    ServerName 192.168.32.131
    DocumentRoot "/data/web/vhost1"
    <Directory "/data/web/vhost1">
        Options FollowSymLinks
        AllowOverride None
        Require all granted
    </Directory>
</VirtualHost>
<VirtualHost 192.168.32.134:80>
    ServerName 192.168.32.134
    DocumentRoot "/data/web/vhost2"
    <Directory "/data/web/vhost2">
        Options FollowSymLinks
        AllowOverride None
        Require all granted
    </Directory>
</VirtualHost>
<VirtualHost 192.168.32.135:80>
    ServerName 192.168.32.135
    DocumentRoot "/data/web/vhost3"
    <Directory "/data/web/vhost3">
        Options FollowSymLinks
        AllowOverride None
        Require all granted
    </Directory>
</VirtualHost>
[root@node03 conf.d]# mkdir -pv /data/web/vhost{1,2,3}
[root@node03 conf.d]# vim /data/web/vhost1/index.html
<h1>Vhost2</h1>
[root@node03 conf.d]# vim /data/web/vhost2/index.html
<h1>Vhost2</h1>
[root@node03 conf.d]# vim /data/web/vhost3/index.html
<h1>Vhost3</h1>
[root@node03 conf.d]# systemctl start httpd
4、配置node01keepalived服务
[root@node01 ~]# yum install -y keepalived
[root@node01 ~]# yum install -y nginx
[root@node01 ~]# vim /etc/hosts
192.168.32.132 node01 node01.hehe.com
192.168.32.128 node02 node02.hehe.com
192.168.32.131 node03 node03.hehe.com
192.168.32.134 node03 node03.hehe.com
192.168.32.135 node03 node03.hehe.com
192.168.32.133 node04 node04.hehe.com
[root@node01 keepalived]# ls
keepalived.conf  keepalived.conf.bak  keep_down.sh  notify.sh
[root@node01 keepalived]# keepalived.conf
! Configuration File for keepalived
global_defs {
   notification_email {
        root@localhost
}
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id node01
   vrrp_mcast_group4 224.1.101.33
}
vrrp_script chk_down {
    script "/etc/keepalived/keep_down.sh"
    weight -10
    interval 1
    fall 1
    rise 1
}
vrrp_instance VI_1 {
    state MASTER
    priority 100
    interface ens33
    virtual_router_id 51
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass IGsPtR1X3w
    }
    virtual_ipaddress {
        192.168.32.188/16 dev ens33 label ens33:0
    }
    track_script {
        chk_down
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
}
vrrp_instance VI_2 {
    state BACKUP
    priority 96
    interface ens33
    virtual_router_id 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass IGsPt3w
    }
    virtual_ipaddress {
        192.168.32.166/16 dev ens33 label ens33:1
    }
    track_script {
        chk_down
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
}
[root@node01 keepalived]# vim notify.sh
#!/bin/bash
#
contact='root@localhost'
notify() {
        local mailsubject="$(hostname) to be $1, vip floating"
        local mailbody="$(date +'%F %T'): vrrp transition, $(hostname) changed to be $1"
        echo "$mailbody" | mail -s "$mailsubject"  $contact
}
case $1 in
master)
        notify master
        systemctl start nginx
        ;;
backup)
        systemctl start nginx
        notify backup
        ;;
fault)
        systemctl stop nginx
        notify fault
        ;;
*)
        echo "Usage: $(basename $0) {master|backup|fault}"
        exit 1
        ;;
esac
[root@node01 keepalived]# vim keep_down.sh
#!/bin/bash
if [ -f /etc/keepalived/down ];then
exit 1
else
exit 0
fi
5、配置node02keepalived服务
[root@node02 keepalived]# vim keepalived.conf
! Configuration File for keepalived
global_defs {
   notification_email {
        root@localhost
}
   notification_email_from keepalived@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id node02
   vrrp_mcast_group4 224.1.101.33
}
vrrp_script chk_down {
    script "/etc/keepalived/keep_down.sh"
    weight -10
    interval 1
    fall 1
    rise 1
}
vrrp_instance VI_1 {
    state BACKUP
    priority 96
    interface ens33
    virtual_router_id 51
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass IGsPtR1X3w
    }
    virtual_ipaddress {
        192.168.32.188/16 dev ens33 label ens33:0
    }
    track_script {
    chk_down
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault  "/etc/keepalived/notify.sh fault"
}
vrrp_instance VI_2 {
    state MASTER
    priority 100
    interface ens33
    virtual_router_id 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass IGsPt3w
    }
    virtual_ipaddress {
        192.168.32.166/16 dev ens33 label ens33:1
    }
    track_script {
        chk_down
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
}
[root@node02 keepalived]# vim notify.sh
#!/bin/bash
#
contact='root@localhost'
notify() {
        local mailsubject="$(hostname) to be $1, vip floating"
        local mailbody="$(date +'%F %T'): vrrp transition, $(hostname) changed to be $1"
        echo "$mailbody" | mail -s "$mailsubject"  $contact
}
case $1 in
master)
        systemctl start nginx
        notify master
        ;;
backup)
        systemctl start nginx
        notify backup
        ;;
fault)
        systemctl stop nginx
        notify fault
        ;;
*)
        echo "Usage: $(basename $0) {master|backup|fault}"
        exit 1
        ;;
esac
[root@node02 keepalived]# vim keep_down.sh
#!/bin/bash
if [ -f /etc/keepalived/down ];then
exit 1
else
exit 0
fi
6、配置node01、node02的nginx服务
[root@node01 nginx]# vim nginx.conf
    upstream websrvs {
        server 192.168.32.131:80;
        server 192.168.32.134:80;
        server 192.168.32.135:80;
    }
    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  _;
        root         /usr/share/nginx/html;
        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;
        location / {
                proxy_pass http://websrvs;
        }
 [root@node02 nginx]# vim nginx.conf
    upstream websrvs {
        server 192.168.32.131:80;
        server 192.168.32.134:80;
        server 192.168.32.135:80;
    }
    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  _;
        root         /usr/share/nginx/html;
        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;
        location / {
                proxy_pass http://websrvs;
        }
7、启动node01、node02的keepalived、nginx服务
[root@node01 ~]# systemctl start keepalived
[root@node02 ~]# systemctl start keepalived
[root@node01 ~]# systemctl start nginx
[root@node02 ~]# systemctl start nginx
8、验证
[40796.DESKTOP-Q4O3FV5] ➤ curl http://192.168.32.188
<h1>Vhost1</h1>
[40796.DESKTOP-Q4O3FV5] ➤ curl http://192.168.32.188
<h1>Vhost2</h1>
[40796.DESKTOP-Q4O3FV5] ➤ curl http://192.168.32.188
<h1>Vhost1</h1>
[40796.DESKTOP-Q4O3FV5] ➤ curl http://192.168.32.166
<h1>Vhost1</h1>
[40796.DESKTOP-Q4O3FV5] ➤ curl http://192.168.32.166
<h1>Vhost2</h1>
[40796.DESKTOP-Q4O3FV5] ➤ curl http://192.168.32.166
<h1>Vhost3</h1>
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