Nginx专题(八)Nginx配置高可用的集群

1.Keepalived&＃43;Nginx 高可用集群 &＃xff08;主从模式&＃xff09;

集群架构图&＃xff1a;

2.实验环境

&＃xff08;1&＃xff09;需要两台 nginx 服务器
&＃xff08;2&＃xff09;需要 keepalived
&＃xff08;3&＃xff09;需要虚拟 ip


3.配置高可用的准备工作

&＃xff08;1&＃xff09;需要两台服务器 192.168.70.128 和 192.168.70.130
&＃xff08;2&＃xff09;在两台服务器安装 nginx
&＃xff08;3&＃xff09;在两台服务器安装 keepalived


3.1.准备两台测试服务器

192.168.70.128

192.168.70.130

3.2.在两台服务器安装 nginx

192.168.70.128

192.168.70.130

3.3.在两台服务器安装 keepalived

&＃xff08;1&＃xff09;使用 yum 命令进行安装

yum install keepalived –y


&＃xff08;2&＃xff09;安装之后&＃xff0c;在etc 里面生成目录 keepalived,有文件 keepalived.conf

[root&＃64;centos2 init.d]# cd /etc/
[root&＃64;centos2 etc]# ls keep*
keepalived.conf


4 .完成高可用配置&＃xff08;主从配置&＃xff09;

&＃xff08;1&＃xff09;修改/etc/keepalived/keepalived.conf

192.168.70.128

global_defs {notification_email {acassen&＃64;firewall.locfailover&＃64;firewall.locsysadmin&＃64;firewall.loc}notification_email_from Alexandre.Cassen&＃64;firewall.locsmtp_server 192.168.70.128smtp_connect_timeout 30router_id LVS_DEVEL
}vrrp_script chk_http_port {script "/usr/local/src/nginx_check.sh"interval 2 #&＃xff08;检测脚本执行的间隔&＃xff09;weight 2
}vrrp_instance VI_1 {state MASTER # 备份服务器上将 MASTER 改为 BACKUPinterface ens33 # 网卡virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同priority 90 # 主、备机取不同的优先级&＃xff0c;主机值较大&＃xff0c;备份机值较小advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.70.135 # VRRP H 虚拟地址}
}


192.168.70.130

global_defs {notification_email {acassen&＃64;firewall.locfailover&＃64;firewall.locsysadmin&＃64;firewall.loc}notification_email_from Alexandre.Cassen&＃64;firewall.locsmtp_server 192.168.70.130smtp_connect_timeout 30router_id LVS_DEVEL
}vrrp_script chk_http_port {script "/usr/local/src/nginx_check.sh"interval 2 #&＃xff08;检测脚本执行的间隔&＃xff09;weight 2
}vrrp_instance VI_1 {state BACKUP # 备份服务器上将 MASTER 改为 BACKUPinterface ens33 # 网卡virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同priority 80 # 主、备机取不同的优先级&＃xff0c;主机值较大&＃xff0c;备份机值较小advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.70.135 # VRRP H 虚拟地址}
}


&＃xff08;2 &＃xff09;在/usr/local/src添加脚本

192.168.70.128

#!/bin/bash
A&＃61;&＃96;ps -C nginx –no-header |wc -l&＃96;
if [ $A -eq 0 ];then
/opt/myapp/soft/tengine-2.1.0/sbin/nginx
sleep 2
if [ &＃96;ps -C nginx --no-header |wc -l&＃96; -eq 0 ];then
killall keepalived
fi
fi


[root&＃64;centos2 src]# ls
nginx_check.sh
[root&＃64;centos2 src]# chmod &＃43;755 nginx_check.sh
[root&＃64;centos2 src]# ls
nginx_check.sh


192.168.70.130

#!/bin/bash
A&＃61;&＃96;ps -C nginx –no-header |wc -l&＃96;
if [ $A -eq 0 ];then
/opt/myapp/soft/tengine-2.1.0/sbin/nginx
sleep 2
if [ &＃96;ps -C nginx --no-header |wc -l&＃96; -eq 0 ];then
killall keepalived
fi
fi


[root&＃64;centos3 sbin]# cd /usr/local/src
[root&＃64;centos3 src]# ls
[root&＃64;centos3 src]# vi nginx_check.sh
[root&＃64;centos3 src]# ls
nginx_check.sh
[root&＃64;centos3 src]# chmod &＃43;755 nginx_check.sh
[root&＃64;centos3 src]# ll
total 4
-rwxr-xr-x. 1 root root 194 Apr 13 01:04 nginx_check.sh


&＃xff08;3 &＃xff09;把两台服务器上 nginx 和 和 keepalived 启动
启动 nginx &＃xff1a;

service nginx reload

启动 keepalived &＃xff1a;

systemctl start keepalived.service

5.最终测试

192.168.70.128

192.168.70.130

&＃xff08;1&＃xff09;在浏览器地址栏输入 虚拟 ip 地址 http://192.168.70.135/

&＃xff08;2&＃xff09;把主服务器&＃xff08;192.168.70.128 &＃xff09;nginx 和 和 keepalived 停止&＃xff0c;再输入http://192.168.70.135/

[root&＃64;centos2 src]# service nginx stop
Stopping nginx (via systemctl): [ OK ]
[root&＃64;centos2 src]# systemctl stop keepalived.service


至此为止&＃xff0c;Nginx的高可用搭建完毕&＃xff01;