keepalive和nginx高可用集群

keepalived 和 nginx 高可用集群搭建

主备模式

zyj86主机和zyj87主机安装nginx和keepalived

yum install nginx keepalived -y
systemctl enable --now nginx.service keepalived.service

主调度器配置

编辑zyj86主机（主）配置文件

vi /etc/keepalived/keepalived.conf

global_defs {notification_email {[e-mail]@[e-mail]}notification_email_from [e-mail]_server 192.168.3.86smtp_connect_timeout 30router_id zyj86 # 访问到主机，本机的hostname，需要修改
}vrrp_script chk_nginx {script "/etc/keepalived/nginx_check.sh" # 检测脚本位置interval 2 #（检测脚本执行的间隔）weight 2 # 权重
}vrrp_instance VI_1 {state MASTER # 备份服务器上将 MASTER 改为 BACKUP，需要修改interface ens160 #网卡名字，使用ifconfig查看，需要修改virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同priority 100 # 主、备机取不同的优先级，主机值较大，备份机值较小，一般主100从90advert_int 1 # 每隔1秒发送心跳authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.3.188 #VRRP虚拟地址，也可以绑定多个虚拟ip}track_script {chk_nginx}}

重启keepalived

systemctl restart keepalived.service 

从调度器配置

编辑zyj87主机（从）配置文件

vi /etc/keepalived/keepalived.conf

global_defs {notification_email {[e-mail]@[e-mail]}notification_email_from [e-mail]_server 192.168.3.87smtp_connect_timeout 30router_id zyj87 # 访问到主机，本机的hostname，需要修改
}vrrp_script chk_nginx {script "/etc/keepalived/nginx_check.sh" # 检测脚本位置interval 2 #（检测脚本执行的间隔）weight 2 # 权重
}vrrp_instance VI_1 {state BACKUP # 备份服务器上将 MASTER 改为 BACKUP，需要修改interface ens160 #网卡名字，使用ifconfig查看，需要修改virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同priority 99 # 主、备机取不同的优先级，主机值较大，备份机值较小，一般主100从90advert_int 1 # 每隔1秒发送心跳authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.3.188 #VRRP虚拟地址，也可以绑定多个虚拟ip}track_script {chk_nginx}}

重启keepalived

systemctl restart keepalived.service 

zyj86 zyj87主机编写Nginx状态检测脚本

vi /etc/keepalived/nginx_check.sh

#!/bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then# 这里需要替换成自己的nginx安装路径# 尝试重新启动nginxsystemctl restart nginx# 睡眠2秒sleep 2if [ $A -eq 0 ];then#启动失败，将keepalived服务杀死。killall keepalivedfi
fi

给脚本添加执行权限

chmod +x /etc/keepalived/nginx_check.sh

修改zyj86和zyj87主机的nginx配置文件

vi /etc/nginx/nginx.conf

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;events {worker_connections 1024;
}http {log_format  main  '$remote_addr - $remote_user [$time_local] "$request" ''$status $body_bytes_sent "$http_referer" ''"$http_user_agent" "$http_x_forwarded_for"';access_log  /var/log/nginx/access.log  main;sendfile            on;tcp_nopush          on;tcp_nodelay         on;keepalive_timeout   65;types_hash_max_size 2048;include             /etc/nginx/mime.types;default_type        application/octet-stream;# 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;#访问主机列表upstream myserver {server 192.168.3.88  weight=1;server 192.168.3.89  weight=1;}server {listen       80 default_server;listen       [::]:80 default_server;server_name  _;# Load configuration files for the default server block.include /etc/nginx/default.d/*.conf;location / {proxy_pass http://myserver;}}}

重启nginx

systemctl restart nginx

后台服务器配置

yum install httpd -y

zyj88主机

echo 88 > /var/www/html/index.html

zyj89主机

echo 89 > /var/www/html/index.html

启动服务

systemctl enable --now httpd

访问测试：

当其中一台调度器宕机后依旧可以访问

互为主备模式

zyj86主机和zyj87主机安装nginx和keepalived

yum install nginx keepalived -y
systemctl enable --now nginx.service keepalived.service

第一台调度器配置

编辑zyj86主机配置文件

vi /etc/keepalived/keepalived.conf

global_defs {notification_email {[e-mail]@[e-mail]}notification_email_from [e-mail]_server 192.168.3.86smtp_connect_timeout 30router_id zyj86 # 访问到主机，本机的hostname，需要修改
}vrrp_script chk_nginx {script "/etc/keepalived/nginx_check.sh" # 检测脚本位置interval 2 #（检测脚本执行的间隔）weight 2 # 权重
}vrrp_instance VI_1 {state MASTER # 备份服务器上将 MASTER 改为 BACKUP，需要修改interface ens160 #网卡名字，使用ifconfig查看，需要修改virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同priority 100 # 主、备机取不同的优先级，主机值较大，备份机值较小，一般主100从90advert_int 1 # 每隔1秒发送心跳authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.3.188 # VRRP虚拟地址，也可以绑定多个虚拟ip}track_script {chk_nginx}
}vrrp_instance VI_2 {state BACKUP # 备份服务器上将 MASTER 改为 BACKUP，需要修改interface ens160 #网卡名字，使用ifconfig查看，需要修改virtual_router_id 52 # 主、备机的 virtual_router_id 必须相同priority 79 # 主、备机取不同的优先级，主机值较大，备份机值较小，一般主100从90advert_int 1 # 每隔1秒发送心跳authentication {auth_type PASSauth_pass 2222}virtual_ipaddress {192.168.3.199 #VRRP虚拟地址，也可以绑定多个虚拟ip}track_script {chk_nginx}
}

重启keepalived

systemctl restart keepalived.service 

第二台调度器配置

编辑zyj87主机配置文件

global_defs {notification_email {[e-mail]@[e-mail]}notification_email_from [e-mail]_server 192.168.3.86smtp_connect_timeout 30router_id zyj86 # 访问到主机，本机的hostname，需要修改
}vrrp_script chk_nginx {script "/etc/keepalived/nginx_check.sh" # 检测脚本位置interval 2 #（检测脚本执行的间隔）weight 2 # 权重
}vrrp_instance VI_1 {state BACKUP # 备份服务器上将 MASTER 改为 BACKUP，需要修改interface ens160 #网卡名字，使用ifconfig查看，需要修改virtual_router_id 51 # 主、备机的 virtual_router_id 必须相同priority 99 # 主、备机取不同的优先级，主机值较大，备份机值较小，一般主100从90advert_int 1 # 每隔1秒发送心跳authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.3.188 # VRRP虚拟地址，也可以绑定多个虚拟ip}track_script {chk_nginx}
}vrrp_instance VI_2 {state MASTER # 备份服务器上将 MASTER 改为 BACKUP，需要修改interface ens160 #网卡名字，使用ifconfig查看，需要修改virtual_router_id 52 # 主、备机的 virtual_router_id 必须相同priority 80 # 主、备机取不同的优先级，主机值较大，备份机值较小，一般主100从90advert_int 1 # 每隔1秒发送心跳authentication {auth_type PASSauth_pass 2222}virtual_ipaddress {192.168.3.199 #VRRP虚拟地址，也可以绑定多个虚拟ip}track_script {chk_nginx}
}

重启keepalived

systemctl restart keepalived.service 

zyj86 zyj87主机编写Nginx状态检测脚本

vi /etc/keepalived/nginx_check.sh

#!/bin/bash
A=`ps -C nginx --no-header |wc -l`
if [ $A -eq 0 ];then# 这里需要替换成自己的nginx安装路径# 尝试重新启动nginxsystemctl restart nginx# 睡眠2秒sleep 2if [ $A -eq 0 ];then#启动失败，将keepalived服务杀死。killall keepalivedfi
fi

给脚本添加执行权限

chmod +x /etc/keepalived/nginx_check.sh

修改zyj86和zyj87主机的nginx配置文件

vi /etc/nginx/nginx.conf

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;events {worker_connections 1024;
}http {log_format  main  '$remote_addr - $remote_user [$time_local] "$request" ''$status $body_bytes_sent "$http_referer" ''"$http_user_agent" "$http_x_forwarded_for"';access_log  /var/log/nginx/access.log  main;sendfile            on;tcp_nopush          on;tcp_nodelay         on;keepalive_timeout   65;types_hash_max_size 2048;include             /etc/nginx/mime.types;default_type        application/octet-stream;# 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;#访问主机列表upstream myserver {server 192.168.3.88  weight=1;server 192.168.3.89  weight=1;}server {listen       80 default_server;listen       [::]:80 default_server;server_name  _;# Load configuration files for the default server block.include /etc/nginx/default.d/*.conf;location / {proxy_pass http://myserver;}}}

重启nginx

systemctl restart nginx

后台服务器配置

yum install httpd -y

zyj88主机

echo 88 > /var/www/html/index.html

zyj89主机

echo 89 > /var/www/html/index.html

启动服务

systemctl enable --now httpd

访问测试：

当其中一台调度器宕机后依旧可以访问