负载均衡Nginx+KeepAlived

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weeson_lin 2020-02-19 20:58:20 ©著作权

文章标签 负载均衡 文章分类 运维

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192.168.1.150 VOIP 虚拟IP 192.168.1.151 CNSHANK01 负载均衡1 192.168.1.152 CNSHANK02 负载均衡2 系统：Centos7.4

一、nginx配置（两台nginx配置一模一样，主页设置不同）：

安装： yum -y install nginx
配置： vim /etc/nginx/nginx.conf user nginx; worker_processes auto; error_log /var/log/nginx/error.log; pid /run/nginx.pid; include /usr/share/nginx/modules/*.conf; events { worker_connections 12800; use epoll; } http {

include mime.types; default_type application/octet-stream; limit_conn_zone $binary_remote_addr zone=addr:10m; #防IP***

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; #协助部分浏览器（如firefox）识别网页文件的类型 default_type application/octet-stream; include /etc/nginx/conf.d/*.conf;

client_body_buffer_size 1k; #指定客户端请求主体缓冲区大小 client_header_buffer_size 1k; #指定来自客户端请求头的headerbuffer大小 large_client_header_buffers 2 1k; #客户端请求中较大的消息头指定的缓存最大数量和大小 server_tokens off; #禁止在错误页面上显示nginx版本号 client_body_timeout 20; #设置客户端请求主体读取超时时间 client_header_timeout 20; #设置客户端请求头读取超时时间 gzip on;

upstream dynamic { #负载服务器名dynamic ip hash; #采用ip_hash方式 server 192.168.1.154:80;
server 192.168.1.155:80; } server { listen 80 default_server; listen [::]:80 default_server; server_name ; root /usr/share/nginx/html; include /etc/nginx/default.d/*.conf; location / { proxy_pass http://dynamic; #负载均衡代理 limit_conn addr 100; #指定每个ip最多只允许建立100个连接 limit_rate 500k; #每个ip最大带宽是500k proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504 http_404;

    index index.html index.htm;
    autoindex on;
    autoindex_localtime on;
}
location ~* ^.+.(js|css|htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma)$ {
    root html;
}
location ~* ^.+.(?![js|css|htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma])$ {
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
}
error_page 404 /404.html;
    location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
    location = /50x.html {
}

} }

设置配置主页测试文件 cd /usr/share/nginx/html cp ./index.html ./index.html.bak echo “CNSHANK01-192.168.1.151”>./index.html #在主机192.1681.151上 echo “CNSHANK02-192.168.1.152”>./index.html #在主机192.1681.152上
启动 systemctl start nginx systemctl enable nginx

二、keepalived配置： I、主服务器配置（192.168.1.151）： 5. 安装： yum -y install keepalived 6. 配置： vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { } vrrp_script chk_nginx { script "/etc/keepalived/" interval 1 weight -15 } vrrp_instance VI_1 { # 实例，一个vip一个实例 state MASTER #标识为主服务 interface ens33 virtual_router_id 51 #与从机保持一致即可 priority 100 #权重，高于从机 advert_int 1 authentication { # 认证授权，设置验证信息，两个节点必须一致 auth_type PASS auth_pass 123456 } virtual_ipaddress { #虚拟ip地址 192.168.1.150 } track_script { #nginx监控服务 chk_nginx } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" }

添加服务检查脚本（）： vim /etc/keepalived/ #!/bin/bash if [ "pgrep nginx | wc -l" == "0" ] ; then exit 1 else exit 0 fi
通知脚本（notify.sh）： vim /etc/keepalived/notify.sh #!/bin/bash if [ "$1" == "master" ] ; then echo "date '+%F %T'：切换到主机模式" >> /var/log/keepalived/keepalived.log elif [ "$1" == "backup" ] ; then /usr/bin/systemctl start nginx echo "date '+%F %T'：切换到备机模式" >> /var/log/keepalived/keepalived.log else /usr/bin/systemctl start nginx echo "date '+%F %T'：宕机" >> /var/log/keepalived/keepalived.log fi
给脚本添加可执行权限： chmod +x /etc/keepalived/ chmod +x /etc/keepalived/notify.sh
创建日志目录： mkdir /var/log/keepalived
启动： systemctl start keepalived

II、备服务器配置（192.168.1.152）： 12. 安装： yum -y install keepalived

配置： vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { } vrrp_script chk_nginx { script "/etc/keepalived/" interval 1 weight -15 } vrrp_instance VI_1 { state BACKUP #BACKUP模式 interface ens33 virtual_router_id 51 #与主机一致 priority 99 #比主机小 advert_int 1 authentication { #与主机一致 auth_type PASS auth_pass 123456 } virtual_ipaddress { 192.168.1.150 } track_script { chk_nginx } notify_master "/etc/keepalived/notify.sh master" notify_backup "/etc/keepalived/notify.sh backup" notify_fault "/etc/keepalived/notify.sh fault" }
添加服务检查脚本（）： vim /etc/keepalived/ #!/bin/bash if [ "pgrep nginx | wc -l" == "0" ] ; then exit 1 else exit 0 fi
通知脚本（notify.sh）： vim /etc/keepalived/notify.sh #!/bin/bash if [ "$1" == "master" ] ; then echo "date '+%F %T'：切换到主机模式" >> /var/log/keepalived/keepalived.log elif [ "$1" == "backup" ] ; then /usr/bin/systemctl start nginx echo "date '+%F %T'：切换到备机模式" >> /var/log/keepalived/keepalived.log else /usr/bin/systemctl start nginx echo "date '+%F %T'：宕机" >> /var/log/keepalived/keepalived.log fi
给脚本添加可执行权限： chmod +x /etc/keepalived/ chmod +x /etc/keepalived/notify.sh
创建日志目录： mkdir /var/log/keepalived
启动： systemctl start keepalived 三、测试： I、正常状态下

II、停止主服务器：192.168.1.151后测试 19. 停止从服务器nginx服务，结果可以看到访问虚拟IP时候会从主服务器切到从服务器 systemctl stop nginx 20. 查看日志： tail /var/log/keepalived/keepalived.log 主从机日志都显示切到备机模式