nginx+keepalived高可用_nginx+keepalived+rabbitmq-优快云博客

本文链接：https://blog.youkuaiyun.com/gdfdgreg/article/details/115543532

nginx服务搭建

环境

centos 7
nginx-1.13.10

安装依赖

安装 nginx 需要先将官网下载的源码进行编译，编译依赖 gcc 环境，如果没有 gcc 环境，则需要安装：yum install gcc-c++
PCRE(Perl Compatible Regular Expressions) 是一个Perl库，包括 perl 兼容的正则表达式库。nginx 的 http 模块使用 pcre 来解析正则表达式，所以需要在 linux 上安装 pcre 库，pcre-devel 是使用 pcre 开发的一个二次开发库。nginx也需要此库。命令：

yum install -y pcre pcre-devel

zlib 库提供了很多种压缩和解压缩的方式， nginx 使用 zlib 对 http 包的内容进行 gzip ，所以需要在 Centos 上安装 zlib 库，命令：yum install -y zlib zlib-devel
OpenSSL 是一个强大的安全套接字层密码库，囊括主要的密码算法、常用的密钥和证书封装管理功能及 SSL 协议，并提供丰富的应用程序供测试或其它目的使用。

nginx 不仅支持 http 协议，还支持 https（即在ssl协议上传输http），所以需要在 Centos 安装 OpenSSL 库。命令：yum install -y openssl openssl-devel

官网下载nginx

nginx官网：https://nginx.org/en/download.html

也可以执行：wget https://nginx.org/download/nginx-1.10.3.tar.gz进行下载

解压nginx源码包

tar -zxvf nginx-1.10.3.tar.gz

cd nginx-1.13.10

编译nginx源码

./configure --prefix=/home/yht/nginx/ (目录根据实际情况而定)

make

make install

进入/home/yht/nginx/conf 修改配置文件

配置文件示例

#user nobody;

worker_processes 1;

#error_log logs/error.log;

#error_log logs/error.log notice;

#error_log logs/error.log info;

#pid logs/nginx.pid;

events {

worker_connections 1024;

}

http {

include mime.types;

default_type application/octet-stream;

#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 logs/access.log main;

sendfile on;

#tcp_nopush on;

#keepalive_timeout 0;

keepalive_timeout 65;

#gzip on;

upstream wwjkhgdv2245.com {

server 192.168.200.83:18757 weight=10;

server 192.168.200.84:8757 weight=10;

}

server {

listen 18080;

server_name wwjkhgdv2245.com;

#charset koi8-r;

#access_log logs/host.access.log main;

location / {

proxy_pass http://wwjkhgdv2245.com;

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;

# redirect server error pages to the static page /50x.html

error_page 500 502 503 504 /50x.html;

location = /50x.html {

root html;

}

# proxy the PHP scripts to Apache listening on 127.0.0.1:80

#location ~ \.php$ {

# proxy_pass http://127.0.0.1;

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000

#location ~ \.php$ {

# root html;

# fastcgi_pass 127.0.0.1:9000;

# fastcgi_index index.php;

# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;

# include fastcgi_params;

# deny access to .htaccess files, if Apache's document root

# concurs with nginx's one

#location ~ /\.ht {

# deny all;

}

# another virtual host using mix of IP-, name-, and port-based configuration

#server {

# listen 8000;

# listen somename:8080;

# server_name somename alias another.alias;

# location / {

# root html;

# index index.html index.htm;

# }

# HTTPS server

#server {

# listen 443 ssl;

# server_name localhost;

# ssl_certificate cert.pem;

# ssl_certificate_key cert.key;

# ssl_session_cache shared:SSL:1m;

# ssl_session_timeout 5m;

# ssl_ciphers HIGH:!aNULL:!MD5;

# ssl_prefer_server_ciphers on;

# location / {

# root html;

# index index.html index.htm;

# }

}

nginx服务启动

进入nginx文件夹
启动前最好先检查配置文件

sbin/nginx -t

启动nginx

sbin/nginx

停止nginx

sbin/nginx -s stop

nginx编译时的一些配置

nginx.pid

pid文件就是一个纯文本文件，里面记录的是进程的pid号,nginx使用了pid文件来记录master process的pid号，如果编译时没有指定，那它的路径就是: prefix/

logs/nginx.pid,其中prefix就是nginx的安装路径

keepalived服务搭建

注：只在root用户下安装成功

安装依赖，编译安装keepalived包

yum install -y popt-devel

cd /usr/local/src

tar zxvf keepalived-1.2.2.tar.gz

cd keepalived-1.2.2

./configure --prefix=/

make

make install

修改配置文件

cd /etc/keepalived
cp keepalived.conf keepalived.conf.bak
vim keepalived.conf
配置事例

! Configuration File for keepalived

global_defs {

notification_email {

admin@test.com

}

notification_email_from admin@test.com

smtp_server xxx.smtp.com

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script Monitor_Nginx {

script "/root/monitor_nginx.sh"

interval 2

weight 2

}

vrrp_instance VI_1 {

state MASTER #(主机为MASTER，备用机为BACKUP)

interface enp4s0 #(HA监测网络接口)

virtual_router_id 61 #(主、备机的virtual_router_id必须相同)

#mcast_src_ip 192.168.0.99 #(多播的源IP，设置为本机外网IP，与VIP同一网卡)此项可不设置

priority 90 #(主、备机取不同的优先级，主机值较大，备份机值较小,值越大优先级越高)

advert_int 1 #(VRRP Multicast广播周期秒数)

authentication {

auth_type PASS #(VRRP认证方式)

auth_pass 1234 #(密码)

}

track_script {

/etc/keepalived/monitor_nginx.sh #(调用nginx进程检测脚本)

}

virtual_ipaddress {

10.100.1.245 #(VRRP HA虚拟地址)

}

创建nginx检测脚本

cd cd /etc/keepalived
vim monitor_nginx.sh
脚本内容

#!/bin/bash

if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]

then

killall keepalived

保存文件退出
将文件设置为可执行程序 chmod +x monitor_nginx.sh

启动、停止、重启keepalived

service keepalived start
service keepalived stop
service keepalived restart

判断keepalived是否启动成功

查看是否有keepalived进程

执行ps aux | grep keepalived

查看虚拟ip是否存在（只能在主节点上查看，当主节点宕掉，负节点才会创建，可以作为测试）

执行ip add show HA监测网络接口（这里设置的是enp4s0）
查看是否存在设置的虚拟ip(这里设置的是10.100.1.245)