集群开机顺序：
1、从后往前开。
编译安装nginx负载均衡
下载：
mkdir -p /server/tools
cd /server/tools
wget http://nginx.org/download/nginx-1.16.0.tar.gz
#安装依赖。
yum install pcre pcre-devel -y
yum install openssl openssl-devel -y #https加密用他。
#编译安装步骤
tar xf nginx-1.16.0.tar.gz
cd nginx-1.16.0/
useradd -u 1111 -s /sbin/nologin nginx -M
id nginx
./configure --user=nginx --group=nginx --prefix=/application/nginx-1.16.0/ --with-http_stub_status_module --with-http_ssl_module --with-pcre
make
make install
ln -s /application/nginx-1.16.0/ /application/nginx
/application/nginx/sbin/nginx
netstat -lntup|grep nginx
curl 127.0.0.1
负载均衡模板配置：
upstream backend {
server 10.0.0.7:80 weight=1;
server 10.0.0.8:80 weight=1;
}
server {
listen 80;
server_name blog.etiantian.org;
location / {
proxy_pass http://backend;
}
}
upstream 模块 负载均衡池。
backend 负载均衡池名称
[root@lb01 conf]# egrep -v "^$|#" nginx.conf.default >nginx.conf
正式配置：
[root@lb01 conf]# cat nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream backend {
server 10.0.0.7:80 weight=3;
server 10.0.0.8:80 weight=1;
}
server {
listen 80;
server_name www.etiantian.org;
location / {
proxy_pass http://backend;
proxy_set_header Host $host;
}
}
}
别忘了，提前配置web服务器的www虚拟主机
WEB01:
[root@web01 /etc/nginx/conf.d]# cat www.conf
server {
listen 80;
server_name www.etiantian.org;
location / {
root /usr/share/nginx/html/www;
index index.html;
}
}
[root@web01 /etc/nginx/conf.d]# cat /usr/share/nginx/html/www/index.html
www7
WEB02:
[root@web02 /application/nginx/html/www]# cd /application/nginx/conf/extra/
[root@web02 /application/nginx/conf/extra]# cat 01_www.conf
server {
listen 80;
server_name etiantian.org;
rewrite ^/(.*) http://www.etiantian.org/$1 permanent;
}
server {
listen 80;
server_name www.etiantian.org;
location / {
root html/www;
index index.html index.htm;
}
autoindex on;
access_log logs/access_www.log main;
}
[root@web02 /application/nginx/conf/extra]# cat ../../html/www/index.html
www8
增加blog负载均衡
[root@lb01 conf]# cat nginx.conf
worker_processes 1;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
sendfile on;
keepalive_timeout 65;
upstream backend {
server 10.0.0.7:80 weight=3;
server 10.0.0.8:80 weight=2;
}
server {
listen 80;
server_name www.etiantian.org;
location / {
proxy_pass http://backend;
proxy_set_header Host $host;
}
}
server {
listen 80;
server_name blog.etiantian.org;
location / {
proxy_pass http://backend;
proxy_set_header Host $host;
}
}
}
默认情况浏览器请求负载均衡器，会携带host字段，但是Nginx代理向后请求节点
默认在请求头里不带host字段。
配置Nginx代理向后请求节点默认在请求头里带host字段配置参数：
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
#<==这是反向代理时，节点服务器获取用户真实IP的必要功能配置。
在反向代理请求后端节点服务器的请求头中增加获取的客户端IP的字段信息，然后节点后端可以通过程序或者相关的配置接收X-Forwarded-For传过来的用户真实IP的信息。
负载均衡模板配置：
upstream backend {
server 10.0.0.7:80 weight=1;
server 10.0.0.8:80 weight=1;
}
upstream blog_server_pool {
server 10.0.10.6; #<==这一行标签和下一行是等价的。
server 10.0.10.6:80 weight=1 max_fails=1 fail_timeout=10s;
nginx upstream监测节点状态，把不好的踢出去。好的时候加进来。
