CentOS 7.9 64位安装nginx，部署tomcat实现负载均衡

在CentOS 7.9 中安装nginx做负载均衡步骤
用ubuntu试了一下没成功 centos更顺利，当初听到什么nginx，负载均衡，反向代理，redis这些就潜意识就觉得好复杂，今天花一下午时间尝试了一下，感觉也没那么难，至少简单上手还是可以的，毕竟网上资料也多，记录一下实现步骤
具体步骤：
1.先安装centos系统
2.先安装需要的环境：

yum -y install make zlib zlib-devel gcc-c++ libtool  openssl openssl-devel

3.下载pcre

 cd /usr/local/src/wget http://downloads.sourceforge.net/project/pcre/pcre/8.35/pcre-8.35.tar.gztar zxvf pcre-8.35.tar.gz

4.打开文件

cd pcre-8.35
./configure
make && make install

5.查看pcre是否安装成功看到版本号说明成功了

pcre-config --version

6.下载nginx包

cd /usr/local/src/
wget http://nginx.org/download/nginx-1.6.2.tar.gz
tar zxvf nginx-1.6.2.tar.gz
cd nginx-1.6.2
./configure --prefix=/usr/local/webserver/nginx --with-http_stub_status_module --with-http_ssl_module --with-pcre=/usr/local/src/pcre-8.35
make
make install

7.查看nginx是否安装成功，看见版本好说明成功了

/usr/local/webserver/nginx/sbin/nginx -v

8.安装jdk11

查看可以下载的jdk yum -y list java*
yum -y install java-11-openjdk.x86_64

9.安装tomcat
下载路径tomcat，这里注意如果你下载最新的要注意jdk版本是否能对上，低版本的jdk在高版本的tomcat上用不了,下载完成上传到虚拟机中
10.修改tomcat里面的端口号，这里修改两个地方
(1) Server标签里的这个port端口，只要不重复就行
(2)Connector 标签里面的 port端口
这里我是部署了3个tomcat所以修改三次

 vi /tmp/apache-tomcat-18081/conf/server.xml <Server port="8005" shutdown="SHUTDOWN"> <Connector port="18081" protocol="HTTP/1.1"connectionTimeout="20000"redirectPort="8443"maxParameterCount="1000"/>vi /tmp/apache-tomcat-18082/conf/server.xml <Server port="8006" shutdown="SHUTDOWN"> <Connector port="18082" protocol="HTTP/1.1"connectionTimeout="20000"redirectPort="8443"maxParameterCount="1000"/>
vi /tmp/apache-tomcat-18083/conf/server.xml <Server port="8007" shutdown="SHUTDOWN"> <Connector port="18081" protocol="HTTP/1.1"connectionTimeout="20000"redirectPort="8443"maxParameterCount="1000"/>

11.启动tomcat,如果tomcat没有启动可以看看里面的日志信息，启动成功就可以访问，我是用的阿里云服务器所以相关的端口在控制的开启
，如果是自己本地安装的服务器需要自己手动开放端口

/tmp/apache-tomcat-18081/bin/startup.sh
/tmp/apache-tomcat-18082/bin/startup.sh
/tmp/apache-tomcat-18083/bin/startup.sh
cat /tmp/apache-tomcat-18081/logs/catalina.out

12.配置nginx 反向代理实现负载均衡
创建 Nginx 运行使用的用户zqj

 /usr/sbin/groupadd zqj/usr/sbin/useradd -g zqj zqjcat /usr/local/webserver/nginx/conf/nginx.conf

13.这是我的配置文件里面的重点是配置了，对应找一下改成自己的 upstream 这个后面的tomcatserver别包含特殊符号，不然会报错，运行不起来
1.upstream tomcatserver
2. location / {
root /usr/share/nginx/html;
index index.html index.htm;
proxy_pass http://tomcatserver;
}

user zqj zqj;
worker_processes 2; #设置值和CPU核心数一致
error_log /usr/local/webserver/nginx/logs/nginx_error.log crit; #日志位置和日志级别
pid /usr/local/webserver/nginx/nginx.pid;
#Specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 65535;
events
{use epoll;worker_connections 65535;
}
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';#charset gb2312;server_names_hash_bucket_size 128;client_header_buffer_size 32k;large_client_header_buffers 4 32k;client_max_body_size 8m;sendfile on;tcp_nopush on;keepalive_timeout 60;tcp_nodelay on;fastcgi_connect_timeout 300;fastcgi_send_timeout 300;fastcgi_read_timeout 300;fastcgi_buffer_size 64k;fastcgi_buffers 4 64k;fastcgi_busy_buffers_size 128k;fastcgi_temp_file_write_size 128k;gzip on; gzip_min_length 1k;gzip_buffers 4 16k;gzip_http_version 1.0;gzip_comp_level 2;gzip_types text/plain application/x-javascript text/css application/xml;gzip_vary on;#limit_zone crawler $binary_remote_addr 10m;
upstream tomcatserver {server 127.0.0.1:18081;server 127.0.0.1:18082;server 127.0.0.1:18083;
}#下面是server虚拟主机的配置server{listen 80;#监听端口server_name localhost;#域名index index.html index.htm index.php;root /usr/local/webserver/nginx/html;#站点目录location ~ .*\.(php|php5)?${#fastcgi_pass unix:/tmp/php-cgi.sock;fastcgi_pass 127.0.0.1:9000;fastcgi_index index.php;include fastcgi.conf;}location / {root   /usr/share/nginx/html;index  index.html index.htm;proxy_pass http://tomcatserver;}location ~ .*\.(gif|jpg|jpeg|png|bmp|swf|ico)${expires 30d;# access_log off;}location ~ .*\.(js|css)?${expires 15d;# access_log off;}access_log off;}}