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The following brings you Nginx+Tomcat Load Balancer cluster building steps and process is what kind of, I hope to be able to bring you some help in the actual application, Load Balancer involves more things, theory is not much, there are many books online, today we use the accumulated experience in the industry to do an answer.

Tomcat was originally developed by Sun Software Architect James Duncan. After Davidson develops and installs Tomcat, the directories and files below the installation path are important files for using or configuring Tomcat. Tomcat important directory bin: stores Tomcat startup and shutdown scripts conf: stores Tomcat different configuration files doc: stores Tomcat documents lib/japser/common: stores Tomcat library files required for operation logs: stores Tomcat LOG files src: Webapps:Tomcat's primary Web distribution directory work: Nginx is a very good HTTP Cloud Virtual Machine software support up to 50 000 0 concurrent connection response has strong static resource processing capacity stable operation memory, CPU and other system resource consumption is very low At present, many large websites apply Nginx server as a reverse proxy and Load Balancer for backend website programs. Nginx Load Balancer Implementation Principle Nginx Implementation Load Balancer is a reverse proxy principle implemented by reverse proxy

Nginx configures the main parameters of the reverse proxy upstream service pool name { } configures the backend server pool to provide response data proxy_pass http://service pool name configures the server processing that forwards access requests to the backend server pool Nginx+Tomcat Load Balancer Cluster Lab Environment Nginx Server IP Address: 192.168.80.177Tomcat1 Server IP Address: 192.168.80.151Tomcat2 Server IP Address: 192.168.80.178client Test Machine Build Load Balancer Install and configure Tomcat service on Tomcat1 and Tomcat2 servers (web page content on Tomcat2 is accp and other configurations are the same)[root@tomcat1 ~]# systemctl stop firewalld.service //Close Fire Wall [root@tomcat1 ~]# mkdir /abc[root@tomcat1 ~]# mount.cifs //192.168.100.8/LNMP-C7[root@tomcat1 ~]# cd /abc/tomcat/[root@tomcat1 tomcat]# tar zxvf jdk-8u91-linux-x64.tar.gz -C /usr/local/ //extract JDK[root@tomcat1 tomcat]# vim /etc/profile //Configure environment variables... export JAVA_HOME=/usr/local/jdk1.8.0_91export JRE_HOME=${JAVA_HOME}/jreexport CLASSPATH=.:$ {JAVA_HOME}/lib:${JRE_HOME}/libexport PATH=${JAVA_HOME}/bin:$PATH[root@tomcat1 tomcat]# source /etc/profile //Refresh configuration file [root@tomcat1 tomcat]# tar zxvf apache-tomcat-8.5.16.tar.gz -C /usr/local/ //Decompress [root@tomcat1 tomcat]# cd /usr/local/[root@tomcat1 local]# mv apache-tomcat-8.5.16/ tomcat[root@tomcat1 local]# ln -s /usr/local/tomcat/bin/www.example.com/usr/local/bin/startup.sh //Start and close scripts for system recognition [root@tomcat1 local]# ln -s /usr/local/tomcat/bin/shutdown.sh[root@tomcat1 local]# mkdir -p /web/webapp1 The requested URL/web/webapp1/index.jsp was not found on this server. //write jsp web content JSP test1 page //Output information [root@tomcat1 local]#vim/usr/local/tomcat/conf/server.xml //modify Tomcat configuration file ##Add site information [root@tomcat1 ~]# startup.sh //start service

Install and configure Nginx server

[root@nginx ~]# systemctl stop firewalld.service ##Turn off firewall [root@nginx ~]# setenforce 0[root@nginx ~]# yum install pcre-devel zlib-devel gcc gcc-c++ make -y ##Install environment essentials [root@nginx ~]# mkdir /abc[root@nginx ~]# mount.cifs www.example.com/abc///192.168.100.3/LNMP-C7 ##mount Password for //192.168.100.3/LNMP-C7: [root@nginx ~]# cd /abc/[root@nginx abc]# tar zxvf nginx-1.12.2.tar.gz-C /usr/local/ ##decompress [root@nginx abc]# useradd -M -s /sbin/nologin nginx ##Create system user [root@nginx abc]# cd /usr/local/nginx-1.12.2/[root@nginx nginx-1.12.2]# ./ configure \ ##Configuration> --prefix=/usr/local/nginx \> --user=nginx \> --group=nginx\> --with-http_stub_status_module \> --with-http_gzip_static_module \> --with-http_flv_module [root@nginx nginx-1.12.2]# make & make install ##compile install [root@nginx nginx-1.12.2]# vim /usr/local/nginx/conf/nginx.conf#keepalive_timeout 0; keepalive_timeout 65; #gzip on; upstream tomcat-server { #Add address pool server 192.168.80.151:8080 weight=1; server 192.168.80.178:8080 weight=1; } server { listen 80;..... Omit location / { root html; index index.html index.htm; proxy_pass http://tomcat-server; #Add proxy, invoke server address pool }[root@nginx nginx-1.12.2]# ln -s /usr/local/nginx/sbin/nginx /usr/local/sbin/ ##for system recognition [root@nginx nginx-1.12.2]# nginx ##Open Service Use client tester to access nginx proxy server

Nginx configuration file [root@nginx nginx-1.12.2]# vim /etc/init.d/nginx //Write service startup script #!/ bin/bash# chkconfig: - 99 20# description: Nginx Service Control ScriptPROG="/usr/local/nginx/sbin/nginx"PIDF="/usr/local/nginx/logs/nginx.pid"case "$1" instart) $PROG ;;stop) kill -s QUIT $(cat $PIDF) ;;restart) $0 stop $0 start ;;reload) kill -s HUP $(cat $PIDF) ;;*) echo "Usage: $0 {start|stop|restart|reload}" exit 1esacexit 0[root@nginx nginx-1.12.2]# chmod +x /etc/init.d/nginx [root@nginx nginx-1.12.2]# chkconfig --add nginx[root@nginx nginx-1.12.2]# vim /usr/local/nginx/conf/nginx.confserver {... Omit... location ~.*. jsp$ { //match jsp page jump proxy server pool proxy_pass http://tomcat-server; proxy_set_header Host $host; } location / { root html/test; ##Modify Site index index.html index.htm; proxy_pass http://tomcat-server; }[root@nginx nginx-1.12.2]# vim /usr/local/nginx/html/index.html //Write static pages Static pages body {width: 35em;margin: 0 auto;font-family: Tastoma, Verdana, Arial, sans-serif;} Static pages

This is a static page.

[root@nginx nginx-1.12.2]# service nginx stop ##Turn off service [root@nginx nginx-1.12.2]# service nginx startCreate jsp dynamic page on Tomcat1, Tomcat2 server [root@tomcat1 ~]# mkdir /usr/local/tomcat/webapps/test[root@tomcat1 ~]#vim/usr/local/tomcat/webapps/test/index.jsp dynamic pageDynamic page1//Modify to dynamic page2 on Tomcat2//Visit static 192.168.13.177/ dynamic http: //192.168.13.177/test/index.jsp Configure Nginx to handle static images, Tomcat to handle dynamic pages Configure [root@tomcat1 ~]#vim/usr/local/tomcat/webapps/test/index.jsp dynamic pages on both Tomcat servers

//Add page image [root@tomcat01 local]# vim/usr/local/tomcat/conf/server. xml//Add the following entry under line 149,[root@tomcat1 test]#shutdown.sh //Close Restart [root@tomcat1 test]# startup.sh Modify Nginx configuration file on Nginx server [root@nginx nginx-1.12.2]# vim /usr/local/nginx/conf/nginx. conflict ~.*\. (gif|jpg|jpeg|png|bmp|swf|css)$ { root html/test;expires 30d;}[root@nginx nginx-1.12.2]# mkdir /usr/local/nginx/html/test[root@nginx nginx-1.12.2]# cp /abc/11.jpg /usr/local/nginx/html/test/[root@nginx html]# service nginx restart //Restart the service using client tests

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