Shulou(Shulou.com)06/03 Report--

Load balancing (Cloud Load Balancer) is a service that distributes traffic to multiple CVMs. Load balancing can expand the external service capacity of the application system through traffic distribution and improve the availability of the application system by eliminating a single point of failure. The cloud load balancer service virtualizes multiple CVM resources located in the same region into a high-performance and highly available application service pool by setting virtual service addresses (VIP). Distribute the network requests from the client to the cloud server pool according to the way specified by the application. The load balancer service checks the health status of the CVM instances in the CVM pool and automatically isolates the abnormal instances, thus solving the single point problem of the CVM and improving the overall service capability of the application. Today, I will introduce to you what the environment of load balancing is like.

Create a new virtual machine and install CentOS. CentOS-6.4-i386-bin-DVD1.iso is used here. Note that it is 32-bit.

Please check the connection: https://blog.51cto.com/11009785/2288310

1. Set up the basic linux environment

Please check the connection: https://blog.51cto.com/11009785/2388623

two。 Install jdk (java1.7 used here)

Download address: https://www.oracle.com/technetwork/java/javase/archive-139210.html

The version of jdk-7u60-linux-i586.rpm is used

After downloading the rpm package, upload it to CentOS through xshell and using the rz command

Give full permissions first:

Chmod 777 jdk-7u60-linux-i586.rpm

Reinstall:

Rpm-ivh jdk-7u60-linux-i586.rpm

After installation, configure the environment variables:

Vi / etc/profile

Add at the end:

Export JAVA_HOME=/usr/java/jdk1.7.0_60

Export CLASSPATH=.:$JAVA_HOME/lib

Export PATH=$JAVA_HOME/bin:$PATH

Save Fil

Reload the environment variables:

Source / etc/profile

Verify that the installation was successful:

Java-version

3. Install nginx

Download nginx-1.9.1.tar.gz and upload it to CentOS via xshell using the rz command

Decompress:

Tar-zxvpf nginx-1.9.1.tar.gz

Enter the nginx directory and execute the following command:

. / configure-- prefix=/opt/nginx-- with-http_stub_status_module-- with-http_ssl_module-- with-threads-- with-pcre= here write the path after pcre-8.37 decompression

Make

Make install

Verify:

/ opt/nginx/sbin/nginx-t

Start:

/ opt/nginx/sbin/nginx

Check to see if it starts:

Ps-ef | grep nginx

Visit ip and the welcome page appears

If you need to restart, use:

/ opt/nginx/sbin/nginx-s reload

Ps-ef | grep nginx

4. Install tomcat

Download apache-tomcat-7.0.62.tar.gz and upload it to CentOS via xshell using the rz command

Decompress:

Tar-zxvpf apache-tomcat-7.0.62.tar.gz

After decompression, rename it to tomcat1

Mv apache-tomcat-7.0.62 tomcat1

Extract it again and rename it to tomcat2

Mv apache-tomcat-7.0.62 tomcat2

Put tomcat1 and tomcat2 in the / opt directory

Mv tomcat1 / opt

Mv tomcat2 / opt

There are three main ports:

Shutdown port 8005 is mainly responsible for starting and shutting down

Ajp port 8009 is mainly responsible for balancing through ajp

Http port 8080 can be accessed directly through the web page

If the three ports of tomcat1 are 8005 8009 8080 respectively

Then the three ports of tomcat2 are all added 1000 on this basis, that is, 9005 9009 9080

View the port of tomcat1:

Cd / opt/tomcat1/conf

Vi server.xml

/ 8005 found 8005 (one place), / 8009 found 8009 (two places), / 8080 found 8080 (three places)

Modify the port of tomcat2:

Cd / opt/tomcat2/conf

Vi server.xml

/ 8005 found 8005 (one place), modified to 9005

/ 8009 found 8009 (in two places), modified to 9009

/ 8080 found 8080 (in three places), modified to 9080

To distinguish between tomcat1 and tomcat2, modify their home page index.jsp respectively:

Cd / opt/tomcat1/webapps/ROOT

Vi index.jsp

/ Home find the location of Home, change it to Home111111, and save it

Cd / opt/tomcat2/webapps/ROOT

Vi index.jsp

/ Home find the location of Home, change it to Home222222, and save it

Start tomcat1:

Cd / opt/tomcat1/bin

Sh startup.sh

Check to see if it starts:

Ps-ef | grep catalina

View the log:

Cd opt/tomcat1/logs

Tail-f catalina.out

In the same way, start tomcat2

Check to see if both tomcat are started:

Ps-ef | grep catalina

Verify and access the corresponding port:

Http://192.168.0.103:8080 corresponds to tomcat1

Http://192.168.0.103:9080 corresponds to tomcat2

5. Integrate nginx+tomcat

Modify the nginx configuration file:

Cd / opt/nginx/conf

Vi nginx.conf

Note that the names should be unified, for example, they are all called web_app here.

After modification, save.

Restart nginx:

/ opt/nginx/sbin/nginx-s reload

Among them, proxy_pass is a homecoming Dai Li with engx.

Verify:

If you directly access the virtual machine ip, refresh it with F5 or use Ctrl+F5 strong brush, you will see that you have visited different tomcat

Note that if there is a problem, check the nginx log and see the specific error report to solve it.

Finally, attach a picture to see the position of nginx and tomcat in the architecture

If there is anything else you need to know, you can find our professional technical engineer on the official website. The technical engineer has more than ten years of experience in the industry, so it will be more detailed and professional than the editor's answer. Official website link www.yisu.com

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