Tomcat Clustering Series Part 1 : Simple Load Balancer
HTML-код
- Опубликовано: 8 фев 2025
- I am going to start new series of posts about Tomcat clustering. In this first post we will see what is problem in normal deployment in only single machine, what is clustering and why is necessary and how to setup the simple load balancer with Apache httpd web server + Tomcat server cluster.
Visit : www.ramkitech.c...
Subscribe
www.youtube.com...
Website
www.ramkitech.com
Ramki on Twitter
/ ramkicse
Excellent presentation, great tutorial and explanation. Thank you for posting these tutorials.
Thanks Rama Krishnnan. Its really nice & quick refresh of basics.
Thanks :-)
Excellent tutorials have brought me a lot of trouble!
Man, you are awesome. Real practical example.
Thanks :-)
its too nice Rama krishna.
Too much helpful. thanks.
Nice info in simple manner. Rocking !!!
thanks :-)
Thanks for the Video and blog Rama - great work :)
+venu thangalapally Thanks :-)
Rama - were u able to test session replication on tomcat version 8 ?
+venu thangalapally yes
Are you providing training on Tomcat?
Thanks a lot Rama , but my case that I've JSF 2 web app and I follow the steps that mentioned in the video and the balancer successfully redirect to each tomcat instance but to empty page
Thanks
Could you make an updated version videos please.. On tomcat and clustering
good demo. thank you.
- Santosh Marigowda
thanks. it save my time.
Thanks a TON!! The Great piece of work
So from the network perspective . The http server is connected to internet and the application server is only accessible locally .The http server access the application server content and load it to the user . Is that right or all is accessible via internet ?
DEGFSDFGS Yes thats correct.
Hi Ramkrisha,
I have configured tomcat Cluster as per your document all are working fine. But our product is Saas product we we usually access it with a link address 50.16.49.58:7080/dbsync2/login.m (this is the server with i config cluster). if i do access like this means it will not go through the LB. Here is the problem 50.16.49.58/dbsync2/login.m when am using this line am getting error like URL is not found.
How can i resolve this issue.... ?
Thanks for the Video.
Hi Ramakrishna, I have a requirement where in I need to forward requerest based on user locale to different clusters. How to write that logic in apache load balancer.
How its possible to configure private JVM in existing tomcat server
thanks deepak.
Thanks Santosh
It is good to have failover and load balancing. Imagine you have 5 tomcat instances for load balancing and you want to make an update . can we put the content of the app server in a shared storage ? So that it makes it easy to update ?
DEGFSDFGS yes but its not recommended way because it updating all servers that time undeploy old one deploy new one. that time some moment service unavailable situation happen.
Rama krishnnan EP Thank you for your good explanation. I heard that Glassfish has the load balancing and failover already preconfigured . If you have time it may be good to hava walk through
i think its not. oracle use their product to use load balancing. Glashfish don't have internally. Domain controller is just managing purpose and like tomcat the make cluster. but we need to put load balancer in front of them
Hello Ramki Sir, I have an issue my apache server is on high load got hang after some interval Please suggest how resolve it
Hi Rama nice to meet you. Very very nice explain for this work. We had several years worked with apache + tomcat. I am look your new explain with nginX as load balancer. Did you use other non open source applications server like IBM webphere or Glasshfish for comparing with tomcat working in cluster?
Thanks in advance
+Gustavo Pérez no. i mostly used tomcat only
Ha okey very nice tutorials and clear all of yours. I very impressive, I'm working in a public clinical hospital in Uruguay with very little or nothing of money at all. Tomcat + Java combination helped us for develop many application but when we began worked in a cluster enviroment we were experimented a few lost of velocity with some of these applications.
Thanks for share your experience
Gustavo Pérez
Thanks ☺
In theory, is it ok if there are just one worker, or I have to configure with at least 2 instances?
I know that it's is useless if there is just 1 instance.
quan nguyen even u can put one worker also, but of course its not a cluster, and u don't have cluster so no high availability and scalable then why need? the purpose is ur tomcat running on port 8080 an ur httpd running on port 80. so outside world access ur tomcat on port 80 only. here ur httpd server act as reverse proxy for ur tomcat.
Tks for your answer.
I'm still confusing about the balancer.
If all requests have to be executed by the balancer first, and then they will be redirected to Tomcat instance. So if the amount of requests is extremely great, can the balancer be overload and if it happend how to deal with it or just preventing this case happend?
quan nguyen Load balancer is just like delegator. its forwards to tomcat instance, where actual process are happened. some time load balancer are also exhausted. so we need to put more than one load balancers and each one need to configure all tomcat instances. so any load balancer get the request its forward the proper tomcat instance.
here each load balancer ger public IP and add to DNS recoreds.
check nslookup www.google.com u will get all LB IP address.
Is it possible if I use Tomcat load balancer with a web service?
I need to use load balancer and combine it with my web service. But my WS is SoapWS so I don't know how to configure the load balancer. :-(
Please suggest how to insall mod_jk file using apache web server
So in this example what is the diffrence if i use Windows server network load balancing ?
DEGFSDFGS I think almost same feature.
Hello Kiran, sorry for late reply. i not aware in comment.
ok what is this IP address 50.16.49.58? Is it Load balancer? and Is load balancer is running on port 7080?
Thanks for sharing video, but i am not able to configure bcz in this tutorial you not shown httpd.conf file.
In you previous video Virtual Host + apace httpd+tomcat+modJk we had 3 different sites that are hosting on three different but in this I think we have host 1 sites in all the tomcat using round-robin. Pls share server.xml and httpd.conf file.
Nice video!
Hi would like to know about San storage and storage part also AIX based commands and it's functions
It will be helpful if u will make videos on server upgradation of aix and also Linux
What happens if one server fails ? The requests will be distributed on 2 servers or 3 servers ?
DEGFSDFGS yes its forward to any server. all are holding the sessions so the can continue to process
Rama krishnnan EP so out of 3 server 1 is down and request are still forwarded to this server . Then there is problem i think ?
DEGFSDFGS If Server 1 is down then its forwards to remaining servers(server2 and 3). whenever server 1is up then it also get request
very nice, thanks.
Thanks Bhaskar :-)
Looking forward for more tuts :)
Please post all things which needs to know by the admin including scripts
Thanks
sure anish :-)
hi ur site is not working
Video has great info, but having a very difficult time understanding you. English subtitles would be helpful.
Hello Gaurav Rishi,
my site is working
ramkitech(dot)com
I can't understand you guy.. sorry
what happened?
any issues?
Rama krishnnan EP you should put subtitles down there, it would be very helpful :)