Question
Dell USA L.P.
BR
Last activity: 26 Sep 2018 9:27 EDT
Clustering PEGA 7.4 on Docker
Greetings everyone!
We are following the guide https://community1.pega.com/community/pega-support/question/how-run-pega-74-docker in order to install PEGA on docker running on Tomcat.
Right now it is working when we have one container for the web application and other container for the database(Postgres). The application works, we can login and navigate on the web application.
When we scale the web application for 2 containers, the container web_1 recognizes the container web_2 and forms a cluster with 2 nodes. But after the cluster is formed, i cannot access the web application anymore and after some time one of the containers stops suddently. And if we try to bring a 3rd web container, automatically other web container goes down.
We tried to set the property on the prconfig.xml file on the web containers with the ip of the docker container to see if this can help, but we still have the same problems:
<env name="identification/cluster/public/address" value="<ip of the container>" />
Here is our docker-compose file to bring up the application:
Greetings everyone!
We are following the guide https://community1.pega.com/community/pega-support/question/how-run-pega-74-docker in order to install PEGA on docker running on Tomcat.
Right now it is working when we have one container for the web application and other container for the database(Postgres). The application works, we can login and navigate on the web application.
When we scale the web application for 2 containers, the container web_1 recognizes the container web_2 and forms a cluster with 2 nodes. But after the cluster is formed, i cannot access the web application anymore and after some time one of the containers stops suddently. And if we try to bring a 3rd web container, automatically other web container goes down.
We tried to set the property on the prconfig.xml file on the web containers with the ip of the docker container to see if this can help, but we still have the same problems:
<env name="identification/cluster/public/address" value="<ip of the container>" />
Here is our docker-compose file to bring up the application:
version: '3'
services:
postgres:
image: "pega74db_baseline"
ports:
- "5432:5432"
environment:
- POSTGRES_USER=pega
- POSTGRES_PASSWORD=pegasys
web:
image: "pega7-tomcat"
ports:
- "5701"
- "5702"
- "5703"
- "5704"
- "5705"
- "5706"
- "5707"
- "5708"
- "5709"
- "5710"
- "8080"
- "8090"
- "9001"
- "47100"
depends_on:
- postgres
environment:
- DB_HOST=pega7dockerimagebuild_postgres_1
We exposed the ports 5701-5710 because the hazelcast use them to comunicates with the other nodes. One curious thing is, when we have the cluster formed with 2 modes, we can see on the logs the property "mode" on the json which represents the cluster, and for both nodes this property has the value "SERVER", is this correct?
We was wondering one node should be the "SERVER" and the other should be something else.
By the way, we saw the disclaimer warning about the image of PEGA 7.4 with tomcat on docker is not ready for run in cluster. There is any image which is ready to run in cluster? There is any guide which shows how to install and configure the PEGA application to run in cluster mode?
"Disclaimer: The image has not been configured to support production system and would not work as-is in a cluster environment. In production, there are many factors to consider when using docker for keeping permanent data safely, especially in swarm mode, or in clusters."
Thanks in advance,
Victor Mota
Pegasystems Inc.
PL
Hi Victor,
Could you please let me know f you are trying to run two docker images on one machine? It sounds like problem with network. I will try to run some tests today and will let you know about results.
Dell USA L.P.
BR
Hello Jakub, how are you?!
Answering your question, yes! We are trying to run 2 docker containers with the images of PEGA 7.4 with Tomcat on the same machine. If you are able to do that, can you please provide the steps taken to reach this setup?
The reason that we are doing this test is to use PEGA 7.4 in a PKS with PCF. We believe when PEGA will run on that environment, 2 PEGA containers could be run in a same machine, or this will not happen?
Thanks for the answer,
Victor Mota
Pegasystems Inc.
PL
By the way, we saw the disclaimer warning about the image of PEGA 7.4 with tomcat on docker is not ready for run in cluster. There is any image which is ready to run in cluster? There is any guide which shows how to install and configure the PEGA application to run in cluster mode?
This is basic installation in order to make some development on local environment or test features. At this moment I am not aware of any other guide that can help you install pega on premise in cluster mode. Most of the Customers are using Pega Cloud that provides environment in a cluster mode. For example Pega software is working on several instances in Pega Cloud and each instance is responsible for something different like Util instance take care of all indexes and background processing, where Web instance is responsible for serving traffic between client and server side.
Centene
US
Any luck or any documentation on how to run the containers on same node or a different node? We have hosted it in 2 different docker servers and they were not able to communicate with each other. Unless we restart the containers, the node is not reflecting the latest code :( and search is also not working).
Ford Motor Company
US
VictorM4057, you indicated that you run the one container it works? I followed the same doc but could not make the login page work, can you share your info or answer my question on that post and see if you encountered the same issue?
Dell USA L.P.
BR
Hello LittleLingzi,
The problem for login is wrong password? Or you cannot event reach the login screen? If you follow the tutorial posted on the comment below you should be fine to run one container with pega and another container with the DB.
But if you want to scale your PEGA container, you have to tweak a lot of configuration. BTW i just figured out that image which PEGA gave to us, only run on postgres DB, so if you have another dabase, you need to create your own image.
CollabPartnerz
IN
Below link might help you
https://collaborate.pega.com/community-post-unpublished-or-under-review