第3章 KIE Server clusters in a runtime environment

The primary benefit of clustering a KIE Server runtime environment is load balancing. If activity on one node of the cluster increases, that activity can be shared among the other nodes of the cluster to improve performance.

To create a KIE Server clustered runtime environment, you download and extract Red Hat JBoss EAP 7.3 and KIE Server. Then, you configure Red Hat JBoss EAP 7.3 for a cluster, start the cluster, and install KIE Server on each cluster node.

Optionally, you can then cluster the headless Decision Manager controller.

3.1. Downloading and extracting Red Hat JBoss EAP 7.3 and KIE Server

Complete the steps in this section to download and install Red Hat JBoss EAP 7.3 and KIE Server for installation in a clustered environment.

Procedure

  1. Download Red Hat JBoss EAP 7.3 on each node of the cluster:

    1. Navigate to the Software Downloads page in the Red Hat Customer Portal (login required) and select the product and version from the drop-down options:

      • Product: Red Hat JBoss EAP
      • Version: 7.3
    2. Click Download next to Red Hat JBoss Enterprise Application Platform 7.3.0. (jboss-eap-7.3.0.zip).
  2. Extract the jboss-eap-7.3.0.zip file. The jboss-eap-7.3/jboss-eap-7.3 directory is referred to as EAP_HOME.
  3. Download and apply the latest Red Hat JBoss EAP patch, if available.

  4. Download KIE Server:

    1. Navigate to the Software Downloads page in the Red Hat Customer Portal and select the product and version from the drop-down options:

      • Product: Decision Manager
      • Version: 7.8
    2. Download Red Hat Decision Manager 7.8.0 KIE Server for All Supported EE8 Containers (rhdm-7.8.0-kie-server-ee8.zip).
  5. Extract the rhdm-7.8.0-kie-server-ee8.zip archive to a temporary directory. In the following examples this directory is called TEMP_DIR.

  6. Copy the TEMP_DIR/rhdm-7.8.0-kie-server-ee8/rhdm-7.8.0-kie-server-ee8/kie-server.war directory to EAP_HOME/standalone/deployments/.

    警告

    Ensure the names of the Red Hat Decision Manager deployments you copy do not conflict with your existing deployments in the Red Hat JBoss EAP instance.

  7. Copy the contents of the TEMP_DIR/rhdm-7.8.0-kie-server-ee8/rhdm-7.8.0-kie-server-ee8/SecurityPolicy/ to EAP_HOME/bin. When asked to overwrite files, click Replace.
  8. In the EAP_HOME/standalone/deployments/ directory, create an empty file named kie-server.war.dodeploy. This file ensures that KIE Server is automatically deployed when the server starts.
  9. Download and apply the latest Red Hat Decision Manager patch, if available.
  10. Navigate to the EAP_HOME/bin directory.

  11. Create a user with the kie-server role that you will use to log in to KIE Server. 

    $ ./add-user.sh -a --user <USERNAME>  --password <PASSWORD> --role kie-server
  12. Make a note of your user names and passwords.

  13. To start the cluster, navigate to EAP_HOME/bin and enter one of the following commands:

    • On Linux or UNIX-based systems: 

      $ ./standalone.sh -c standalone-full.xml

    • On Windows: 

      standalone.bat -c standalone-full.xml