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Chapter 28. Red Hat Process Automation Manager clusters in a development (authoring) environment

Developers can use Red Hat Process Automation Manager to author rules and processes that assist users with decision making.

You can configure Red Hat Process Automation Manager as a clustered development environment to benefit from high availability. With a clustered environment, if a developer is working on a node and that node fails, that developer’s work is preserved and visible on any other node of the cluster.

Most development environments consist of Business Central for creating rules and processes. and at least one KIE Server to test those rules and processes .

To create a Red Hat Process Automation Manager clustered development environment, you must perform the following tasks:

  1. Configure the following components on each system that will be a node of the cluster:

    • Configure Red Hat JBoss EAP 7.3 with Red Hat Data Grid 7.3.

      Red Hat Data Grid is built from the Infinispan open-source software project. It is a distributed in-memory key/value data store that has indexing capabilities that enable you to store, search, and analyze high volumes of data quickly and in near-real time. In a Red Hat Process Automation Manager clustered environment, it enables you to perform complex and efficient searches across cluster nodes.

    • Configure AMQ Broker, a Java messaging server (JMS) broker.

      A JMS broker is a software component that receives messages, stores them locally, and forwards the messages to a recipient. AMQ Broker enables your applications to communicate with any messaging provider. It specifies how components such as message-driven beans, Enterprise JavaBeans, and servlets can send or receive messages.

    • Configure an NFS file server.
  2. Download Red Hat JBoss EAP 7.3 and Red Hat Process Automation Manager 7.11, and then install them on each system that will be a cluster node.
  3. Configure and start Business Central on each node of the cluster.

28.1. Installing and configuring Red Hat Data Grid

For more efficient searching across cluster nodes, install Red Hat Data Grid and configure it for the Red Hat Process Automation Manager clustered environment.

For information about Red Hat Data Grid advanced installation and configuration options and Red Hat Data Grid modules for Red Hat JBoss EAP, see the Red Hat Data Grid User Guide.

Note

Do not install Red Hat Data Grid on the same node as Business Central.

Prerequisites

  • A Java Virtual Machine (JVM) environment compatible with Java 8.0 or later is installed.

Procedure

  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: Data Grid
    • Version: 7.3
  2. Download and extract the Red Hat JBoss Data Grid 7.3.0 Server (jboss-datagrid-7.3.0-1-server.zip) installation file to the preferred location on your system. In the following examples, the extracted directory is referred to as JDG_HOME.
  3. Update Red Hat Data Grid to the latest version. For more information, see Red Hat Data Grid Red Hat Data Grid User Guide.
  4. To run Red Hat Data Grid, navigate to JDG_HOME/bin and enter the following command:

    $ ./standalone.sh -c clustered.xml -b <HOST>

    Replace <HOST> with the IP address or host name of the server where you installed Red Hat Data Grid.

28.2. Downloading and configuring AMQ Broker

Red Hat AMQ Broker enables your applications to communicate with any messaging provider. It specifies how components such as message-driven beans, Enterprise JavaBeans, and servlets can send or receive messages.

For information about advanced installations and configuration options, see Getting started with AMQ Broker.

Procedure

  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: AMQ Broker
    • Version: 7.8.1
  2. Click Download next to Red Hat AMQ Broker 7.8.1 (amq-broker-7.8.1-bin.zip).
  3. Extract the amq-broker-7.8.1-bin.zip file.
  4. Change directory to amq-broker-7.8.1-bin/amq-broker-7.8.1/bin.
  5. Enter the following command to create the broker and broker user:

    ./artemis create --host <HOST> --user <AMQ_USER> --password <AMQ_PASSWORD> --require-login <BROKER_NAME>

    In this example, replace the following placeholders:

    • <HOST> is the IP address or host name of the server where you installed AMQ Broker.
    • <AMQ_USER> and <AMQ_PASSWORD> is a user name and password combination of your choice.
    • <BROKER_NAME> is a name for the broker that you are creating.
  6. To run AMQ Broker, navigate to the amq-broker-7.8.1-bin/amq-broker-7.8.1/bin directory and enter the following command:

    <BROKER_NAME>/bin/artemis run

28.3. Configuring an NFS version 4 server

An NFS version 4 server with a shared file system is required for a Business Central clustered environment and each client node must have access to the shared file system.

Procedure

  1. Configure a server to export NFS version 4 shares. For instructions about exporting NFS shares on Red Hat Enterprise Linux, see Exporting NFS shares in Managing file systems. For more information about creating the NFS server, see How to configure NFS in RHEL 7.
  2. On the server, open the /etc/exports file in a text editor.
  3. Add the following line to the /etc/exports file where <HOST_LIST> is a space-separated list of IP addresses and options of hosts that are authorized to connect to the server:

    /opt/kie/data <HOST_LIST>

    For example:

    /opt/kie/data 192.268.1.0/24(rw,sync) 192.268.1.1/24(no_root_squash)

    This creates an /opt/kie/data share with the rw,sync,no_root_squash minimum options that are required for NFS.

    Note

    You can use a different share name instead of /opt/kie/data. If you do, you must use the different name when configuring all nodes that run Business Central.

28.4. Downloading and extracting Red Hat JBoss EAP 7.3 and Red Hat Process Automation Manager

Download and install Red Hat JBoss EAP 7.3 and Red Hat Process Automation Manager 7.11 on each node of the cluster.

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: Enterprise Application Platform
      • Version: 7.3
    2. Click Download next to Red Hat JBoss Enterprise Application Platform 7.3.0. (JBEAP-7.3.0/jboss-eap-7.3.0.zip).
  2. Extract the jboss-eap-7.3.0.zip file. In the following steps, EAP_HOME is the jboss-eap-7.3/jboss-eap-7.3 directory.
  3. Download and apply the latest Red Hat JBoss EAP patch, if available.
  4. Download Red Hat Process Automation Manager on each node of the cluster:

    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: Process Automation Manager
      • Version: 7.11
    2. Download Red Hat Process Automation Manager 7.11.0 Business Central Deployable for Red Hat JBoss EAP 7 (rhpam-7.11.0-business-central-eap7-deployable.zip).
  5. Extract the rhpam-7.11.0-business-central-eap7-deployable.zip file to a temporary directory. In the following commands this directory is called TEMP_DIR.
  6. Copy the contents of TEMP_DIR/rhpam-7.11.0-business-central-eap7-deployable/jboss-eap-7.3 to EAP_HOME.
  7. Download and apply the latest Red Hat Process Automation Manager patch, if available.
  8. Configure Red Hat Single Sign-On for your high availability environment. For more information, see Integrating Red Hat Process Automation Manager with Red Hat Single Sign-On and the Red Hat Single Sign-On Server Administration Guide.

28.5. Configuring and running Business Central in a cluster

After you install Red Hat JBoss EAP and Business Central you can use Red Hat Data Grid and the AMQ Broker to configure the cluster. Complete these steps on each node of the cluster.

Note

These steps describe a basic cluster configuration. For more complex configurations, see the Red Hat JBoss EAP 7.3 Configuration Guide.

Note

Do not connect KIE Server to Business Central in high availability (HA) on premise environments.

Business Central instances are not able to keep in sync with the status of each KIE Server. For example, if a KIE Server is up but not in sync, Business Central will not be able to deploy through that instance.

Prerequisites

Procedure

  1. To mount the directory shared over NFS as /data, enter the following commands as the root user:

    mkdir /data
    mount <NFS_SERVER_IP>:<DATA_SHARE> /data

    Replace <NFS_SERVER_IP> with the IP address or hostname of the NFS server system. Replace <DATA_SHARE> with the share name that you configured (for example, /opt/kie/data).

  2. Create a kie-wb-playground directory in the /data NFS directory:

    mkdir /kie-wb-playground
  3. Create a kie-wb-playground directory in the EAP_HOME/bin directory and mount the directory:

    mount -o rw,sync,actimeo=1 <NFS_SERVER_IP>:<DATA_SHARE>/kie-wb-playground kie-wb-playground
  4. Open the EAP_HOME/standalone/configuration/standalone-full.xml file in a text editor.
  5. Edit or add the properties under the <system-properties> element and replace the following placeholders:

    • <AMQ_USER> and <AMQ_PASSWORD> are the credentials that you defined when creating the AMQ Broker.
    • <AMQ_BROKER_IP_ADDRESS> is the IP address of the AMQ Broker.
    • <DATA_GRID_NODE_IP> is the IP address where Red Hat Data Grid is installed.

      <system-properties>
        <property name="appformer-jms-connection-mode" value="REMOTE"/>
        <property name="appformer-jms-username" value="<AMQ_USER>"/>
        <property name="appformer-jms-password" value="<AMQ_USER_PASSWORD>"/>
        <property name="appformer-jms-url"
           value="tcp://<AMQ_BROKER_IP_ADDRESS>:61616?ha=true&amp;retryInterval=1000&amp;retryIntervalMultiplier=1.0&amp;reconnectAttempts=-1"/>
        <property name="org.appformer.ext.metadata.infinispan.port"
           value="11222"/>
        <property name="org.appformer.ext.metadata.infinispan.host"
           value="<DATA_GRID_NODE_IP>"/>
        <property name="org.appformer.ext.metadata.infinispan.realm"
           value="ApplicationRealm"/>
        <property name="org.appformer.ext.metadata.infinispan.cluster"
           value="kie-cluster"/>
        <property name="org.appformer.ext.metadata.index"
           value="infinispan"/>
        <property name="org.uberfire.nio.git.dir"
           value="/data"/>
        <property name="es.set.netty.runtime.available.processors"
           value="false"/>
      </system-properties>
  6. Optional: If the Red Hat Data Grid deployment requires authentication, edit or add the properties under the <system-properties> element and replace the following placeholders:

    • <SERVER_NAME> is the server name specified in your Red Hat Data Grid server configuration.
    • <SASL_QOP> is the combination of auth, auth-int and auth-conf values for your Red Hat Data Grid server configuration.

      <property name="org.appformer.ext.metadata.infinispan.server.name"
         value="<SERVER_NAME>"/>
      <property name="org.appformer.ext.metadata.infinispan.sasl.qop"
         value="<SASL_QOP>"/>
      <property name="org.appformer.ext.metadata.infinispan.username"
         value=""/>
      <property name="org.appformer.ext.metadata.infinispan.password"
         value=""/>
  7. Save the standalone-full.xml file.
  8. To start the cluster, navigate to EAP_HOME/bin and enter the following command:

    $ ./standalone.sh -c standalone-full.xml -b <HOST>

    Replace <HOST> with the IP address or host name of the server where you installed Red Hat Process Automation Manager.

28.6. Testing your high availability (HA) on-premise infrastructure

When you create a production-ready high availability (HA) on-premises infrastructure for Business Central, you must ensure that it meets the minimum hardware and performance requirements for a viable HA environment. An HA on-premise infrastructure consists of the following four main components: Business Central, the message system (AMQ), the indexing server (Red Hat Data Grid), and a shared file system (NFS/GlusterFS/Ceph).

Prerequisites

  • A network environment of at least 3 nodes is configured with the following layout:

    Node 1: Business Central

    Node 2: Business Central

    Node 3: AMQ, Red Hat Data Grid, and NFS

Procedure

  1. Test the network speed:

    1. In the command terminal of each server node, install iPerf3:

      $ dnf install iperf3
    2. In the command terminal of the NFS server node (server node 3), start iPerf3 in server mode:

      $ iperf3 -s
    3. In the command terminal of each Business Central server node, enter the following command to start iPerf3 in client mode with the NFS server node set as the host:

      $ iperf3 -c <NFS_SERVER_IP>
      +
      In this example, replace `<NFS_SERVER_IP>` with the IP address of the NFS server.
    4. Compare the results from each server node with the following example of minimum values:

      iperf3 -c 172.31.47.103
      Connecting to host 172.31.47.103, port 5201
      [  5] local 172.31.39.4 port 44820 connected to 172.31.47.103 port 5201
      [ ID] Interval           Transfer     Bitrate         Retr  Cwnd
      [  5]   0.00-1.00   sec   143 MBytes  1.20 Gbits/sec    0    419 KBytes
      [  5]   1.00-2.00   sec   111 MBytes   928 Mbits/sec    6    848 KBytes
      [  5]   2.00-3.00   sec  53.8 MBytes   451 Mbits/sec    0   1.08 MBytes
      [  5]   3.00-4.00   sec  52.5 MBytes   440 Mbits/sec    1   1022 KBytes
      [  5]   4.00-5.00   sec  53.8 MBytes   451 Mbits/sec    1    935 KBytes
      [  5]   5.00-6.00   sec  53.8 MBytes   451 Mbits/sec    1    848 KBytes
      [  5]   6.00-7.00   sec  52.5 MBytes   440 Mbits/sec    0   1.08 MBytes
      [  5]   7.00-8.00   sec  53.8 MBytes   451 Mbits/sec    1   1.01 MBytes
      [  5]   8.00-9.00   sec  53.8 MBytes   451 Mbits/sec    1    953 KBytes
      [  5]   9.00-10.00  sec  52.5 MBytes   440 Mbits/sec    1    856 KBytes
      - - - - - - - - - - - - - - - - - - - - - - - - -
      [ ID] Interval           Transfer     Bitrate         Retr
      [  5]   0.00-10.00  sec   680 MBytes   570 Mbits/sec   12             sender
      [  5]   0.00-10.04  sec   677 MBytes   566 Mbits/sec                  receiver
      
      iperf Done.
  2. Verify the NFS information:

    1. In the command terminal of each Business Central server node, mount the NFS node:

      $ mount -o actimeo=1 <NFS_SERVER_IP>:/opt/nfs/kie /opt/kie/niogit
    2. In the command terminal of each mounted node, enter nfsiostat:

      $ nfsiostat
    3. Compare the results from each server node with the following example of minimum values:

      nfsiostat
      ops/s	rpc bklog
      6.415	0.000
      
      read:
      ops/s	kB/s	kB/op	retrans	avg RTT (ms)	avg exe (ms)	avg queue (ms)	errors
      0.031	0.045	1.452	0 (0.0%)	0.129		0.166		0.019		0 (0.0%)
      
      write:
      ops/s	kB/s	kB/op	retrans	avg RTT (ms)	avg exe (ms)	avg queue (ms)	errors
      0.517	0.467	0.903	0 (0.0%)	1.235		1.269		0.01 8		0 (0.0%)
  3. Verify that the disk is an SSD:

    1. In the command terminal of the NFS server, enter df -h to identify the disk as shown in the following example:

      $ df -h
      Filesystem               Size  Used Avail Use% Mounted on
      devtmpfs                 3.8G     0  3.8G   0% /dev
      tmpfs                    3.9G     0  3.9G   0% /dev/shm
      tmpfs                    3.9G   33M  3.8G   1% /run
      tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
      /dev/xvda2                25G  3.2G   22G  13% /
      tmpfs                    781M     0  781M   0% /run/user/1000
      172.31.47.103:/root/nfs   25G  2.1G   23G   9% /root/nfs
    2. Enter lsblk -d to verify that the disk is an SSD:

      $ lsblk -d
    3. Enter hdparm -Tt to test the disk:

      $ hdparm -Tt /dev/xvda2
    4. Compare the results from each server node with the following example of minimum values:

      $ hdparm -Tt /dev/xvda2
      
      /dev/xvda2:
       Timing cached reads:   18670 MB in  1.99 seconds = 9389.01 MB/sec
       Timing buffered disk reads: 216 MB in  3.03 seconds =  71.40 MB/sec

28.7. Verifying the Red Hat Process Automation Manager cluster

After configuring the cluster for Red Hat Process Automation Manager, create an asset to verify that the installation is working.

Procedure

  1. In a web browser, enter <node-IP-address>:8080/business-central. Replace <node-IP-address> with the IP address of a particular node.
  2. Enter the admin user credentials that you created during installation. The Business Central home page appears.
  3. Select MenuDesignProjects.
  4. Open the MySpace space.
  5. Click Try SamplesMortgagesOK. The Assets window appears.
  6. Click Add AssetData Object.
  7. Enter MyDataObject in the Data Object field and click OK.
  8. Click SpacesMySpaceMortgages and confirm that MyDataObject is in the list of assets.
  9. Enter the following URL in a web browser, where <node_IP_address> is the address of a different node of the cluster:

    http://<node_IP_address>:8080/business-central

  10. Enter the same credentials that you used to log in to Business Central on the first node, where you created the MyDataObject asset.
  11. Select MenuDesignProjects.
  12. Open the MySpace space.
  13. Select the Mortgages project.
  14. Verify that MyDataObject is in the asset list.
  15. Delete the Mortgages project.