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Chapter 4. Launching non-clustered managed domain

4.1. Launch an Instance to Serve as a Domain Controller
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This topic lists the steps to launch a non-clustered JBoss EAP managed domain on a Red Hat Amazon Machine Image (AMI).

Prerequisite

Launch a Non-Clustered JBoss EAP Instance

Note

You can connect to an EC2 instance through ssh as the ec2-user user. If you need administrative privileges, you can change to root user later. For example, 

$ ssh -l ec2-user ${INSTANCE_PUBLIC_IP}
...
$ sudo su -
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  • Launch the Red Hat AMI instance.

    A non-clustered instance of JBoss EAP has been configured and launched on a Red Hat AMI.

  • To configure JBoss EAP, you can pass arguments to the service directly. Some arguments may not be handled in this way. The location of the service configuration files is:

    • RHEL 6: /etc/sysconfig/eap7-domain
    • RHEL 7: /etc/opt/rh/eap7/wildfly/eap7-domain.conf

See System Paths for more details about system paths.

See Configuring JBoss EAP Subsystems to Work on Cloud Platforms for information about configuring JBoss EAP subsystems for Amazon EC2.

Note
  • For complex configuration, you can either use the domain.conf file in the JBoss EAP bin directory: /opt/rh/eap7/root/usr/share/wildfly/bin/, or you can start the JBoss EAP service and configure the server using the management CLI. The script can be found in the bin directory. Then, reload the configuration.
  • You must regularly run the yum -y update to apply security fixes and enhancements.

  • To start JBoss EAP on RHEL 6, run the following command: 

    $ service eap7-domain start
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    To start JBoss EAP on RHEL 7, run the following command: 

    $ systemctl start eap7-domain
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  • To stop JBoss EAP on RHEL 6, run the following command: 

    $ service eap7-domain stop
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    To stop JBoss EAP on RHEL 7, run the following command: 

    $ systemctl stop eap7-domain
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    Note

    The systemctl command is relevant to only RHEL 7.

Note

If you want to bind JBoss EAP to a different IP address, add the following line in the /etc/opt/rh/eap7/wildfly/eap7-domain.conf file on RHEL 7. The internal IP address is translated into a public IP address by EC2. 

WILDFLY_BIND=$YOUR_PRIVATE_IP_ADDRESS
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4.2. Launch One or More Instances to Serve as Host Controllers
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This topic lists the steps to launch one or more instances of JBoss EAP to serve as non-clustered host controllers on a Red Hat AMI.

Configure and launch the non-clustered domain controller. Refer to Launch an Instance to Serve as a Domain Controller.

See System Paths for more details about system paths.

See Configuring JBoss EAP Subsystems to Work on Cloud Platforms for information about configuring JBoss EAP subsystems for Amazon EC2.

For Domain Controller Instance

For a managed domain running on Amazon EC2, in addition to static domain controller discovery, host controllers can dynamically discover a domain controller using the Amazon Simple Storage (Amazon S3) system. In particular, host controllers and the domain controller can be configured with information needed to access an Amazon S3 bucket.

Using this configuration, when a domain controller is started, it writes its contact information to an S3 file in the bucket. Whenever a host controller attempts to contact the domain controller, it gets the domain controller’s contact information from the S3 file.

For example, it is common for an Amazon EC2 instance’s IP address to change when it is stopped and started. In this scenario, if the domain controller’s contact information changes, the host controllers need not be reconfigured. The host controllers are able to get the domain controller’s new contact information from the S3 file.

See Example User Data for Clustered JBoss EAP Instances for more information about sample script for user data.

The manual domain controller discovery configuration is specified using the following properties:

  • access-key: The Amazon AWS user account access key.
  • secret-access-key: The Amazon AWS user account secret access key.

  • location: The Amazon S3 bucket to be used.

    1. Copy the domain-ec2.xml file from /opt/rh/eap7/root/usr/share/wildfly/docs/examples/configs to the JBoss EAP configuration directory.

    2. Set the following variables in the appropriate service configuration file: 

      WILDFLY_SERVER_CONFIG=domain-ec2.xml
WILDFLY_HOST_CONFIG=host-master.xml
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    3. Add the S3 domain controller discovery configuration to the domain-ec2.xml file: 

      <local>
    <discovery-options>
        <discovery-option name="s3-discovery" module="org.jboss.as.host-controller" code="org.jboss.as.host.controller.discovery.S3Discovery">
            <property name="access-key" value="S3_ACCESS_KEY"/>
            <property name="secret-access-key" value="S3_SECRET_ACCESS_KEY"/>
            <property name="location" value="S3_BUCKET_NAME"/>
        </discovery-option>
    </discovery-options>
</local>
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