Chapter 4. Create Hadoop Image

This release supports the following plug-ins:

To create a Hadoop image based on any of these plug-ins, you need to first download a Red Hat Enterprise Linux 7 image. You can get one from the following link (requires a Red Hat subscription):

https://access.redhat.com/downloads/content/69/ver=/rhel---7/7.5/x86_64/product-software

Before preparing the image, configure your system to use your Red Hat subscription details so your system can download the necessary tools for creating a Hadoop image. To do so, enter the following commands from a terminal (as root):

export REG_USER=USERNAME
export REG_PASSWORD=PASSWORD
export REG_POOL_ID=POOLID

# export REG_USER=USERNAME
# export REG_PASSWORD=PASSWORD
# export REG_POOL_ID=POOLID

Where:

subscription-manager list --available

# subscription-manager list --available

This command will display important details about your subscription, including the Pool ID value. The Pool ID should include the Red Hat OpenStack Platform channels.

Install the openstack-sahara-image-pack package on the system:

dnf install openstack-sahara-image-pack -y

# dnf install openstack-sahara-image-pack -y

Configure the Red Hat Enterprise Linux 7 image to use the Red Hat subscription as well. The image should be registered to the following channel:

To do so, run the following command:

dnf install libguestfs-tools -y

# dnf install libguestfs-tools -y

The following commands should be executed as non-root user.

virt-customize -a IMAGE \
    --sm-register \
    --sm-credentials USERNAME:password:_PASSWORD_ \
    --sm-attach pool:_POOLID_ \
    --run-command 'subscription-manager repos --disable=* --enable rhel-7-server-rpms --enable rhel-7-server-optional-rpms'

$ virt-customize -a IMAGE \
    --sm-register \
    --sm-credentials USERNAME:password:_PASSWORD_ \
    --sm-attach pool:_POOLID_ \
    --run-command 'subscription-manager repos --disable=* --enable rhel-7-server-rpms --enable rhel-7-server-optional-rpms'

Where:

To start the customization process, run the following command from the same directory as your Red Hat Enterprise Linux image:

sahara-image-pack --image IMAGE PLUGIN VERSION

$ sahara-image-pack --image IMAGE PLUGIN VERSION

Replace PLUGIN with the plug-in that the Hadoop image should use.

The following values can be used for PLUGIN and VERSION:

The openstack-sahara-image-pack command will modify the specified base image by adding the software required by the plug-in.

Finalize the image by removing the subscription and fixing the SELinux contexts. Run the following command:

virt-customize -a IMAGE --sm-unregister --selinux-relabel

$ virt-customize -a IMAGE --sm-unregister --selinux-relabel