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Build_NCN_Images_Locally.md

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Build NCN Images Locally

Build and test NCN images locally by using the following procedure. This procedure can be done on any x86 machine with the following prerequisites.

Necessary software

The listed software below will equip a local machine or build server to build for any medium (.squashfs, .vbox, .qcow2, .iso).

  • media (.iso, .ovf, or .qcow2) (depending on the layer)
  • packer
  • qemu
  • envsubst

Media

packer can intake any ISO, the sections below detail utilized base ISOs in CRAY HPCaaS.

For any ISO, copy it into the iso directory.

SuSE Linux Enterprise

The file name is either:

  • SLE-15-SP2-Full-x86_64-GM-Media1.iso
  • SLE-15-SP3-Full-x86_64-GM-Media1.iso

Repositories

Access is required to the appropriate SLES repositories in the form of official access, self-hosted access, or the provided Nexus access.

To build locally, an administrator must provide their own repositories file and the custom_repos_file variable must be passed with the packer command. The custom_repos_file variable is a filename that is placed into the custom folder of the project. The file must be formatted with the following fields: url name flags

  • -var 'custom_repos_file=custom.repos'

And example entry for a custom repository:

https://myserver.net/sles-mirror/Products/SLE-Module-Basesystem/15-SP3/x86_64/product SUSE-SLE-Module-Basesystem-15-SP3-x86_64-Pool -g -p 99 suse/SLE-Module-Basesystem/15-SP3/x86_64/product

Build steps

  • There are two Providers that can be built; VirtualBox and QEMU
  • VirtualBox is best for local development.
  • QEMU is best for pipeline and portability on Linux machines.
  • Both outputs are capable of creating the kernel, initrd, and SquashFS required to boot nodes.

Setup

  • Install packer from a reputable source, like packer.io.

If building QEMU images in MacOS, then specific QEMU options must be adjusted:

  • MacOS requires HVF for acceleration
  • MacOS uses Cocoa for output
  • -var 'qemu_display=cocoa' -var 'qemu_accelerator=hvf'

Notes

  • Setup environment variables by copying scripts/environment.template to scripts/environment and modifying the values for the specific environment.
  • Ensure that SLE-15-SP3-Full-x86_64-GM-Media1.iso is in the iso/ folder
  • Check out csm-rpms repository and create a symlink to it in the root directory of the project.
  • Execute source scripts/environment
  • Execute ./scripts/setup.sh
  • Render the autoinst template

Quick start

git clone <csm-rpms-repo>
git clone https://github.com/Cray-HPE/node-image-build.git
cd node-image-build
ln -s ../csm-rpms/ csm-rpms
cp scripts/environment.template scripts/environment
vim scripts/environment
source scripts/environment
mkdir -p iso
wget https://<somepath>/SLE-15-SP3-Full-x86_64-GM-Media1.iso -O iso/SLE-15-SP3-Full-x86_64-GM-Media1.iso
./scripts/setup.sh

Base layer

The base layer will install SLES 15 and prepare the image for the installation of Kubernetes and Ceph.

Execute the following commands from the top level of the project

To build with QEMU, run the following command.

  • Run packer build -only=qemu.sles15-base -var 'ssh_password=$SLES15_INITIAL_ROOT_PASSWORD' boxes/sles15-base/

To build with VirtualBox, run the following command.

  • Run packer build -only=virtualbox-iso.sles15-base -var 'ssh_password=$SLES15_INITIAL_ROOT_PASSWORD' boxes/sles15-base/

In order to view the output of the build, disable headless mode:

  • Run packer build -var 'ssh_password=$SLES15_INITIAL_ROOT_PASSWORD' -var 'headless=false' boxes/sles15-base/

Once the images are built, the output will be placed in the output-sles15-base directory in the root of the project.

Common layer

The common layer starts from the output of the base layer. As such the base layer must be created before building common.

To build with QEMU, run the following command.

  • Run packer build -only=qemu.ncn-common -var 'ssh_password=$SLES15_INITIAL_ROOT_PASSWORD' boxes/ncn-common/

To build with VirtualBox, run the following command.

  • Run packer build -only=virtualbox-ovf.ncn-common -var 'ssh_password=$SLES15_INITIAL_ROOT_PASSWORD' boxes/ncn-common/

Once the image is built, the output will be placed in the output-ncn-common directory in the root of the project.

Non-Compute Node image layer

The ncn-node-images stage builds on top of the common layer to create functional images for Kubernetes and Ceph.

To build with QEMU, run the following command.

  • Run packer build -only=qemu.* -var 'ssh_password=$SLES15_INITIAL_ROOT_PASSWORD' boxes/ncn-node-images/

To build with VirtualBox, run the following command.

  • Run packer build -only=virtualbox-ovf.* -var 'ssh_password=$SLES15_INITIAL_ROOT_PASSWORD' boxes/ncn-node-images/

Once the images are built, the output will be placed in the output-sles15-images directory in the root of the project.

Artifacts

Each layer creates a certain set of artifacts that can be used in different ways.

  • Each layer creates a VM disk image that can be directly booted and/or used to create the next layer's image.
  • Each layer after sles15-base creates a list of packages and repos.
  • ncn-common creates kernel and initrd artifacts.
  • ncn-node-images creates kernel, initrd, and SquashFS artifacts.

Versioning

  • The version of the build is passed with the packer build command as the artifact_version var:
packer build -only=qemu.sles15-base -var "artifact_version=`git rev-parse --short HEAD`" -var 'ssh_password=$SLES15_INITIAL_ROOT_PASSWORD' -var 'headless=false' boxes/sles15-base/
  • If no version is passed to the builder then the version none is used when generating the archive.