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Kubespray offline file generator scripts

What's this?

This is offline support scripts for Kubespray offline environment.

This supports:

  • Download offline files.
    • Download Yum/Deb repository files for OS packages.
    • Download all container images used by Kubespray.
    • Download PyPI mirror files for Kubespray.
  • Support scripts for target node.
    • Install containerd from local file.
    • Start up nginx container as web server to supply Yum/Deb repository and PyPI mirror.
    • Start up docker private registry.
    • Load all container images and push them to the private registry.

Requirements

  • RHEL 8 / AlmaLinux 8
  • Ubuntu 20.04 / 22.04

Download offline files

Note: You must execute this process on same OS of k8s target nodes.

Before download offline files, check and edit configurations in config.sh.

If you don't have container runtime (docker or containerd), install it first.

  • To use Docker CE
    • run install-docker.sh to install Docker CE.
  • To use containerd
    • run install-containerd.sh to install containerd and nerdctl.
    • Set docker environment variable to /usr/local/bin/nerdctl in config.sh.

Then, download all files:

$ ./download-all.sh

All artifacts are stored in ./outputs directory.

This script calls all of following scripts.

  • prepare-pkgs.sh
    • Setup python, etc.
  • prepare-py.sh
    • Setup python venv, install required python packages.
  • get-kubespray.sh
    • Download and extract kubespray, if KUBESPRAY_DIR does not exist.
  • pypi-mirror.sh
    • Download PyPI mirror files
  • download-kubespray-files.sh
    • Download kubespray offline files (containers, files, etc)
  • download-additional-containers.sh
    • Download additional containers.
    • You can add any container image repoTag to imagelists/*.txt.
  • create-repo.sh
    • Download RPM or DEB repositories.
  • copy-target-scripts.sh
    • Copy scripts for target node.

Target node support scripts

Copy all contents in outputs directory to target node (which runs ansible). Then run following scripts in outputs directory.

  • setup-container.sh
    • Install containerd from local files.
    • Load nginx and registry images to containerd.
  • start-nginx.sh
    • Start nginx container.
  • setup-offline.sh
    • Setup yum/deb repo config and PyPI mirror config to use local nginx server.
  • setup-py.sh
    • Install python3 and venv from local repo.
  • start-registry.sh
    • Start docker private registry container.
  • load-push-images.sh
    • Load all container images to containerd.
    • Tag and push them to the private registry.
  • extract-kubespray.sh
    • Extract kubespray tarball and apply all patches.

You can configure port number of nginx and private registry in config.sh.

Deploy kubernetes using Kubespray

Install required packages

Create and activate venv:

# Example
$ python3 -m venv ~/.venv/default
$ source ~/.venv/default/bin/activate

Note: For Ubuntu 20.04 and RHEL/CentOS 8, you need to use python 3.9.

# Example
$ python3.9 -m venv ~/.venv/default
$ source ~/.venv/default/bin/activate

Extract kubespray and apply patches:

$ ./extract-kubespray.sh
$ cd kubespray-{version}

For Ubuntu 22.04, you need to install build tools to build some python packages.

$ sudo apt install gcc python3-dev libffi-dev libssl-dev

Install ansible:

$ pip install -U pip                # update pip
$ pip install -r requirements.txt   # Install ansible

Create offline.yml

Copy offline.yml file to your group_vars/all/offline.yml of your inventory directory, and edit it.

You need to change YOUR_HOST with your registry/nginx host IP.

Notes:

  • runc_donwload_url differ from kubespray official document, and must include runc_version.
  • The insecure registries configurations of containerd was changed from kubespray 2.23.0. You need to set containerd_registries_mirrors instead of containerd_insecure_registries.

Deploy offline repo configurations

Deploy offline repo configurations which use your yum_repo/ubuntu_repo to all target nodes using ansible.

First, copy offline setup playbook to kubespray directory.

$ cp -r ${outputs_dir}/playbook ${kubespray_dir}

Then execute offline-repo.yml playbook.

$ cd ${kubespray_dir}
$ ansible-playbook -i ${your_inventory_file} offline-repo.yml

Run kubespray

Run kubespray ansible playbook.

# Example  
$ ansible-playbook -i inventory/mycluster/hosts.yaml  --become --become-user=root cluster.yml