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offline-environment.md

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Offline environment

In case your servers don't have access to internet (for example when deploying on premises with security constraints), you need to setup:

  • a HTTP reverse proxy/cache/mirror to serve some static files (zips and binaries)
  • an internal Yum/Deb repository for OS packages
  • an internal container image registry that need to be populated with all container images used by Kubespray. Exhaustive list depends on your setup
  • [Optional] an internal PyPi server for kubespray python packages (only required if your OS doesn't provide all python packages/versions listed in requirements.txt)
  • [Optional] an internal Helm registry (only required if helm_enabled=true)

Configure Inventory

Once all artifacts are accessible from your internal network, adjust the following variables in your inventory to match your environment:

# Registry overrides
kube_image_repo: "{{ registry_host }}"
gcr_image_repo: "{{ registry_host }}"
docker_image_repo: "{{ registry_host }}"
quay_image_repo: "{{ registry_host }}"

kubeadm_download_url: "{{ files_repo }}/kubernetes/{{ kube_version }}/kubeadm"
kubectl_download_url: "{{ files_repo }}/kubernetes/{{ kube_version }}/kubectl"
kubelet_download_url: "{{ files_repo }}/kubernetes/{{ kube_version }}/kubelet"
# etcd is optional if you **DON'T** use etcd_deployment=host
etcd_download_url: "{{ files_repo }}/kubernetes/etcd/etcd-{{ etcd_version }}-linux-amd64.tar.gz"
cni_download_url: "{{ files_repo }}/kubernetes/cni/cni-plugins-linux-{{ image_arch }}-{{ cni_version }}.tgz"
crictl_download_url: "{{ files_repo }}/kubernetes/cri-tools/crictl-{{ crictl_version }}-{{ ansible_system | lower }}-{{ image_arch }}.tar.gz"
# If using Calico
calicoctl_download_url: "{{ files_repo }}/kubernetes/calico/{{ calico_ctl_version }}/calicoctl-linux-{{ image_arch }}"
# If using Calico with kdd
calico_crds_download_url: "{{ files_repo }}/kubernetes/calico/{{ calico_version }}.tar.gz"
# Containerd
containerd_download_url: "{{ files_repo }}/containerd-{{ containerd_version }}-linux-{{ image_arch }}.tar.gz"
runc_download_url: "{{ files_repo }}/runc.{{ image_arch }}"
nerdctl_download_url: "{{ files_repo }}/nerdctl-{{ nerdctl_version }}-{{ ansible_system | lower }}-{{ image_arch }}.tar.gz"
# Insecure registries for containerd
containerd_insecure_registries:
  - "{{ registry_host }}"

# CentOS/Redhat/AlmaLinux/Rocky Linux
## Docker / Containerd
docker_rh_repo_base_url: "{{ yum_repo }}/docker-ce/$releasever/$basearch"
docker_rh_repo_gpgkey: "{{ yum_repo }}/docker-ce/gpg"

# Fedora
## Docker
docker_fedora_repo_base_url: "{{ yum_repo }}/docker-ce/{{ ansible_distribution_major_version }}/{{ ansible_architecture }}"
docker_fedora_repo_gpgkey: "{{ yum_repo }}/docker-ce/gpg"
## Containerd
containerd_fedora_repo_base_url: "{{ yum_repo }}/containerd"
containerd_fedora_repo_gpgkey: "{{ yum_repo }}/docker-ce/gpg"

# Debian
## Docker
docker_debian_repo_base_url: "{{ debian_repo }}/docker-ce"
docker_debian_repo_gpgkey: "{{ debian_repo }}/docker-ce/gpg"
## Containerd
containerd_debian_repo_base_url: "{{ ubuntu_repo }}/containerd"
containerd_debian_repo_gpgkey: "{{ ubuntu_repo }}/containerd/gpg"
containerd_debian_repo_repokey: 'YOURREPOKEY'

# Ubuntu
## Docker
docker_ubuntu_repo_base_url: "{{ ubuntu_repo }}/docker-ce"
docker_ubuntu_repo_gpgkey: "{{ ubuntu_repo }}/docker-ce/gpg"
## Containerd
containerd_ubuntu_repo_base_url: "{{ ubuntu_repo }}/containerd"
containerd_ubuntu_repo_gpgkey: "{{ ubuntu_repo }}/containerd/gpg"
containerd_ubuntu_repo_repokey: 'YOURREPOKEY'

For the OS specific settings, just define the one matching your OS. If you use the settings like the one above, you'll need to define in your inventory the following variables:

  • registry_host: Container image registry. If you don't use the same repository path for the container images that the ones defined in Download's role defaults, you need to override the *_image_repo for these container images. If you want to make your life easier, use the same repository path, you won't have to override anything else.
  • files_repo: HTTP webserver or reverse proxy that is able to serve the files listed above. Path is not important, you can store them anywhere as long as it's accessible by kubespray. It's recommended to use *_version in the path so that you don't need to modify this setting everytime kubespray upgrades one of these components.
  • yum_repo/debian_repo/ubuntu_repo: OS package repository depending of your OS, should point to your internal repository. Adjust the path accordingly.

Install Kubespray Python Packages

Recommended way: Kubespray Container Image

The easiest way is to use kubespray container image as all the required packages are baked in the image. Just copy the container image in your private container image registry and you are all set!

Manual installation

Look at the requirements.txt file and check if your OS provides all packages out-of-the-box (Using the OS package manager). For those missing, you need to either use a proxy that has Internet access (typically from a DMZ) or setup a PyPi server in your network that will host these packages.

If you're using a HTTP(S) proxy to download your python packages:

sudo pip install --proxy=https://[username:password@]proxyserver:port -r requirements.txt

When using an internal PyPi server:

# If you host all required packages
pip install -i https://pypiserver/pypi -r requirements.txt

# If you only need the ones missing from the OS package manager
pip install -i https://pypiserver/pypi package_you_miss

Run Kubespray as usual

Once all artifacts are in place and your inventory properly set up, you can run kubespray with the regular cluster.yaml command:

ansible-playbook -i inventory/my_airgap_cluster/hosts.yaml -b cluster.yml

If you use Kubespray Container Image, you can mount your inventory inside the container:

docker run --rm -it -v path_to_inventory/my_airgap_cluster:inventory/my_airgap_cluster myprivateregisry.com/kubespray/kubespray:v2.14.0 ansible-playbook -i inventory/my_airgap_cluster/hosts.yaml -b cluster.yml