homelab-v/tofu/kubernetes

Kubernetes Tofu

Read Talos Kubernetes on Proxmox using OpenTofu for a more thorough explanation of how everything works.

Install pre-requisites

1. tofu
2. talosctl
3. kubectl

Initialize tofu

tofu init

Proxmox

Environment variable

export TF_VAR_proxmox_api_token="<YOUR_API_TOKEN>"

Optional External Secrets Manager / Other methods

Bitwarden Secrets Manager - Name your secret TF_VAR_proxmox_api_token in bws.

bws run -- tofu ...

Note: By default, the shell is sh. Change with --shell if required.

Sealed-secrets

Generate certificate

openssl req -x509 -days 365 -nodes -newkey rsa:4096 -keyout sealed-secrets.key -out sealed-secrets.crt -subj "/CN=sealed-secret/O=sealed-secret"

Kubernetes

Output kubeconfig

tofu output -raw kube_config

Talos

Output talosconfig

tofu output -raw talos_config

Upgrading Talos and Kubernetes

Upgrade talos nodes one by one.

1. Set talos_image.auto.tfvars -> image -> update_version to the required update version.
2. Set talos_cluster.auto.tfvars -> talos_cluster_config -> kubernetes_version to the required kubernetes version.
3. Set talos_nodes.auto.tfvars -> talos_nodes -> $node_1 -> update = true and run tofu apply.
4. Set talos_nodes.auto.tfvars -> talos_nodes -> $node_2 -> update = true, leave the previous nodes update = true and run tofu apply.
5. Set talos_nodes.auto.tfvars -> talos_nodes -> $node_3 -> update = true, leave the previous nodes update = true and run tofu apply.
6. ...
7. Set talos_nodes.auto.tfvars -> talos_nodes -> $node_n -> update = true, leave the previous nodes update = true and run tofu apply.
8. After upgrading all nodes, Set talos_image.auto.tfvars -> image -> version to match the update version and set update = false for all nodes.

Upgrading Talos Schematic

1. Create a new schematic file.
2. Same process as above instead of image.version and image.update_version, change image.schematic and image.update_schematic, in talos_image.auto.tfvars.

Reuse machine secrets

tofu state rm module.talos.talos_machine_secrets.this
tofu import module.talos.talos_machine_secrets.this output/talos-machine-secrets.yaml
tofu apply --refresh=false