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+/kubeconfig

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README.md

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+# homeops
+
+Definitions for my main Kubernetes cluster at home. Current setup:
+
+| Hostname | IP address | Model               | Arch    | OS          |
+|----------|------------|---------------------|---------|-------------|
+| pinfra-1 | 10.0.0.20  | Raspberry Pi 4B 8GB | armv7l  | Raspbian 10 |
+| pinfra-2 | 10.0.0.21  | Raspberry Pi 4B 8GB | aarch64 | Debian 10   |
+
+## Core stack
+
+* `k3s` is used on all nodes for the Kubernetes service. Bootstrapping
+is done through [`k3sup`](https://github.com/alexellis/k3sup). You
+should already have means to SSH into the nodes before using
+`k3sup`. Refer to the [project
+documentation](https://github.com/alexellis/k3sup/blob/master/README.md)
+to learn more.
+
+* `flux` for defining the whole Kubernetes desired states.
+
+### Workloads
+
+* `cert-manager`
+* `docker-registry-ui`
+* `external-dns`
+* `ingress-nginx`
+* `longhorn`: WIP
+* `pihole`
+* `sealed-secrets`
+* `unifi`
+* `velero`: WIP
+
+The main definition for `flux` is at
+[`flux/clusters/pinfra`](flux/clusters/pinfra).
+
+`longhorn` is targeted for `pinfra-2` exclusively, given that [armv7
+is not yet
+supported](https://github.com/longhorn/longhorn/issues/1997).
+
+### Bootstrap Kubernetes
+
+You can do the initial SSH setup by touching an `ssh` file in the SD
+card partition mounted in `/boot`, so when the Raspberries boot, an
+SSH server is started.
+
+The [`bootstrap`](bootstrap) folder contains scripts for bootstrapping
+`k3s` and `flux`.
+
+#### Before boostrapping `k3s`
+
+Update `/boot/cmdline.txt` and add the following towards the end:
+
+```
+cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory
+```
+
+This ensures the `k3s` agent -- essentially the Kubernetes `kubelet`
+-- will work as expected.
+
+#### `pinfra-1`
+
+##### Bootstrap the `k3s` server
+
+From within the private network, I execute:
+
+```console
+$ bootstrap/k3s-server pinfra-1
+```
+
+##### Import the sealed secrets private key
+
+> Note: if you are an external user, the `SealedSecrets` included in
+> this repository won't be usable and you'll have to generate a
+> key pair and generate your own `SealedSecrets`.
+
+Before we deploy anything, we have to restore the private key (a
+regular Kubernetes `Secret`)used to decipher the `SealedSecrets` in
+this repository. The private key is not in this repositoy, as it
+contains `SealedSecrets` with sensitive contents.
+
+The private key is stored in a safe place I can restore it from, so I
+can reuse the `SealedSecrets` you see on this repository.
+
+```console
+$ KUBECONFIG=kubeconfig k apply -f /secret/place/pinfra-master-key.yaml
+```
+
+#### `pinfra-2`
+
+```console
+$ bootstrap/k3s-agent pinfra-1 pinfra-2
+```
+
+##### Label node
+
+By labeling the node we allow the Kubernetes scheduler to target nodes
+like this one exclusively, by using a `nodeSelector`.
+
+```console
+$ KUBECONFIG=kubeconfig k label nodes pinfra-2 usage=storage
+```
+
+##### Taint node
+
+A node selector is nice for workloads targeting specific nodes, but
+that does not exclude this node from being scheduled other
+workloads.
+
+`pinfra-2` is only meant to run storage workloads, so we want to avoid
+general workloads to land in this node. And so, we taint the node.
+
+```console
+$ KUBECONFIG=kubeconfig k taint nodes pinfra-2 dedicated=storage:NoSchedule
+```
+
+### Bootstrap Flux (and all workloads as a result)
+
+Create a GitHub Personal Access Token (PAT) in your [account
+settings](https://github.com/settings/tokens). This is so `flux` can
+create a GitHub Deploy Key and push changes back to the repository.
+
+```console
+$ KUBECONFIG=kubeconfig GITHUB_TOKEN=$(cat /secret/place/gh-token) bootstrap/flux
+```
+
+This will deploy `flux` and add this repository to the `flux`
+definitions.
+
+Now it's time to wait until all workloads are correctly running in
+your cluster.
+
+### Cleanup
+
+For cleaning up in a quick way and retry the bootstrap if needed, you
+can SSH into the node to be cleaned up and execute:
+
+```console
+# k3s-uninstall.sh
+```
+
+On an agent node you can run:
+
+```console
+# k3s-agent-uninstall.sh
+```
+
+And then you can delete the node from Kubernetes with `k delete node
+<node-name>`.

bootstrap/flux

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+#!/usr/bin/env bash
+
+if [ -z "${GITHUB_TOKEN}" ]; then
+    echo "set the GITHUB_TOKEN envvar to a Personal Access Token (PAT) of your account in order to bootstrap. This token will be used by flux to add a deploy key to the homeops repository"
+    exit 1
+fi
+
+REPO_OWNER=${REPO_OWNER:-ereslibre}
+REPO_NAME=${REPO_NAME:-homeops}
+REPO_BRANCH=${REPO_BRANCH:-main}
+REPO_PATH=${REPO_PATH:-flux/clusters/pinfra}
+
+flux bootstrap github \
+     --owner "${REPO_OWNER}" \
+     --repository "${REPO_NAME}" \
+     --branch "${REPO_BRANCH}" \
+     --path "${REPO_PATH}"

bootstrap/k3s-agent

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+#!/usr/bin/env bash
+
+if [ "$#" -ne 2 ]; then
+    echo "usage: $0 <k3s-server> <host>"
+    exit 1
+fi
+
+K3S_SERVER=${K3S_SERVER:-"$1"}
+HOST=${HOST:-"$2"}
+
+k3sup join \
+      --host "${HOST}" \
+      --user pi \
+      --server-host "${K3S_SERVER}"