109 lines
4.2 KiB
Markdown
109 lines
4.2 KiB
Markdown
# k8s-clusters
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This repository contains the configuration, scripts, and other goodies for
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building and managing my kubernetes clusters (right now, that's just my home
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cluster). I share the source with you so you can make exactly the same mistakes
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as I do.
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## Setup
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Setup the pre-commit hooks before you change anything!
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```
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pip install pre-commit
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pre-commit install --install-hooks
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pre-commit autoupdate
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```
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## Provision Machines
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Before we interact with the cluster, we have some manual work to do.
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### Manual Preparation
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- Currently, my nodes are Arch Linux machines on bare metal
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- Nodes must be ready to be controlled via Ansible
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- Have `python3` installed
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- Need to be `ssh`-able from a controller (my workstation)
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- `curl -L files.lyte.dev/key.pub >> ~/.ssh/authorized_keys`
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### Automated Provisioning
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- Setup Ansible on the controller (from `./ansible`)
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- `ansible-galaxy install -r requirements.yml --force`
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- Verify Ansible can reach hosts (from `./ansible`)
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- `ansible all -i inventory/hosts.yml --list-hosts`
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- `ansible all -i inventory/hosts.yml -m ping`
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- Use Ansible to build the cluster as configured on all nodes (from `./ansible`)
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- `ansible-playbook -i inventory/hosts.yml ./build-k3s-cluster`
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And the cluster is up! If you want to interact with it from your controller,
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you can do this:
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```bash
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ansible -i ansible/inventory/hosts.yml $REMOTE_HOST -m fetch \
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-a "src=/etc/rancher/k3s/k3s.yaml dest=./k3s-cluster-config.kubeconfig.yaml flat=yes"
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# TODO: this did not work for me
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# env KUBECONFIG="~/.kube/config:./k3s-cluster-config.kubeconfig.yaml" \
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# kubectl config view --flatten | sed "s/127.0.0.1/$REMOTE_HOST/" > ~/.kube/new-config
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```
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- Copy the cluster information from the `./k3s-cluster-config.kubeconfig.yaml` file into
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your existing `~/.kube/config` (or just copy it there if it doesn't exist)
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- You will need to edit the host from `localhost`/`127.0.0.1` to the correct host
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### Automated Teardown
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```bash
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ansible-playbook -i inventory/hosts.yml ./nuke-k3s-cluster
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```
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## Setting up Flux
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- Install the `flux` CLI on a machine that can `kubectl` into the shiny, new cluster
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- `paru -S flux-bin`
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- or `curl -s https://fluxcd.io/install.sh | sudo bash`
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- https://fluxcd.io/docs/installation/
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- Run the pre-flight check (you must have `~/.kube/config` setup!)
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- `flux check --pre`
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- Create the `flux-system` namespace
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- `kubectl create namespace flux-system --dry-run=client -o yaml | kubectl apply -f -`
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- Add the `sops-age` encryption key to the namespace
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```bash
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pass home-k8s-cluster | grep age-secret-key | aws '{printf $2}' | \
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kubectl --namespace flux-system create secret generic sops-age \
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--from-file=age.agekey=/dev/stdin
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```
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- Install Flux
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```
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flux bootstrap git --url=$SSH_REPO_URL --branch=master \
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--path=./cluster --private-key-file=$FLUX_PRIVATE_KEY_FILE
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```
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# To Do & Status
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- Flux setup needs to be finalized
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- Currently having issues getting it to bootstrap since it seems to think my
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secrets file is supposed to be a k8s resource
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- How am I going to handle highly-available storage?
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- `cert-manager` with CloudFlare?
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- `external-dns` with CloudFlare?
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- I still need to figure out my overall cluster structure
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- Since my goal is to have full redundancy, I believe I need at least
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2 control plane nodes, which since I need an odd number means 3 control
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plane nodes, and at least 2 worker nodes. This means 5 nodes total.
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I should be able to use some of my rpi4s in the cluster, probably as
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control plane nodes.
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- Where/how is storage attached?
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- I need to figure out a migration plan from my current Netlify + Custom DDNS + Docker Compose setup
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- I should be able to do something like the following:
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- Setup all applications on the cluster using some dummy domain
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- Make sure everything works with the dummy domain
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- Change dummy domain to real domain
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- Change domain's nameserver to cloudflare
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- Should be all set!
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- I want to look into Talos/Sidero + PXEBoot, since that could remove a lot of the ansible stuff?
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- `k3s` has a decent amount of magic AFAICT, so I'd like to learn more about it
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and all its components so I better understand what my system is actually
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_doing_
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