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k3s + rook Homelab

Writeup still a WIP, please pardon the dust.

Below is mostly braindumps & rough commands for creating/tweaking these services. Formal writeup coming soon!

k3s

installing k3s

curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="server --cluster-init" sh -
export NODE_TOKEN=$(cat /var/lib/rancher/k3s/server/node-token)
curl -sfL https://get.k3s.io | K3S_TOKEN=$NODE_TOKEN INSTALL_K3S_EXEC="server --server https://192.168.122.87:6443" INSTALL_K3S_VERSION=v1.23.6+k3s1 sh -

upgrading k3s

TODO

rook

installing rook

KUBECONFIG=/etc/rancher/k3s/k3s.yaml helm upgrade --install --create-namespace --namespace rook-ceph rook-ceph rook-release/rook-ceph:1.9.2 -f rook-ceph-values.yaml

KUBECONFIG=/etc/rancher/k3s/k3s.yaml helm install --create-namespace --namespace rook-ceph rook-ceph-cluster --set operatorNamespace=rook-ceph rook-release/rook-ceph-cluster:1.9.2 -f rook-ceph-cluster-values.yaml

upgrading rook

TODO

Finding the physical device for an OSD

ceph osd metadata

Sharing 1 CephFS instance between multiple PVCs

https://github.com/rook/rook/blob/677d3fa47f21b07245e2e4ab6cc964eb44223c48/Documentation/Storage-Configuration/Shared-Filesystem-CephFS/filesystem-storage.md

Create CephFilesystem Create SC backed by Filesystem & Pool Ensure the CSI subvolumegroup was created. If not, ceph fs subvolumegroup create <fsname> csi Create PVC without a specified PV: PV will be auto-created Super important: Set created PV to ReclaimPolicy: Retain Create a new, better-named PVC

tolerations

If your setup divides k8s nodes into ceph & non-ceph nodes (using a label, like storage-node=true), ensure labels & a toleration are set properly (storage-node=false, with a toleration checking for storage-node) so non-ceph nodes still run PV plugin Daemonsets.

Otherwise, any pod scheduled on a non-ceph node won't be able to mount ceph-backed PVCs.

See rook-ceph-cluster-values.yaml->cephClusterSpec->placement for an example.

CephFS w/ EC backing pool

EC-backed filesystems require a regular replicated pool as a default.

https://lists.ceph.io/hyperkitty/list/[email protected]/thread/QI42CLL3GJ6G7PZEMAD3CXBHA5BNWSYS/ https://tracker.ceph.com/issues/42450

Then setfattr a directory on the filesystem with an EC-backed pool. Any new data written to the folder will go to the EC-backed pool.

setfattr -n ceph.dir.layout.pool -v cephfs-erasurecoded /mnt/cephfs/my-erasure-coded-dir

https://docs.ceph.com/en/quincy/cephfs/file-layouts/

Crush rules for each pool

for i in ceph osd pool ls; do echo $i: ceph osd pool get $i crush_rule; done

On ES backed pools, device class information is in the erasure code profile, not the crush rule. https://docs.ceph.com/en/latest/dev/erasure-coded-pool/

for i in ceph osd erasure-code-profile ls; do echo $i: ceph osd erasure-code-profile get $i; done

ObjectStore

If hostNetwork is enabled on the cluster, ensure rook-ceph-operator is not running with hostNetwork enable. It doesn't need host network access to orchestrate the cluster, & impedes orchestration of objectstores & associated resources.

public s3-interface bucket listing w/ HTML

This is great for setting up easy public downloads.

  • Create a user (rook/buckets/user-josh.yaml)
  • kubectl -n rook-ceph get secret rook-ceph-object-user-ceph-objectstore-josh -o go-template='{{range $k,$v := .data}}{{printf "%s: " $k}}{{if not $v}}{{$v}}{{else}}{{$v | base64decode}}{{end}}{{"\n"}}{{end}}
  • Create bucket (rook/buckets/bucket.py::create_bucket)
  • Set policy (rook/buckets/bucket.py::set_public_read_policy)

  • Upload file

    from bucket import *
conn = connect()
conn.upload_file('path/to/s3-bucket-listing/index.html', 'public', 'index.html', ExtraArgs={'ContentType': 'text/html'})

nvidia driver (on debian)

curl -s -L https://nvidia.github.io/nvidia-container-runtime/gpgkey |   sudo apt-key add -
distribution=$(. /etc/os-release;echo $ID$VERSION_ID)
curl -s -L https://nvidia.github.io/nvidia-container-runtime/$distribution/nvidia-container-runtime.list |   sudo tee /etc/apt/sources.list.d/nvidia-container-runtime.list

wget https://developer.download.nvidia.com/compute/cuda/11.6.2/local_installers/cuda-repo-debian11-11-6-local_11.6.2-510.47.03-1_amd64.deb
sudo dpkg -i cuda-repo-debian11-11-6-local_11.6.2-510.47.03-1_amd64.deb
sudo apt-key add /var/cuda-repo-debian11-11-6-local/7fa2af80.pub
sudo apt-get update

install kernel headers

sudo apt install cuda nvidia-container-runtime nvidia-kernel-dkms

sudo apt install --reinstall nvidia-kernel-dkms

verify dkms is actually running

sudo vi /etc/modprobe.d/blacklist-nvidia-nouveau.conf

blacklist nouveau
options nouveau modeset=0

sudo update-initramfs -u

configure containerd to use nvidia by default

Copy https://github.com/k3s-io/k3s/blob/v1.24.2%2Bk3s2/pkg/agent/templates/templates_linux.go into /var/lib/rancher/k3s/agent/etc/containerd/config.toml.tmpl (substitute your k3s version)

Edit the file:

<... snip>
  conf_dir = "{{ .NodeConfig.AgentConfig.CNIConfDir }}"
{{end}}
[plugins.cri.containerd.runtimes.runc]
  runtime_type = "io.containerd.runc.v2"

[plugins.cri.containerd.runtimes.runc.options]
  BinaryName = "/usr/bin/nvidia-container-runtime"

{{ if .PrivateRegistryConfig }}
<... snip>

& then systemctl restart k3s

Label your GPU-capable nodes: kubectl label nodes <node name> gpu-node=true

& then install the nvidia device plugin:

helm repo add nvdp https://nvidia.github.io/k8s-device-plugin
helm repo update
KUBECONFIG=/etc/rancher/k3s/k3s.yaml helm upgrade -i nvdp nvdp/nvidia-device-plugin --version=0.12.2 --namespace nvidia-device-plugin --create-namespace --set-string nodeSelector.gpu-node=true

Ensure the pods on the namespace are Running.

Test GPU passthrough by applying examples/cuda-pod.yaml, then exec-ing into it & running nvidia-smi.

Sharing GPU

https://github.com/NVIDIA/k8s-device-plugin#shared-access-to-gpus-with-cuda-time-slicing

version: v1
sharing:
  timeSlicing:
    renameByDefault: false
    failRequestsGreaterThanOne: false
    resources:
    - name: nvidia.com/gpu
      replicas: 5

$ helm upgrade -i nvdp nvdp/nvidia-device-plugin ... --set-file config.map.config=nvidia-device-plugin-config.yaml

ceph client for cephfs volumes

New method

https://docs.ceph.com/en/latest/man/8/mount.ceph/

sudo mount -t ceph user@<cluster FSID>.<filesystem name>=/ /mnt/ceph -o secret=<secret key>,x-systemd.requires=ceph.target,x-systemd.mount-timeout=5min,_netdev,mon_addr=192.168.1.1

Older method (stopped working for me around Pacific)

sudo vi /etc/fstab

192.168.1.1,192.168.1.2:/    /ceph   ceph    name=admin,secret=<secret key>,x-systemd.mount-timeout=5min,_netdev,mds_namespace=data

disable mitigations

https://unix.stackexchange.com/questions/554908/disable-spectre-and-meltdown-mitigations

Monitoring

https://rpi4cluster.com/monitoring/monitor-intro/, + what's in the monitoring folder.

Tried https://github.com/prometheus-operator/kube-prometheus. The only way to persist dashboards is to add them to Jsonnet & apply the generated configmap. I'm not ready for that kind of IaC commitment in a homelab.

Exposing internal services

kubectl expose svc/some-service --name=some-service-external --port 1234 --target-port 1234 --type LoadBalancer

Service will then be available on port 1234 of any k8s node.

libvirtd

...

Still to do

  • deluge
  • gogs ssh ingress (can't go through cloudflare without cloudflared on the client)
  • Something better than expose for accessing internal services
  • replicated_ssd crush rule never resolves (or didn't on data-metadata)