mirror of
https://code.forgejo.org/infrastructure/documentation
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108 lines
3.2 KiB
Markdown
108 lines
3.2 KiB
Markdown
# K8S node
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Installing a K8S node using [scripts from the k3s-host](k3s-host) directory.
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## Imaging
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Using installimage from the rescue instance.
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- `wipefs -fa /dev/nvme*n1`
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- `installimage -r no -n hetzner0?`
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- Debian bookworm
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- `PART / ext4 100G`
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- `PART /srv ext4 all`
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- ESC 0 + yes
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- reboot
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Partitioning.
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- First disk
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- OS
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- non precious data such as the LXC containers with runners.
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- Second disk
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- a partition configured with DRBD
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Debian user.
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- `ssh root@hetzner0?.forgejo.org`
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- `useradd --shell /bin/bash --create-home --groups sudo debian`
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- `mkdir -p /home/debian/.ssh ; cp -a .ssh/authorized_keys /home/debian/.ssh ; chown -R debian /home/debian/.ssh`
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- in `/etc/sudoers` edit `%sudo ALL=(ALL:ALL) NOPASSWD:ALL`
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## Install helpers
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Each node is identifed by the last digit of the hostname.
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```sh
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sudo apt-get install git etckeeper
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git clone https://code.forgejo.org/infrastructure/documentation
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cd documentation/k3s-host
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cp variables.sh.example variables.sh
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cp secrets.sh.example secrets.sh
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```
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Variables that must be set depending on the role of the node.
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- first server node
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- secrets.sh: node_drbd_shared_secret
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- other server node
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- secrets.sh: node_drbd_shared_secret
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- secrets.sh: node_k8s_token: content of /var/lib/rancher/k3s/server/token on the first node
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- variables.sh: node_k8s_existing: identifier of the first node (e.g. 5)
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- etcd node
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- secrets.sh: node_k8s_token: content of /var/lib/rancher/k3s/server/token on the first node
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- variables.sh: node_k8s_existing: identifier of the first node (e.g. 5)
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- variables.sh: node_k8s_etcd: identifier of the node whose role is just etcd (e.g. 3)
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The other variables depend on the setup.
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## Firewall
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`./setup.sh setup_ufw`
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## DRBD
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DRBD is [configured](https://linbit.com/drbd-user-guide/drbd-guide-9_0-en/#p-work) with:
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`./setup.sh setup_drbd`
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Once two nodes have DRBD setup for the first time, it can be initialized by [pretending all is in sync](https://linbit.com/drbd-user-guide/drbd-guide-9_0-en/#s-skip-initial-resync) to save the initial bitmap sync since there is actually no data at all.
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```sh
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sudo drbdadm primary r1
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sudo drbdadm new-current-uuid --clear-bitmap r1/0
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sudo mount /precious
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```
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## NFS
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`./setup.sh setup_nfs`
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On the node that has the DRBD volume `/precious` mounted, set the IP of the NFS server to be used by k8s:
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```sh
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sudo ip addr add 10.53.101.100/24 dev enp5s0.4001
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```
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## K8S
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For the first node `./setup.sh setup_k8s`. For nodes joining the cluster `./setup.sh setup_k8s 6` where `hetzner06` is an existing node.
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- [metallb](https://metallb.universe.tf) instead of the default load balancer because it does not allow for a public IP different from the `k8s` node IP.
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`./setup.sh setup_k8s_metallb`
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- [traefik](https://traefik.io/) [v2.10](https://doc.traefik.io/traefik/v2.10/) installed from the [v25.0](https://github.com/traefik/traefik-helm-chart/tree/v25.0.0) helm chart.
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`./setup.sh setup_k8s_traefik`
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- [cert-manager](https://cert-manager.io/).
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`./setup.sh setup_k8s_certmanager`
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- NFS storage class
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`./setup.sh setup_k8s_nfs`
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## K8S NFS storage creation
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Define the 20GB `forgejo-data` pvc owned by user id 1000.
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```sh
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./setup.sh setup_k8s_pvc forgejo-data 20Gi 1000
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```
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