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Merge pull request 'hetzner{05,06} k8s node & network configuration' (#13) from earl-warren/documentation:wip-k8s-network into main

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Reviewed-on: https://code.forgejo.org/infrastructure/documentation/pulls/13
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earl-warren 2024-09-29 15:59:27 +00:00
parent 743251c733 015327b5e3
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README.md
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@ -343,6 +343,14 @@ iface enp5s0.4000 inet static
The IP address ends with the same number as the hardware (hetzner02 => .2).
#### vSwitch DRBD
The vSwitch on VLAN 4000 is for DRBD exclusively
#### vSwitch k8s
The vSwitch on VLAN 4002 is for the k8s control plane
### DRBD
DRBD is [configured](https://linbit.com/drbd-user-guide/drbd-guide-9_0-en/#p-work) like in the following example with hetzner02 as the primary and hetzner03 as the secondary:
@ -724,6 +732,179 @@ stream {
Dedicated to https://codeberg.org/forgejo-contrib/forgejo-helm and running from an ephemeral disk
### hetzner{05,06}
https://hetzner05.forgejo.org & https://hetzner06.forgejo.org run on [EX44](https://www.hetzner.com/dedicated-rootserver/ex44) Hetzner hardware.
#### LXC
```sh
lxc-helpers.sh lxc_install_lxc_inside 10.47.3 fc11
```
#### Disk partitioning
- First disk
- OS
- non precious data such as the LXC containers with runners.
- Second disk
- a partition configured with DRBD
#### Root filesystem backups
- `hetzner05:/etc/cron.daily/backup-hetzner06`
`rsync -aHSv --delete-excluded --delete --numeric-ids --exclude /proc --exclude /dev --exclude /sys --exclude /srv --exclude /var/lib/lxc 10.53.100.6:/ /srv/backups/hetzner06/`
- `hetzner06:/etc/cron.daily/backup-hetzner05`
`rsync -aHSv --delete-excluded --delete --numeric-ids --exclude /proc --exclude /dev --exclude /sys --exclude /srv --exclude /var/lib/lxc 10.53.100.5:/ /srv/backups/hetzner05/`
#### Failover IP addresses
The failover IP addresses are configured on all hosts. Their routing is managed by the [Hetzner k8s controller](https://github.com/cbeneke/hcloud-fip-controller).
```
auto enp5s0
iface enp5s0 inet static
...
up ip addr add 188.40.16.47/32 dev enp5s0
iface enp5s0 inet6 static
...
up ip addr add 2a01:4f8:fff2:48::2/64 dev enp5s0
```
#### k8s node
```sh
$ cat /etc/rancher/k3s/config.yaml.d/config.yaml
# https://docs.k3s.io/installation/network-options
# the ipv4-ranges are default in k3s
# the fd-range is a private ipv6-range
cluster-cidr: 10.42.0.0/16,fd01::/48
service-cidr: 10.43.0.0/16,fd02::/112
disable:
- servicelb
```
The `10.88.1.5` and `fd01::5` IPs are assigned to the interface with VLAN 4002.
```
auto enp5s0.4002
iface enp5s0.4002 inet static
address 10.88.1.5
netmask 255.255.0.0
vlan-raw-device enp5s0
mtu 1400
up ip addr add fd01::5/48 dev enp5s0.4002
```
```sh
sudo apt-get install curl
curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC='--write-kubeconfig-mode=644 --node-ip=10.88.1.5,fd01::5' sh -
curl -fsSL https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash -
```
### k8s networking
`k3s` is configured to use [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.
[metallb](https://metallb.universe.tf).
```
helm install metallb metallb/metallb
cat > metallb.yaml <<EOF
apiVersion: metallb.io/v1beta1
kind: IPAddressPool
metadata:
name: first-pool
spec:
addresses:
- 188.40.16.47/32
- 2a01:4f8:fff2:48::0/64
EOF
kubectl apply --server-side=true -f metallb.yml
```
[cert-manager](https://cert-manager.io/).
```
helm install mycertmanager --set installCRDs=true oci://registry-1.docker.io/bitnamicharts/cert-manager
cat > clusterissuer.yml <<EOF
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-http
spec:
acme:
email: contact@forgejo.org
server: https://acme-v02.api.letsencrypt.org/directory
privateKeySecretRef:
name: letsencrypt-http
solvers:
- http01:
ingress:
class: traefik
EOF
kubectl apply --server-side=true -f clusterissuer.yml
```
[traefik](https://traefik.io/) requests with [annotations](https://github.com/traefik/traefik-helm-chart/blob/7a13fc8a61a6ad30fcec32eec497dab9d8aea686/traefik/values.yaml#L736) specific IPs from `metalldb`.
```
cat > traefik.yml <<EOF
apiVersion: helm.cattle.io/v1
kind: HelmChartConfig
metadata:
name: traefik
namespace: kube-system
spec:
valuesContent: |-
service:
annotations:
metallb.universe.tf/allow-shared-ip: "key-to-share-188-40-16-47"
metallb.universe.tf/loadBalancerIPs: 188.40.16.47,2a01:4f8:fff2:48::2
EOF
kubectl apply --server-side=true -f traefik.yml
```
[forgejo](https://code.forgejo.org/forgejo-helm/forgejo-helm) configuration in [ingress](https://code.forgejo.org/forgejo-helm/forgejo-helm#ingress) for the reverse proxy (`traefik`) to route the domain and for the ACME issuer (`cert-manager`) to obtain a certificate. And in [service](https://code.forgejo.org/forgejo-helm/forgejo-helm#service) for the `ssh` port to be bound to the desired IPs of the load balancer (`metallb`).
```
ingress:
enabled: true
annotations:
# https://cert-manager.io/docs/usage/ingress/#supported-annotations
# https://github.com/cert-manager/cert-manager/issues/2239
cert-manager.io/cluster-issuer: letsencrypt-http
cert-manager.io/private-key-algorithm: ECDSA
cert-manager.io/private-key-size: 384
kubernetes.io/ingress.class: traefik
traefik.ingress.kubernetes.io/router.entrypoints: websecure
tls:
- hosts:
- t1.forgejo.org
secretName: tls-forgejo-t1-ingress-http
hosts:
- host: t1.forgejo.org
paths:
- path: /
pathType: Prefix
service:
http:
type: ClusterIP
ipFamilyPolicy: PreferDualStack
port: 3000
ssh:
type: LoadBalancer
annotations:
metallb.universe.tf/loadBalancerIPs: 188.40.16.47,2a01:4f8:fff2:48::2
metallb.universe.tf/allow-shared-ip: "key-to-share-188-40-16-47"
ipFamilyPolicy: PreferDualStack
port: 2222
```
## Uberspace
The website https://forgejo.org is hosted at