Raspberry Pi K3s Alpine Linux Part 2
Continue part 2 of Raspberry Pi K3s Alpine Linux Part 1. Now we are going to deploy K3s (a light version of Kubernetes) on Raspberry Pi.
Setup Kubernetes
don't have it!.apk update
apk add curl wget
Setup Static IP address to 192.168.1.100 for master node with 255.255.255.0 (/24) subnet. The default gateway set to 192.168.0.100:
vi /etc/network/interfaces
auto eth0
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
gateway 192.168.0.1
Remove wpa_supplicant change to wireguard because By default, K3s will run with flannel as the CNI, using VXLAN as the default backend More.
apk del wpa_supplicant
swapoff -a
free -m
apk add wireguard-tools
modprobe wireguard
Edit /etc/modules and add wireguard in last line.
af_packet
ipv6
wireguard
Reboot to load wireguard.
reboot
** Install for master node using command as below. If the worker button is set, skip and scroll down** K3s is installed through a bash script that performs all the actions in the background without user input. Open the console of your Alpine Linux and run the command below. We also push option include --flannel-backend=wireguard, --disable-cloud-controller, and --no-deploy traefik (use ingress-nginx as alternative).
curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="--no-deploy traefik --flannel-backend=wireguard --node-taint CriticalAddonsOnly=true:NoExecute --disable-cloud-controller" sh -s -
Command execution output:
[INFO] Finding release for channel stable
[INFO] Using v1.24.6+k3s1 as release
[INFO] Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.24.6+k3s1/sha256sum-arm64.txt
[INFO] Downloading binary https://github.com/k3s-io/k3s/releases/download/v1.24.6+k3s1/k3s-arm64
[INFO] Verifying binary download
[INFO] Installing k3s to /usr/local/bin/k3s
[INFO] Skipping installation of SELinux RPM
[INFO] Creating /usr/local/bin/kubectl symlink to k3s
[INFO] Creating /usr/local/bin/crictl symlink to k3s
[INFO] Creating /usr/local/bin/ctr symlink to k3s
[INFO] Creating killall script /usr/local/bin/k3s-killall.sh
[INFO] Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO] env: Creating environment file /etc/rancher/k3s/k3s.env
[INFO] openrc: Creating service file /etc/init.d/k3s
[INFO] openrc: Enabling k3s service for default runlevel
[INFO] openrc: Starting k3s
* Caching service dependencies ... [ ok ]
* Mounting cgroup filesystem ... [ ok ]
* Starting k3s ... [ ok ]
Confirm a list of running services:
$ rc-status
Runlevel: default
crond [ started ]
acpid [ started ]
haveged [ started ]
net-online [ started ]
k3s [ started 00:01:22 (0) ]
qemu-guest-agent [ started ]
sshd [ started ]
Dynamic Runlevel: hotplugged
Dynamic Runlevel: needed/wanted
sysfs [ started ]
fsck [ started ]
root [ started ]
localmount [ started ]
cgroups [ started ]
Dynamic Runlevel: manual
Check Cluster nodes status:
$ sudo kubectl get nodes
Install for worker need token from master token.
# ssh to master-0 and get token by command below
cat /var/lib/rancher/k3s/server/node-token
Install agent node. The command to add additional node will look similar to this:
curl -sfL https://get.k3s.io | K3S_TOKEN="K10efd2f698fc0..." K3S_URL="https://192.168.0.100:6443" sh -
Check Cluster!
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master-0 Ready control-plane,master 3h25m v1.24.6+k3s1
worker-1 Ready <none> 126m v1.24.6+k3s1
Install Ingress-Nginx.
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.4.0/deploy/static/provider/cloud/deploy.yaml
Check Ingress.
$ kubectl get pod,svc -n ingress-nginx
NAME READY STATUS RESTARTS AGE
pod/ingress-nginx-admission-create-9lbtz 0/1 Completed 0 21m
pod/ingress-nginx-admission-patch-j9hs9 0/1 Completed 1 21m
pod/ingress-nginx-controller-598d7c8b88-hfx7n 1/1 Running 0 21m
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/ingress-nginx-controller-admission ClusterIP 10.43.39.71 <none> 443/TCP 21m
service/ingress-nginx-controller LoadBalancer 10.43.48.244 192.168.0.100,192.168.0.101 80:31710/TCP,443:30835/TCP 21m
Test Cluster
Test Ingress helo world. Create the file `hello.yaml` and populate it with this code:apiVersion: apps/v1
kind: Deployment
metadata:
name: docker-hello-world
labels:
app: docker-hello-world
spec:
selector:
matchLabels:
app: docker-hello-world
replicas: 1
template:
metadata:
labels:
app: docker-hello-world
spec:
containers:
- name: docker-hello-world
image: arm64v8/nginx
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: docker-hello-world-svc
spec:
selector:
app: docker-hello-world
ports:
- port: 8088
targetPort: 80
type: ClusterIP
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: hello-world-ing
annotations:
kubernetes.io/ingress.class: "nginx"
spec:
tls:
- secretName: tls-secret
rules:
- http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: docker-hello-world-svc
port:
number: 8088
Create the resource by entering:
kubectl apply -f hello.yaml
Get status.
$ kubectl get pod,svc,ingress -n default
NAME READY STATUS RESTARTS AGE
pod/docker-hello-world-6bfd85ff8d-jmtvl 1/1 Running 0 53s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.43.0.1 <none> 443/TCP 3h45m
service/docker-hello-world-svc ClusterIP 10.43.143.143 <none> 8088/TCP 53s
NAME CLASS HOSTS ADDRESS PORTS AGE
ingress.networking.k8s.io/hello-world-ing <none> * 192.168.0.100,192.168.0.101 80, 443 53s
Go to http://192.168.0.100
Look good! 🔥 🔥 🔥
