In this post we will understand how to get a working kubernetes instance on your mac (or other development machine
Step 1: Install multipass
Multipass is a lightweight VM manager Linux, windows and Mac. It is useful for creating a Ubuntu sandbox quickly without VirtualBox, Parallels or other VM managers.
❯ brew install multipass
Running `brew update --preinstall`...
==> Downloading https://github.com/canonical/multipass/releases/download/v1.9.0/multipass-1.9.0+mac-Darwin.pkg
==> Downloading from https://objects.githubusercontent.com/github-production-release-asset-2e65be/114128199/8e737c39-9608-4e94-a230-641237a83b7a?X-Amz
######################################################################## 100.0%
==> Installing Cask multipass
==> Running installer for multipass; your password may be necessary.
Package installers may write to any location; options such as `--appdir` are ignored.
Password:
installer: Package name is multipass
installer: Installing at base path /
installer: The install was successful.
🍺 multipass was successfully installed!
❯ multipass version
multipass 1.9.0+mac
multipassd 1.9.0+mac
Step 2: Launch a Ubuntu VM instance
❯ multipass launch --name k3s-demo --cpus 2 --mem 4g --disk 20g
Launched: k3s-demo
❯ multipass info k3s-demo
Name: k3s-demo
State: Running
IPv4: 192.168.64.3
Release: Ubuntu 20.04.4 LTS
Image hash: 147e0cea207e (Ubuntu 20.04 LTS)
Load: 0.90 0.26 0.09
Disk usage: 1.3G out of 19.2G
Memory usage: 158.4M out of 3.8G
Mounts: --
Step 3: Install k3s
❯ multipass exec k3s-demo -- bash -c "curl -sfL https://get.k3s.io | K3S_KUBECONFIG_MODE="644" sh -"
[INFO] Finding release for channel stable
[INFO] Using v1.23.6+k3s1 as release
[INFO] Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.23.6+k3s1/sha256sum-arm64.txt
[INFO] Downloading binary https://github.com/k3s-io/k3s/releases/download/v1.23.6+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/systemd/system/k3s.service.env
[INFO] systemd: Creating service file /etc/systemd/system/k3s.service
[INFO] systemd: Enabling k3s unit
Created symlink /etc/systemd/system/multi-user.target.wants/k3s.service → /etc/systemd/system/k3s.service.
[INFO] systemd: Starting k3s
Step 4: Configure k3s to be used from host
# Get the instance IP
❯ K3S_IP=$(multipass info k3s-demo | grep IPv4 | awk '{print $2}')
❯ echo $K3S_IP
192.168.64.3
# Get the admin yaml
❯ multipass exec k3s-demo sudo cat /etc/rancher/k3s/k3s.yaml > ${HOME}/k3s.conf
# Update the IP address to the one mapped by multipass
❯ sed -i "s/127.0.0.1/${K3S_IP}/" ${HOME}/k3s.conf
❯ chmod 600 ${HOME}/k3s.conf
Step 5: Verify that everything works
❯ export KUBECONFIG=${HOME}/k3s.conf
❯ kubectl get nodes
NAME STATUS ROLES AGE VERSION
k3s-demo Ready control-plane,master 13m v1.23.6+k3s1
❯ kubectl run test-pod --image=nginx --restart=Never
pod/test-pod created
❯ kubectl get pods
NAME READY STATUS RESTARTS AGE
test-pod 1/1 Running 0 88s
❯ kubectl expose pod/test-pod --port=80 --type=NodePort
service/test-pod exposed
❯ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
kubernetes ClusterIP 10.43.0.1 <none> 443/TCP 25m <none>
test-pod NodePort 10.43.73.25 <none> 80:31388/TCP 5s run=test-pod
❯ curl -I ${K3S_IP}:31388
HTTP/1.1 200 OK
Server: nginx/1.21.6
Date: Thu, 26 May 2022 07:17:02 GMT
Content-Type: text/html
Content-Length: 615
Last-Modified: Tue, 25 Jan 2022 15:03:52 GMT
Connection: keep-alive
ETag: "61f01158-267"
Accept-Ranges: bytes
multipass housekeeping
- List all instances
❯ multipass list
Name State IPv4 Image
k3s-demo Running 192.168.64.3 Ubuntu 20.04 LTS
k3s-demo2 Running 192.168.64.4 Ubuntu 20.04 LTS
- Delete an instance
❯ multipass delete k3s-demo2
- Purge and recover resources from deleted instances
❯ multipass purge
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