@dictcp (https://dictcp.men)

Session at HKOSCon 2020: https://hkoscon.org/2020/topics/automating-kubernetes-gitops

Slide: https://docs.google.com/presentation/d/1rA6bhCGMydP-NOmFu7fv0zbBSzGvK9GLn63H8dHLP2g

• Hands-on Preparation
• Install k3s Kubernetes on your VM
• Install Helm & fluxctl
• [Prepare the git repository for GitOps](#Prepare the git repository for GitOps)
• Install fluxcd
• fluxcd playaround
• Install Helm operator
• Helm operator playaround

You need

• a GitHub account (to access this material and setup gitops flow)
• a working Kubernetes in the hands-on session (to s)
  • multipass VM (local installation, recommended)
  • [DigitalOcean VM] (remote installation)

1. Install multipass on https://multipass.run

• support Windows 10 Pro+, Mac OS X, Linux
• Mac OS X (with homebrew installed): brew cask install multipass
• Ubuntu (or any Linux distro with snap installed): sudo snap install multipass --classic

2. Start Command prompt / Terminal
3. Execute multipass launch -d 30G -m 2G --name fluxcd-workshop 18.04
4. Depends on network condition, you need to wait for 5-20 mins.
5. Execute multipass shell fluxcd-workshop to obtain shell in the VMs

2. Execute curl -sfL https://get.k3s.io | sh - in the VM
3. Depends on network condition, you need to wait for 5-10 mins.
4. You should have your local Kubernetes cluster installed. To verify, execute sudo -i k3s kubectl get nodes, it should give you something like

NAME              STATUS   ROLES    AGE     VERSION
fluxcd-workshop   Ready    master   5m53s   v1.18.3+k3s1`

5. Make sure the cluster setup is avaiable by the following commands:

$ mkdir .kube
$ sudo cat /etc/rancher/k3s/k3s.yaml > .kube/config

Normally you can install helm and fluxctl with the following 2 commands:

sudo snap install kubectl --classic
sudo snap install helm --classic --channel=3.0/stable
sudo snap install fluxctl --classic

• Helm

$ curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
$ chmod 700 get_helm.sh
$ ./get_helm.sh
$ helm version
version.BuildInfo{Version:"v3.2.3", GitCommit:"8f832046e258e2cb800894579b1b3b50c2d83492", GitTreeState:"clean", GoVersion:"go1.13.12"}

• fluxctl

wget -O fluxctl https://github.com/fluxcd/flux/releases/download/1.19.0/fluxctl_linux_amd64
chmod +x fluxctl
sudo mv fluxctl /usr/local/bin/

1. Fork https://github.com/dictcp/flux-get-started in GitHub to your own account

1. Setup the chart repository for flux helm repo add fluxcd https://charts.fluxcd.io

2. Install flux on Kubernetes cluster via Helm, with following commands

$ export GHUSER="dictcp"

$ kubectl create ns flux
$ helm upgrade -i flux fluxcd/flux \
--git-path=namespaces,workloads \
--namespace flux \
--set git.url=git@github.com:${GHUSER}/stackfiles

3. Copy the public SSH key

fluxctl identity --k8s-fwd-ns flux

4. Setup in GitHub

5. Trigger

fluxctl sync --k8s-fwd-ns flux

6. View the applied change

kubectl get

1. Install the CRD for HelmRelease

kubectl apply -f https://raw.githubusercontent.com/fluxcd/helm-operator/1.1.0/deploy/crds.yaml

2. Install Helm Operator via Helm

helm upgrade -i helm-operator fluxcd/helm-operator \
--set git.ssh.secretName=flux-git-deploy \
--set helm.versions=v3 \
--namespace flux