Setup for labs.play-with-k8s

README.md

From 0 to 100 w/ one command and 4ish minutes, in labs.k8s

tl;dr

1. Click the raw button to get the raw-url of the fig-play-with-k8s.sh-file and, in a VM from labs.play-with-k8s.com,
2. Run bash -x <( curl -L url-to-raw-gist )
3. Copy the "blue-port-url" and change http to https
4. Goto url in Firefox

e.g. bash -x <( curl -L https://gist.github.com/yogeek/e0dc5e16e158815e7bbb77b896cad3c6/raw/fig-play-with-k8s.sh )

What happens?

The script will,

1. Start kubeadm with a dashboard and cluster-admin access from the dashboard
2. Install helpful tools (code-completion, vim, tmux, etc. )
3. Display the kubeadm join-string, to be run on a new instance

Accessing the dashboard

You can now copy the url from the "blue link" in the top, exposing the dashboard on a port, it'll look somewhat like http://ip172-18-0-20-b9q1pplduh0g008cbc3g-30319.direct.labs.play-with-k8s.com/ change the http part to https and access the url from a browser.

NB: I've had problems using Chrome, but Firefox lets me ignore the security issues, and access the dashboard. Clearly it's important to configure security properly, but it's also of negligible importance; I have Firefox installed, this is not a production environment.

But why!?

Because Kubernetes is hard.. and it's nice to get something running quickly and be able to play around with it.. and labs.k8s makes this very easy and fast, but their franela/k8s images are very basic.

More?

Well, I have a tmux config you can also curl onto the machines, to break your fingers a little less. It's located here: gist.github.com/figaw/.tmux.conf

fig-play-with-k8s.sh

#!/bin/bash
## Setup http://labs.play-with-k8s.com/
#
# Inspired heavily by: https://gist.github.com/jjo/78f60702fbfa1cbec7dd865f67a3728a
# Some dev-tools omitted, changes in parenthesis.
#
# Run with:
# bash -x <( curl -L https://gist.github.com/yogeek/e0dc5e16e158815e7bbb77b896cad3c6/raw/fig-play-with-k8s.sh )
#

# Initialize cluster and FIXUP some play-with-k8s annoyances (fixed kube-dashboard shortlink, update port-number)
test -d /etc/kubernetes/pki || (
echo ""
echo "###########################################################################################################"
echo "kubeadm init"
echo "###########################################################################################################"
kubeadm init --apiserver-advertise-address $(hostname -i) | tee ~/kubeadm-init.log
echo ""
echo ""

sleep 20

echo "###########################################################################################################"
echo "Waiting for all deployment except coredns to be ready..."
echo "###########################################################################################################"
required_pods_number=$(kubectl get pods -l k8s-app!=kube-dns -n kube-system --no-headers | wc -l) 
while [[ "$(kubectl get pods -l k8s-app!=kube-dns -n kube-system --field-selector=status.phase==Running --no-headers | wc -l)" != "${required_pods_number}" ]]; do 
  echo "waiting system pods to be ready..."
  sleep 2
done

echo ""
echo "###########################################################################################################"
echo "apply weave cni"
echo "###########################################################################################################"
kubectl apply -n kube-system -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 -w0)"
echo ""
echo ""
echo "###########################################################################################################"
echo "waiting weave pods to be ready..."
echo "###########################################################################################################"
weave_pods_number=$(kubectl get pods -l k8s-app==kube-dns -n kube-system --no-headers | wc -l) 
while [[ "$(kubectl get pods -l k8s-app==kube-dns -n kube-system --field-selector=status.phase==Running --no-headers | wc -l)" != "${weave_pods_number}" ]]; do 
  echo "waiting system pods to be ready..."
  sleep 2
done
echo ""
echo ""
echo "###########################################################################################################"
echo "authorize pod schedulation on master"
echo "###########################################################################################################"
kubectl taint nodes --all node-role.kubernetes.io/master-
echo ""
echo "###########################################################################################################"
echo "apply dashboard"
echo "###########################################################################################################"
curl -L -s https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml | sed 's/targetPort: 8443/targetPort: 8443\n  type: LoadBalancer/' | kubectl apply -f -
kubectl create -f https://gist.githubusercontent.com/figaw/17dc8ed72c8d2fe1a12682beb9c1e57e/raw/e2c472cab2aa2ffb410999bcdbd158aa7617d9a3/service-account.yaml
# add Google's 8.8.8.8 dns
#kubectl get deployment --namespace=kube-system kube-dns -oyaml|sed -r 's,(.*--server)=(/ip6.arpa/.*),&\n\1=8.8.8.8,'|kubectl apply -f -
# add service account to dashboard, from https://gist.github.com/figaw/17dc8ed72c8d2fe1a12682beb9c1e57e
# this gives anyone with access to the dashboard the cluster-admin role.. so.. clearly this is for development.
)

echo ""
echo "###########################################################################################################"
echo "# k8s comfy'ness"
echo "###########################################################################################################"
echo ""
cd
yum -y install bash-completion git-core tmux vim wget sudo which openssl
source /etc/profile.d/bash_completion.sh
kubectl completion bash > /etc/bash_completion.d/kubectl.completion
source /etc/bash_completion.d/kubectl.completion
kubeadm completion bash > /etc/bash_completion.d/kubeadm.completion
source /etc/bash_completion.d/kubeadm.completion

echo ""
echo "###########################################################################################################"
echo "Install Helm"
echo "###########################################################################################################"
echo ""
curl https://raw.githubusercontent.com/helm/helm/master/scripts/get > get_helm.sh
chmod +x ./get_helm.sh
./get_helm.sh
helm init
helm repo update
echo ""
# show kubeadm join ...
echo ""
echo "###########################################################################################################"
echo "* Join nodes with:"
kubeadm token create --print-join-command
echo "###########################################################################################################"
echo ""
# (master shouldn't join
# kubeadm join --token $(kubeadm token list |sed -n 2p|egrep -o '^\S+') $(sed -rn s,.*server:.*//,,p /etc/kubernetes/admin.conf)
echo ""