From e50bbe4f15f6d203924ea71ae3d6bd89aaf34a27 Mon Sep 17 00:00:00 2001
From: bilbo-b <38690792+bilbo-b@users.noreply.github.com>
Date: Wed, 25 Jan 2023 01:33:13 +0100
Subject: [PATCH] Create multipass-k3s-install.sh

---
 multipass-k3s-install.sh | 90 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 multipass-k3s-install.sh

diff --git a/multipass-k3s-install.sh b/multipass-k3s-install.sh
new file mode 100644
index 0000000..927435d
--- /dev/null
+++ b/multipass-k3s-install.sh
@@ -0,0 +1,90 @@
+# This script sets up VMs running Ubuntu by using multipass (from https://multipass.run) and installs 
+# k3s on them. Please note that it has only been tested on macOS (Ventura) and with 3 VMs
+# It created an environment as described in the first part of the c't course for kubernetes:
+# https://www.heise.de/select/ct/2022/22/2220016192019307305
+export MP="/usr/local/bin/multipass"
+export NAMES="kube1 kube2 kube3"
+export FIRST=true
+if [ ! -x $MP ]
+then
+	echo "$MP is not an executable file. Please make sure multipass is installed and the variable MP is set correctly in the script"
+	if [ `uname` = Darwin ]
+	then
+		cat <<EOF
+
+you may consider if you have not already done so to install homebrew from https://brew.sh
+by running the one line command given on their main page for installation on your Mac
+
+after that you can install e.g.
+
+	brew install --cask multipass # from https://multipass.run
+
+and 
+
+	brew install kubernetes-cli
+
+EOF
+	fi
+	exit 1
+fi
+for NAME in $NAMES
+do
+	$MP list | grep $NAME  >/dev/null
+	if [ $? -eq 0 ]
+	then
+		echo "a VM by the name of $NAME already exists, this script does not know how to handle this:"
+		$MP list
+		exit 1
+	fi
+done
+echo
+echo "VMs will be created running Ubuntu 20.04 LTS, each with 1 CPU, 5GB disk and 512MB mem ..."
+echo
+echo "Names: $NAMES"
+echo 
+for NAME in $NAMES
+do
+	$MP launch focal -n $NAME
+	$MP exec $NAME -- sudo mkdir -p /etc/rancher/k3s/
+	echo 'disable: traefik' >config.yaml
+	$MP transfer config.yaml ${NAME}:
+	$MP exec $NAME sudo cp config.yaml /etc/rancher/k3s/
+	if [ $FIRST = true ]
+	then
+		echo "/usr/bin/curl -sfL https://get.k3s.io | /usr/bin/sh -s - server --cluster-init" >inst_k3s
+		$MP transfer inst_k3s ${NAME}:
+		$MP exec $NAME -- chmod +x /home/ubuntu/inst_k3s
+		$MP exec $NAME -- sudo sh -c /home/ubuntu/inst_k3s
+		sleep 10
+		echo "kubectl get nodes: "
+		$MP exec $NAME -- sudo kubectl get nodes
+		TOKEN=`multipass exec kube1 -- sudo cat /var/lib/rancher/k3s/server/token`
+		IPLAST=`multipass list | grep $NAME | cut -f4 -d"." | cut -d" " -f1`
+		IPADDR="192.168.64.$IPLAST"
+		$MP exec $NAME -- sudo cat /etc/rancher/k3s/k3s.yaml >.kube_config_pre
+		FIRST="false"
+	else 
+		echo "$NAME :"
+                echo "/usr/bin/curl -sfL https://get.k3s.io | K3S_TOKEN=${TOKEN} sh -s - server --server https://${IPADDR}:6443" >inst_k3s
+                $MP transfer inst_k3s ${NAME}:
+                $MP exec $NAME -- chmod +x /home/ubuntu/inst_k3s
+                $MP exec $NAME -- sudo sh -c /home/ubuntu/inst_k3s
+		sleep 10
+		echo "kubectl get nodes: "
+		$MP exec $NAME -- sudo kubectl get nodes
+	fi
+
+done
+echo multipass list
+$MP list | grep -v Stopped
+echo
+perl -pe "s/127.0.0.1/${IPADDR}/" .kube_config_pre >.kube_config
+echo the file .kube_config should be copied/moved to \~/.kube/config for the local configuration of kubectl 
+echo will download first-pod.yml for your convenience as well
+curl -O https://raw.githubusercontent.com/jamct/kubernetes-einstieg/main/part-1/first-pod.yml 2>/dev/null
+echo "done!"
+echo
+echo "to stop the VMs:"
+echo multipass stop $NAMES
+echo "to delete the VMs:"
+echo multipass delete $NAMES ; multipass purge