fix k8s apt repository key and URL. (#46)

* fix k8s apt repository key and URL.

Signed-off-by: Tomoya.Fujita <tomoya.fujita825@gmail.com>

* indent fixes.

Signed-off-by: Tomoya.Fujita <tomoya.fujita825@gmail.com>

---------

Signed-off-by: Tomoya.Fujita <tomoya.fujita825@gmail.com>

scripts/install_k8s_packages.sh

@@ -5,7 +5,7 @@
 set -e
 
 ### User Setting
-KUBERNETES_VERSION=1.26.9-00
+KUBERNETES_VERSION=v1.26
 
 ### Confirmation to install all dependent packages
 
@@ -62,10 +62,13 @@ function install_container_runtime () {
 
 function install_kubernetes () {
 	trap exit_trap ERR
-	apt install -y apt-transport-https curl
-	curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add
-	apt-add-repository -y "deb http://apt.kubernetes.io/ kubernetes-xenial main"
-	apt install -y --allow-downgrades kubeadm=$KUBERNETES_VERSION kubelet=$KUBERNETES_VERSION kubectl=$KUBERNETES_VERSION
+	apt remove -y --allow-change-held-packages kubelet kubectl kubeadm
+	apt install -y apt-transport-https ca-certificates curl
+	curl -fsSL https://pkgs.k8s.io/core:/stable:/$KUBERNETES_VERSION/deb/Release.key | gpg --yes --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
+	echo "deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/$KUBERNETES_VERSION/deb/ /" | tee /etc/apt/sources.list.d/kubernetes.list
+	apt update -y
+	apt install -y kubelet kubeadm kubectl
+	apt-mark hold kubelet kubeadm kubectl
 	kubeadm version
 	### kubectl version will try to access server that leads to error to exit this script
 	kubectl version --client