apt update && apt upgrade -y
curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
Sometimes you want to retrieve EC2 insntances' region information.
You can query that information through instance metadata(169.254.169.254).
$ curl --silent http://169.254.169.254/latest/dynamic/instance-identity/document
{
"privateIp" : "172.31.2.15",
"instanceId" : "i-12341ee8",
"billingProducts" : null,
"instanceType" : "t2.small",