dotfiles/home/.bin/kube-ssh

81 lines
2.0 KiB
Plaintext
Raw Normal View History

#!/usr/bin/env bash
source .utils
NAMESPACE="$(kubectl config view --minify --output 'jsonpath={..namespace}' &>/dev/null)"
set -e
NAMESPACE=${NAMESPACE:-default}
POD="kube-ssh"
NODE=""
IMAGE="alpine"
print_usage() {
blue "kube-ssh - gain access to a Kubernetes host node (ssh-like for when a host doesn't have ssh)"
echo " "
underline "Usage:"
echo "kube-ssh [options]"
echo " "
underline "Options:"
echo "-h, --help show this help text"
echo "-n, --namespace the namespace to launch the pod in"
echo "-N, --node the name of the node to access"
echo "-i, --image the image to launch for debugging (default: alpine)"
}
while test $# -gt 0; do
case "$1" in
-n|--namespace)
shift
NAMESPACE=$1
shift
;;
-N|--node)
shift
NODE=$1
shift
;;
-i|--image)
shift
IMAGE=$1
shift
;;
-h|--help)
print_usage
exit 0
;;
*)
break
;;
esac
done
if [[ "$NODE" == "" ]]; then
if [ -z "$(which fzf)" ]; then
NODES=$(kubectl get nodes --no-headers -o custom-columns=name:.metadata.name)
i=0
while read -r node; do
echo "[$i] - $node"
i=$((i+1))
done <<< "$NODES"
read -p "Which node would you like to connect to? " -r
echo ""
IFS=$'\n' NODES=($NODES)
NODE=${NODES[$REPLY]}
else
NODES=$(kubectl get nodes)
NODE=$(echo "$NODES" | _fzf | awk '{print $1}')
fi
fi
SERVER_VERSION=$(kubectl version --client=false -o json 2>/dev/null | jq -r '.serverVersion.minor')
if [ ${SERVER_VERSION} -ge 22 ]; then
kubectl debug node/${NODE} -it --image ${IMAGE}
else
NODE_NAME=$(kubectl get node $NODE -o template --template='{{index .metadata.labels "kubernetes.io/hostname"}}')
NODE_SELECTOR='"nodeSelector": { "kubernetes.io/hostname": "'${NODE_NAME}'" },'
kubectl run --namespace ${NAMESPACE} $POD --rm -it --image ${IMAGE} --privileged --overrides '{"spec":{'"${NODE_SELECTOR}"'"hostPID": true}}' --command nsenter -- --mount=/proc/1/ns/mnt -- /bin/bash
fi