File kubectl-node-shell-1.10.1.obscpio of Package kubectl-node-shell

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File kubectl-node-shell-1.10.1.obscpio of Package kubectl-node-shell

07070100000000000081A400000000000000000000000165ADB8C200002C5D000000000000000000000000000000000000002200000000kubectl-node-shell-1.10.1/LICENSE                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

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07070100000001000081A400000000000000000000000165ADB8C2000009D3000000000000000000000000000000000000002400000000kubectl-node-shell-1.10.1/README.md# kubectl node-shell
*(formerly known as **kubectl-enter**)*

Start a root shell in the node's host OS running. Uses an alpine pod with nsenter for Linux nodes and a [HostProcess pod](https://kubernetes.io/docs/tasks/configure-pod-container/create-hostprocess-pod/) with PowerShell for Windows nodes.

![demo](https://gist.githubusercontent.com/kvaps/2e3d77975a844654ec297893e21a0829/raw/c778a8405ff8c686e4e807a97e9721b423e7208f/kubectl-node-shell.gif)

## Installation

using [krew](https://krew.sigs.k8s.io/):

<pre>
kubectl krew index add kvaps <a href="https://github.com/kvaps/krew-index">https://github.com/kvaps/krew-index</a>
kubectl krew install kvaps/node-shell
</pre>

or using curl:

```bash
curl -LO https://github.com/kvaps/kubectl-node-shell/raw/master/kubectl-node_shell
chmod +x ./kubectl-node_shell
sudo mv ./kubectl-node_shell /usr/local/bin/kubectl-node_shell
```

## Usage

```bash
# Get standard bash shell
kubectl node-shell <node>

# Use X-mode (mount /host, and do not enter host namespace)
kubectl node-shell -x <node>

# Execute custom command
kubectl node-shell <node> -- echo 123

# Use stdin
cat /etc/passwd | kubectl node-shell <node> -- sh -c 'cat > /tmp/passwd'

# Run oneliner script
kubectl node-shell <node> -- sh -c 'cat /tmp/passwd; rm -f /tmp/passwd'
```

## X-mode

X-mode can be useful for debugging minimal systems that do not have a built-in shell (eg. Talos).  
Here's an example of how you can debug the network for a rootless kube-apiserver container without a filesystem:

```bash
kubectl node-shell -x <node>

# Download crictl
wget https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.28.0/crictl-v1.28.0-linux-amd64.tar.gz -O- | \
  tar -xzf- -C /usr/local/bin/

# Setup CRI endpoint
export CONTAINER_RUNTIME_ENDPOINT=unix:///host/run/containerd/containerd.sock

# Find your container
crictl ps | grep kube-apiserver
#3ff4626a9f10e       e7972205b6614       6 hours ago         Running             kube-apiserver         0                   215107b47bd7e       kube-apiserver-talos-rzq-nkg

# Find pid of the container
crictl inspect 3ff4626a9f10e | grep pid
#    "pid": 2152,
#            "pid": 1
#            "type": "pid"
#                "getpid",
#                "getppid",
#                "pidfd_open",
#                "pidfd_send_signal",
#                "waitpid",

# Go to network namespace of the pid, but keep mount namespace of the debug container
nsenter -t 2152 -n
```

*You need to be able to start privileged containers for that.*
07070100000002000081ED00000000000000000000000165ADB8C200001330000000000000000000000000000000000000002D00000000kubectl-node-shell-1.10.1/kubectl-node_shell#!/usr/bin/env sh
set -e

kubectl=kubectl
version=1.10.0
generator=""
node=""
nodefaultctx=0
nodefaultns=0
container_cpu="${KUBECTL_NODE_SHELL_POD_CPU:-100m}"
container_memory="${KUBECTL_NODE_SHELL_POD_MEMORY:-256Mi}"
volumes="[]"
volume_mounts="[]"
x_mode=0
labels="${KUBECTL_NODE_SHELL_LABELS}"
pod_running_timeout="${KUBECTL_NODE_SHELL_POD_RUNNING_TIMEOUT:-1m}"

if [ -t 0 ]; then
  tty=true
else
  tty=false
fi
while [ $# -gt 0 ]; do
  key="$1"

case $key in
  -v | --version)
    echo "kubectl-node-shell $version"
    exit 0
    ;;
  --context)
    nodefaultctx=1
    kubectl="$kubectl --context $2"
    shift
    shift
    ;;
  --kubecontext=*)
    nodefaultctx=1
    kubectl="$kubectl --context=${key##*=}"
    shift
    ;;
  --kubeconfig)
    kubectl="$kubectl --kubeconfig $2"
    shift
    shift
    ;;
  --kubeconfig=*)
    kubectl="$kubectl --kubeconfig=${key##*=}"
    shift
    ;;
  -n | --namespace)
    nodefaultns=1
    kubectl="$kubectl --namespace $2"
    shift
    shift
    ;;
  --namespace=*)
    nodefaultns=1
    kubectl="$kubectl --namespace=${key##*=}"
    shift
    ;;
  -x)
    x_mode=1
    volumes='[{"hostPath":{"path":"/","type":""},"name":"host-root"}]'
    volume_mounts='[{"mountPath":"/host","name":"host-root"}]'
    shift
    ;;
  --)
    shift
    break
    ;;
  *)
    if [ -z "$node" ]; then
      node="${1#node/}"
      shift
    else
      echo "exactly one node required"
      exit 1
    fi
    ;;
  esac
done

if [ -z "$node" ]; then
  echo "Please specify node name"
  exit 1
fi

if [ -z "$KUBERNETES_PORT" ]; then
  # Set the default context and namespace to avoid situations where the user switch them during the build process
  [ "$nodefaultctx" = 1 ] || kubectl="$kubectl --context=$(${kubectl} config current-context)"
  [ "$nodefaultns" = 1 ] || kubectl="$kubectl --namespace=$(${kubectl} config view --minify --output 'jsonpath={.contexts..namespace}')"
fi

# Check the node and retrieve the node OS label
os="$($kubectl get node $node -o jsonpath="{.metadata.labels.kubernetes\.io/os}" || exit 1)"

# Set pod configuration per operating system
if [ "$os" = "windows" ]; then
  image="${KUBECTL_NODE_SHELL_IMAGE_WINDOWS:-mcr.microsoft.com/oss/kubernetes/windows-host-process-containers-base-image:v1.0.0}"
  name="pwsh"
  pod="${name}-$(env LC_ALL=C tr -dc a-z0-9 </dev/urandom | head -c 6)"
  cmd_start='"cmd.exe", "/c", "powershell.exe", "-nol"'
  cmd_arg_prefix=', "-Command"'
  cmd_default=''
  security_context='{"privileged":true,"windowsOptions":{"hostProcess":true,"runAsUserName":"NT AUTHORITY\\SYSTEM"}}'
else # If the OS isn't windows, assume linux
  image="${KUBECTL_NODE_SHELL_IMAGE:-docker.io/library/alpine}"
  name="nsenter"
  pod="${name}-$(env LC_ALL=C tr -dc a-z0-9 </dev/urandom | head -c 6)"
  cmd_start='"nsenter", "--target", "1", "--mount", "--uts", "--ipc", "--net", "--pid"'
  cmd_arg_prefix=', "--"'
  cmd_default=', "bash", "-l"'
  security_context='{"privileged":true}'
fi

# Build the container command
if [ $# -gt 0 ]; then
  if [ "$x_mode" -eq 1 ]; then
    cmd='['
  else
    cmd="[ $cmd_start $cmd_arg_prefix,"
  fi
  c=""
  while [ $# -gt 0 ]; do
    cmd="${cmd}${c} \"$(echo "$1" | \
      awk '{gsub(/["\\]/,"\\\\&");gsub(/\x1b/,"\\u001b");printf "%s",last;last=$0"\\n"} END{print $0}' \
    )\""
    c=,
    shift
  done
  cmd="$cmd ]"
else
  if [ "$x_mode" = 1 ]; then
    cmd='null'
  else
    cmd="[ $cmd_start $cmd_default ]"
  fi
fi

# test if resource specification is required
resources_json='"resources": {
          "limits":   { "cpu": "'${container_cpu}'", "memory": "'${container_memory}'" },
          "requests": { "cpu": "'${container_cpu}'", "memory": "'${container_memory}'" }
        }'
$kubectl run --image "$image" "$pod" --dry-run=server 2>&1 | grep -q 'failed quota' || resources_json='"resources": {}'

overrides="$(
cat <<EOT
{
  "spec": {
    "nodeName": "$node",
    "hostPID": true,
    "hostNetwork": true,
    "containers": [
      {
        "securityContext": $security_context,
        "image": "$image",
        "name": "$name",
        "stdin": true,
        "stdinOnce": true,
        "tty": $tty,
        "command": $cmd,
        $resources_json,
        "volumeMounts": $volume_mounts
      }
    ],
    "tolerations": [
      { "key": "CriticalAddonsOnly", "operator": "Exists" },
      { "effect": "NoExecute",       "operator": "Exists" }
    ],
    "volumes": $volumes
  }
}
EOT
)"
# Support Kubectl <1.18
m=$(kubectl version --client -o yaml | awk -F'[ :"]+' '$2 == "minor" {print $3+0}')
if [ "$m" -lt 18 ]; then
  generator="--generator=run-pod/v1"
fi

trap "EC=\$?; $kubectl delete pod --wait=false $pod >&2 || true; exit \$EC" EXIT INT TERM

echo "spawning \"$pod\" on \"$node\"" >&2
$kubectl run --image "$image" --restart=Never --overrides="$overrides" --labels="$labels" --pod-running-timeout="$pod_running_timeout" $([ "$tty" = true ] && echo -t) -i "$pod" $generator
07070100000003000081ED00000000000000000000000165ADB8C200000352000000000000000000000000000000000000002200000000kubectl-node-shell-1.10.1/test.sh#!/bin/bash
run_test() {
  local name=$1
  local node=$2
  local script=$3
  echo "==== test: $1 (node: $2) ===="

local expected="$(mktemp)"
  local got="$(mktemp)"

if diff --strip-trailing-cr -u <(sh -c "$script") <(set -x; ./kubectl-node_shell $node -- sh -c "$script"); then
    echo -e "Result: \e[42mPASS\e[49m"
  else
    echo -e "Result: \e[101mFAIL\e[49m"
  fi

rm -f "$expected" "$got"
}

if [ -z $1 ]; then
  echo "please specify node in first argument" >&2
  exit -1
fi

case=()

case[1]=$(cat <<\EOT
echo $(echo "
hello everybody
I'm a \"baby seal\""

)
EOT
)

case[2]=$(cat <<\EOT

echo "ggg

ttt"
EOT
)

case[3]=$(cat <<\EOT
echo $(echo "
hello everybody
I'm a \"baby seal

really really

\""
)
EOT
)

case[4]="$(echo -e echo "\e[42mHOLA\e[49m")"

for i in $(seq 1 ${#case[@]}); do
  run_test "case $i" "$1" "${case[$i]}"
done
07070100000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000B00000000TRAILER!!!40 blocks

Places

File kubectl-node-shell-1.10.1.obscpio of Package kubectl-node-shell

Places