initial commit

NOTES.md

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+# kubectl oneliners 
+These scripts can be used as subcommands for kubectl to serve a specific purpose
+## Installation
+```bash
+sudo cp ./kubectl-* /usr/local/bin/
+```
+
+## Desciption
+### kubectl-resources
+This oneliner shows you the resource limits/requests for pods in a namespace or all namespaces
+
+Usage example: 
+```shell
+# Supports --all-namespaces
+kubectl resources
+```
+### kubectl-containerids
+This oneliner shows you the associated containerids for kubernetes pods. 
+It can be used to debug a container directly on the node. The containerId matches the ID on the node itsself
+
+Usage example:
+```shell
+# Supports --all-namespaces
+kubectl containerids
+```
+### kubectl-geteverything
+This oneliner shows all (and by that it means every resource/cr) in a namespace.
+It requires an argument which is the name of the namespace in question.
+
+It may be used to debug a namespace stuck in terminating state to find out which resources remain.
+
+Usage exmaple:
+```shell
+kubectl geteverything my-namespace
+```
+### kubectl-finalize-namespace
+This is a dangerous script but sometimes necessary to get rid of a namespace which is stuck in Terminating state
+
+**Run this script with extrem caution!**
+
+Usage example:
+```shell
+kubectl finalize namespace some-namespace --yes-i-really-mean-it
+```

commands.txt

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+kubectl get pods --all-namespaces --field-selector spec.nodeName=
+git config --global push.autoSetupRemote true
+select pg_size_pretty(pg_database_size('db_name'));
+stern
+kubectx/kubens

kubectl-containerids

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+#!/bin/sh
+kubectl get pods -o custom-columns="NAMESPACE:.metadata.namespace,POD:.metadata.name,CONTAINER:.spec.containers[*].name,containerIds:.status.containerStatuses[*].containerID" "$@"

kubectl-finalize-namespace

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+#!/bin/bash
+if [ -z "$1" ]; then
+   echo "No argument supplied. You have to supply a namespace you wish to terminate as argument"
+   exit 1
+fi
+if [ "x--yes-i-really-mean-itx" != "x$2x" ]; then
+  echo "Doing nothing... use --yes-i-really-mean-it if you want to run the script"
+  exit 1
+fi
+kubectl get namespace ${1} -o json \
+  | tr -d "\n" | sed "s/\"finalizers\": \[[^]]\+\]/\"finalizers\": []/" \
+  | kubectl replace --raw /api/v1/namespaces/${1}/finalize -f -

kubectl-geteverything

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+#!/bin/bash
+kubectl api-resources --verbs=list --namespaced -o name \
+  | xargs -n 1 kubectl get --show-kind --ignore-not-found -n $@

kubectl-remove-finalizer

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+#!/usr/bin/env bash
+# Removes finalizers from resources
+patch=$(echo -e 'metadata:\n  finalizers: null')
+kubectl patch --patch "${patch}" --type=merge $@

kubectl-resources

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+#!/bin/sh
+kubectl get pods -o custom-columns="NAMESPACE:.metadata.namespace,POD:.metadata.name,CONTAINER:.spec.containers[*].name,REQ_CPU:.spec.containers[*].resources.requests.cpu,LIM_CPU:.spec.containers[*].resources.limits.cpu,REQ_MEM:.spec.containers[*].resources.requests.memory,LIM_CPU:.spec.containers[*].resources.limits.memory" "$@"

node-shell.sh

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+#!/bin/bash
+NODENAME=$1
+cat <<EOF | kubectl apply -f -
+apiVersion: v1
+kind: Pod
+metadata:
+  name: node-shell-${NODENAME}
+  namespace: kube-system
+spec:
+  containers:
+  - name: shell
+    image: "docker.io/alpine:3.9"
+    securityContext:
+      privileged: true
+    command: ["nsenter"]
+    args: ["-t", "1", "-m", "-u", "-i", "-n", "sleep", "14000"]
+  hostIPC: true
+  hostNetwork: true
+  hostPID: true
+  terminationGracePeriodSeconds: 0
+  restartPolicy: Never
+  tolerations:
+    - operator: Exists
+  nodeName: ${NODENAME}
+EOF
+
+sleep 10
+
+kubectl exec -it -n kube-system node-shell-${NODENAME} -- /bin/bash
+
+#kubectl delete pod -n kube-system node-shell-${NODENAME}