mikejoh · March 13, 2024 08:02 · Jan 16, 2020 · Jan 16, 2020 · Jan 16, 2020 · Sep 24, 2018
diff --git a/kubectl-one-liners.md b/kubectl-one-liners.md
@@ -34,6 +34,7 @@ kubectl label pod POD that=thing
 Select pods based on selector across all namespaces:
 ```
 kubectl get pods --all-namespaces --selector this=label
+kubectl get pods --all-namespaces -l this=label
 ```
 Create a single Pod without a Deployment (`--restart=Never`) and a ReplicaSet:
 ```

diff --git a/kubectl-one-liners.md b/kubectl-one-liners.md
@@ -61,4 +61,8 @@ kubectl patch deployment nginx -p '{"spec":{"template":{"spec":{"containers":[{
 Sort Kubernetes events on creation timestamp:
 ```
 kubectl get events --sort-by=.metadata.creationTimestamp
+```
+Output the number of Pods `foo` and skip Pods `bar` that are running per node:
+```
+kubectl get pods -o wide | grep foo | grep Running | grep -v bar | awk '{print $7}' | sort | uniq -c | sort -nr | wc -l
 ```
diff --git a/kubectl-one-liners.md b/kubectl-one-liners.md
@@ -1 +1,64 @@
-kubectl get events --sort-by=.metadata.creationTimestamp
+# kubectl one-liners
+
+Enable `kubectl` completion (needs the `bash-completion` package):
+```
+source <(kubectl completion bash)
+```
+Dry-run, outputs Service (--expose) and a Deployment in yaml:
+```
+kubectl run --image=apache \ 
+--port=80 \
+--replicas=3 \
+--restart='Always' \
+--expose \
+--requests='cpu=100m,memory=256Mi' \
+--limits='cpu=200m,memory=512Mi' \
+--labels=app=apache,version=1 \
+--dry-run=true \
+-o yaml
+```
+In a running container run `date`:
+```
+kubectl exec POD -- bash -c "date"
+kubectl exec POD -- date
+kubectl exec POD date
+```
+Remove label `this` from a pod:
+```
+kubectl label pod POD this-
+```
+Add label `that=thing` to a pod:
+```
+kubectl label pod POD that=thing
+```
+Select pods based on selector across all namespaces:
+```
+kubectl get pods --all-namespaces --selector this=label
+```
+Create a single Pod without a Deployment (`--restart=Never`) and a ReplicaSet:
+```
+kubectl run nginx --image=nginx --restart=Never
+```
+Create a single Pod with a Deployment (and a ReplicaSet):
+```
+kubectl run nginx --image=nginx --replicas=1
+```
+How the `--restart` flag behaves with `kubectl run`:
+```
+--restart=Never     Creates a single Pod without a Deployment or a ReplicaSet. You can achive this by creating a single Pod manifest and apply it.
+--restart=OnFailure Creates a Pod and a Job.
+--restart=Always    Default, creates a Deployment and a ReplicaSet object.
+```
+Copy file to/from a Pod:
+```
+kubectl cp POD:/path/to/file.txt ./file.txt
+kubectl $HOME/file.txt POD:/path/to/file.txt
+```
+Patch a Deployment with a new image:
+```
+kubectl patch deployment nginx -p '{"spec":{"template":{"spec":{"containers":[{ "name":"nginx", "image":"nginx:1.13.1"}]}}}}'
+```
+Sort Kubernetes events on creation timestamp:
+```
+kubectl get events --sort-by=.metadata.creationTimestamp
+```
diff --git a/kubectl-one-liners.md b/kubectl-one-liners.md
@@ -0,0 +1 @@
+kubectl get events --sort-by=.metadata.creationTimestamp
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		kubectl get events --sort-by=.metadata.creationTimestamp