CKAD
kubectl api-resources -o name - Answer- command will list the object types currently available on the cluster
kubectl describe $object_type $object_name - Answer- get information about an object's spec and status
kubectl get pods - Answer- Gets pods currently running (in the default n...
CKAD
kubectl api-resources -o name - Answer- command will list the object types currently
available on the cluster
kubectl describe $object_type $object_name - Answer- get information about an
object's spec and status
kubectl get pods - Answer- Gets pods currently running (in the default namespace)
kubectl get nodes - Answer- gets all nodes currently running in cluster
kubectl get node $node_name - Answer- Gets name, status, version, etc. about
node that is specified
kubectl get node $node_name -o yaml - Answer- Gets very detailed information
about the node that is specified in yaml information defining the object and it's spec
Pods - Answer- The basic building blocks of any application running in kubernetes
Pod - Answer- Consists of one or more containers and a set of resources shared by
those containers. All containers managed by a Kubernetes cluster are part of a POD
kubecutl create -f mypod.yml - Answer- create a pod from the yaml definition file
kubectl apply -f my-pod.yml - Answer- Edit a pod by updating the yaml definition and
reapplying it
kubectl edit pod my-pod - Answer- Edit a pod
kubectl delete pod my-pod - Answer- Delete a pd
kubectl get namespaces - Answer- You can get a list of the namespaces in the
cluster
kubectl create ns namespace_name - Answer- command to create a namespace
namespaces - Answer- virtual cluster that makes it easier to manage environments
with man users across multiple teams or projects
command: ['echo'] - Answer- Under the spec for your container you can specify a
command this way.
args: [" array", "of", "arguments"] - Answer- The command option in specs also takes
an array of arguments (as strings).
, - containerPort: 80 - Answer- Your container may want to network with other
containers. This will require you to specify a port for the container (port 80 in this
example).
config maps - Answer- a k8s object that stores confguration data in a key-value
format. This config data can then be used to configure software running in a
container, by referencing the configMap in the pod spec.
kubectl logs pod_name - Answer- Dumps pod logs to STDOUT
kubectl exec my-pod -- ls / - Answer- Executes a command inside a pod, in this case
"ls /"
resource request - Answer- the amount of resources necessary to run a container
resource limit - Answer- A max value for the resource usage of a container
service accounts - Answer- allow containers running in pods to access the K8s API.
Some apps may need to interact with the cluser itself. This provides a way to let
kubectl create serviceacccount my-serviceaccount - Answer- Command to create a
service account in K8S
serviceAccountName - Answer- Key name for naming a service account.
multi-container pod - Answer- pods with more than one container that al work
together as a single unit. It's typically better to keep them separate, but there are
some uses cases where they can be beneficial.
shareProcessNamespace: true - Answer- With the process namespace sharing
enabled, containers in the same pod can interact with and signal one another's
processes.
sidecar pod pattern - Answer- uses a container that enhances or adds functionality to
the main container in some way. For example, checking if there have been updating
in an external repo and pushing them to the pain container if there have been
changes.
ambassador pod pattern - Answer- Uses a container to accept network traffic and
pass it on to the main container. For example, the container listens on a custom port
and forwards the traffic to the main container on it's hard coded port.
adapter pod pattern - Answer- uses a container to change the output of the main
container in some way (e.g., formats and decorates log output from the main
container).
probes - Answer- Allow you to customize how K8s determines the status of your
containers
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