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Docker Certified Associate (DCA) Exam Sample Questions (Q174-Q179):
NEW QUESTION # 174
Will this command list all nodes in a swarm cluster from the command line?
Solution. 'docker inspect nodes
Answer: A
Explanation:
The command docker inspect nodes will not list all nodes in a swarm cluster from the command line. This is because docker inspect requires one or more names or IDs of the objects to inspect1. To list all nodes in a swarm cluster, you need to use the command docker node ls2, which will display information such as node ID, hostname, status, availability, and role3. References:
* docker inspect | Docker Docs
* docker node ls | Docker Docs
* How to list nodes in a Docker swarm cluster
NEW QUESTION # 175
In the context of a swarm mode cluster, does this describe a node?
Solution: an instance of the Docker engine participating in the swarm
Answer: B
Explanation:
In the context of a swarm mode cluster, an instance of the Docker engine participating in the swarm is indeed a node1. A node can be either a manager or a worker, depending on the role assigned by the swarm manager2. A manager node handles the orchestration and management of the swarm, while a worker node executes the tasks assigned by the manager2. A node can join or leave a swarm at any time, and the swarm manager will reconcile the desired state of the cluster accordingly1. Reference:
1: Swarm mode overview | Docker Docs
2: Manage nodes in a swarm | Docker Docs
NEW QUESTION # 176
During development of an application meant to be orchestrated by Kubernetes, you want to mount the /data directory on your laptop into a container.
Will this strategy successfully accomplish this?
Solution: Create a PersistentVolume with storageciass: "" and hostPath: /data, and a persistentVolumeClaim requesting this PV. Then use that PVC to populate a volume in a pod
Answer: B
NEW QUESTION # 177
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods --all-namespaces -I env=development'
Answer: A
Explanation:
The command 'kubectl get pods --all-namespaces -I env=development' does not display all the pods in the cluster that are labeled as 'env: development'. The reason is that the flag -I is not a valid option for kubectl get pods. The correct flag to use is --selector or -l, which allows you to filter pods by labels1. Labels are key-value pairs that can be attached to Kubernetes objects to identify, group, or select them2. For example, to label a pod with env=development, one can run:
kubectl label pods my-pod env=development
To display all the pods that have the label env=development, one can run:
kubectl get pods --selector env=development
or
kubectl get pods -l env=development
The --all-namespaces flag can be used to list pods across all namespaces3. Therefore, the correct command to display all the pods in the cluster that are labeled as 'env: development' is:
kubectl get pods --all-namespaces --selector env=development
or
kubectl get pods --all-namespaces -l env=development Reference:
kubectl Cheat Sheet | Kubernetes
Labels and Selectors | Kubernetes
kubectl get | Kubernetes
NEW QUESTION # 178
Will this command display a list of volumes for a specific container?
Solution: 'docker container inspect nginx'
Answer: B
Explanation:
Explanation
This command will display a list of volumes for a specific container, because it uses docker container inspect to show detailed information about a container, including its volumes. According to the official documentation, docker container inspect will show the Mounts section that contains information about all volumes mounted by the container.
References: https://docs.docker.com/engine/reference/commandline/container_inspect/
https://docs.docker.com/storage/volumes/#start-a-container-with-a-volume
NEW QUESTION # 179
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