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Docker Certified Associate (DCA) Exam Sample Questions (Q180-Q185):

NEW QUESTION # 180
One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: The controller managing the pod is autoscaled back to delete the unhealthy pod and alleviate load.

A. No
B. Yes

Answer: A

Explanation:
= The livenessProbe is a mechanism that checks if the container is alive and healthy, and restarts it if it fails1. The orchestrator is the component that manages the deployment and scaling of containers across a cluster of nodes2. The action taken by the orchestrator to fix the unhealthy container is not to autoscale back and delete the pod, but to recreate the pod on the same or a different node3. This ensures that the desired number of replicas for the pod is maintained, and that the pod can resume its normal operation. Autoscaling back and deleting the pod would reduce the availability and performance of the service, and would not necessarily alleviate the load.
:
Configure Liveness, Readiness and Startup Probes | Kubernetes
What is a Container Orchestrator? | Docker
Pod Lifecycle | Kubernetes
I hope this helps you understand the concept of livenessProbe and orchestrator, and how they work with Docker and Kubernetes. If you have any other questions related to Docker, please feel free to ask me.

NEW QUESTION # 181
Is this a type of Linux kernel namespace that provides container isolation?
Solution. Host

A. No
B. Yes

Answer: A

Explanation:
= Host is not a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources while another set of processes sees a different set of resources1. There are eight kinds of namespaces available: Mount, Process, User, Network, UTS, IPC, Cgroup, and Time1. Host is a parameter that can be used to run a container in the host's network namespace, which means the container shares the same network interfaces and configuration as the host2. References:
* Linux namespaces - Wikipedia
* Network settings | Docker Documentation

NEW QUESTION # 182
You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Mount the configuration file directly into the appropriate pod and container using the .spec.containers.configMounts key.

A. No
B. Yes

Answer: A

Explanation:
The solution given is not a valid way to provide a configuration file to a container at runtime using Kubernetes tools and steps. The reason is that there is no such key as .spec.containers.configMounts in the PodSpec. The correct key to use is .spec.containers.volumeMounts, which specifies the volumes to mount into the container's filesystem1. To use a ConfigMap as a volume source, one needs to create a ConfigMap object that contains the configuration file as a key-value pair, and then reference it in the .spec.volumes section of the PodSpec2. A ConfigMap is a Kubernetes API object that lets you store configuration data for other objects to use3. For example, to provide a nginx.conf file to a nginx container, one can do the following steps:
Create a ConfigMap from the nginx.conf file:
kubectl create configmap nginx-config --from-file=nginx.conf
Create a Pod that mounts the ConfigMap as a volume and uses it as the configuration file for the nginx container:
apiVersion: v1
kind: Pod
metadata:
name: nginx-pod
spec:
containers:
- name: nginx
image: nginx
volumeMounts:
- name: config-volume
mountPath: /etc/nginx/nginx.conf
subPath: nginx.conf
volumes:
- name: config-volume
configMap:
name: nginx-config
:
Configure a Pod to Use a Volume for Storage | Kubernetes
Configure a Pod to Use a ConfigMap | Kubernetes
ConfigMaps | Kubernetes

NEW QUESTION # 183
You want to create a container that is reachable from its host's network.
Does this action accomplish this?
Solution.Use network connect to access the container on the bridge network.

A. No
B. Yes

Answer: A

Explanation:
Explanation
= Using network connect to access the container on the bridge network does not accomplish creating a container that is reachable from its host's network. The network connect command connects a container to an existing network, but it does not expose the container's ports to the host1. The bridge network is the default network that Docker creates for containers, and it provides isolation from the host network2. To create a container that is reachable from its host's network, you need to use the host network driver, which disables network isolation and uses the host's network stack directly3. Alternatively, you can use the port mapping feature to publish specific ports of the container to the host4. References:
* docker network connect | Docker Docs
* Bridge network driver | Docker Docs
* Host network driver | Docker Docs
* Publish ports on the host | Docker Docs

NEW QUESTION # 184
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: user

A. No
B. Yes

Answer: B

Explanation:
Explanation
user is a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. According to the official documentation, user namespace support must be explicitly enabled in two ways:
The dockerd daemon must be started with --userns-remap flag.
The user or group specified for --userns-remap must have subordinate user and group IDs allocated in
/etc/subuid and /etc/subgid files.
References: https://docs.docker.com/engine/security/userns-remap/#enable-userns-remap-on-the-daemon
https://docs.docker.com/engine/security/userns-remap/#prerequisites-for-user-namespace-remapping

NEW QUESTION # 185
......

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