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NEW QUESTION # 17
Will This command list all nodes in a swarm cluster from the command line?
Solution. 'docker swarm nodes'
Answer: B
Explanation:
= The command 'docker swarm nodes' is not a valid command to list all nodes in a swarm cluster from the command line. The correct command is docker node ls, which can be run on a manager node to view the details of all the nodes in the swarm1.The docker swarm command is used to manage the swarm itself, not the nodes. For example, you can use docker swarm init to create a new swarm, or docker swarm join to add a node to an existing swarm2. Reference:
Manage nodes in a swarm | Docker Docs
docker swarm | Docker Docs
NEW QUESTION # 18
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?
Solution: Set IGNORE_TLS in the 'daemon.json' configuration file.
Answer: B
Explanation:
Explanation
= This is not a way to configure the Docker engine to use a registry without a trusted TLS certificate. There is no such option as IGNORE_TLS in the daemon.json configuration file. The daemon.json file is used to configure various aspects of the Docker engine, such as logging, storage, networking, and security1. To use a registry without a trusted TLS certificate, you need to either add the certificate to the trusted root certificates of the system, or configure the Docker engine to allow insecure registries2. To add the certificate to the trusted root certificates, you need to copy the certificate file to the /etc/docker/certs.d/<registry-hostname>/ directory on every Docker host2. To configure the Docker engine to allow insecure registries, you need to add the registry hostname or IP address to the "insecure-registries" array in the daemon.json file3. For example:
{ "insecure-registries" : ["myregistry.example.com:5000"] }
Note that using insecure registries is not recommended, as it exposes you to potential man-in-the-middle attacks and data corruption3. You should always use a registry with a trusted TLS certificate, or use Docker Content Trust to sign and verify your images4. References:
* Daemon configuration file | Docker Docs
* Verify repository client with certificates | Docker Docs
* Test an insecure registry | Docker Docs
* Content trust in Docker | Docker Docs
NEW QUESTION # 19
Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution.Delete the image and delete the image repository from Docker Trusted Registry.
Answer: B
Explanation:
Explanation
The sequence of steps will not completely delete an image from disk in the Docker Trusted Registry. Deleting an image and deleting an image repository from the Docker Trusted Registry will only remove the references to the image, but not the actual image data on the disk1. To completely delete an image from disk, you need to run the garbage collection command on the registry server, which will delete any unreferenced blobs2. The garbage collection command is bin/registry garbage-collect /path/to/config.yml3. References: Deleting an image), Garbage collection), Running garbage collection)
NEW QUESTION # 20
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 unhealthy container is restarted.
Answer: A
Explanation:
Explanation
The unhealthy container is restarted by the orchestrator to fix the unhealthy container, because this is the default behavior of Kubernetes when a container fails its livenessProbe. According to the official documentation, Kubernetes will kill and restart the container if it does not become healthy after a certain number of failures.
References:
https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#define-a-li
NEW QUESTION # 21
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Network
Answer: A
Explanation:
Network is a type of Linux kernel namespace that provides container isolation. Network namespaces isolate the system resources associated with networking, such as network interfaces, IP addresses, routing tables, firewall rules, etc. Each network namespace has its own virtual network stack, and processes in different network namespaces can communicate through virtual network devices or tunnels1. Network namespaces are used by Docker to create isolated networks for containers, and allow users to customize the network configuration and connectivity of each container2. References:
* network_namespaces(7) - Linux manual page
* Docker network overview | Docker Documentation
NEW QUESTION # 22
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