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NEW QUESTION # 38
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run --add-volume /data /mydata -read-only ubuntu'
Answer: B
Explanation:
n: = Using the DTR web UI to make all tags in the repository immutable is not a good way to prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository. This is because making all tags immutable would prevent any updates to the images in the repository, which may not be desirable for some use cases. For example, if a user wants to push a new version of 'nginx:latest' with a security patch, they would not be able to do so if the tag is immutable. A better way to prevent an image from being overwritten by another user is to use the DTR web UI to create a promotion policy that restricts who can push to a specific tag or repository1. Alternatively, the user can also use the DTR API to create a webhook that triggers a custom action when an image is pushed to a repository2. References:
* Prevent tags from being overwritten | Docker Docs
* Create webhooks | Docker Docs
NEW QUESTION # 39
You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution:'docker service ps http'
Answer: A
Explanation:
= The command 'docker service ps http' will list the tasks that are running as part of the 'http' service, as well as the task history1. The task history shows the previous states of the tasks, such as running, shutdown, rejected, etc. This can help you troubleshoot why the service is not registering as healthy, by looking at the current state, error, and ports of each task1. Reference:
docker service ps | Docker Docs
Docker Certified Associate Guide
DCA Prep Guide
NEW QUESTION # 40
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use --link to access the container on the bridge network.
Answer: B
Explanation:
Explanation
Using --link to access the container on the bridge network does not make the container reachable from its host's network. The --link option allows containers to communicate with each other using a private network created by Docker. To make a container reachable from its host's network, you need to use either EXPOSE or
--publish to access the containers on the bridge network. References: https://docs.docker.com/network/links/,
https://docs.docker.com/network/bridge/
NEW QUESTION # 41
Which of the following commands starts a Redis container and configures it to always restart unless it is
explicitly stopped or Docker is restarted?
Answer: B
NEW QUESTION # 42
Will this command mount the host's '/data1directory to the ubuntu container in read-only mode?
Solution. 'docker run -v /data:/mydata -mode readonly ubuntu'
Answer: B
Explanation:
The command docker run -v /data:/mydata -mode readonly ubuntu will not mount the host's /data1 directory to the ubuntu container in read-only mode. The commandhas several errors that prevent it from working correctly. First, the host directory should be /data1 instead of /data, as specified in the question. Second, the option flag should be --mode instead of -mode, and it should be placed before the image name. Third, the mode value should be ro instead of readonly, as per the Docker documentation1. The correct command should be docker run -v /data1:/mydata --mode ro ubuntu, which will mount the host's /data1 directory as a read-only volume at /mydata inside the container1. Reference:
docker run | Docker Docs
NEW QUESTION # 43
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