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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Orchestration | 25% | - Perform rolling updates and rollbacks - Create and manage services, stacks, secrets, and configurations - Deploy and manage Swarm clusters |
| Topic 2: Images and Registry | 20% | - Manage image layers, tagging, and versioning - Write efficient Dockerfiles, multi-stage builds - Work with Docker Hub and private registries - Sign and verify images with Docker Content Trust |
| Topic 3: Storage | 10% | - Backup, restore, and migrate data - Use volumes, bind mounts, and tmpfs - Configure persistent storage and data management |
| Topic 4: Installation and Configuration | 15% | - Configure daemon options, logging, and storage drivers - Install Docker Engine on Linux, Windows, and macOS - Set up Docker Enterprise components |
| Topic 5: Security | 15% | - Scan images for vulnerabilities - Manage user access and roles - Apply security profiles and capabilities - Secure daemon and API communication |
| Topic 6: Networking | 15% | - Secure and troubleshoot container networking - Understand bridge, overlay, and macvlan networks - Expose ports, publish services, and manage DNS |
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NEW QUESTION # 47
Is this an advantage of multi-stage builds?
Solution: better caching when building Docker images
Answer: B
Explanation:
Better caching when building Docker images is an advantage of multi-stage builds. Multi-stage builds allow you to use multiple FROM statements in your Dockerfile, each starting a new stage of the build1. This can help you improve the caching efficiency of your Docker images, as each stage can use its own cache layer2. For example, if you have a stage that installs dependencies and another stage that compiles your code, you can reuse the cached layer of the dependencies stage if they don't change, and only rebuild the code stage if it changes2. This can save you time and bandwidth when building and pushing your images. References:
* Multi-stage builds | Docker Docs
* What Are Multi-Stage Docker Builds? - How-To Geek
NEW QUESTION # 48
An application image runs in multiple environments, with each environment using different certificates and ports.
Is this a way to provision configuration to containers at runtime?
Solution: Provision a Docker config object for each environment.
Answer: B
Explanation:
= Provisioning a Docker config object for each environment is a way to provision configuration to containers at runtime. Docker configs allow services to adapt their behaviour without the need to rebuild a Docker image. Services can only access configs when explicitly granted by a configs attribute within the services top-level element. As with volumes, configs are mounted as files into a service's container's filesystem1. Docker configs are supported on both Linux and Windows services2. Reference: Docker Documentation, Configs top-level element
NEW QUESTION # 49
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 # 50
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object.
Does this command display it?
Solution: kubectl logs deployment api
Answer: B
Explanation:
Explanation
= The command kubectl logs deployment api does not display the events table for the deployment object, but rather the logs of the pods that belong to the deployment. To see the events table, you need to use the command kubectl describe deployment api, which shows the details of the deployment, including the events1. References: Kubernetes Documentation, Practice Questions for Docker Certified Associate (DCA) Exam
NEW QUESTION # 51
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Storage
Answer: B
Explanation:
Explanation
= Storage 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. The feature works by having the same namespace for a set of resources and processes, but those namespaces refer to distinct resources. Since kernel version 5.6, there are 8 kinds of namespaces: mount, UTS, IPC, PID, network, user, cgroup, and time2. Each kind of namespace isolates a different aspect of the system, such as file system mounts, host and domain names, inter-process communication, process IDs, network interfaces, user and group IDs, cgroups, and system time2. Storage is not one of them. References:
* 1: Linux namespaces - Wikipedia
* 2: Namespaces - The Linux Kernel documentation
NEW QUESTION # 52
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