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| Section | Weight | Objectives |
|---|---|---|
| Networking | 15% | - Secure and troubleshoot container networking - Understand bridge, overlay, and macvlan networks - Expose ports, publish services, and manage DNS |
| Installation and Configuration | 15% | - Set up Docker Enterprise components - Configure daemon options, logging, and storage drivers - Install Docker Engine on Linux, Windows, and macOS |
| Orchestration | 25% | - Deploy and manage Swarm clusters - Create and manage services, stacks, secrets, and configurations - Perform rolling updates and rollbacks |
| Storage | 10% | - Backup, restore, and migrate data - Configure persistent storage and data management - Use volumes, bind mounts, and tmpfs |
| Images and Registry | 20% | - Sign and verify images with Docker Content Trust - Manage image layers, tagging, and versioning - Write efficient Dockerfiles, multi-stage builds - Work with Docker Hub and private registries |
| Security | 15% | - Scan images for vulnerabilities - Manage user access and roles - Apply security profiles and capabilities - Secure daemon and API communication |
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NEW QUESTION # 170
What is the difference between a resource limit and a resource reservation when scheduling services?
Answer: C
NEW QUESTION # 171
A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.
Can this be used to schedule containers to meet the security policy requirements?
Solution: label contraints
Answer: A
Explanation:
Explanation
Label constraints can be used to schedule containers to meet the security policy requirements. Label constraints allow you to specify which nodes a service can run on based on the labels assigned to the nodes1.
For example, you can label the nodes that are intended for development with env=dev and the nodes that are intended for production with env=prod. Then, you can use the --constraint flag when creating a service to restrict it to run only on nodes with a certain label value. For example, docker service create --name dev-app
--constraint 'node.labels.env == dev' ... will create a service that runs only on development nodes2. Similarly, docker service create --name prod-app --constraint 'node.labels.env == prod' ... will create a service that runs only on production nodes3. This way, you can ensure that development and production containers are running on separate nodes in a given Swarm cluster. References:
* Add labels to swarm nodes
* Using placement constraints with Docker Swarm
* Multiple label placement constraints in docker swarm
NEW QUESTION # 172
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay -o encrypted=true <network-name>
Answer: A
Explanation:
Explanation
The command docker network create -d overlay -o encrypted=true <network-name> will ensure that overlay traffic between service tasks is encrypted. This command creates an overlay network with the encryption option enabled, which means that Docker will create IPSEC tunnels between all the nodes where tasks are scheduled for services attached to the overlay network. These tunnels use the AES algorithm in GCM mode and manager nodes automatically rotate the keys every 12 hours1. This way, the data exchanged between containers on different nodes on the overlay network is secured. References:
* Overlay network driver
NEW QUESTION # 173
Is this an advantage of multi-stage builds?
Solution: better caching when building Docker images
Answer: A
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 # 174
How do you change the default logging driver for the docker daemon in Linux?
Answer: D
NEW QUESTION # 175
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