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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Image Creation, Management, and Registry | 20% | - Describe how an image registry works - Describe how image layers work - Apply a file to create a new image - Describe options, such as add, copy, volumes, expose, entry point - Describe the use of Dockerfile - Describe how to set up and use a local registry - Give examples on how to create an efficient image via a Dockerfile - Demonstrate tagging an image - Use CLI commands such as list, delete, prune, rmi, etc. to manage images - Display layers of a Docker image - Utilize a registry to store an image - Identify and display the main parts of a Dockerfile - Inspect images and report specific attributes using filter and format |
| Topic 2: Networking | 15% | - Describe how to install a remote driver to a specific infrastructure provider - Describe the different types and use cases for the built-in network drivers - Identify which IP and port a container is externally accessible on - Create a Docker bridge network for a developer to use for their containers - Describe the differences between "host" and "ingress" port publishing mode - Publish a port so that an application is accessible externally - Understand the Container Network Model and how it interfaces with the Docker engine and network and IPAM drivers - Troubleshoot container and engine logs to understand a connectivity issue between containers - Configure Docker to use external DNS |
| Topic 3: Installation and Configuration | 15% | - Describe namespaces, cgroups, and configuration of certificates - Use the install command to install DTR (Docker Trusted Registry) - Outline the sizing requirements prior to installation - Setup swarm, configure managers, add nodes, and setup the backup schedule - Describe the use of UCP (Universal Control Plane) - Demonstrate the ability to upgrade the Docker engine - Describe the interaction between Docker and Linux - Create and manager user and teams - Interpret errors to troubleshoot installation issues without assistance - Configure logging drivers (splunk, journald, etc.) - Complete setup of repo, select a storage driver, and complete installation of Docker engine on multiple platforms |
| Topic 4: Storage and Volumes | 10% | - Describe the use of tmpfs for ephemeral storage - Describe how volumes work with containers - Describe the different graph driver storage backends - Describe how to use a volume plugin (local vs. NFS) - Describe the storage models available for DTR (NFS, local) - Identify the steps to take to clean up unused images on a filesystem and DTR |
| Topic 5: Orchestration | 25% | - State the differences between running a container vs running a service - Demonstrate steps to lock a swarm cluster - Describe how a Dockerized application communicates with legacy systems - Increase number of replicas - Identify the steps needed to troubleshoot a service not deploying - Describe and demonstrate how to use replication mode - Describe how to deploy containerized workloads as Kubernetes pods and deployments - Describe the difference between global and replicated services - Extend the instructions to run individual containers into running services under swarm - Complete the setup of a swarm mode cluster - Describe how to provide configuration to Kubernetes pods using configMaps and secrets - Add networks, publish ports - Mount volumes - Interpret the output of "docker inspect" commands - Convert an application deployment into a stack file using a YAML compose file with "docker stack deploy" - Manipulate a running stack of services |
| Topic 6: Security | 15% | - Compare the UCP workers and managers - Describe the difference between UCP and DTR - Describe UCP and DTR integration with LDAP/AD - Describe MTLS and identity roles - Describe default engine security - Describe the process to sign a Docker image - Describe identity roles - Describe the security architecture and responsibilities of the Docker EE platform - Describe swarm default security - Configure RBAC with UCP - Describe MTLS - Enable Docker Content Trust |
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NEW QUESTION # 17
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker service create --network --secure
Answer: B
Explanation:
Explanation
This command will not ensure that overlay traffic between service tasks is encrypted, because it uses an invalid option for enabling encryption and an incomplete option for specifying the network. According to the official documentation, there is no such option as --secure for the docker service create command. The correct option to use is --network <network-name> where <network-name> is an existing overlay network that was created with encryption enabled.
References: https://docs.docker.com/network/drivers/overlay/#encryption
https://docs.docker.com/engine/reference/commandline/service_create/
NEW QUESTION # 18
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: node taints
Answer: B
Explanation:
Node taints are a way to mark nodes in a Swarm cluster so that they can repel or attract certain containers based on their tolerations. By applying node taints to the nodes that are designated for development or production, the company can ensure that only the containers that have the matching tolerations can be scheduled on those nodes. This way, the security policy requirements can be met. Node taints are expressed as key=value:effect, where the effect can be NoSchedule, PreferNoSchedule, or NoExecute. For example, to taint a node for development only, one can run:
kubectl taint nodes node1 env=dev:NoSchedule
This means that no container will be able to schedule onto node1 unless it has a toleration for the taint env=dev:NoSchedule. To add a toleration to a container, one can specify it in the PodSpec. For example:
tolerations:
- key: "env"
operator: "Equal"
value: "dev"
effect: "NoSchedule"
This toleration matches the taint on node1 and allows the container to be scheduled on it. Reference:
Taints and Tolerations | Kubernetes
Update the taints on one or more nodes in Kubernetes
A Complete Guide to Kubernetes Taints & Tolerations
NEW QUESTION # 19
Will this command display a list of volumes for a specific container?
Solution: docker volume logs nginx --containers'
Answer: B
Explanation:
= I cannot give you a comprehensive explanation, but I can tell you that the command is not correct. The docker volume command is used to manage volumes, not to display logs1. The docker logs command is used to display the logs of a container2. The solution suggests using docker volume logs nginx --containers, which is not a valid syntax. To display the list of volumes for a specific container, you can use the docker inspect command with a filter option3. For example, docker inspect -f '{{ .Mounts }}' nginx will show the volumes mounted by the nginx container4. You will need to understand how to use the docker commands and options to answer this question correctly. Reference:
Docker volume command documentation: 1
Docker logs command documentation: 2
Docker inspect command documentation: 3
How to list volumes of a container: 4
I hope this helps you prepare for your DCA exam. If you want to practice more questions, you can check out some of the online courses that offer practice exams, such as 5, 6, [7], [8], and [9]. Good luck!
NEW QUESTION # 20
Is this a supported user authentication method for Universal Control Plane?
Solution.SAML
Answer: B
Explanation:
Explanation
= SAML is a supported user authentication method for Universal Control Plane (UCP). UCP has its own built-in authentication mechanism and integrates with LDAP and Active Directory. It also supports Role Based Access Control (RBAC) and Docker Content Trust. UCP allows you to configure SAML as an authentication method and connect it to your Identity Provider (IdP). You need to provide the Entity ID and the ACS URL from UCP to your IdP, and the SAML Sign-on URL and the x509 Certificate from your IdP to UCP12. References:
* SAML | Docker Docs
* Configure Single Sign-On | Docker Docs
NEW QUESTION # 21
Your organization has a centralized logging solution, such as Sptunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution.docker system events- -filter splunk
Answer: B
Explanation:
The command docker system events --filter splunk will not configure a Docker container to export container logs to the logging solution. The command docker system events will display real-time events from the Docker daemon, such as container creation, start, stop, etc. The --filter option will filter the events by various criteria, such as type, label, name, etc. However, there is no filter for splunk, and even if there was, it would only show the events related to Splunk, not the container logs. To configure a Docker container to export container logs to Splunk, you need to use the Splunk loggingdriver, which is a plugin that sends container logs to HTTP Event Collector in Splunk Enterprise and Splunk Cloud. You can use the --log-driver and --log-opt options when creating or running a container to specify the Splunk logging driver and its options, such as the Splunk token, URL, source, sourcetype, index, etc. Alternatively, you can configure the Splunk logging driver as the default logging driver for the Docker daemon by setting the log-driver and log-opts keys in the daemon.json file and restarting Docker. Reference:
docker system events
Splunk logging driver
How to send Docker containers logs to Splunk?
NEW QUESTION # 22
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