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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Image Creation, Management, and Registry | 20% | - Identify and display the main parts of a Dockerfile - Describe how an image registry works - Apply a file to create a new image - Use CLI commands such as list, delete, prune, rmi, etc. to manage images - Inspect images and report specific attributes using filter and format - Describe how image layers work - Give examples on how to create an efficient image via a Dockerfile - Describe options, such as add, copy, volumes, expose, entry point - Utilize a registry to store an image - Describe the use of Dockerfile - Display layers of a Docker image - Demonstrate tagging an image - Describe how to set up and use a local registry |
| Topic 2: Installation and Configuration | 15% | - Use the install command to install DTR (Docker Trusted Registry) - Setup swarm, configure managers, add nodes, and setup the backup schedule - Describe the use of UCP (Universal Control Plane) - Complete setup of repo, select a storage driver, and complete installation of Docker engine on multiple platforms - Interpret errors to troubleshoot installation issues without assistance - Demonstrate the ability to upgrade the Docker engine - Describe namespaces, cgroups, and configuration of certificates - Create and manager user and teams - Describe the interaction between Docker and Linux - Outline the sizing requirements prior to installation - Configure logging drivers (splunk, journald, etc.) |
| Topic 3: Security | 15% | - Describe MTLS - Describe default engine security - Describe UCP and DTR integration with LDAP/AD - Describe swarm default security - Describe MTLS and identity roles - Compare the UCP workers and managers - Enable Docker Content Trust - Configure RBAC with UCP - Describe the process to sign a Docker image - Describe identity roles - Describe the security architecture and responsibilities of the Docker EE platform - Describe the difference between UCP and DTR |
| Topic 4: Networking | 15% | - Troubleshoot container and engine logs to understand a connectivity issue between containers - Understand the Container Network Model and how it interfaces with the Docker engine and network and IPAM drivers - Publish a port so that an application is accessible externally - Describe the differences between "host" and "ingress" port publishing mode - Configure Docker to use external DNS - Create a Docker bridge network for a developer to use for their containers - Identify which IP and port a container is externally accessible on - Describe the different types and use cases for the built-in network drivers - Describe how to install a remote driver to a specific infrastructure provider |
| Topic 5: Storage and Volumes | 10% | - Describe the storage models available for DTR (NFS, local) - Describe how to use a volume plugin (local vs. NFS) - Describe how volumes work with containers - Identify the steps to take to clean up unused images on a filesystem and DTR - Describe the use of tmpfs for ephemeral storage - Describe the different graph driver storage backends |
| Topic 6: Orchestration | 25% | - Mount volumes - Describe and demonstrate how to use replication mode - Add networks, publish ports - Increase number of replicas - Demonstrate steps to lock a swarm cluster - Identify the steps needed to troubleshoot a service not deploying - State the differences between running a container vs running a service - Describe how to provide configuration to Kubernetes pods using configMaps and secrets - Complete the setup of a swarm mode cluster - Extend the instructions to run individual containers into running services under swarm - Describe the difference between global and replicated services - Manipulate a running stack of services - Interpret the output of "docker inspect" commands - Describe how a Dockerized application communicates with legacy systems - Convert an application deployment into a stack file using a YAML compose file with "docker stack deploy" - Describe how to deploy containerized workloads as Kubernetes pods and deployments |
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NEW QUESTION # 149
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 inspect http"
Answer: A
Explanation:
The command docker inspect http will not enable you to view the list of historical tasks for the service. The docker inspect command returns low-level information on Docker objects, such as containers, images, networks, or volumes1. It does not work on services, which are higher-level objects that define the desired state of a set of tasks2. To view the list of historical tasks for a service, you need to use the docker service ps command, which shows the current and previous states of each task, as well as the node, error, and ports3. References:
* docker inspect | Docker Docs
* Services | Docker Docs
* docker service ps | Docker Docs
NEW QUESTION # 150
You add a new user to the engineering organization in DTR.
Will this action grant them read/write access to the engineering/api repository?
Solution: Add them to a team in the engineering organization that has read/write access to the engineering/api repository.
Answer: B
Explanation:
Explanation
This action will grant them read/write access to the engineering/api repository, because adding them to a team in the engineering organization that has read/write access to the engineering/api repository is another way to grant permissions to a user in DTR. According to the official documentation, this is an example of using teams and organizations for managing permissions.
References: https://docs.docker.com/ee/dtr/user/manage-repos/permission-levels/
NEW QUESTION # 151
You want to create a container that is reachable from its host's network.
Does this action accomplish this?
Solution. Use network connect to access the container on the bridge network.
Answer: B
Explanation:
Explanation
Using network connect to access the container on the bridge network does create a container that is reachable from its host's network. The network connect command connects a running container to another network. By default, Docker creates and connects containers to a bridge network, which is an internal network that isolates containers from each other and from the host. However, you can use network connect to connect a container to another network, such as the host network, which allows the container to share the host's network stack and be reachable from the host's network. References:
https://docs.docker.com/engine/reference/commandline/network_connect/,
https://docs.docker.com/network/bridge/, https://docs.docker.com/network/host/
NEW QUESTION # 152
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution. capabilities
Answer: B
Explanation:
Capabilities are a Linux kernel feature that allows processes to perform some privileged operations without having the full power of the root user1. Docker uses capabilities to limit the access of containers to host resources, such as CPU or memory2. By default, Docker drops all capabilities except those needed for the container to function properly, using a whitelist approach3. This reduces the risk of a container compromising the host system or other containers. You can also add or remove capabilities to or from a container at runtime, using the --cap-add or --cap-drop options of the docker run command4. This gives you more control over the security and functionality of your containers. References:
* Capabilities | dockerlabs
* Docker run reference | Docker Docs
* Docker Capabilities and no-new-privileges
* Runtime privilege and Linux capabilities | Docker Docs
NEW QUESTION # 153
Your organization has a centralized logging solution, such as Splunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution: docker logs <container-id>
Answer: A
NEW QUESTION # 154
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