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| Section | Weight | Objectives |
|---|---|---|
| Networking | 15% | - Describe the different types and use cases for the built-in network drivers - Troubleshoot container and engine logs to understand a connectivity issue between containers - 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 how to install a remote driver to a specific infrastructure provider - Describe the differences between "host" and "ingress" port publishing mode - Understand the Container Network Model and how it interfaces with the Docker engine and network and IPAM drivers - Configure Docker to use external DNS - Publish a port so that an application is accessible externally |
| Installation and Configuration | 15% | - Describe namespaces, cgroups, and configuration of certificates - Interpret errors to troubleshoot installation issues without assistance - Create and manager user and teams - Configure logging drivers (splunk, journald, etc.) - Use the install command to install DTR (Docker Trusted Registry) - Demonstrate the ability to upgrade the Docker engine - Describe the use of UCP (Universal Control Plane) - Outline the sizing requirements prior to installation - Complete setup of repo, select a storage driver, and complete installation of Docker engine on multiple platforms - Describe the interaction between Docker and Linux - Setup swarm, configure managers, add nodes, and setup the backup schedule |
| Image Creation, Management, and Registry | 20% | - 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 - Display layers of a Docker image - Describe how to set up and use a local registry - Utilize a registry to store an image - Demonstrate tagging an image - Use CLI commands such as list, delete, prune, rmi, etc. to manage images - Identify and display the main parts of a Dockerfile - Describe the use of Dockerfile - Apply a file to create a new image - Describe how an image registry works |
| Security | 15% | - Describe the security architecture and responsibilities of the Docker EE platform - Enable Docker Content Trust - Describe the difference between UCP and DTR - Describe UCP and DTR integration with LDAP/AD - Describe swarm default security - Describe identity roles - Describe MTLS and identity roles - Compare the UCP workers and managers - Describe MTLS - Describe the process to sign a Docker image - Describe default engine security - Configure RBAC with UCP |
| Storage and Volumes | 10% | - Describe how volumes work with containers - Describe how to use a volume plugin (local vs. NFS) - Identify the steps to take to clean up unused images on a filesystem and DTR - Describe the storage models available for DTR (NFS, local) - Describe the different graph driver storage backends - Describe the use of tmpfs for ephemeral storage |
| Orchestration | 25% | - Increase number of replicas - Describe the difference between global and replicated services - Manipulate a running stack of services - Convert an application deployment into a stack file using a YAML compose file with "docker stack deploy" - State the differences between running a container vs running a service - Describe how to provide configuration to Kubernetes pods using configMaps and secrets - Describe how a Dockerized application communicates with legacy systems - Interpret the output of "docker inspect" commands - Mount volumes - Add networks, publish ports - Extend the instructions to run individual containers into running services under swarm - Describe how to deploy containerized workloads as Kubernetes pods and deployments - Demonstrate steps to lock a swarm cluster - Identify the steps needed to troubleshoot a service not deploying - Complete the setup of a swarm mode cluster - Describe and demonstrate how to use replication mode |
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NEW QUESTION # 13
Will this command display a list of volumes for a specific container?
Solution. 'docker container logs nginx -volumes'
Answer: A
Explanation:
Explanation
Using docker container logs nginx --volumes does not display a list of volumes for a specific container. The docker container logs command shows information about the logs of a container. The --volumes flag is not a valid option for this command and will cause an error. To display a list of volumes for a specific container, you need to use docker container inspect nginx --format '{{ .Mounts }}'. References:
https://docs.docker.com/engine/reference/commandline/container_logs/,
https://docs.docker.com/engine/reference/commandline/container_inspect/
NEW QUESTION # 14
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: A
NEW QUESTION # 15
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: isolation between resources used by containers
Answer: B
Explanation:
Explanation
Control Groups (cgroups) are a Linux kernel feature that allow you to limit, modify, or allocate resources as needed1. Docker uses cgroups to isolate the resources used by containers, such as CPU, memory, disk I/O, network, etc2. This means that each container can have its own set of resource limits and constraints, and that the containers cannot interfere with each other or with the host system2. This improves the security, performance, and reliability of the containers and the system as a whole. References:
* Lab: Control Groups (cgroups) | dockerlabs
* Docker run reference | Docker Docs
NEW QUESTION # 16
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 inspect http'
Answer: A
Explanation:
Explanation
Using 'docker service inspect http' does not enable you to view the list of historical tasks for this service. The docker service inspect command shows low-level information about one or more services, such as their configuration, replicas, networks, endpoints, etc. It does not show the history of tasks that have been run by the service. To view the list of historical tasks for this service, you need to use 'docker service ps http'.
References: https://docs.docker.com/engine/reference/commandline/service_inspect/,
https://docs.docker.com/engine/reference/commandline/service_ps/
NEW QUESTION # 17
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 run -- log driver=splunk for every container at run time
Answer: B
Explanation:
Explanation
The command docker run --log-driver=splunk for every container at run time will configure a Docker container to export container logs to the logging solution. The reason is that the --log-driver option specifies the logging driver for the container, which determines how the container logs are handled1. The splunk logging driver is a plugin that sends container logs to HTTP Event Collector in Splunk Enterprise and Splunk Cloud2. To use the splunk logging driver, you also need to provide some additional options with the --log-opt flag, such as the Splunk token, URL, source, sourcetype, index, etc2. For example, to run a container with the splunk logging driver and send the logs to a Splunk instance with the URL https://splunk.example.com:8088 and the token 176fabb6-7811-4b3a-8ba0-4d49302e50f2, you can use:
docker run --log-driver=splunk --log-opt splunk-token=176fabb6-7811-4b3a-8ba0-4d49302e50f2 --log-opt splunk-url=https://splunk.example.com:8088 ...
This way, you can configure a Docker container to export container logs to Splunk, which is a centralized logging solution. Alternatively, you can also 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 Docker3. This will apply the splunk logging driver to all containers unless overridden by the --log-driver option. References:
* Configure logging drivers
* Splunk logging driver
* Set the logging driver for the Docker daemon
NEW QUESTION # 18
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