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| Section | Weight | Objectives |
|---|---|---|
| Security | 15% | - Configure RBAC with UCP - Describe MTLS and identity roles - Compare the UCP workers and managers - Describe the process to sign a Docker image - Describe swarm default security - Describe UCP and DTR integration with LDAP/AD - Enable Docker Content Trust - Describe identity roles - Describe the difference between UCP and DTR - Describe MTLS - Describe default engine security - Describe the security architecture and responsibilities of the Docker EE platform |
| Orchestration | 25% | - Describe how to deploy containerized workloads as Kubernetes pods and deployments - Describe and demonstrate how to use replication mode - Extend the instructions to run individual containers into running services under swarm - Demonstrate steps to lock a swarm cluster - State the differences between running a container vs running a service - Describe the difference between global and replicated services - Interpret the output of "docker inspect" commands - Mount volumes - Convert an application deployment into a stack file using a YAML compose file with "docker stack deploy" - Manipulate a running stack of services - Describe how a Dockerized application communicates with legacy systems - Describe how to provide configuration to Kubernetes pods using configMaps and secrets - Add networks, publish ports - Identify the steps needed to troubleshoot a service not deploying - Increase number of replicas - Complete the setup of a swarm mode cluster |
| Networking | 15% | - Configure Docker to use external DNS - Understand the Container Network Model and how it interfaces with the Docker engine and network and IPAM drivers - Create a Docker bridge network for a developer to use for their containers - Troubleshoot container and engine logs to understand a connectivity issue between containers - Describe how to install a remote driver to a specific infrastructure provider - Identify which IP and port a container is externally accessible on - Describe the differences between "host" and "ingress" port publishing mode - Describe the different types and use cases for the built-in network drivers - Publish a port so that an application is accessible externally |
| Storage and Volumes | 10% | - Describe the storage models available for DTR (NFS, local) - Describe how volumes work with containers - Describe the use of tmpfs for ephemeral storage - Describe the different graph driver storage backends - 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 |
| Installation and Configuration | 15% | - Configure logging drivers (splunk, journald, etc.) - Demonstrate the ability to upgrade the Docker engine - Describe namespaces, cgroups, and configuration of certificates - Use the install command to install DTR (Docker Trusted Registry) - Describe the use of UCP (Universal Control Plane) - Interpret errors to troubleshoot installation issues without assistance - Create and manager user and teams - Setup swarm, configure managers, add nodes, and setup the backup schedule - Describe the interaction between Docker and Linux - Outline the sizing requirements prior to installation - Complete setup of repo, select a storage driver, and complete installation of Docker engine on multiple platforms |
| Image Creation, Management, and Registry | 20% | - Identify and display the main parts of a Dockerfile - Describe how an image registry works - Inspect images and report specific attributes using filter and format - Apply a file to create a new image - Describe the use of Dockerfile - Utilize a registry to store an image - Describe how image layers work - Describe how to set up and use a local registry - Use CLI commands such as list, delete, prune, rmi, etc. to manage images - Describe options, such as add, copy, volumes, expose, entry point - Demonstrate tagging an image - Display layers of a Docker image - Give examples on how to create an efficient image via a Dockerfile |
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NEW QUESTION # 128
Is this a supported user authentication method for Universal Control Plane?
Solution. x.500
Answer: B
Explanation:
Explanation
x.500 is not a supported user authentication method for Universal Control Plane (UCP). x.500 is a series of standards for directory services that define how distributed directory information can be accessed and managed over a network. x.500 is not an external authentication backend that UCP supports. UCP supports LDAP, Active Directory, and SAML as external authentication backends. References:
https://docs.docker.com/ee/ucp/admin/configure/external-auth/, https://en.wikipedia.org/wiki/X.500
NEW QUESTION # 129
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution. pid
Answer: B
Explanation:
Explanation
pid is not a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. pid is a Linux kernel namespace that provides process isolation for containers. It ensures that processes in one container cannot see or signal processes in another container or on the host system. pid is enabled by default for Docker containers and does not require any special flag or option to be used. However, you can disable pid isolation for a container by using --pid host option when creating or running a container.
This option connects the container to the host's pid namespace and allows the container to see and signal processes on the host system. References: https://docs.docker.com/engine/reference/run/#pid-settings-pid,
https://en.wikipedia.org/wiki/Linux_namespaces#Process_ID_(pid)
NEW QUESTION # 130
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 describe deployment api
Answer: A
Explanation:
Explanation
= The command kubectl describe deployment api displays the events table for the deployment object called api, along with other information such as labels, replicas, strategy, conditions, and pod template. The events table shows the history of actions that have affected the deployment, such as scaling, updating, or creating pods. This can help troubleshoot any issues with the deployment. To see only the events table, you can use the flag --show-events=true with the command. References:
* Deployments | Kubernetes
* kubectl - How to describe kubernetes resource - Stack Overflow
* Kubectl: Get Deployments - Kubernetes - ShellHacks
* kubernetes - Kubectl get deployment yaml file - Stack Overflow
NEW QUESTION # 131
One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: The controller managing the pod is autoscaled back to delete the unhealthy pod and alleviate load.
Answer: B
Explanation:
= The livenessProbe is a mechanism that checks if the container is alive and healthy, and restarts it if it fails1. The orchestrator is the component that manages the deployment and scaling of containers across a cluster of nodes2. The action taken by the orchestrator to fix the unhealthy container is not to autoscale back and delete the pod, but to recreate the pod on the same or a different node3. This ensures that the desired number of replicas for the pod is maintained, and that the pod can resume its normal operation. Autoscaling back and deleting the pod would reduce the availability and performance of the service, and would not necessarily alleviate the load.
References:
* Configure Liveness, Readiness and Startup Probes | Kubernetes
* What is a Container Orchestrator? | Docker
* Pod Lifecycle | Kubernetes
I hope this helps you understand the concept of livenessProbe and orchestrator, and how they work with Docker and Kubernetes. If you have any other questions related to Docker, please feel free to ask me.
NEW QUESTION # 132
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker service create --network --secure
Answer: B
NEW QUESTION # 133
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