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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Orchestration | 25% | - Interpret the output of "docker inspect" commands - Add networks, publish ports - Extend the instructions to run individual containers into running services under swarm - Describe how a Dockerized application communicates with legacy systems - Describe the difference between global and replicated 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 - Complete the setup of a swarm mode cluster - Identify the steps needed to troubleshoot a service not deploying - Increase number of replicas - Mount volumes - Describe how to provide configuration to Kubernetes pods using configMaps and secrets - Demonstrate steps to lock a swarm cluster - Manipulate a running stack of services - Describe and demonstrate how to use replication mode - Describe how to deploy containerized workloads as Kubernetes pods and deployments |
| Topic 2: Networking | 15% | - Describe the differences between "host" and "ingress" port publishing mode - Troubleshoot container and engine logs to understand a connectivity issue between containers - 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 - 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 - Create a Docker bridge network for a developer to use for their containers - Identify which IP and port a container is externally accessible on - Configure Docker to use external DNS |
| Topic 3: Storage and Volumes | 10% | - Describe the use of tmpfs for ephemeral storage - Describe how to use a volume plugin (local vs. NFS) - Describe the storage models available for DTR (NFS, local) - Describe how volumes work with containers - Describe the different graph driver storage backends - Identify the steps to take to clean up unused images on a filesystem and DTR |
| Topic 4: Security | 15% | - Describe swarm default security - Compare the UCP workers and managers - Describe the process to sign a Docker image - Enable Docker Content Trust - Describe default engine security - Describe the difference between UCP and DTR - Configure RBAC with UCP - Describe UCP and DTR integration with LDAP/AD - Describe identity roles - Describe the security architecture and responsibilities of the Docker EE platform - Describe MTLS - Describe MTLS and identity roles |
| Topic 5: Installation and Configuration | 15% | - Use the install command to install DTR (Docker Trusted Registry) - Complete setup of repo, select a storage driver, and complete installation of Docker engine on multiple platforms - Describe namespaces, cgroups, and configuration of certificates - Interpret errors to troubleshoot installation issues without assistance - Demonstrate the ability to upgrade the Docker engine - Outline the sizing requirements prior to installation - Describe the use of UCP (Universal Control Plane) - Create and manager user and teams - Configure logging drivers (splunk, journald, etc.) - Setup swarm, configure managers, add nodes, and setup the backup schedule - Describe the interaction between Docker and Linux |
| Topic 6: Image Creation, Management, and Registry | 20% | - Give examples on how to create an efficient image via a Dockerfile - Describe how image layers work - Inspect images and report specific attributes using filter and format - Identify and display the main parts of a Dockerfile - Describe how to set up and use a local registry - Describe how an image registry works - Demonstrate tagging an image - Display layers of a Docker image - Apply a file to create a new image - Describe the use of Dockerfile - Use CLI commands such as list, delete, prune, rmi, etc. to manage images - Describe options, such as add, copy, volumes, expose, entry point - Utilize a registry to store an image |
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NEW QUESTION # 92
The following Docker Compose file is deployed as a stack:
Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.
Answer: B
NEW QUESTION # 93
In the context of a swarm mode cluster, does this describe a node?
Solution: an instance of the Docker engine participating in the swarm
Answer: B
Explanation:
In the context of a swarm mode cluster, an instance of the Docker engine participating in the swarm is indeed a node1. A node can be either a manager or a worker, depending on the role assigned by the swarm manager2. A manager node handles the orchestration and management of the swarm, while a worker node executes the tasks assigned by the manager2. A node can join or leave a swarm at any time, and the swarm manager will reconcile the desired state of the cluster accordingly1. Reference:
1: Swarm mode overview | Docker Docs
2: Manage nodes in a swarm | Docker Docs
NEW QUESTION # 94
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 unhealthy container is restarted.
Answer: B
Explanation:
A liveness probe is a mechanism for indicating your application's internal health to the Kubernetes control plane. Kubernetes uses liveness probes to detect issues within your pods. When a liveness check fails, Kubernetes restarts the container in an attempt to restore your service to an operational state1. Therefore, the action taken by the orchestrator to fix the unhealthy container is to restart it. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* A Practical Guide to Kubernetes Liveness Probes | Airplane
NEW QUESTION # 95
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: B
Explanation:
Explanation
Using kubectl describe deployment api displays the events table for this object. The kubectl describe command shows detailed information about a resource, including its status and events. This command can be used to troubleshoot a deployment that is not working as expected. References:
https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#describe
NEW QUESTION # 96
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run -v /data:/mydata --mode readonly ubuntu'
Answer: B
Explanation:
= The command docker run -v /data:/mydata --mode readonly ubuntu is not valid because it has some syntax errors. The correct syntax for running a container with a bind mount is docker run [OPTIONS] IMAGE [COMMAND] [ARG...]. The errors in the command are:
The option flag for specifying the volume is --volume or -v, not -v. For example, -v /data:/mydata should be --volume /data:/mydata.
The option flag for specifying the mode of the volume is --mount, not --mode. For example, --mode readonly should be --mount type=bind,source=/data,target=/mydata,readonly.
The option flag for specifying the mode of the container is --detach or -d, not --mode. For example, --mode readonly should be --detach.
The correct command for running a container with a bind mount in read-only mode is:
docker run --volume /data:/mydata --mount type=bind,source=/data,target=/mydata,readonly --detach ubuntu This command will run a container using the ubuntu image and mount the host's /data directory to the container's /mydata directory in read-only mode. The container will run in the background (--detach).
docker run reference | Docker Documentation : [Use bind mounts | Docker Documentation]
NEW QUESTION # 97
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