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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Image Creation, Management, and Registry | 20% | - Give examples on how to create an efficient image via a Dockerfile - Apply a file to create a new image - Describe how image layers work - Demonstrate tagging an image - Describe how to set up and use a local registry - Utilize a registry to store an image - Describe options, such as add, copy, volumes, expose, entry point - Describe how an image registry works - Display layers of a Docker image - Describe the use of Dockerfile - Use CLI commands such as list, delete, prune, rmi, etc. to manage images - Identify and display the main parts of a Dockerfile - Inspect images and report specific attributes using filter and format |
| Topic 2: Orchestration | 25% | - Demonstrate steps to lock a swarm cluster - Describe how to provide configuration to Kubernetes pods using configMaps and secrets - Interpret the output of "docker inspect" commands - Describe how to deploy containerized workloads as Kubernetes pods and deployments - Increase number of replicas - Complete the setup of a swarm mode cluster - Convert an application deployment into a stack file using a YAML compose file with "docker stack deploy" - Manipulate a running stack of services - State the differences between running a container vs running a service - Add networks, publish ports - Mount volumes - Describe the difference between global and replicated services - Describe how a Dockerized application communicates with legacy systems - Describe and demonstrate how to use replication mode - Extend the instructions to run individual containers into running services under swarm - Identify the steps needed to troubleshoot a service not deploying |
| Topic 3: Networking | 15% | - Configure Docker to use external DNS - 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 differences between "host" and "ingress" port publishing mode - Identify which IP and port a container is externally accessible on - 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 - Create a Docker bridge network for a developer to use for their containers - Describe the different types and use cases for the built-in network drivers |
| Topic 4: Storage and Volumes | 10% | - Describe the use of tmpfs for ephemeral storage - Describe how volumes work with containers - Describe the storage models available for DTR (NFS, local) - Describe how to use a volume plugin (local vs. NFS) - Describe the different graph driver storage backends - Identify the steps to take to clean up unused images on a filesystem and DTR |
| Topic 5: Installation and Configuration | 15% | - Outline the sizing requirements prior to installation - Describe the interaction between Docker and Linux - Create and manager user and teams - 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 - Describe namespaces, cgroups, and configuration of certificates - Use the install command to install DTR (Docker Trusted Registry) - Setup swarm, configure managers, add nodes, and setup the backup schedule - Configure logging drivers (splunk, journald, etc.) - Interpret errors to troubleshoot installation issues without assistance - Demonstrate the ability to upgrade the Docker engine |
| Topic 6: Security | 15% | - Describe identity roles - Describe MTLS - Describe the difference between UCP and DTR - Describe default engine security - Describe swarm default security - Describe the process to sign a Docker image - Describe the security architecture and responsibilities of the Docker EE platform - Describe MTLS and identity roles - Describe UCP and DTR integration with LDAP/AD - Enable Docker Content Trust - Configure RBAC with UCP - Compare the UCP workers and managers |
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NEW QUESTION # 47
What service mode is used to deploy a single task of a service to each node?
Answer: A
NEW QUESTION # 48
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: A
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 # 49
Which networking drivers allow you to enable multi-host network connectivity between containers?
Answer: C
Explanation:
The networking drivers that allow you to enable multi-host network connectivity between containers are bridge, macvlan, ipvlan, and overlay. These drivers create networks that can span multiple Docker hosts, and therefore enable containers on different hosts to communicate with each other. The other drivers, such as host, user-defined, and none, create networks that are either isolated or limited to a single host. Here is a brief overview of each driver and how it supports multi-host networking:
*bridge: The bridge driver creates a network that connects containers on the same host using a Linux bridge.
However, it can also be used to create a network that connects containers across multiple hosts using an external key-value store, such as Consul, Etcd, or ZooKeeper. This feature is deprecated and not recommended, as it requires manual configuration and has some limitations. The preferred driver for multi-host networking is overlay1.
*macvlan: The macvlan driver creates a network that assigns a MAC address to each container, making it appear as a physical device on the network. This allows the containers to communicate with other devices on the same network, regardless of the host they are running on. The macvlan driver can also use 802.1q trunking to create sub-interfaces and isolate traffic between different networks2.
*ipvlan: The ipvlan driver creates a network that assigns an IP address to each container, making it appear as a logical device on the network. This allows the containers to communicate with other devices on the same network, regardless of the host they are running on. The ipvlan driver can also use different modes, such as l2, l3, or l3s, to control the routing and isolation of traffic between different networks3.
*overlay: The overlay driver creates a network that connects multiple Docker daemons together using VXLAN tunnels. This allows the containers to communicate across different hosts, even if they are on different networks. The overlay driver also supports encryption, load balancing, and service discovery. The overlay driver is the default and recommended driver for multi-host networking, especially for Swarm services4.
References:
*Use bridge networks
*Use macvlan networks
*Use ipvlan networks
*Use overlay networks
NEW QUESTION # 50
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?
Solution. Set INSECURE_REGISTRY in the' /etc/docker/default' configuration file.
Answer: B
Explanation:
Explanation
Setting INSECURE_REGISTRY in the /etc/docker/default configuration file is a way to configure the Docker engine to use a registry without a trusted TLS certificate. The INSECURE_REGISTRY option allows you to specify one or more registries that do not have valid TLS certificates or use HTTP instead of HTTPS. This option bypasses the TLS verification for these registries and allows Docker to pull and push images from them without errors. However, this option is not recommended for production use as it exposes your registry communication to potential security risks. References: https://docs.docker.com/registry/insecure/,
https://docs.docker.com/engine/reference/commandline/dockerd/#insecure-registries
NEW QUESTION # 51
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker service create myorg/myimage:1.0
Answer: B
Explanation:
When content trust is enabled, Docker blocks any command that operates on unsigned images, such as docker service create. This is because Docker Content Trust (DCT) allows users to verify the integrity and publisher of specific image tags, using digital signatures stored on a Notary server. If an image tag is not signed, or the signature cannot be verified, Docker will refuse to pull, run, or build with that image. Therefore, if myorg/myimage:1.0 is unsigned, Docker will block the command docker service create myorg/myimage:1.0 and display an error message. References:
* Content trust in Docker
* Docker Content Trust: What It Is and How It Secures Container Images
* Automation with content trust
NEW QUESTION # 52
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