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Test Number : DCA
Test Name : Docker Certified Associate
Vendor Name : Misc
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Exam ID : DCA
Exam Title : Docker Certified Associate
Questions : 55
Duration : 90 minutes
Exam Type : multiple choice

Recognition for your Docker skills with an official Docker credential
Digital certificate and use of the Docker Certified Associate logo
Online verification of Docker Certified status by potential employers
Exclusive access to the Docker Certified professional network on LinkedIn and invites to certified-only events

55 multiple choice questions in 90 minutes
Designed to validate professionals with a minimum of 6 to 12 months of Docker experience
Remotely proctored on your Windows or Mac computer
Available globally in English
Results delivered immediately

This examination is based upon critical job activities a Docker Certified Associate performs. The skills and knowledge certified by this examination represent a level of expertise where a certified Docker Associate can:
=> Run containerized applications from pre-existing images stored in a centralized registry
=> Deploy images across the cluster
=> Triage and resolve issue reports from stakeholders and resolve
=> Standup up on Enterprise clusters with one UCP manager, one DTR replica, and one worker node
=> Migrate traditional applications to containers
=> Configure and troubleshoot Docker engine
=> Perform general maintenance and configuration
Candidates for this certification should have at least six months to one year of experience with Docker, including exposure to the Docker Enterprise Edition. The knowledge, skills and experience required at this level should also include:
=> container security
=> experience with at least one cloud provider
=> configuration management tools
=> Linux and/or Windows Server

Orchestration 25%
Image Creation, Management, and Registry 20%
Installation and Configuration 15%
Networking 15%
Security 15%
Storage and Volumes 10%

Domain 1: Orchestration (25% of exam)
Content may include the following:
=> Complete the setup of a swarm mode cluster, with managers and worker nodes
=> Describe and demonstrate how to extend the instructions to run individual containers into running services under swarm.
=> Describe the importance of quorum in a swarm cluster.
=> Describe the difference between running a container and running a service.
=> Interpret the output of “docker inspect” commands.
=> Convert an application deployment into a stack file using a YAML compose file with "docker stack deploy"
=> Manipulate a running stack of services.
=> Describe and demonstrate orchestration activities.
=> Increase the number of replicas.
=> Add networks, publish ports.
=> Mount volumes.
=> Describe and demonstrate how to run replicated and global services.
=> Apply node labels to demonstrate placement of tasks.
=> Describe and demonstrate how to use templates with “docker service create”.
=> Identify the steps needed to troubleshoot a service not deploying.
=> Describe how a Dockerized application communicates with legacy systems.
=> Describe how to deploy containerized workloads as Kubernetes pods and deployments.
=> Describe how to provide configuration to Kubernetes pods using configMaps and secrets.

Domain 2: Image Creation, Management, and Registry (20% of exam)
Content may include the following:
=> Describe the use of Dockerfile.
=> Describe options, such as add, copy, volumes, expose, entry point.
=> Identify and display the main parts of a Dockerfile.
=> Describe and demonstrate how to create an efficient image via a Dockerfile.
=> Describe and demonstrate how to use CLI commands to manage images, such as list, delete, prune, rmi.
=> Describe and demonstrate how to inspect images and report specific attributes using filter and format
=> Describe and demonstrate how to tag an image.
=> Describe and demonstrate how to apply a file to create a Docker image.
=> Describe and demonstrate how to display layers of a Docker image
=> Describe and demonstrate how to modify an image to a single layer.
=> Describe and demonstrate registry functions.
=> Deploy a registry.
=> Log into a registry.
=> Utilize search in a registry.
=> Push an image to a registry.
=> Sign an image in a registry.
=> Pull and delete images from a registry.

Domain 3: Installation and Configuration (15% of exam)
Content may include the following:
=> Describe sizing requirements for installation.
=> Describe and demonstrate the setup of repo, selection of a storage driver, and installation of the Docker engine on multiple platforms.
=> Describe and demonstrate configuration of logging drivers (splunk, journald, etc.).
=> Describe and demonstrate how to set up swarm, configure managers, add nodes, and setup the backup schedule.
=> Describe and demonstrate how to create and manage user and teams.
=> Describe and demonstrate how to configure the Docker daemon to start on boot.
=> Describe and demonstrate how to use certificate-based client-server authentication to ensure a Docker daemon has the rights to access images on a registry.
=> Describe the use of namespaces, cgroups, and certificate configuration.
=> Describe and interpret errors to troubleshoot installation issues without assistance.
=> Describe and demonstrate the steps to deploy the Docker engine, UCP, and DTR on AWS and on-premises in an HA configuration. => Describe and demonstrate how to configure backups for UCP and DTR.

Domain 4: Networking (15% of exam)
Content may include the following:
=> Describe the Container Network Model and how it interfaces with the Docker engine and network and IPAM drivers.
=> Describe the different types and use cases for the built-in network drivers.
=> Describe the types of traffic that flow between the Docker engine, registry and UCP controllers.
=> Describe and demonstrate how to create a Docker bridge network for developers to use for their containers.
=> Describe and demonstrate how to publish a port so that an application is accessible externally.
=> Identify which IP and port a container is externally accessible on.
=> Compare and contrast “host” and “ingress” publishing modes.
=> Describe and demonstrate how to configure Docker to use external DNS.
=> Describe and demonstrate how to use Docker to load balance HTTP/HTTPs traffic to an application (Configure L7 load balancing with Docker EE).
=> Understand and describe the types of traffic that flow between the Docker engine, registry, and UCP controllers
=> Describe and demonstrate how to deploy a service on a Docker overlay network.
=> Describe and demonstrate how to troubleshoot container and engine logs to resolve connectivity issues between containers.
=> Describe how to route traffic to Kubernetes pods using ClusterIP and NodePort services.
=> Describe the Kubertnetes container network model.

Domain 5: Security (15% of exam)
Content may include the following:
=> Describe security administration and tasks.
=> Describe the process of signing an image.
=> Describe default engine security.
=> Describe swarm default security.
=> Describe MTLS.
=> Describe identity roles.
=> Compare and contrast UCP workers and managers.
=> Describe the process to use external certificates with UCP and DTR.
=> Describe and demonstrate that an image passes a security scan.
=> Describe and demonstrate how to enable Docker Content Trust.
=> Describe and demonstrate how to configure RBAC with UCP.
=> Describe and demonstrate how to integrate UCP with LDAP/AD.
=> Describe and demonstrate how to create UCP client bundles.

Domain 6: Storage and Volumes (10% of exam)
Content may include the following:
=> Identify the correct graph drivers to uses with various operating systems.
=> Describe and demonstrate how to configure devicemapper.
=> Compare and contrast object and block storage and when they should be used.
=> Describe how an application is composed of layers and where these layers reside on the filesystem.
=> Describe the use of volumes are used with Docker for persistent storage.
=> Identify the steps to take to clean up unused images on a filesystem and DTR.
=> Describe and demonstrate how storage can be used across cluster nodes.
=> Describe how to provision persistent storage to a Kubernetes pod using persistentVolumes.
=> Describe the relationship between container storage interface drivers, storageClass, persistentVolumeClaim and volume objects in Kubernetes.

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Misc Docker techniques

the way to Use Docker To pass assemble For Raspberry Pi (and extra) | DCA Latest Questions and PDF Dumps

It used to be tedious to deploy a go assemble ambiance. certain that you may collect on the Raspberry Pi itself, but once in a while you wish to use your big computing device — and you can use it when your Pi isn't available like when on an airplane with a computer. It will also be tricky to deploy a pass compiler for any construct equipment, but if you go through one fundamental step, it turns into tremendous handy despite what your true desktop feels like. That one step is to deploy Docker.

Docker is available for Linux, windows, and Mac OS. It enables developers to construct pictures that are almost preconfigured Linux environments that run some carrier. Like a virtual computing device, these images can run collectively with out interfering with each other. in contrast to a digital laptop, Docker containers (the operating application) are lightweight because they share the same underlying kernel and hardware of the desktop.

The truth is, setting up the Raspberry Pi construct ambiance isn’t any less demanding. It is barely that with Docker, someone else has already done the be just right for you and you can automatically seize their setup and keep on so far. when you are already working Linux, your kit manager probably makes the method fairly handy too (see [Rud Merriam’s] post on that technique). however, the pleasant aspect in regards to the photographs is it's a complete isolated ambiance that may move from laptop to laptop and from platform to platform (the home windows and Mac platforms use numerous techniques to run the Linux utility, but it surely is finished transparently).

installing Docker

if you don't seem to be using Linux, you’ll need to determine the way to install Docker. There are several how to do it under windows (reckoning on what edition of home windows you use) and i don’t use the Mac. youngsters, on Linux, you should be in a position to deploy what you want by way of your kit supervisor.

In Ubuntu and different equivalent distributions, you could predict to install the Docker package. Makes experience, however no. That package is a device tray icon manager. What you need is

sudo apt-get deploy

You’ll see some advised applications, and you'll consider adding the –set up-suggests alternative to apt-get in case you desire them.

Docker is in two parts: a daemon (a server that runs within the heritage) and a client named docker. There are numerous GUI tools to control Docker in case you don’t just like the command line. I do find it irresistible, so that’s all i know about that.

pass bring together

Docker maintains a repository of photos on their site referred to as the Hub. by way of default, in case you don’t have a picture in the community, the customer will seem to be there for it. in this particular case, the photograph you want is sdthirlwall/raspberry-pi-move-compiler:legacy-trusty. That’s a mouthful, and the developer provides a nice script for calling it beneath general circumstances. How do you get the script? you utilize Docker, of route.

by the way, by default, you should run the Docker client as root, despite the fact that you can also create a distinct community (youngsters the usage of sudo works just as well). here’s the command to run to get the rpxc script:

sudo docker run sdthirlwall/raspberry-pi-go-compiler:legacy-trusty >rpxc

when you consider that you likely don’t have that photo on your complicated force, it is going to take a while for the customer to down load it and complete the task. subsequent time gained’t take so long because Docker could have a local replica.

that you may set the rpxc command to execute with this command:

chmod +x rpxc

Then flow it somewhere on your route (or check with it by full course like ./rpxc or ~/Downloads/rpxc, if you pick). youngsters you could obtain the complete picture from the Hub, if you wish to look at the information, make contributions, or observe development, be sure to have a glance on the GitHub repo for the undertaking.

In Use

The rpxc script frequently runs any command you love within the new environment. for the reason that it runs Docker, you should be root or within the Docker group, of path. all of the ordinary build equipment are prefixed with rpxc, so:

rpxc rpxc-gcc -o whats up-world hi there-world.c

Or, when you have a Makefile:

rpxc make

The latest listing you're in should you run rpxc, turns into the /build listing in the new ambiance and is the default current working directory.

when you are lazy, you could favor to just run:

rpxc bash

Then that you could difficulty instructions and do what you adore. Do an ls on /usr/local/bin/rpxc* to peer the entire equipment purchasable. that you would be able to additionally use the rpxc script to update the photo and itself. Use the replace command to do both, otherwise you can specify replace-photograph or update-script.


There are other photographs you could find exciting. You should get a free account on the Hub, and when you do, you could think there's a really small variety of photographs. besides the fact that children, try doing a seek Raspberry, for instance. Or Arduino, which suggests lots of preconfigured Arduino environments. You may get pleasure from looking for ESP8266, too. There’s even a Docker graphic for Eagle PCB layout software. tell us your favourite profiles within the comments beneath.

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