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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 Associate dumps

Linux Fu: Watch That Filesystem | DCA question bank and test dumps

The UNIX way™ is to cobble together distinctive, single-purpose classes to get the impact you need, as an example in a Bash script that you simply run by typing its identify into the command line. but sometimes you want the equipment to react to changes within the device devoid of your intervention. for example, you could want to watch a directory and kick off some program instantly when a file seems from a completed FTP transaction, without needing to take a seat there and refresh the listing yourself.

The essential however ugly option to do that just scans the listing periodically. right here’s a very dumb shell script:

#!/bin/bash while authentic do for I in `ls` do cat $I; rm $I carried out sleep 10 carried out

only for an example, I dump the file to the console and take away it, but in real lifestyles, you’d do something extra wonderful. here is in reality now not a great script since it executes all of the time and it simply isn’t a really dependent solution. (if you feel I may still use for I in *, are trying doing that in an empty listing and also you’ll see why i take advantage of the ls command as an alternative.)

raise magnificence

honestly, you want something greater based correct? modern kernels (2.6.13 and later) have filesystem notifications within the kind of an interface called inotify. you could use these calls programmatically with the sys/inotify.h header file. there is additionally a collection of command-line courses that you can install, continually packaged as inotify-tools.

a type of equipment is inotifywait and it makes for a nicer script. as an instance:

#!/bin/bash while proper do if FN=`inotifywait –e close_write,moved_to --format %f .` then cat $FN rm $FN fi achieved

That’s stronger, I believe. It doesn’t wake up often, best when anything has modified. I determine any sane software putting some thing within the directory will either open the file for writing and close it, or it'll circulation it. either approach will work and the %f tells the command to file the file identify. There are other movements that you could look forward to as neatly, of direction.

if you're questioning why the move case is critical, believe about how most text editors and network get utility works. constantly, a new file doesn’t have the remaining identify unless it is complete. as an instance, Chrome will get the file look at various.txt as examine.txt.crdownload or whatever like that. most effective when the file is executed will it rename (flow) the file to look at various.txt.

in case you wish to are attempting the command and not using a script so that you can see the effect, just open up two terminal home windows like this:

within the lessen terminal, problem the inotifywait command. Don’t overlook the period on the conclusion which tells it to display screen the existing directory. Then within the other terminal create a file in the identical directory. The name of the file will appear within the first terminal and the software will exit. The script just takes expertise of this habits to set the FN variable, takes motion, after which relaunches inotifywait. that you would be able to ask the application now not to quit, by the way, however that makes scripting a bit extra problematic. however, it additionally eliminates the issue of a file changing while you're doing all your processing.

The other command line, inotifywatch, additionally outputs file trade hobbies but it watches for a certain quantity of time and then gives you a abstract of adjustments. I received’t talk about it any further. if you believe you want that skill, that you could examine the man web page.

a brand new Cron

The script continues to be under optimal, even though. most likely, a system may have loads of distinct directories it wants to monitor. You in reality don’t need to repeat this script, or a edition of it, for each and every case.

there is one other application for that, called incron (you're going to pretty much absolutely have to deploy this one). The incron application is like cron however as a substitute of time-primarily based events, the hobbies are in accordance with file notifications. once you install it, you will doubtless ought to alternate /and so forth/incron.enable and /etc/incron.deny if you are looking to truly use it, especially as a traditional person.

think you need to run a script when a file seems in the hexfiles listing. that you would be able to use the command incrontab -e to edit your incron desk. The format is terribly choosy (it wants areas, now not tabs, as an instance). here’s a line from the file so as to do the job:

/domestic/alw/Downloads/hexfiles IN_CLOSE_WRITE,IN_MOVED_TO /domestic/alw/bin/program_cpu $@/$#

The $@/$# on the end gives a full route to the file affected. you can also grab the vent time as textual content ($%) or a number ($&). you can display screen all the typical activities and also set options to do issues like not dereference symbolic hyperlinks. that you could discover it all in the incron man pages.


I’m no longer a huge fan of GUI editors, however i know I’m within the minority. in case you like, there’s a Java-based incrontab editor attainable. There isn’t a whole lot documentation, however which you can import your incrontab — if it exists — from /var/spool/incron/your_user_id. in case you look on the image below, which you can see it offers a kind that builds the incron desk line for you.

you could locate the equipment files in /and so on/incron.d, continually. all of the locations will also be set by way of the /and many others/incron.conf file, so if you aren’t certain where to appear or you need to exchange the vicinity for the table data, start there.

Go Forth and Watch

the use of incron is quite dependent. A device program does all of the ready and their script only runs when necessary. it is effortless to seem and see the entire belongings you have notifications set for. that you could do plenty with these equipment, and never just in the embedded area. how will you use them?

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