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Will this command ensure that overlay traffic between service tasks is encrypted?
Solution:docker service create --network--encrypted
= The command docker service create --network --encrypted willnotensure that overlay traffic between service tasks is encrypted.This is because the --network flag requires an argument that specifies the name or ID of the network to connect the service to1.The--encrypted flag isnota valid option for docker service create2.To encrypt overlay traffic between service tasks, you need to use the --opt encrypted flag on docker network create when you create the overlay network3. For example:
docker network create --opt encrypted --driver overlay my-encrypted-network
Then, you can use the --network flag on docker service create to connect the service to the encrypted network. For example:
docker service create --network my-encrypted-network my-service
:
docker service create | Docker Documentation
docker service create | Docker Documentation
Manage swarm service networks | Docker Docs
I hope this helps you understand the command and the encryption, and how they work with Docker and swarm. If you have any other questions related to Docker, please feel free to ask me.
Will this configuration achieve fault tolerance for managers in a swarm?
Solution: one manager node for two worker nodes
Docker Swarm requires more than one manager node to achieve fault tolerance12.A single manager node is not fault tolerant because if it goes down, the entire cluster goes down3.For a swarm to be fault-tolerant, it needs to have an odd number of manager nodes2.For example, a three-manager swarm tolerates a maximum loss of one manager2.Therefore, a configuration with one manager node for two worker nodes will not achieve fault tolerance for managers in a swarm12.
You add a new user to the engineering organization in DTR.
Will this action grant them read/write access to the engineering/api repository?
Solution: Add the user directly to the list of users with read/write access under the repository's Permissions tab.
Adding a new user to the engineering organization in DTR will not automatically grant them read/write access to the engineering/api repository. This is because the repository permissions are not inherited from the organization level, but are configured separately for each repository. Therefore, to grant read/write access to the new user, you need to add them directly to the list of users with read/write access under the repository's Permissions tab.Reference:
Docker Trusted Registry - Manage access to repositories
Docker Certified Associate (DCA) Study Guide - Domain 3: Image Creation, Management, and Registry
https://docs.docker.com/ee/dtr/user/manage-repos/#manage-access-to-repositories
https://success.docker.com/certification/study-guides/dca-study-guide#domain-3-image-creation-management-and-registry-20-of-exam
An application image runs in multiple environments, with each environment using different certificates and ports. Is this a way to provision configuration to containers at runtime?
Solution.Create a Dockerfile for each environment, specifying ports and Docker secrets for certificates.
Creating a Dockerfile for each environment, specifying ports and Docker secrets for certificates is not a way to provision configuration to containers at runtime.A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image1. A Dockerfile is used to build an image, not to run a container. Once an image is built, the configuration specified in the Dockerfile cannot be changed at runtime.To provision configuration to containers at runtime, you need to use a different mechanism, such as environment variables, command-line arguments, or config maps234.Reference:
Dockerfile reference | Docker Docs
Environment variables in Compose | Docker Docs
Override the default command | Docker Docs
Configuration management with Containers | Kubernetes
Will this command mount the host's '/data* directory to the ubuntu container in read-only mode?
Solution. 'docker run -add-volume /data /mydata -read-only ubuntu'
= The commanddocker run -add-volume /data /mydata -read-only ubuntuwill not mount the host's/datadirectory to the ubuntu container in read-only mode. The reason is that the command has several syntax errors and invalid options.The correct command to mount a host directory to a container in read-only mode isdocker run --mount type=bind,source=/data,target=/mydata,readonly ubuntu12. The commanddocker run -add-volume /data /mydata -read-only ubuntuhas the following problems:
The option-add-volumeis not a valid option fordocker run.The valid options for mounting a volume or a bind mount are--mountor-v12.
The option-read-onlyis not a valid option fordocker run.The valid option for making the container's root filesystem read-only is--read-only3.However, this option will not affect the mounted volumes or bind mounts, which have their ownreadonlyoption12.
The argument/data /mydatais not a valid argument fordocker run.The argument fordocker runshould be the command to run inside the container, such asbashorping4.The source and target of the volume or bind mount should be specified in the--mountor-voption, separated by a colon12.
Therefore, the commanddocker run -add-volume /data /mydata -read-only ubuntuwill not work as intended, and will likely produce an error message or an unexpected result.Reference:
Use bind mounts
Use volumes
docker run
Docker run reference
