Most Recent Docker DCA Exam Dumps

= Seccomp is a Linux kernel feature that allows you to restrict the actions available within the container. By using a seccomp profile, you can limit the system calls that a container can make, thus enhancing its security and isolation. Docker has a default seccomp profile that blocks some potentially dangerous system calls, such as mount, reboot, or ptrace. You can also pass a custom seccomp profile for a container using the--security-optoption. Seccomp can limit a container's access to host resources, such as CPU or memory, by blocking or filtering system calls that affect those resources, such as setpriority, sched_setaffinity, or mlock.Reference:

Seccomp security profiles for Docker

Hardening Docker Container Using Seccomp Security Profile

= The conditions are sufficient for Kubernetes to dynamically provision a persistentVolume, because a storageClass defines the provisioner and parameters for creating a volume on-demand. A persistentVolumeClaim that specifies a storageClass triggers the dynamic provisioning process, and Kubernetes will automatically create and bind a persistentVolume that matches the request. This eliminates the need for manual intervention by cluster administrators to provision storage volumes.Reference:

Dynamic Volume Provisioning | Kubernetes

Persistent volumes and dynamic provisioning | Google Kubernetes Engine ...

Dynamic Provisioning and Storage Classes in Kubernetes

They provide granular control over where pods (or in this case, containers) are scheduled, based on the labels of the nodes1.In the context of Docker Swarm, this means that you could use node affinities to ensure that development and production containers are scheduled on separate nodes, thus meeting the company's security policy requirements12345.

= The commanddocker service create --network --securewill not ensure that overlay traffic between service tasks is encrypted.This is because the--secureoption is not a valid option for thedocker service createcommand1.To ensure that overlay traffic between service tasks is encrypted, you need to use the--opt encryptedoption when creating the overlay network with thedocker network createcommand2. For example, to create an encrypted overlay network namedmy-net, you can use the following command:

docker network create --driver overlay --opt encrypted my-net

Then, you can use the--network my-netoption when creating the service with thedocker service createcommand3. For example, to create a service namedmy-serviceusing thenginximage and themy-netnetwork, you can use the following command:

docker service create --name my-service --network my-net nginx

:

docker service create | Docker Docs

Use overlay networks | Docker Docs

Create a service | Docker Docs

= The commandkubectl describe deployment apidisplays the events table for the deployment object called api, along with other information such as labels, replicas, strategy, conditions, and pod template. The events table shows the history of actions that have affected the deployment, such as scaling, updating, or creating pods. This can help troubleshoot any issues with the deployment. To see only the events table, you can use the flag--show-events=truewith the command.Reference:

Deployments | Kubernetes

kubectl - How to describe kubernetes resource - Stack Overflow

Kubectl: Get Deployments - Kubernetes - ShellHacks

kubernetes - Kubectl get deployment yaml file - Stack Overflow