Is this statement correct?Solution: A Dockerfile provides instructions for building a Docker image
Answer(s): A
: A Dockerfile is a text file that contains all the commands a user could run on the command line to create an image. A Dockerfile is composed of instructions that specify the parent image, the packages to install, the files to copy, the ports to expose, and the commands to run. A Dockerfile can be used to build a Docker image with the docker build command.
Dockerfile reference | Docker DocsWhat is a Dockerfile? A Step-by-Step Guide [2023 Updated] - SimplilearnHow to Build Docker Images with Dockerfile | Linuxize
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?Solution: inter-process communication
Answer(s): B
(Please check the official Docker site for the answer) Comprehensive = (Please check the officialDocker site for the comprehensive explanation)
(Some possible references from the web search results are)Docker Security - Docker DocumentationDocker Security Best Practices - MediumDocker Security Cheat Sheet - GitHubDocker Security: A Comprehensive Guide - SnykDocker Security: Tips and Tricks to Secure Your Containers - DevSecOpsI hope this helps you in your exam preparation. Good luck!
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?Solution: Linux capabilities
: = Linux capabilities are a way of restricting the privileges of a process or a container. By default, Docker containers run with a reduced set of capabilities, which means they cannot perform certain operations that require higher privileges, such as setting the system time. To allow a container to set the system time, you need to grant it the SYS_TIME capability by using the --cap-add option when running the container. For example, docker run --cap-add SYS_TIME alpine date -s 12:00 would set the system time to 12:00 inside the alpine container.
Docker Documentation, Runtime privilege and Linux capabilities, Change system date time in Docker containers without impacting host, Is it possible to change time dynamically in docker container?
Your organization has a centralized logging solution, such as Splunk.Will this configure a Docker container to export container logs to the logging solution?Solution: docker system events --filter splunk
= The solution will not configure a Docker container to export container logs to the logging solution, such as Splunk. The command docker system events --filter splunk is not a valid command to send logs to a remote destination. The --filter option for docker system events only accepts the following keys: container, daemon, event, image, label, network, plugin, type, and volume. splunk is not a valid key for filtering events. To configure a Docker container to export container logs to a logging solution, such as Splunk, you need to use the --log-driver and --log-opt options when creating or running the container. For example, to use the Splunk logging driver, you can use the following command:docker run --log-driver=splunk --log-opt splunk-token=176FCEBF-4CF5-4EDF-91BC-703796522D20 -- log-opt splunk-url=https://splunkhost:8088 ...This command will send the container logs to the Splunk HTTP Event Collector (HEC) endpoint specified by the splunk-url option, using the authentication token provided by the splunk- token option. You can also use other logging drivers, such as syslog, fluentd, gelf, etc., depending on your logging solution.
1: docker system events | Docker Docs2: Configure logging drivers | Docker Docs3: Splunk logging driver | Docker Docs4: Supported logging drivers | Docker Docs
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