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NEW QUESTION # 132
An administrator wants to start an Ubuntu terminal in a container. Which of the following will allow the administrator to complete the task?
Answer: B
Explanation:
The correct answer is B. docker run -it ubuntu because it is the standard command used to start an interactive terminal session inside a new Ubuntu container. The docker run command creates and starts a container from a specified image. The -it flags are critical here: -i keeps STDIN open (interactive mode), and -t allocates a pseudo-terminal, allowing the user to interact with the container as if it were a regular shell session.
When executed, Docker will first check if the ubuntu image exists locally. If it does not, Docker will automatically pull it from the default registry (Docker Hub). Once the image is available, the container is launched and provides access to a shell (typically /bin/bash or /bin/sh) inside the Ubuntu environment.
Option A is incorrect because podman pull ubuntu /bin/bash is not valid syntax. The pull command is only used to download images and does not execute a shell.
Option C is incorrect because containerd is a low-level container runtime and is not typically used directly with such syntax to start interactive containers.
Option D is incorrect because runc exec is used to execute commands in an already running container, not to start a new container. Additionally, it requires a container ID rather than an image name.
From a Linux+ perspective, understanding container lifecycle commands is essential for automation and orchestration. The docker run -it command is fundamental for testing, debugging, and interacting with containerized environments, making it a key skill for administrators working with modern infrastructure.
NEW QUESTION # 133
A Linux systems administrator is running an important maintenance task that consumes a large amount of CPU, causing other applications to slow. Which of the following actions should the administrator take to help alleviate the issue?
Answer: B
Explanation:
Process scheduling and resource management are essential Linux administration skills covered in Linux+ V8.
When a process consumes excessive CPU resources, it can negatively impact overall system performance.
The correct solution is to lower the priority of the CPU-intensive task using the renice command. Niceness values influence how much CPU time a process receives relative to others. Increasing the niceness value reduces the process's priority, allowing other applications to receive CPU resources more fairly.
Option B directly addresses the issue. The other options do not. pidstat monitors processes but does not modify CPU allocation. nohup allows a process to continue running after logout but does not affect scheduling priority. bg resumes a stopped job in the background but does not reduce CPU usage.
Linux+ V8 documentation explicitly references nice and renice for managing CPU contention. Therefore, the correct answer is B.
NEW QUESTION # 134
A Linux administrator wants to make the ENABLE_AUTHvariable set to 1 and available to the environment of subsequently executed commands. Which of the following should the administrator use for this task?
Answer: A
Explanation:
The export command sets an environment variable and makes it available to subsequently executed commands and child processes, ensuring ENABLE_AUTH=1 is recognized system- wide in that shell session.
NEW QUESTION # 135
While reviewing local accounts on a server, a Linux administrator discovers that multiple users have not changed their passwords in more than a year. Which of the following commands should the administrator execute to bring the users' accounts into compliance with the 90-day guideline?
Answer: D
Explanation:
The chage command is used to manage password aging policies, and setting the maximum password age to 90 days enforces the required password change interval for user accounts.
NEW QUESTION # 136
A systems administrator is preparing a Linux system for application setup. The administrator needs to create an environment variable with a persistent value in one of the user accounts. Which of the following commands should the administrator use for this task?
Answer: B
Explanation:
Environment variables are widely used in Linux systems to configure application behavior, and Linux+ V8 emphasizes the distinction between temporary and persistent variables. A variable is persistent only if it is defined in a shell initialization file.
The correct approach is echo "export VAR=value" >> ~/.bashrc. This command appends the variable definition to the user's .bashrc file, ensuring the variable is set automatically every time the user starts a new shell session. This makes the variable persistent for that specific user.
Options B and C only define variables in the current shell session and are lost when the session ends. Option A incorrectly targets the SSH configuration directory and is not appropriate for defining shell environment variables.
Linux+ V8 documentation highlights .bashrc, .bash_profile, and /etc/profile as correct locations for persistent environment variables. Therefore, the correct answer is D.
NEW QUESTION # 137
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