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NEW QUESTION # 160
A Linux administrator needs to change the execution frequency of a systemd timer. Which of the following commands should the administrator use after editing the timer file to make the changes effective?
Answer: C
Explanation:
After modifying a systemd unit file such as a timer, this command reloads systemd's configuration so the updated execution schedule is recognized and applied.
NEW QUESTION # 161
A Linux administrator just finished setting up passwordless SSH authentication between two nodes. However, upon test validation, the remote host prompts for a password. Given the following logs:
Which of the following is the most likely cause of the issue?
Answer: B
Explanation:
This issue is directly related to SELinux enforcement, which is a key topic in the Security domain of CompTIA Linux+ V8. The logs clearly indicate that SSH key-based authentication is failing due to an SELinux access control violation rather than a traditional file permission or SSH configuration problem.
The most important clue is the AVC denial message, which shows that the sshd process is being denied read access to the authorized_keys file. The security context of the file is listed as unconfined_u:object_r:
home_root_t:s0. Under a targeted SELinux policy, SSH is only permitted to read authorized_keys files that are labeled with the correct SELinux type, typically ssh_home_t.
Because SELinux is running in enforcing mode, it actively blocks access that violates policy rules, even if standard UNIX permissions are correct. Although the file permissions (600) are acceptable for an authorized_keys file, SELinux does not rely solely on traditional permissions. The mismatch between the expected SELinux context and the actual context prevents sshd from accessing the file, causing SSH to fall back to password authentication.
Option D correctly identifies the root cause: the authorized_keys file does not have the correct SELinux security context. This is a well-documented Linux+ V8 troubleshooting scenario, commonly resolved by restoring the correct context using commands such as restorecon or by ensuring the file resides in a properly labeled home directory.
The other options are incorrect. Restarting sshd does not fix SELinux labeling issues. The policy itself is functioning as intended, and file ownership alone does not override SELinux access controls.
Linux+ V8 documentation emphasizes that SELinux denials must be addressed by correcting file contexts rather than weakening security controls. Therefore, the correct answer is D.
NEW QUESTION # 162
Which of the following technologies is used to authenticate users on a Linux server when working in a Windows domain?
Answer: A
Explanation:
Kerberos provides centralized, ticket-based authentication and is the core authentication mechanism used by Windows Active Directory, allowing Linux systems joined to a Windows domain to authenticate users securely.
NEW QUESTION # 163
A Linux administrator receives reports about MySQL service availability issues. The administrator observes the following information:
uptime -p shows the system has been up for only 2 minutes
journalctl shows messages indicating:
mysqld invoked oom-killer
mysqld cpuset=/ mems_allowed=0
Which of the following explains why the server was offline?
Answer: C
Explanation:
This scenario clearly indicates a memory exhaustion condition, which falls under the Troubleshooting domain of the CompTIA Linux+ V8 objectives. The most critical clue is the log entry stating that mysqld invoked oom-killer.
The OOM (Out-Of-Memory) killer is a Linux kernel mechanism that activates when the system runs critically low on available memory and cannot satisfy memory allocation requests. When this happens, the kernel selects a process-typically one consuming a large amount of memory-and forcibly terminates it to protect overall system stability. In this case, the MySQL daemon (mysqld) was identified as the process responsible for triggering the OOM condition.
The journalctl output explicitly confirms this behavior. Linux+ V8 documentation emphasizes that when the OOM killer is invoked, it is almost always due to physical memory exhaustion or insufficient swap space, not user intervention or application bugs alone. The additional log line showing mems_allowed=0 further supports the conclusion that the process could not allocate memory from available memory nodes.
The fact that uptime -p reports only 2 minutes of uptime strongly suggests that the system was either rebooted automatically or manually following the memory exhaustion event. Systems may reboot as part of recovery procedures after severe resource exhaustion, especially in production environments.
The other options can be ruled out. There is no indication of a user-initiated kill signal, filesystem corruption, or network connectivity issues. Network outages would not generate OOM killer messages, and filesystem errors would appear as I/O or disk-related errors in the logs.
Linux+ V8 best practices recommend addressing OOM issues by increasing system memory, tuning MySQL memory parameters, configuring swap space, or adjusting OOM scoring.
Therefore, the correct explanation is A. The process exhausted server memory.
NEW QUESTION # 164
An administrator wants to start an Ubuntu terminal in a container. Which of the following will allow the administrator to complete the task?
Answer: C
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 # 165
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