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NEW QUESTION # 107
To perform a live migration, which of the following must match on both host servers? (Choose two)
Answer: B,F
Explanation:
Live migration is a virtualization feature that allows a running virtual machine to be moved from one host to another with minimal or no downtime. This topic falls under System Management in the CompTIA Linux+ V8 objectives, particularly in the areas of virtualization and resource management.
For a live migration to succeed, the CPU architecture must match between the source and destination hosts.
This is critical because the running virtual machine's CPU state, instruction set, and registers must be compatible with the destination system. Migrating between different CPU architectures (for example, x86_64 to ARM) is not supported and would cause the virtual machine to fail. Therefore, option D is required.
Additionally, the destination host must have sufficient available memory to accommodate the virtual machine being migrated. During live migration, the memory contents of the running VM are copied from the source host to the destination host while the VM continues to run. If enough memory is not available, the migration cannot complete successfully. This makes option E mandatory.
The other options are not strict requirements. USB ports do not need to match for live migration. Network speed may affect migration performance but does not need to be identical. Available swap space is not directly required for migration. Disk storage paths do not need to match as long as shared storage or compatible storage access is available.
Linux+ V8 documentation emphasizes CPU compatibility and memory availability as core prerequisites for live migration. Therefore, the correct answers are D and E.
NEW QUESTION # 108
Which of the following formats is used to write an Ansible playbook?
Answer: C
Explanation:
Ansible playbooks are written in YAML, which provides a human-readable, structured format used to define plays, tasks, variables, and roles for automation.
NEW QUESTION # 109
A Linux engineer needs to record new changes completed on a Git repository. Which of the following commands should the engineer use?
Answer: B
Explanation:
This command records the staged changes in the local repository by creating a new commit, preserving a snapshot of the work and its history.
NEW QUESTION # 110
Application owners are reporting that their application stops responding after several days of running, and they need to restart it. A Linux administrator obtains the following details from the dmesg command:
invoked oom-killer
Call Trace:
out_of_memory
oom_kill_process
The application owners mentioned that resources to the system have been increased, and the error takes longer to appear. Which of the following best describes the reason the process is being terminated by OOM?
Answer: B
Explanation:
The correct answer is C. The application might have a memory leak because the dmesg output clearly shows that the Linux kernel is invoking the OOM (Out Of Memory) killer, which terminates processes when the system runs out of available memory. The presence of entries such as invoked oom-killer, out_of_memory, and oom_kill_process confirms that the system is exhausting its memory resources over time.
A key detail in the scenario is that the application runs for several days before failing, and when system resources (RAM) are increased, the issue takes longer to occur. This behavior is a classic indicator of a memory leak, where an application gradually consumes more memory without releasing it. Instead of stabilizing, memory usage continuously grows until it reaches the system limit, at which point the OOM killer terminates the process to prevent system instability.
Option A (CPU type is incompatible) is incorrect because CPU incompatibility would cause immediate execution failures, not delayed memory exhaustion. Option B (kernel panic) is incorrect because a kernel panic would crash the entire system, not selectively terminate a user-space process. Option D (swap configuration not correctly sized) is partially plausible but not the best answer; while insufficient swap can contribute to OOM conditions, it does not explain the gradual memory consumption pattern observed.
In Linux+ troubleshooting, identifying memory leaks is critical when dealing with long-running applications.
Administrators should monitor memory usage using tools like top, htop, or ps, and investigate application behavior. Applying patches, optimizing code, or restarting services periodically are common mitigation strategies, along with configuring appropriate memory and swap resources.
NEW QUESTION # 111
A Linux administrator needs to change the server name to comptia1. Which of the following commands should the administrator use?
Answer: C
Explanation:
The standard tool for managing the system hostname on modern Linux distributions using systemd is hostnamectl. According to the CompTIA Linux+ V8 objectives, the command hostnamectl set-hostname < name > is the correct and permanent way to change the server ' s identity.
When an administrator runs hostnamectl set-hostname comptia1, the utility updates the various types of hostnames recognized by the system:
* Static Hostname: This is stored in /etc/hostname and persists across reboots.
* Transient Hostname: A temporary name received via network configuration (like DHCP).
* Pretty Hostname: A high-level, human-readable name that can include special characters.
Using hostnamectl is preferred over manually editing /etc/hostname because it immediately notifies the kernel and running services of the change, often without requiring a reboot to take effect system-wide.
The other options are incorrect. Option A, export HOSTNAME=comptia1, only changes the environment variable for the current shell session; it does not change the system ' s actual hostname and is lost when the session ends. Option B, adding the name to /etc/resolv.conf, is incorrect because that file is used for DNS resolver settings (nameservers and search domains), not for the local system ' s hostname. Option D, systemctl daemon-reload, is used to refresh systemd after configuration changes to unit files and has no functionality for changing a hostname.
Therefore, hostnamectl is the verified command for this task.
NEW QUESTION # 112
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