CompTIA XK0-005 Practice Test - Questions Answers, Page 24

To apply changes to a systemd service unit file, the administrator needs to reload the systemd daemon using the commandsystemct1 daemon-reload(B). This will make systemd aware of the new or changed unit files. The other commands will not reload the systemd daemon or apply the changes.Reference:

[CompTIA Linux+ Study Guide], Chapter 7: Managing System Services, Section: Modifying Systemd Services

[How to Reload Systemd Services]

To launch an Nginx image container, name it Web001, and expose port 8080 externally while mapping to port 80 inside the container, the administrator can use the commanddocker run -it -p 8080:80 --name Web001 nginx. This will create and start a new container from the Nginx image, assign it a name of Web001, and map port 8080 on the host to port 80 on the container. The other commands are not valid or do not meet the requirements.Reference:

[CompTIA Linux+ Study Guide], Chapter 11: Working with Containers, Section: Running Containers with Docker

[How to Run Docker Containers]

To unlock an account that has been locked due to login failures, the administrator can use the commandpam_tally2 --user=dev2 --reset(D). This will reset the failure counter for the user ''dev2'' and allow the user to log in again. The other commands will not unlock the account, but either display or increase the failure count.Reference:

[CompTIA Linux+ Study Guide], Chapter 4: Managing Users and Groups, Section: Locking Accounts with pam_tally2

[How to Lock and Unlock User Account in Linux]

To delete a file from a Git repository, the administrator can use the commandgit rm app.conf(D). This will remove the file ''app.conf'' from the working directory and stage it for deletion from the repository. The administrator can then commit the change withgit commit -m 'Delete app.conf'to finalize the deletion. The other commands will not delete the file, but either tag, commit, or checkout the file.Reference:

[CompTIA Linux+ Study Guide], Chapter 10: Working with Git, Section: Deleting Files with Git

[How to Delete Files from Git]

To retrieve the scripts from a repository and make them available on a local workstation, the junior Linux administrator can use the commandgit clone. This will create a copy of the repository on the local machine, including all the scripts and history. The other commands will not clone the repository, but either fetch, checkout, or branch from an existing repository.Reference:

[CompTIA Linux+ Study Guide], Chapter 10: Working with Git, Section: Cloning Repositories with Git

[How to Clone a Git Repository]

To allow the same Kubernetes container configurations to be deployed in different environments without statically configuring custom locations, the engineer can use an ambassador container (D). An ambassador container is a proxy container that handles communication between containers and external services. It can dynamically configure locations based on environment variables or other methods. The other options are not related to this requirement.Reference:

[CompTIA Linux+ Study Guide], Chapter 11: Working with Containers, Section: Using Ambassador Containers

[How to Use Ambassador Containers]

The /etc/sudoers file is used to configure the sudo command, which allows non-privileged users to execute commands that require elevated account permissions1. The file contains a list of users and groups that are allowed to use sudo, and the commands they can run with it. The file also defines the security policy for sudo, such as whether a password is required, how long the sudo session lasts, and what environment variables are preserved or reset.

The /etc/passwd file is used to store information about the user accounts on the system, such as their username, user ID, home directory, and login shell. The /etc/shadow file is used to store the encrypted passwords for the user accounts, along with other information such as password expiration and aging. These files are not directly related to the sudo command, and updating them will not grant a user elevated account permissions.

The /etc/bashrc file is used to set up the environment for the bash shell, such as aliases, functions, variables, and options. This file is executed whenever a new bash shell is started, and it affects all users on the system. However, this file does not control the sudo command or its configuration, and updating it will not allow a user to use commands that require elevated account permissions.

The docker build command is used to build an image from a Dockerfile and a context1.The Dockerfile is a text file that contains the instructions for creating the image, and the context is a set of files that can be used in the image creation process1. The file that the developer received is an example of a Dockerfile.

The -t option is used to specify a name and an optional tag for the image1.The name and tag are separated by a colon (:), and the tag is usually used to indicate the version of the image2. For example, -t myimage:1.0 means that the image will be named myimage and tagged as 1.0.

The last argument of the docker build command is the path to the context, which can be a local directory or a URL1.The dot (.) means that the current working directory is the context2. Therefore, docker build -t myimage:1.0 . means that the image will be built from the Dockerfile and the files in the current working directory, and it will be named myimage and tagged as 1.0.

The snap list command is used to display the installed snaps on the system1.Snaps are self-contained software packages that can be installed and updated across different Linux distributions2.The snap list command shows the name, version, revision, developer and notes of each snap1.

The snap find command is used to search for snaps in the Snap Store, which is an online repository of snaps2.The snap install command is used to install snaps from the Snap Store or from a local file2.The snap try command is used to test a snap without installing it, by mounting a directory that contains the snap files2. These commands are not useful for verifying if a package was installed using a snap.