LPI 701-100 - DevOps Tools Engineer

C. Ansible allows accessing variables using the dictionary-style syntax myapp['option1'].

D. Alternatively, dot notation can be used to access nested variables: myapp.option1.

References: Ansible Documentation - Variables

The register keyword in an Ansible playbook is used to store the result of a task in a variable. This allows subsequent tasks to use the results of previous tasks.

References: Ansible Documentation - Playbooks

In Git, several commands are used to manage files within a repository. These include adding, removing, and moving files. The correct commands for managing files as per the options given are:

git rm: This command removes files from the working directory and the index (staging area). This is used to delete files from the repository.

git mv: This command moves or renames files in the working directory and the index. This is essentially a combination of git rm (remove) and git add (add) in one command.

The other options are not valid Git commands:

git cp and git copy: There are no Git commands for copying files directly. File copying is typically done using standard file system commands, and then using git add to track the new files.

git move: This is not a valid Git command; the correct command for moving or renaming files is git mv.

References:

Git Documentation - git rm

Git Documentation - git mv

In a Dockerfile, the ENTRYPOINT instruction is used to specify the command that will be executed when a container starts. Unlike CMD, which can be overridden by arguments provided in docker run, ENTRYPOINT ensures that the specified command is always run.

References:

Docker Documentation - ENTRYPOINT

A. Microservices architecture allows different services to be developed, deployed, and replaced independently, facilitating the replacement of specific functionalities without impacting the entire system.

D. Due to the network latency and overhead associated with inter-service communication, interaction between microservices can indeed be slower than the interaction of components within a monolithic application.

E. One of the significant advantages of microservices is the ability to update and redeploy individual services independently, which helps in faster iteration and deployment cycles.

References:

Microservices Architecture

Microservices vs Monolithic Architecture

An online shop that needs to store information about clients and orders with fixed properties and enforced data types, and ensure that each order is associated with an existing client, requires a relational database.

Relational Database: Relational databases, such as MariaDB, are designed to enforce data types and relationships between different entities (e.g., clients and orders). They can ensure referential integrity, which means an order must be associated with an existing client.

The other options are not suitable:

A. An in-memory database like memcached: In-memory databases do not provide the necessary persistence and relational features.

B. An object store like OpenStack Swift: Object stores are designed for unstructured data and do not enforce data types or relationships.

C. A messaging service like OpenStack Zaqar: Messaging services are for communication between services and not for persistent data storage.

D. A NoSQL database like MongoDB: While NoSQL databases can store data, they typically do not enforce strict data types and relationships as effectively as relational databases.

References:

MariaDB Documentation

Unit tests are designed to test the smallest parts of an application, called units. These are typically individual functions or methods within a software component. The primary goal of unit testing is to validate that each unit of the software performs as expected.

D. The correctness of a specific function of a software component: Unit tests focus on testing individual functions or methods to ensure they produce the correct results given various inputs.

The other options are incorrect:

A: Syntactical correctness is checked by the compiler or interpreter, not unit tests.

B: Formal validity of a service's external REST API is usually tested with integration or API tests.

C: Integration tests focus on the integration of multiple components.

E: Performance tests (throughput, load capacity, latency) are not part of unit testing.

References:

Wikipedia - Unit Testing

B. When a merge conflict occurs, Git inserts conflict markers into the files to indicate the conflicting sections.

D. The files with conflicts are marked as conflicted in the repository, and you need to manually resolve the conflicts before completing the merge.

References:

Git Documentation - Merge Conflicts

Resolving Merge Conflicts