Amazon Amazon Certifications DOP-C02 Questions & Answers

• Question 371:

  When specifying more than one conditional requirements for a task, what is the proper method?

  A. - when: foo == "hello" and bar == "world"

  B. - when: foo == "hello" - when: bar == "world"

  C. - when: foo == "hello" andand bar == "world"

  D. - when: foo is "hello" and bar is "world"

  Correct Answer: A

  Ansible will allow you to stack conditionals using `and' and `or'. It requires it to be in the same `when' statement, comparisons must be `==' for equals or `!=' for not equals and the `and/or' must be written as such, not `andand/||'.

  Reference: http://docs.ansible.com/ansible/playbooks_conditionals.html#the-when-statement

• Question 372:

  Ansible supports running Playbook on the host directly or via SSH. How can Ansible be told to run its playbooks directly on the host?

  A. Setting `connection: local' in the tasks that run locally.

  B. Specifying `-type local' on the command line.

  C. It does not need to be specified; it is the default.

  D. Setting `connection: local' in the Playbook.

  Correct Answer: D

  Ansible can be told to run locally on the command line with the `-c' option or can be told via the `connection: local' declaration in the playbook. The default connection method is `remote'.

  Reference: http://docs.ansible.com/ansible/intro_inventory.html#non-ssh-connection-types

• Question 373:

  When writing custom Ansible modules, which language is not supported?

  A. Python

  B. C++

  C. Bash

  D. All of the languages listed are supported

  Correct Answer: D

  Ansible modules can be written in any language that is executable on the target system. The only requirement is that the module can write its results as JSON output to STDOUT for Ansible to consume.

  Reference: http://docs.ansible.com/ansible/developing_modules.html

• Question 374:

  What is the expected behavior if Ansible is called with `ansible-playbook -i localhost playbook.yml'?

  A. Ansible will attempt to read the inventory file named `localhost'

  B. Ansible will run the plays locally.

  C. Ansible will run the playbook on the host named `localhost'

  D. Ansible won't run, this is invalid command line syntax

  Correct Answer: A

  Ansible expects an inventory filename with the `-i' option, regardless if it is a valid hostname. For this to execute on the host `localhost' resolves to, a comma needs to be appended to the end.

  Reference: http://docs.ansible.com/ansible/intro_inventory.html#inventory

• Question 375:

  The Ansible Inventory system allows many attributes to be defined within it. Which item below is not one of these?

  A. Group variables

  B. Host groups

  C. Include vars

  D. Children groups

  Correct Answer: C

  Ansible inventory files cannot reference other files for additional data. If this functionality is needed, it must be done in as a script to create a dynamic inventory.

  Reference: http://docs.ansible.com/ansible/intro_inventory.html

• Question 376:

  If Ansible encounters a resource that does not meet the requirements specified in the play it makes the necessary changes to the resource; however if the resource is already in the desired state Ansible will do nothing. This is an example of which methodology?

  A. Idempotency

  B. Immutability

  C. Convergence

  D. Infrastructure as Code

  Correct Answer: A

  Idempotency states that changes are only made if a resource does not meet the requirement specifications. If a change is made, it is made `in-place' and will not break existing resources.

  Reference: http://docs.ansible.com/ansible/glossary.html

• Question 377:

  When writing plays, tasks and playbooks, Ansible fully supports which high level language to describe these?

  A. YAML

  B. Python

  C. XML

  D. JSON

  Correct Answer: A

  This can be bit of a trick question. While Ansible Playbooks in this course are written in YAML, Ansible will accept plays, tasks and playbooks in JSON, as JSON a subset of YAML. However, the preferred and fully supported method is YAML.

  Reference: http://docs.ansible.com/ansible/YAMLSyntax.html

• Question 378:

  You have a playbook that includes a task to install a package for a service, put a configuration file for that package on the system and restart the service. The playbook is then run twice in a row. What would you expect Ansible to do on the second run?

  A. Remove the old package and config file and reinstall and then restart the service.

  B. Take no action on the target host.

  C. Check if the package is installed, check if the file matches the source file, if not reinstall it; restart the service.

  D. Attempt to reinstall the package, copy the file and restart the service.

  Correct Answer: C

  Ansible follows an idempotence model and will not touch or change the system unless a change is warranted.

  Reference: http://docs.ansible.com/ansible/glossary.html

• Question 379:

  Which tool will Ansible not use, even if available, to gather facts?

  A. facter

  B. lsb_release

  C. Ansible setup module

  D. ohai

  Correct Answer: B

  Ansible will use its own `setup' module to gather facts for the local system. Additionally, if ohai or facter are installed, those will also be used and all variables will be prefixed with `ohai_' or `facter_' respectively. `lsb_relase' is a Linux tool for determining distribution information.

  Reference: http://docs.ansible.com/ansible/setup_module.html

• Question 380:

  If a variable is assigned in the `vars' section of a playbook, where is the proper place to override that variable?

  A. Inventory group var

  B. playbook host_vars

  C. role defaults

  D. extra vars

  Correct Answer: D

  In Ansible's variable precedence, the highest precedence is the extra vars option on the command line.

  Reference: http://docs.ansible.com/ansible/playbooks_variables.html#variable-precedence-where-should-iput-a-variable