Consul 1.15 Health Checking Practice Test 2 — 15 Questions

Question 1

What is the purpose of the 'check' field inside a 'service' object in a Consul configuration file?

Accepted Answer

To define the health status requirements. The 'check' field is used to define health checks specifically associated with the service instance, ensuring the service is marked critical if the check fails.

Answer

To provide credentials for the service

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To enable service discovery

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To set the service weight

Question 2

When a health check is failing, which Consul API endpoint would you call to investigate the specific error message provided by the check?

Accepted Answer

/v1/health/checks/. The '/v1/health/checks/' endpoint provides detailed information about the status and output of checks for a given service.

Answer

/v1/agent/services

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/v1/agent/self

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/v1/catalog/nodes

Question 3

Which of the following is a valid method to update a TTL health check?

Accepted Answer

HTTP PUT to the /agent/check/pass endpoint. The agent exposes an HTTP API endpoint to update the status of a TTL check manually.

Answer

Using the 'consul kv' update

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Consul CLI 'health' command

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Editing the service definition file

Question 4

In a Consul health check, what does the 'notes' field provide?

Accepted Answer

A human-readable description. The 'notes' field allows operators to add human-readable descriptions of what the health check monitors.

Answer

The trigger time

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The expected result

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The logic for the check

Question 5

You want to run a shell command as a health check. Which field in the service definition specifies the command to execute?

Accepted Answer

script. The 'args' or 'script' field is used to define the command the Consul agent executes to perform a script check.

Answer

check_exec

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command

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action

Question 6

What is the primary difference between a 'script' check and an 'http' check in terms of how they are processed by the Consul agent?

Accepted Answer

Script checks require executing a local process. Script checks run an external binary or shell script on the host, while HTTP checks involve the agent making a network request to the service.

Answer

HTTP checks are more secure

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Only HTTP checks support intervals

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Script checks are faster

Question 7

What happens if you do not specify an 'interval' for a health check in the configuration?

Accepted Answer

The configuration will fail to load. The 'interval' is a required field for periodic health checks; the agent will fail to load the configuration without it.

Answer

It inherits the agent's check interval

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It defaults to 10 seconds

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It runs once and stops

Question 8

If a service has multiple health checks associated with it, when is the service itself considered 'critical'?

Accepted Answer

When any check is critical. Consul considers a service critical if any of its associated health checks are in a critical state.

Answer

When a majority of checks are critical

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When all checks are critical

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Only if the primary check is critical

Question 9

When using the HTTP health check type, how can you verify that a specific header is included in the health check request?

Accepted Answer

By adding the 'header' object to the check definition. The 'header' field within the HTTP check configuration allows specifying custom HTTP headers for the check request.

Answer

By appending it to the URL string

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It is not possible

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By setting the environment variable

Question 10

You are troubleshooting a health check that seems to be hanging. Which flag, if available, would provide more information about the check's execution within the agent logs?

Accepted Answer

-log-level=debug. Increasing the agent's log level to 'debug' provides detailed information about check execution and processing.

Answer

-verbose

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-monitor-checks

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-trace

Question 11

Which of the following are valid types of health checks in Consul? (Select TWO)

Accepted Answer

TCP. Consul natively supports HTTP, TCP, Script, and TTL checks.

Answer

ICMP

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UDP

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SNMP

Question 12

If you need to perform an HTTP check over HTTPS, what configuration option is required to handle self-signed certificates?

Accepted Answer

tls_skip_verify. The 'tls_skip_verify' parameter allows the agent to skip verification of the service's TLS certificate.

Answer

tls_insecure

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disable_tls

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ignore_cert

Question 13

What is the consequence of having a service with no health checks registered?

Accepted Answer

The service status is 'passing'. If no health checks are provided, the service is assumed to be healthy by default as long as the service is registered in the catalog.

Answer

The agent will error out

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The service is ignored by DNS

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The service is critical

Question 14

What information does the Consul HTTP API return for a health check? (Select TWO)

Accepted Answer

Output. The API returns the status and the human-readable output of the check.

Answer

Service CPU usage

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Service port

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Check uptime

Question 15

Which feature allows you to define a health check that depends on the health of another service?

Accepted Answer

You must implement this logic in a script check. Consul does not support direct service-to-service health check dependencies; instead, you would implement this logic within your application or use a custom script.

Answer

Service dependency field

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Cross-service monitoring

Answer

Service grouping