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README.md

DNS queries in Camel K examples

Contains examples on how to perform DNS queries in a Camel K integration.

You can find more information about Apache Camel and Apache Camel K on the official Camel website.

Before you begin

Read the general instructions in the root README.md file for setting up your environment and the Kubernetes cluster before looking at this example.

Make sure you've read the installation instructions for your specific cluster before starting the example.

Understanding the Examples

  • ip.js: defines a route that every second, uses a message header to query DNS for an IP address and logs the result.
  • lookup.js: defines a route that every 10 seconds, uses message headers to lookup the MX records associated with a domain name, processes the response and logs it.

To learn about more options for configuring DNS queries, see here

Running the Examples

Run the ip.js integration:

kamel run --dev ip.js

You should see the IP address logged to the terminal every second:

...
[1] 2022-07-05 09:10:29,983 INFO  [dns] (Camel (camel-1) thread #1 - timer://dns) Exchange[ExchangePattern: InOnly, BodyType: java.net.Inet4Address, Body: 142.251.36.36]
[1] 2022-07-05 09:10:30,984 INFO  [dns] (Camel (camel-1) thread #1 - timer://dns) Exchange[ExchangePattern: InOnly, BodyType: java.net.Inet4Address, Body: 142.251.36.36]

Run the lookup.js integration:

kamel run --dev lookup.js

Every 10 seconds, You should see the MX records associated with the specified domain being logged to the terminal. Each MX record should have a Target value, a Priority value for the target, and a TTL value:

...
[1] 2022-07-05 09:14:27,803 INFO  [mxrecord] (Camel (camel-1) thread #1 - timer://dns) Target: gmail-smtp-in.l.google.com., Priority: 5, TTL: 30
[1] 2022-07-05 09:14:27,821 INFO  [mxrecord] (Camel (camel-1) thread #1 - timer://dns) Target: alt2.gmail-smtp-in.l.google.com., Priority: 20, TTL: 30
[1] 2022-07-05 09:14:27,829 INFO  [mxrecord] (Camel (camel-1) thread #1 - timer://dns) Target: alt4.gmail-smtp-in.l.google.com., Priority: 40, TTL: 30
[1] 2022-07-05 09:14:27,833 INFO  [mxrecord] (Camel (camel-1) thread #1 - timer://dns) Target: alt3.gmail-smtp-in.l.google.com., Priority: 30, TTL: 30
[1] 2022-07-05 09:14:27,858 INFO  [mxrecord] (Camel (camel-1) thread #1 - timer://dns) Target: alt1.gmail-smtp-in.l.google.com., Priority: 10, TTL: 30