Health check with GUI enabled on MaxScale 2.5

[art...@gmail.com]

Hi,

Would it be realistic to ever be able to use the commandline health-check option in MaxScale 2.5 with the GUI enabled? I don't want to loose a beautiful GUI, but at the same time check it is desperately needed to perform HA.

br,

Arthur

[Markus Mäkelä]

Hi,

What do you mean by the command line health-check option? If you're talking about MaxCtrl, it works the same way even if the GUI is enabled. If you're talking about the HTTP 200 response that's sent when the root resource is requested, the functionality should still be the same but only the contents differ.

Markus

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[art...@gmail.com]

Hi,

Thank you for your response.

Some clarifications. Yes, I've analyse HTTP 200 OK. With previous versions of MaxScale (up to 2.4.13) I have set listener on port 6444:

[MaxInfo-JSON-Listener]

type=listener

service=MaxInfo

protocol=HTTPD

port=6444

and do health-check by command:

http://localhost:6444

and got a compact answer like:

curl  -i http://localhost:6444

HTTP/1.1 200 OK

Date: Wed, 28 Oct 2020 21:47:54 GMT

Server: MaxScale(c) v.1.0.0

Connection: close

WWW-Authenticate: Basic realm="MaxInfo"

Content-Type: application/json

The closest analogue for this  with version 2.5 and GUI enabled I found with this query:

http://localhost:8989/v1/monitors

Yes, it indeed return HTTP 200 OK as well, but with big body (json data) (Content-Length: 5095).

May be there exists any other URL that will give me HTTP 200, but without or with smaller body?

br,

Arthur

[Markus Mäkelä]

Hi,

You could use `http://localhost:8989/maxscale/threads/0?pretty=false`. This will always work and it'll return around 500 bytes of data in the payload which is an improvement over the 5000 bytes of the `monitors` endpoint.

With the addition of the MaxScale GUI, there's really no resources that would return the minimal payload. We could add a health check endpoint that would return a 200 OK without a body. If you can, please open an issue about this on the MariaDB Jira under the MaxScale project and describe the issue you're facing.

Markus

To view this discussion on the web, visit https://groups.google.com/d/msgid/maxscale/6c7d52a3-c730-4e3b-8eae-b0425bdb4211n%40googlegroups.com.