Just been doing some tests and finding using this plugin is causing seg
faults when the client requests a uri of / or null. I guess that is why
its still experimental.
I have not done much coding for a while but in health_check_origin after :
const char* path = TSUrlPathGet(reqp, url_loc, &path_len);
I added :
if (!path)
goto cleanup;
On Sat, Sep 7, 2013 at 12:35 AM, Williamson, Brad <
[email protected]> wrote:
> We use this on the BigIP's as a lightweight healthcheck:
> Send String: GET /__HC__ \r\n\r\n
> Receive String: abcdefghijklmnopqrstuvwxyz
>
> Which uses this in the remap.config, complete with extra paranoia:
> map http://myservername01.domain.com/__HC__
> http://myservername01.domain.com:8083/synthetic.txt
> map http://myservername01/__HC__
> http://myservername01.domain.com:8083/synthetic.txt
> map /__HC__ http://myservername01.domain.com:8083/synthetic.txt
>
>
> We have a few layers of health checks that check end-to-end operation of
> the ATS boxes:
> - Check a piece of non-cachable media from external site
> - Check a piece of cachable media from external site
> - TCP Port monitors from internal
> - /__HC__ healthchecks from all places that need connectivity
> - different pieces of media that are obtained through different remap rules
> - composite monitors that fire when 3 out of 5 pieces of media are not
> status 200's
>
> I'll have to look at the plugin and see if it adds anything that we don't
> already have. The synthetic is nice in that it is very quick to respond to
> a failure, but we once it is up, we try to test on what it is really
> supposed to be doing (i.e. delivering media!). And, BTW, the ATS boxes have
> been extremely reliable (knocks on wood) and extremely fast.
>
> Brad
>
>
>
> -----Original Message-----
> From: Leif Hedstrom [mailto:[email protected]]
> Sent: Thursday, September 05, 2013 7:23 PM
> To: [email protected]; Scott Harris
> Subject: Re: Health Check Url from Loadbalancer
>
> On Sep 5, 2013, at 5:15 PM, Scott Harris <[email protected]> wrote:
>
> > I have a multi node cluster with a F5 Loadbalancer providing a vip and
> balancing requests across the cluster, as part of the F5 config a
> healthcheck is required to validate each node is alive and ready to take
> requests.
> >
> > Is there any light weight healthcheck urls ats provides for this?
> >
> > I found an internal url test url using a remap mappping to http://{test}
> but the response is about 63KB.
>
> There's a plugin in experimental, that's intended for this purpose. It'll
> watch a file (or files) on your file system, and return the content of that
> upon request. The idea is that if you remove that file, the plugin will
> return e.g. a 404 (configurable), telling the load balancer to take the box
> out of rotation.
>
> This allows you to check both the health of the server, and manage its
> participation in the rotation.
>
> -- Leif
>
> E.g.
>
> loki (15:53) 580/1 $ cat plugins/experimental/healthchecks/README
> This is a simple plugin, to provide basic (but configurable) health checks.
> This is a server intercept plugin, and it takes one single configuration
> option in plugin.config, the configuration file name.
>
> This configuration contains one, or several, lines of the format
>
> <URI-path> <file-path> <mime> <file-exists-code> <file-missing-code>
>
>
> For example,
>
> /__hc /var/run/ts-alive text/plain 200 403
>
>
> The content of the file, if any, is sent as the body of the response.
>
>
