<div><div><div><div dir="auto">@Hugues</div></div><div dir="auto"><br></div><div dir="auto">I am also a heavy user in kube/openshift environments and this issue is addressed by means of templating. </div><div dir="auto"><br></div><div dir="auto">Using tools like helm would easily solve this for you. Helm has the value and it uses it when rendering the backends file - in the form of a configmap perhaps.</div><div dir="auto"><br></div><div dir="auto">If you can’t/don’t want to use helm, you can still “render” configuration by consuming values from the ENV by using envsubst for example. This is how we dis it before helm. Burn the backends.vcl file AT RUNTIME by passing the backends.vcl file through envsubst. </div></div><div dir="auto"><br></div><div dir="auto">Either way, my recommendation is to solve this through templating and not by trying to access ENV directly from the the backends VCL. I’m saying this having a proper SDLC in mind. </div><div dir="auto"><br></div><div dir="auto">Of course, dynamic backends and all other options Guillaume and Paul-Henning have mentioned are solid. </div></div><div dir="auto"><br></div><div dir="auto">Vlad Rusu</div><div><div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 10 Sep 2019 at 22:14, Hugues Alary <<a href="mailto:hugues@betabrand.com" target="_blank">hugues@betabrand.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Guillaume, Poul-Henning, thank you for your suggestions.</div><div><br></div><div>Regarding,<br></div><div>> - create a static backend point to you k8s proxy, and just set req.http.host to whatever value you want.</div><div><br></div><div>I don't think this would work for me since I'm working with a backend definition, trying to change the IP address (/hostname) to which the backend points to and not simply trying to change the Host header of the request.</div><div><br></div><div>Cheers,</div><div>-Hugues<br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Sep 9, 2019 at 11:54 PM Guillaume Quintard <<a href="mailto:guillaume@varnish-software.com" target="_blank">guillaume@varnish-software.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">True, but that amounts to template processing :-)<div><br clear="all"><div><div dir="ltr" class="m_2176665673368847089m_-3294297240461259343m_2323416456584194390gmail-m_1901881666240893625gmail_signature"><div dir="ltr"><div>-- <br></div>Guillaume Quintard<br></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Sep 10, 2019 at 8:44 AM Poul-Henning Kamp <<a href="mailto:phk@phk.freebsd.dk" target="_blank">phk@phk.freebsd.dk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">--------<br>
In message <<a href="mailto:CAJ6ZYQy5RnBjfCs88re6-hMfsQvyuzbOkHoofQ_c%2BsuQNRQjig@mail.gmail.com" target="_blank">CAJ6ZYQy5RnBjfCs88re6-hMfsQvyuzbOkHoofQ_c+suQNRQjig@mail.gmail.com</a>><br>
, Guillaume Quintard writes:<br>
<br>
>I see two ways:<br>
<br>
There is a third way:<br>
<br>
You can use:<br>
<br>
include "somefile"<br>
<br>
anywhere and everywhere in a VCL program.<br>
<br>
Before you start your varnishd, do this in a shell script:<br>
<br>
echo "\"$ENVIRONMENT_VARIABLE_HOSTNAME\"" > /somewhere/hostname.vcl<br>
<br>
Then in VCL:<br>
<br>
backend b0 {<br>
.host = include "/somewhere/hostname.vcl" ;<br>
.port 80<br>
...<br>
<br>
<br>
<br>
-- <br>
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20<br>
phk@FreeBSD.ORG | TCP/IP since RFC 956<br>
FreeBSD committer | BSD since 4.3-tahoe <br>
Never attribute to malice what can adequately be explained by incompetence.<br>
</blockquote></div>
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</div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">Sent from my iPhone</div>