Sent from my Galaxy Tab A (2016)-------- Original message --------From:
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To: [email protected] Subject: varnish-misc Digest, Vol 160, Issue
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digest..."Today's Topics: 1. Re: Environment variables in VCL (Bender,
Charles) 2. Re: Environment variables in VCL (Guillaume Quintard) 3. Re:
Environment variables in VCL (Poul-Henning Kamp) 4. Re: Environment variables
in VCL (Guillaume
Quintard)----------------------------------------------------------------------Message:
1Date: Tue, 10 Sep 2019 00:15:42 +0000From: "Bender, Charles"
<[email protected]>To: Hugues Alary <[email protected]>, varnish-misc
<[email protected]>Subject: Re: Environment variables in
VCLMessage-ID:
<[email protected]>Content-Type: text/plain;
charset="utf-8"Looking at a VCL I use to set hostname and this seems to
work-sub vcl_deliver { set resp.http.X-Cache-Node = server.hostname;}Maybe you
can use in form of server.environmental_variableFrom: varnish-misc
<[email protected]> on behalf of
Hugues Alary <[email protected]>Date: Monday, September 9, 2019 at 6:09
PMTo: varnish-misc <[email protected]>Subject: Environment
variables in VCLHi there,I'm using Varnish in a Kubernetes cluster and my
configuration needs to use environment variables.More specifically, I'm trying
to declare a `backend` with a `.host` whose value is an environment
variable.backend b0 { .host = "$ENVIRONMENT_VARIABLE_HOSTNAME"; .port = "80";
.connect_timeout = 300s; .first_byte_timeout = 300s; .between_bytes_timeout
= 300s;}This doesn't work. It tried using the std.get_env() function but it
doesn't work in this context.Is there any way to use environment variables in
VCL, or do I have to create a configuration template?Thanks for your
help,Cheers,-Hugues-------------- next part --------------An HTML attachment
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2Date: Tue, 10 Sep 2019 07:38:44 +0200From: Guillaume Quintard
<[email protected]>To: "Bender, Charles"
<[email protected]>Cc: Hugues Alary <[email protected]>, varnish-misc
<[email protected]>Subject: Re: Environment variables in
VCLMessage-ID:
<caj6zyqy5rnbjfcs88re6-hmfsqvyuzbokhoofq_c+suqnrq...@mail.gmail.com>Content-Type:
text/plain; charset="utf-8"Hi,The trouble is that the backends are C
structures created when you compilethe VCL, but std.getenv() is called when you
use the compile VCL, so thatway too late.I see two ways:- use a dynamic backend
vmod (like vmod_goto), allowing you to regularlyinterrogate DNS a build an
elastic director- create a static backend point to you k8s proxy, and just
setreq.http.host to whatever value you want.The last one is two of course
create a template, but remember that varnishresolves domain names in static
backend when it compiles the VCL, so theresolved IP may not be right all the
time.-- Guillaume QuintardOn Tue, Sep 10, 2019 at 2:17 AM Bender, Charles
<[email protected]>wrote:> Looking at a VCL I use to set hostname and
this seems to work->>>> sub vcl_deliver {>> set resp.http.X-Cache-Node =
server.hostname;>> }>>>> Maybe you can use in form of
server.environmental_variable>>>> *From: *varnish-misc
<varnish-misc-bounces+charles=> [email protected]> on behalf of
Hugues Alary <> [email protected]>> *Date: *Monday, September 9, 2019 at
6:09 PM> *To: *varnish-misc <[email protected]>> *Subject:
*Environment variables in VCL>>>> Hi there,>>>> I'm using Varnish in a
Kubernetes cluster and my configuration needs to> use environment
variables.>>>> More specifically, I'm trying to declare a `backend` with a
`.host` whose> value is an environment variable.>>> backend b0 {> .host =
"*$ENVIRONMENT_VARIABLE_HOSTNAME*";> .port = "80";> .connect_timeout =
300s;> .first_byte_timeout = 300s;> .between_bytes_timeout = 300s;>> }>>>>
This doesn't work. It tried using the std.get_env() function but it> doesn't
work in this context.>>>> *Is there any way to use environment variables in
VCL, or do I have to> create a configuration template?*>>>> Thanks for your
help,>>>> Cheers,>> -Hugues>>> _______________________________________________>
varnish-misc mailing list> [email protected]>
https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc>--------------
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3Date: Tue, 10 Sep 2019 06:44:45 +0000From: "Poul-Henning Kamp"
<[email protected]>To: Guillaume Quintard <[email protected]>Cc:
"Bender, Charles" <[email protected]>, varnish-misc
<[email protected]>Subject: Re: Environment variables in
VCLMessage-ID: <[email protected]>Content-Type: text/plain;
charset="us-ascii"--------In message
<caj6zyqy5rnbjfcs88re6-hmfsqvyuzbokhoofq_c+suqnrq...@mail.gmail.com>, Guillaume
Quintard writes:>I see two ways:There is a third way:You can use: include
"somefile"anywhere and everywhere in a VCL program.Before you start your
varnishd, do this in a shell script: echo
"\"$ENVIRONMENT_VARIABLE_HOSTNAME\"" > /somewhere/hostname.vclThen in VCL:
backend b0 { .host = include "/somewhere/hostname.vcl" ;
.port 80 ...-- Poul-Henning Kamp | UNIX since Zilog Zeus
[email protected] | TCP/IP since RFC 956FreeBSD committer | BSD
since 4.3-tahoe Never attribute to malice what can adequately be explained
by incompetence.------------------------------Message: 4Date: Tue, 10 Sep 2019
08:52:53 +0200From: Guillaume Quintard <[email protected]>To:
Poul-Henning Kamp <[email protected]>Cc: "Bender, Charles"
<[email protected]>, varnish-misc
<[email protected]>Subject: Re: Environment variables in
VCLMessage-ID:
<caj6zyqzhdbagqwzvmbdbs7uos+sy+0bnucyajn3fvpxbqkf...@mail.gmail.com>Content-Type:
text/plain; charset="utf-8"True, but that amounts to template processing :-)--
Guillaume QuintardOn Tue, Sep 10, 2019 at 8:44 AM Poul-Henning Kamp
<[email protected]>wrote:> --------> In message <>
caj6zyqy5rnbjfcs88re6-hmfsqvyuzbokhoofq_c+suqnrq...@mail.gmail.com>> ,
Guillaume Quintard writes:>> >I see two ways:>> There is a third way:>> You can
use:>> include "somefile">> anywhere and everywhere in a VCL program.>>
Before you start your varnishd, do this in a shell script:>> echo
"\"$ENVIRONMENT_VARIABLE_HOSTNAME\"" > /somewhere/hostname.vcl>> Then in VCL:>>
backend b0 {> .host = include "/somewhere/hostname.vcl"
;> .port 80> ...>>>> --> Poul-Henning Kamp
| UNIX since Zilog Zeus 3.20> [email protected] | TCP/IP since RFC 956>
FreeBSD committer | BSD since 4.3-tahoe> Never attribute to malice what
can adequately be explained by incompetence.>-------------- next part
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