markokocic commented on issue #10509:
URL: https://github.com/apache/apisix/issues/10509#issuecomment-1820482197
hi @kayx23
I just tested again before updating the docs, and it looks that environment
variable substitution is indeed not supported in standalone `apisix.yaml`
I craeted the following route:
```yaml
- uri: /b92/*
upstream:
nodes:
"${{EP_MYHOST_1:=}}:443": 1
type: roundrobin
scheme: https
```
and configured EP_MYHOST_1 environment variable in docker compose file by
adding:
```yaml
environment:
- EP_MYHOST_1=b92.net
```
I then started the container and logged in to the running container to
confirm:
```shell
apisix@e9512d0cfdaa:/usr/local/apisix$ echo $EP_MYHOST_1
b92.net
```
However, when I try to access the route, I get the following response:
```shell
C:\Users\Marko.Kocic>curl http://localhost:9080/b92/
<html>
<head><title>503 Service Temporarily Unavailable</title></head>
<body>
<center><h1>503 Service Temporarily Unavailable</h1></center>
<hr><center>openresty</center>
<p><em>Powered by <a
href="https://apisix.apache.org/";>APISIX</a>.</em></p></body>
</html>
```
Apisix logs also shows the same error:
```
2023/11/21 08:39:25 [error] 38#38: *6194 [lua] upstream.lua:79:
parse_domain_for_nodes(): dns resolver domain: ${{EP_MYHOST_1:=}}:443 error:
failed to query the DNS server: dns server error: 3 name error, client:
10.89.0.7, server: _, request: "GET /b92/ HTTP/1.1", host: "localhost:9080"
2023/11/21 08:39:25 [error] 38#38: *6194 [lua] resolver.lua:80:
parse_domain(): failed to parse domain: , error: failed to query the DNS
server: dns server error: 3 name error, client: 10.89.0.7, server: _, request:
"GET /b92/ HTTP/1.1", host: "localhost:9080"
2023/11/21 08:39:25 [error] 38#38: *6194 [lua] upstream.lua:79:
parse_domain_for_nodes(): dns resolver domain: error: failed to query the DNS
server: dns server error: 3 name error, client: 10.89.0.7, server: _, request:
"GET /b92/ HTTP/1.1", host: "localhost:9080"
2023/11/21 08:39:25 [error] 38#38: *6194 [lua] init.lua:551:
handle_upstream(): failed to set upstream: no valid upstream node, client:
10.89.0.7, server: _, request: "GET /b92/ HTTP/1.1", host: "localhost:9080"
10.89.0.7 - - [21/Nov/2023:08:39:25 +0000] localhost:9080 "GET /b92/
HTTP/1.1" 503 269 0.522 "-" "curl/8.4.0" - - - "http://localhost:9080";
```
However, when I update apisix.yml file to use host name instead of a
variable, everything works ok.
At this point, I tend to believe that the documentation is correct that it
doesn't mention apisix.yml supporting environment variable substitution. Maybe
it should be explicit about not supporting, since initially, I also wrongly
believed that it should support it.
Or a feat ticket should be created to enable this support in apisix.yml.
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