j7ourenz opened a new issue, #9794:
URL: https://github.com/apache/apisix/issues/9794
### Description
### Setup:
apisix.yaml
```
routes:
- id: backend
uri: /*
upstream:
nodes:
"backend.example.internal:8888": 1
type: chash
# key: remote_addr # default
plugin_config_id: 1
# alternate config:
# type: chash
# hash_on: header
# key: x-forwarded-for
plugin_configs:
- id: 1
plugins:
real-ip:
source: http_x_forwarded_for
trusted_addesses:
- ${{VPC_CIDR}}
```
```
nslookup backend.example.internal
Address: 10.0.0.10
Address: 10.0.0.20
Address: 10.0.0.30
```
### Expected Behaviour:
Client will end up on the same backend server (sticky session).
```
Sample logs:
$remote_addr - \"$request\ - \"$http_x_forwarded_for\" - \"$upstream_addr\"
<client's ip> - "GET" - <client's ip> - "10.0.0.10:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.10:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.10:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.10:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.10:8888"
```
### Actual Behaviour:
Client end up in random backend.
```
sample logs:
$remote_addr - \"$request\ - \"$http_x_forwarded_for\" - \"$upstream_addr\"
<client's ip> - "GET" - <client's ip> - "10.0.0.10:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.10:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.20:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.30:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.20:8888"
<client's ip> - "GET" - <client's ip> - "10.0.0.10:8888"
```
### Additional Information:
This is the nginx config I'm trying to achieve/replicate which is working
minus the resolver in upstream.
```
upstream backend {
ip_hash;
server backend.example.internal:8888;
keepalive 16;
}
server {
set_real_ip_from ${{VPC_CIDR}};
real_ip_header X-Forwarded-For;
location / {
proxy_pass http://backend;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_set_header X-Forwarded-Proto
$http_x_forwarded_proto;
proxy_next_upstream error timeout http_502 http_503
http_504;
}
}
```
For each request, resolver.lua returns one (random) IP of the domain.
```
resolver.lua:88: parse_domain(): dns resolver domain:
backend.example.internal to 10.0.0.10
resolver.lua:88: parse_domain(): dns resolver domain:
backend.example.internal to 10.0.0.10
resolver.lua:88: parse_domain(): dns resolver domain:
backend.example.internal to 10.0.0.20
resolver.lua:88: parse_domain(): dns resolver domain:
backend.example.internal to 10.0.0.30
resolver.lua:88: parse_domain(): dns resolver domain:
backend.example.internal to 10.0.0.20
resolver.lua:88: parse_domain(): dns resolver domain:
backend.example.internal to 10.0.0.10
```
Am I missing something here or what I'm trying to achieve is not possible?
Thanks!
### Environment
- APISIX version (run `apisix version`): 3.2.1
- Operating system (run `uname -a`): Amazon Linux 2
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
openresty/1.21.4.1
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`):
- APISIX Dashboard version, if relevant:
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):
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