No resolv domen in internal

[kocik799]

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Description

Hi. I ran into the problem that I can't connect keycloak. I found out that the php-fpm-gmail com container resolves the domain sso.domen.ru to an external address, not an internal one. The host has internal local dns servers (192.168.55.12 192.168.51.25). The unbound-mail cow container resolves correctly to local 192.168.55.11 (sso.domen.ru )

My host /etc/resolv.conf 
# Generated by NetworkManager
nameserver 192.168.55.12
nameserver 192.168.51.25

how can I fix this behavior, why resolves to external and not to local?

Logs:

-

Steps to reproduce:

docker exec -it d9331449c705 sh (mailcowdockerized-php-fpm-mailcow-1)
; <<>> DiG 9.18.36 <<>> sso.*domen*.ru.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48002
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;sso.*domen*.ru.               IN      A

;; ANSWER SECTION:
sso.*domen*.ru.        167     IN      A       178.234.111.252

;; Query time: 3 msec
;; SERVER: 127.0.0.11#53(127.0.0.11) (UDP)
;; WHEN: Fri May 09 20:55:57 MSK 2025
;; MSG SIZE  rcvd: 60

sudo docker exec -it a9f1e58f84ce sh (mailcowdockerized-unbound-mailcow-1)
; <<>> DiG 9.18.34 <<>> sso.*domen*.ru.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31773
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;sso.*domen*.ru.               IN      A

;; ANSWER SECTION:
sso.*domen*.ru.        60      IN      A       192.168.55.11

;; Query time: 3 msec
;; SERVER: 127.0.0.11#53(127.0.0.11) (UDP)
;; WHEN: Fri May 09 20:54:22 MSK 2025
;; MSG SIZE  rcvd: 60

Which branch are you using?

master

Which architecture are you using?

x86

Operating System:

oracle linux 8

Server/VM specifications:

8g ram 8 cpu

Is Apparmor, SELinux or similar active?

no

Virtualization technology:

VMWare

Docker version:

26.1.3

docker-compose version or docker compose version:

mailcow version:

2025-03b

Reverse proxy:

Haproxy

Logs of git diff:

-

Logs of iptables -L -vn:

-

Logs of ip6tables -L -vn:

-

Logs of iptables -L -vn -t nat:

-

Logs of ip6tables -L -vn -t nat:

-

DNS check:

docker exec -it $(docker ps -qf name=mailcowdockerized-php-fpm-mailcow-1) dig +short sso.domen.ru @172.22.1.254
178.234.111.1 - external ip