mailcow 2024-07 is running on:
Proxmox Virtual Environment 8.1.4
1 socket 4 cpu, 16 GB RAM, x86-64-v2-AES

cat /etc/debian_version –> 12.6

cat /etc/apt/sources.list

deb http://ftp-stud.hs-esslingen.de/debian/ bookworm main non-free-firmware
deb-src http://ftp-stud.hs-esslingen.de/debian/ bookworm main non-free-firmware

deb http://security.debian.org/debian-security bookworm-security main non-free-firmware
deb-src http://security.debian.org/debian-security bookworm-security main non-free-firmware

deb http://ftp-stud.hs-esslingen.de/debian/ bookworm-updates main non-free-firmware
deb-src http://ftp-stud.hs-esslingen.de/debian/ bookworm-updates main non-free-firmware

cat sources.list.d/docker.list
deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian bookworm stable

apt update
OK:1 http://ftp-stud.hs-esslingen.de/debian bookworm InRelease
Holen:2 https://download.docker.com/linux/debian bookworm InRelease [43,3 kB]
Holen:3 http://ftp-stud.hs-esslingen.de/debian bookworm-updates InRelease [55,4 kB]
Holen:4 http://security.debian.org/debian-security bookworm-security InRelease [48,0 kB]
Es wurden 147 kB in 2 s geholt (95,8 kB/s).
Paketlisten werden gelesen… Fertig
Abhängigkeitsbaum wird aufgebaut… Fertig
Statusinformationen werden eingelesen… Fertig
Alle Pakete sind aktuell.

docker version
Client: Docker Engine - Community
Version: 27.1.2
API version: 1.46
Go version: go1.21.13
Git commit: d01f264
Built: Mon Aug 12 11:50:58 2024
OS/Arch: linux/amd64
Context: default

Server: Docker Engine - Community
Engine:
Version: 27.1.2
API version: 1.46 (minimum version 1.24)
Go version: go1.21.13
Git commit: f9522e5
Built: Mon Aug 12 11:50:58 2024
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.7.20
GitCommit: 8fc6bcff51318944179630522a095cc9dbf9f353
runc:
Version: 1.1.13
GitCommit: v1.1.13-0-g58aa920
docker-init:
Version: 0.19.0
GitCommit: de40ad0

docker compose version
Docker Compose version v2.29.1

docker compose exec unbound-mailcow /bin/bash
./healthcheck.sh
2024-08-17 16:16:47: Starting health check - logs can be found in /var/log/healthcheck.log
PING 1.1.1.1 (1.1.1.1): 56 data bytes

— 1.1.1.1 ping statistics —
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 21.755/26.958/34.800 ms
PING 8.8.8.8 (8.8.8.8): 56 data bytes

— 8.8.8.8 ping statistics —
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 21.730/25.025/31.548 ms
PING 9.9.9.9 (9.9.9.9): 56 data bytes

— 9.9.9.9 ping statistics —
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 26.463/29.066/34.093 ms

mailcow is working flawlessly.

Performing the update 2024-08 leads to an unbound error while # docker compose up -d. Container is not starting. Attaching to the unbound container the healthcheck is giving only errors.

Nothing has been changed in the environment.

What’s wrong? Any help is appreciated. I restored a backup, so no need to hurry…

More info while beeing attached to the unbound container:

./healthcheck.sh
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 1 for fuzzy.mailcow.email! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 2 for fuzzy.mailcow.email! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 3 for fuzzy.mailcow.email! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution not possible after 3 attempts for fuzzy.mailcow.email… Gave up!
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 1 for github.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 2 for github.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 3 for github.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution not possible after 3 attempts for github.com… Gave up!
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 1 for hub.docker.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 2 for hub.docker.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 3 for hub.docker.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution not possible after 3 attempts for hub.docker.com… Gave up!
2024-08-17 16:37:58: Healthcheck: Too many DNS failures (1 failures allowed, you got 3 failures), marking Healthcheck as unhealthy…

ping -c1 1.1.1.1
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=53 time=29.332 ms

— 1.1.1.1 ping statistics —
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 29.332/29.332/29.332 ms
ping -c1 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=54 time=28.553 ms

— 8.8.8.8 ping statistics —
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 28.553/28.553/28.553 ms
ping -c1 9.9.9.9
PING 9.9.9.9 (9.9.9.9): 56 data bytes
64 bytes from 9.9.9.9: seq=0 ttl=54 time=35.367 ms

— 9.9.9.9 ping statistics —
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 35.367/35.367/35.367 ms

dig +short fuzzy.mailcow.email
95.217.129.125

dig +short github.com
140.82.121.4

dig +short hub.docker.com
elb-default.us-east-1.aws.dckr.io.
prodextdefgreen-k0uuibjyui-4ec6503f7037d339.elb.us-east-1.amazonaws.com.
44.219.3.189
3.224.227.198
44.193.181.103

More info while beeing attached to the unbound container:

ping -c1 1.1.1.1
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=53 time=29.332 ms

— 9.9.9.9 ping statistics —
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 35.367/35.367/35.367 ms

dig +short fuzzy.mailcow.email
95.217.129.125

dig +short github.com
140.82.121.4

dig +short hub.docker.com
elb-default.us-east-1.aws.dckr.io.
prodextdefgreen-k0uuibjyui-4ec6503f7037d339.elb.us-east-1.amazonaws.com.
44.219.3.189
3.224.227.198
44.193.181.103

More info while beeing attached to the unbound container:

healthcheck.sh
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 1 for fuzzy.mailcow.email! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 2 for fuzzy.mailcow.email! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 3 for fuzzy.mailcow.email! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution not possible after 3 attempts for fuzzy.mailcow.email… Gave up!
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 1 for github.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 2 for github.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 3 for github.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution not possible after 3 attempts for github.com… Gave up!
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 1 for hub.docker.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 2 for hub.docker.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution Failed on attempt 3 for hub.docker.com! Trying again…
2024-08-17 16:37:58: Healthcheck: DNS Resolution not possible after 3 attempts for hub.docker.com… Gave up!
2024-08-17 16:37:58: Healthcheck: Too many DNS failures (1 failures allowed, you got 3 failures), marking Healthcheck as unhealthy…

ping -c1 1.1.1.1
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=53 time=29.332 ms

— 9.9.9.9 ping statistics —
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 35.367/35.367/35.367 ms

dig +short fuzzy.mailcow.email
95.217.129.125

dig +short github.com
140.82.121.4

dig +short hub.docker.com
elb-default.us-east-1.aws.dckr.io.
prodextdefgreen-k0uuibjyui-4ec6503f7037d339.elb.us-east-1.amazonaws.com.
44.219.3.189
3.224.227.198
44.193.181.103

More info while beeing attached to the unbound container:

ping -c1 1.1.1.1
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=53 time=29.332 ms

— 9.9.9.9 ping statistics —
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 35.367/35.367/35.367 ms

dig +short fuzzy.mailcow.email
95.217.129.125

dig +short github.com
140.82.121.4

dig +short hub.docker.com
elb-default.us-east-1.aws.dckr.io.
prodextdefgreen-k0uuibjyui-4ec6503f7037d339.elb.us-east-1.amazonaws.com.
44.219.3.189
3.224.227.198
44.193.181.103