Debian 12 (Proxmox Mail Gateway) and starting mailCow mail service

Hello.

If You have a problem with starting the MailCow mail service on the Debian 12 (Proxmox Mail Gateway iso) You can use this article.

1. Need to check what template to use Apparmor

root@pmg:/home/user# apparmor_status
apparmor module is loaded.
10 profiles are loaded.
9 profiles are in enforce mode.
docker-default
/usr/bin/freshclam
/usr/lib/NetworkManager/nm-dhcp-client.action
/usr/lib/NetworkManager/nm-dhcp-helper
/usr/lib/connman/scripts/dhclient-script
/usr/sbin/clamd
/{,usr/}sbin/dhclient
lsb_release
nvidia_modprobe
nvidia_modprobe//kmod
0 profiles are in complain mode
0 profiles are in kill mode.
0 profiles are in unconfined mode.
108 processes have profiles defined.
1 processes are in enforce mode.

 

2. Create apparmor template in /etc/apparmor.d/docker-default

#include <tunables/global>

profile docker-default flags=(attach_disconnected,mediate_deleted) {

#include <abstractions/base>

ptrace peer=@{profile_name},

network,
capability,
file,
umount,

deny @{PROC}/* w, # deny write for all files directly in /proc (not in a subdir)
# deny write to files not in /proc/<number>/** or /proc/sys/**
deny @{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9]*}/** w,
deny @{PROC}/sys/[^k]** w, # deny /proc/sys except /proc/sys/k* (effectively /proc/sys/kernel)
deny @{PROC}/sys/kernel/{?,??,[^s][^h][^m]**} w, # deny everything except shm* in /proc/sys/kernel/
deny @{PROC}/sysrq-trigger rwklx,
deny @{PROC}/kcore rwklx,
deny @{PROC}/mem rwklx,
deny @{PROC}/kmem rwklx,

deny mount,

deny /sys/[^f]*/** wklx,
deny /sys/f[^s]*/** wklx,
deny /sys/fs/[^c]*/** wklx,
deny /sys/fs/c[^g]*/** wklx,
deny /sys/fs/cg[^r]*/** wklx,
deny /sys/firmware/** rwklx,
deny /sys/kernel/security/** rwklx,
}

3. Then change mode from enforce to complaine

aa-complain /etc/apparmor.d/docker-default  

After that problem must be gone.

Bye.