I am not sure for how long, but the container unbound (ver. 1.18) is always unhealthy. looking at the ports (netstat -tulpn) there is no listening on port 53, which is open in the UFW. at this point all the containers are up and running and healthy.

Check the watchdog logs, why it is unhealthy. Of course its not listening on port 53 von the host level, because its not an authorative name server (its just a resolver). It uses port 53 TCP/UDP outbound. And is listening only on the mailcow internal docker network.

well based on watchguard (in the mailcow admin website - Logs) it is 5 of 5 aka fully healthy. Should Iook at /var/logs?

As I described [here](https://community.mailcow.email/d/2860-ontainer-mailcowdockerized-unbound-mailcow-1-error/17), all the health check does is running `nslookup mailcow.email 127.0.0.1` inside the unbound container, i.e. asking unbound to resolve `mailcow.email`. If this fails, it's probably a DNS problem. You can try to run the command above manually inside the container to see if and why it fails.

> @"uniquegch"#p11675 at this point all the containers are up and running and healthy So... is unbound healthy or not? I'm confused 🤔

[upl-image-preview url=https://community.mailcow.email/assets/files/2023-11-20/1700503162-235166-image.png] [upl-image-preview url=https://community.mailcow.email/assets/files/2023-11-20/1700503224-406842-image.png]

I have the same problem. Reinstalled VM with Debian. Some Docker containers don't start because unbound is a requirement and unbound is started unhealthy. The `./healthcheck.sh` in the container says: `Maybe check your outbound firewall, as it needs to resolve DNS over TCP AND UDP!` ``` nslookup mailcow.email 127.0.0.1 ;; connection timed out; no servers could be reached ``` ``` ./docker-entrypoint.sh Setting console permissions... Receiving anchor key... Receiving root hints... ############################################################# 100.0% setup in directory /etc/unbound removing artifacts Setup success. Certificates created. Enable in unbound.conf file to use ```

I had the same issue. Searching my firewall-logs revealed, that mailcow (probably the unbound container) uses PING to check, if the public DNS resolver is reachable (in my case 1.1.1.1). This makes no sense for me. Instead, trying to resolve some names would make more sense, if you want to check if DNS works... I usually only allow what is really necessary. I didn't see any necessity to allow pings. I've just allowed Pings, now everything works. The unbound container switched to healthy again.

@"Giga"#p12771 it seems that the ping check (and a new netcat check) was only introduced last week by @"DerLinkman"#1496 in https://github.com/mailcow/mailcow-dockerized/commit/b29dc3799114089471253d31295a290c239b8488 And I agree that an ICMP check ~~as well as an HTTP/HTTPS check~~ for the unbound container doesn't really make sense... unbound needs to process DNS queries via DNS, afaik it doesn't ping any server ~~or uses HTTP/HTTPS~~ EDIT: OK, HTTPS checks indeed make sense if DNS over HTTPS is used

as permanent situation the container unbound is always unhealthy. but it seems not to have an impact. Where can I find more details. because trying to use docker compose logs container name is not working

@"uniquegch"#p13049 `docker compose logs unbound-mailcow`

container unbound unhealthy

DocFraggle

Ok. Is there at least an unound process?

docker compose exec unbound-mailcow /bin/bash 
bb8d9882a129:/# ps axl
PID   USER     TIME  COMMAND
    1 unbound  10:57 /usr/sbin/unbound
497294 root      0:00 /bin/bash
497338 root      0:00 ps axl

hansiputz

DocFraggle

Yes:

36cf36db0b8d:/# ps axl
PID USER TIME COMMAND
1 unbound 0:02 /usr/sbin/unbound
9473 root 0:00 /bin/bash
9485 root 0:00 ps axl

hansiputz

DocFraggle
As far as I understand:
The unbound DNS service should be running @127.0.0.1
The docker dns proxy on 127.0.0.11

I turned on debugging in data/conf/unbound/unbound.conf
server:
verbosity: 5

Then
nslookup www.heise.de 127.0.0.1

I can not find any error in the logfile:

mailcowdockerized-unbound-mailcow-1  | [1708544686] unbound[1:0] debug: udp request from ip4 127.0.0.1 port 56735 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544686] unbound[1:0] debug: cache memory msg=66072 rrset=66072 infra=15530 val=66352
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: timeout udp
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: svcd callbacks start
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: worker svcd callback for qstate 0x7f748a7494f0
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: mesh_run: start
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: iterator[module 1] operate: extstate:module_wait_reply event:module_event_noreply
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: iterator operate: query . NS IN
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: process_response: new external response event
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: iter_handle processing q with state QUERY RESPONSE STATE
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: query response was timeout
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: iter_handle processing q with state QUERY TARGETS STATE
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: processQueryTargets: . NS IN
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: processQueryTargets: targetqueries 0, currentqueries 0 sentcount 15
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: DelegationPoint<.>: 13 names (0 missing), 26 addrs (26 result, 0 avail) parentNS
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   A.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   B.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   C.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   D.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   E.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   F.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   G.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   H.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   I.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   J.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   K.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   L.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   M.ROOT-SERVERS.NET. * A AAAA
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 198.41.0.4 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:503:ba3e::2:30 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 170.247.170.2 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2801:1b8:10::b port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 192.33.4.12 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:500:2::c port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 199.7.91.13 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:500:2d::d port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 192.203.230.10 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:500:a8::e port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 192.5.5.241 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:500:2f::f port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 192.112.36.4 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:500:12::d0d port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 198.97.190.53 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:500:1::53 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 192.36.148.17 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:7fe::53 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 192.58.128.30 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:503:c27::2:30 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 193.0.14.129 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:7fd::1 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 199.7.83.42 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:500:9f::42 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip4 202.12.27.33 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    ip6 2001:dc3::35 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: rpz: iterator module callback: have_rpz=0
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 170.247.170.2 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2801:1b8:10::b port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 199.7.91.13 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=120000
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 192.203.230.10 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 192.112.36.4 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:500:12::d0d port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 198.97.190.53 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:7fe::53 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 199.7.83.42 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 202.12.27.33 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:500:2d::d port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:500:2f::f port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:500:a8::e port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:503:c27::2:30 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:500:2::c port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 192.33.4.12 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:dc3::35 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 192.58.128.30 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 198.41.0.4 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:7fd::1 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 192.5.5.241 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:500:9f::42 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:500:1::53 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 193.0.14.129 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip4 192.36.148.17 port 53 (len 16)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: servselect ip6 2001:503:ba3e::2:30 port 53 (len 28)
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug:    rtt=24064
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: selrtt 12032
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: sending query: . NS IN
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: sending to target: <.> 202.12.27.33#53
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: dnssec status: expected
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: mesh_run: iterator module exit state is module_wait_reply
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: mesh_run: end 5 recursion states (4 with reply, 0 detached), 24 waiting replies, 57 recursion replies sent, 0 replies dropped, 0 states jostled out
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: average recursion processing time 80.502487 sec
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: histogram of recursion processing times
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: [25%]=26.25 median[50%]=56.7273 [75%]=134.4
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: lower(secs) upper(secs) recursions
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:    0.262144    0.524288 1
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:    2.000000    4.000000 1
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:    4.000000    8.000000 2
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   16.000000   32.000000 16
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   32.000000   64.000000 11
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:   64.000000  128.000000 11
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info:  128.000000  256.000000 15
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: 0pvCD mod1  . NS IN
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: 1RDdc mod1 rep www.heise.de. A IN
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: 2RDdc mod1 rep www.spamassassin.heinlein-support.de. A IN
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: 3RDdc mod1 rep mailcow.email. A IN
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] info: 4RDdc mod1 rep www.spamassassin.heinlein-support.de. AAAA IN
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: cache memory msg=66072 rrset=66072 infra=15530 val=66352
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: svcd callbacks end
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: serviced_delete
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: close of port 57939
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: comm_point_close of 14: event_del
mailcowdockerized-unbound-mailcow-1  | [1708544687] unbound[1:0] debug: close fd 14

[unknown]

7da264423398:/# netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 127.0.0.11:36607        0.0.0.0:*               LISTEN      -
tcp        0      0 0.0.0.0:53              0.0.0.0:*               LISTEN      -
tcp        0      0 127.0.0.1:8953          0.0.0.0:*               LISTEN      -
tcp        0      0 :::53                   :::*                    LISTEN      -
udp        0      0 0.0.0.0:53              0.0.0.0:*                           -
udp        0      0 127.0.0.11:42495        0.0.0.0:*                           -
udp        0      0 :::53                   :::*                                -

DocFraggle

What’s the output of netstat inside unbound?

bb8d9882a129:/# netstat -tulpen
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 127.0.0.11:37507        0.0.0.0:*               LISTEN      -
tcp        0      0 0.0.0.0:53              0.0.0.0:*               LISTEN      -
tcp        0      0 127.0.0.1:8953          0.0.0.0:*               LISTEN      -
tcp        0      0 :::53                   :::*                    LISTEN      -
udp        0      0 0.0.0.0:53              0.0.0.0:*                           -
udp        0      0 127.0.0.11:39602        0.0.0.0:*                           -
udp        0      0 :::53                   :::*                                -

DocFraggle

And you still get a ‘connection refused’? I’m out of ideas… which OS are you using? Is there any local DNS daemon running, maybe because of an OS update? Maybe shutdown mailcow and check the host ports with netstat

hansiputz

DocFraggle

And you still get a ‘connection refused’?
Yes
I’m out of ideas…
same for me
which OS are you using?
Fedora39
Is there any local DNS daemon running, maybe because of an OS update? Maybe shutdown mailcow and check the host ports with netstat
systemd.resolved is running
but that should not disturb inside of the container
stopped it - no change :-(

Nevertheless: many thanks !!!!

Any other one with a (good) idea?

hansiputz

Hi
I think I got it fixed (not nice but works for me):

migrated from Fedora 29 to Debian 12 ==> no change
used an other unbound contaier ==> that helped

docker-compose.yml :

version: '2.1'
services:

    unbound-mailcow:
      image: mvance/unbound:latest  
      # image: mailcow/unbound:1.21
...

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