Z9264/201911-170/NAT is not running in the latest November image

Description:
============
Nat container is not running in the latest image

root@sonic:~# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
28bc2fb500f3 docker-sonic-telemetry:latest "/usr/bin/supervisord" 5 hours ago Up 44 minutes telemetry
e27e5086141b docker-snmp-sv2:latest "/usr/bin/supervisord" 5 hours ago Up 44 minutes snmp
d63e7415c56a docker-lldp-sv2:latest "/usr/bin/docker-lld…" 5 hours ago Up About an hour lldp
96a4a65bfc34 docker-router-advertiser:latest "/usr/bin/docker-ini…" 5 hours ago Up About an hour radv
0f07e9f6aadc docker-sonic-mgmt-framework:latest "/usr/bin/supervisord" 5 hours ago Up About an hour mgmt-framework
955fdf680ddf docker-dhcp-relay:latest "/usr/bin/docker_ini…" 5 hours ago Up About an hour dhcp_relay
797ba772beec docker-syncd-brcm:latest "/usr/bin/supervisord" 5 hours ago Up About an hour syncd
b0387b9a1d2b docker-teamd:latest "/usr/bin/supervisord" 5 hours ago Up About an hour teamd
d2f1ecd5f4a3 docker-orchagent:latest "/usr/bin/docker-ini…" 5 hours ago Up About an hour swss
c9076d2c96da docker-fpm-frr:latest "/usr/bin/supervisord" 5 hours ago Up About an hour bgp
28cb8500068a docker-platform-monitor:latest "/usr/bin/docker_ini…" 5 hours ago Up About an hour pmon
3195be5b90ce docker-database:latest "/usr/local/bin/dock…" 5 hours ago Up About an hour database
root@sonic:~#

root@sonic:~# docker start nat
Error response from daemon: No such container: nat
Error: failed to start containers: nat

root@sonic:~# ps -ax | grep nat
8161 ttyS0 S+ 0:00 grep nat

root@sonic:~# systemctl start nat
Failed to start nat.service: Unit nat.service is masked.
root@sonic:~#

root@sonic:~# show ver

SONiC Software Version: SONiC.HEAD.170-c243b8a9
Distribution: Debian 9.13
Kernel: 4.9.0-11-2-amd64
Build commit: c243b8a9
Build date: Tue Aug 25 18:59:41 UTC 2020
Built by: johnar@jenkins-worker-7

Platform: x86_64-dellemc_z9264f_c3538-r0
HwSKU: DellEMC-Z9264f-C64
ASIC: broadcom
Serial Number: CN030K8MDND0093E0001
Uptime: 09:04:28 up 51 min, 1 user, load average: 0.81, 0.80, 0.81

Working image:
=============

root@sonic:~# ps -ax | grep nat
2797 ? Ss 0:00 /bin/bash /usr/bin/nat.sh wait
2803 ? Sl 0:04 docker wait nat
3054 ? S 0:00 python /usr/bin/supervisor-proc-exit-listener --container-name nat
3170 ? Sl 0:02 /usr/bin/natmgrd
3234 ? Sl 0:57 /usr/bin/natsyncd
7770 ttyS0 S+ 0:00 grep nat

root@sonic:~# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3d33718ffe73 docker-lldp-sv2:latest "/usr/bin/docker-lld…" 8 days ago Up 25 hours lldp
05f559c63a56 docker-sonic-telemetry:latest "/usr/bin/supervisord" 12 days ago Up 25 hours telemetry
b28ebb2967ca docker-snmp-sv2:latest "/usr/bin/supervisord" 12 days ago Up 25 hours snmp
ac912fc0a3cc docker-nat:latest "/usr/bin/supervisord" 12 days ago Up 25 hours nat >>>>>>>>>>>>>>>>>>>>>>
9394019bfed8 docker-dhcp-relay:latest "/usr/bin/docker_ini…" 12 days ago Up 25 hours dhcp_relay
c68a0a4efef4 docker-router-advertiser:latest "/usr/bin/supervisord" 12 days ago Up 25 hours radv
7db3c728f766 docker-sonic-mgmt-framework:latest "/usr/bin/supervisord" 12 days ago Up 25 hours mgmt-framework
3b1703a37909 docker-syncd-brcm:latest "/usr/bin/supervisord" 12 days ago Up 25 hours syncd
b7288f2f38ca docker-teamd:latest "/usr/bin/supervisord" 12 days ago Up 25 hours teamd
47707fffc9f6 docker-orchagent:latest "/usr/bin/supervisord" 12 days ago Up 25 hours swss
37560538e181 docker-fpm-frr:latest "/usr/bin/supervisord" 12 days ago Up 25 hours bgp
928ba16bfeb0 docker-platform-monitor:latest "/usr/bin/docker_ini…" 12 days ago Up 25 hours pmon
9a9517cac12b docker-database:latest "/usr/local/bin/dock…" 12 days ago Up 25 hours database
root@sonic:~#

Thanks
Mini

Start with /usr/bin/nat.sh, nat.service, and the docker-nat image, comparing the failing image's container and process state with the working image. Check why nat is absent and the service is masked; done means the November image creates and runs the nat container with the expected NAT processes.