adm@ubuntu-host:/$ sudo systemctl restart docker
Job for docker.service failed because the control process exited with error code.
See “systemctl status docker.service” and “journalctl -xe” for details.
adm@ubuntu-host:/$ sudo systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Fri 2025-09-26 13:14:01 CST; 4min 53s ago
TriggeredBy: ● docker.socket
Docs: https://docs.docker.com
Process: 12734 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE)
Main PID: 12734 (code=exited, status=1/FAILURE)
Sep 26 13:14:01 ubuntu-host systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.
Sep 26 13:14:01 ubuntu-host systemd[1]: Stopped Docker Application Container Engine.
Sep 26 13:14:01 ubuntu-host systemd[1]: docker.service: Start request repeated too quickly.
Sep 26 13:14:01 ubuntu-host systemd[1]: docker.service: Failed with result ‘exit-code’.
Sep 26 13:14:01 ubuntu-host systemd[1]: Failed to start Docker Application Container Engine.
adm@ubuntu-host:/$ sudo dockerd
INFO[2025-09-26T13:20:32.765113826-06:00] Starting up
INFO[2025-09-26T13:20:32.765831323-06:00] detected 127.0.0.53 nameserver, assuming systemd-resolved, so using resolv.conf: /run/systemd/resolve/resolv.conf
INFO[2025-09-26T13:20:32.780582175-06:00] [graphdriver] using prior storage driver: overlay2
INFO[2025-09-26T13:20:32.780827570-06:00] Loading containers: start.
INFO[2025-09-26T13:20:32.802337375-06:00] Firewalld: docker zone already exists, returning
WARN[2025-09-26T13:20:33.169157000-06:00] could not create bridge network for id 5f8dc2c1afa132403c3a5f9ea833d202de779dcbc1078a0618547f3d94d79ccd bridge name docker0 while booting up from persistent state: Failed to program NAT chain: ZONE_CONFLICT: ‘docker0’ already bound to a zone
INFO[2025-09-26T13:20:33.176623483-06:00] Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to set a preferred IP address
INFO[2025-09-26T13:20:33.247586738-06:00] stopping event stream following graceful shutdown error=“” module=libcontainerd namespace=moby
failed to start daemon: Error initializing network controller: Error creating default “bridge” network: Failed to program NAT chain: ZONE_CONFLICT: ‘docker0’ already bound to a zone
INFO[2025-09-26T13:20:33.248314257-06:00] stopping event stream following graceful shutdown error=“context canceled” module=libcontainerd namespace=plugins.moby