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Docker

How to setup Home Assistant using Docker on a Raspberry Pi?

HomeAssistantrequirestheghcr.io/home-assistant/home-assistant:stableimageonRaspberryPi—notthedeprecatedhomeassistant/home-assistant—duetoARM64/ARMv7support,properpermissions,andpersistent/configvolumeusage.

Jan 20, 2026 am 01:18 AM

How to synchronize time between Docker container and host machine?

In-container ntpd or systemd-timesyncd usually fails because it lacks CAP_SYS_TIME capabilities and cannot access the host RTC or kernel time interface; the time should be synchronized by the host, and the container only needs to mount the time zone file correctly and trust the host time.

Jan 19, 2026 am 12:33 AM

How to build ARM-compatible Docker images on an x86 machine

Use DockerBuildx and QEMU to build ARM images on x86 machines. 1. Enable Buildx and install QEMU: run dockerrun --privileged --rmtonistiigi/binfmt:latest --installall to support multiple architectures; 2. Create and start the builder: execute dockerbuildxcreate --namemybuilder --use and dockerbuildxinspect --bootstrap; 3. Build ARM image: specify the platform such as --platformlinux/arm64, use --pus

Jan 19, 2026 am 12:08 AM

How to use Docker Context to manage remote Docker daemons?

DockercontextswitchesbetweenDockerdaemons(local,remote,cloud)usingnamedprofileswithconnectiondetails,eliminatingmanualDOCKER_HOSTor--hostusage.Itenablestransparenttargetingofdaemonsforcommandslikedockerpsanddockerbuild,withSSH-basedcontextssimplifyin

Jan 18, 2026 am 02:04 AM

How to run a PostgreSQL database in Docker with persistent storage?

Use named volumes (such as pgdata) to achieve PostgreSQL data persistence, and Docker automatically manages paths, permissions, and upgrade security; disables bind mounts and anonymous volumes; the image automatically executes initdb and sets postgres user (UID999) ownership when running for the first time; create volumes through dockervolumecreate and mount them to /var/lib/postgresql/data.

Jan 18, 2026 am 12:32 AM

How to resolve Docker IP address conflicts with local network?

Docker's docker0 bridge network uses 172.17.0.0/16 by default. If it conflicts with the local LAN, the two-way communication between the container and the host will fail. You should configure default-address-pools (such as 10.200.0.0/16) through /etc/docker/daemon.json and optionally specify docker0IP in bip. It will take effect after restarting Docker.

Jan 17, 2026 am 01:46 AM

How to setup Ollama with Open WebUI using Docker Compose?

Ollamashouldrunnativelyonthehost—notinDockerCompose—toensureGPUaccess,propermodelstorage,andCLIfunctionality;OpenWebUIconnectstoitviaOLLAMA_BASE_URLpointingtothehost’s11434port.

Jan 17, 2026 am 01:27 AM

How to fix 'Docker permission denied' error on Linux?

Adding users to the docker group is a standard security solution: run sudousermod-aGdocker$USER, log out and log in again and verify with groups, and then test dockerrunhello-world without sudo.

Jan 16, 2026 am 01:03 AM

How to SSH into a running Docker container for debugging?

dockerexec is the standard way to enter the container without SSH; use the -it parameter to start the sh or bash interactive shell, but minimalist images such as distroless are not supported because they do not have a shell; running sshd in the container violates the single process principle and increases security risks.

Jan 16, 2026 am 12:11 AM