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How to share Docker images without a registry? (Save and load commands)
The tar file generated by dockersave must contain the complete image layer, manifest.json and repositories files in order to be loaded correctly by dockerload, otherwise it will report invalidimagetarball or the image ID is empty; be sure to use the -o option to save, verify the integrity and ensure the existence of the basic image.
Mar 04, 2026 am 01:16 AM
How to install Docker Compose on Ubuntu 22.04? (Step-by-step setup)
Docker's official v2 dockercompose plug-in should be installed instead of the pip version docker-composev1; it is necessary to ensure Dockerv23.0, put the precompiled binary into ~/.docker/cli-plugins/docker-compose and set execution permissions, and the user joins the docker group.
Mar 03, 2026 am 12:32 AM
How to use multiple Docker Compose files? (Environment overrides)
When docker-compose-f specifies multiple files, they are loaded in order from the command line. The subsequent file overwrites the scalar fields (such as image) of the service with the same name as the previous file, and the array fields (ports, volumes) are appended. Missing fields are not overwritten; service names are case-sensitive; --env-file only injects environment variables and does not participate in configuration merging; docker-compose.override.yml is loaded automatically and cannot be disabled; extends is unstable across files and is not recommended for production environments.
Mar 03, 2026 am 12:15 AM
How to automate Docker image builds with GitHub Actions? (CI/CD pipeline)
In GitHubActions, you need to manually configure on.push or on.pull_request and use paths to filter the trigger timing. Specify the Dockerfile path, registry, and credentials (such as ghcr.io github.actor GITHUB_TOKEN for GHCR) to avoid repeated builds and path errors.
Mar 02, 2026 am 01:27 AM
How to run a Python script inside a Docker container? (Environment setup)
The container exits due to the end of the foreground process, so you need to ensure that the Python script continues to run; give priority to using the official python image, reasonably layer COPY and WORKDIR, and pay attention to the consistency of the network, time zone, encoding and other environments.
Mar 02, 2026 am 12:22 AM
How to fix permission denied errors in Docker volumes? (User ownership)
Dockerrunfailswith“Permissiondenied”onmountedvolumesduetoUID/GIDmismatchbetweenhostfilesandcontaineruser—LinuxenforcesstrictnumericUIDownership,notusernames;fixesinclude--user,customUSERinDockerfile,orchowninghostdir.
Mar 01, 2026 am 12:13 AM
How to tag and push images to Docker Hub? (Registry management)
The dockertag must be added with the DockerHub user name and warehouse name, in the format dockertag/:, such as dockertagmyapp:latestalice/myapp:1.2; underlines are disabled in the image name, and only dashes and alphanumeric characters are supported.
Feb 28, 2026 am 12:45 AM
How to install Docker Engine on Debian 12? (Server configuration)
Docker-ce and docker-ce-cli must be installed through Docker's official APT repository (the versions are strictly aligned), and containerd.io must be installed; non-root users need to join the docker group and log in again; make sure to use the cgroupv2 compatible docker-ce ≥ 20.10 version.
Feb 28, 2026 am 12:28 AM
How to run older versions of software using Docker? (Legacy support)
Using Docker to run old versions of Python (such as 2.7) can avoid contaminating the host system; it is recommended to use python:2.7-slim or python:2.7 mirrors, and use -alpine with caution; you need to manually create the /usr/bin/python soft link and fix the pip version.
Feb 27, 2026 am 01:07 AM
How to set environment variables in Docker Compose? (.env file tutorial)
DockerCompose automatically loads the root directory .env file by default to replace the ${VAR_NAME} placeholder in docker-compose.yml, but does not inject it into the container; variables need to be explicitly passed to the container through environment or env_file.
Feb 27, 2026 am 12:56 AM
How to run Docker on macOS with Apple Silicon? (M1/M2/M3 chip support)
DockerDesktopfailsonM1/M2/M3Macsduetox86_64binaryincompatibilityorIntel-onlyinstallation;usearm64-nativeDockerDesktopanddockerd,verifywithdockerinfo,pull/buildwith--platformlinux/arm64,orswitchtocolimaforfasterARM64-nativecontainerruntime.
Feb 26, 2026 am 03:25 AM
How to remove all unused Docker images and containers? (System prune guide)
The safest and most efficient way to clean a Docker disk is dockersystemprune-a, which deletes all images that are not referenced by any container (including stopped), stopped containers, network and build cache, but does not delete running containers and their dependent images.
Feb 26, 2026 am 02:43 AM
How to connect two Docker containers on the same network? (Bridge networking)
A custom bridge network (such as mynet) must be used to implement container name resolution. Docker's built-in DNS supports automatic IP update; disable --link and host port mapping, and containers communicate directly with container names.
Feb 25, 2026 am 02:33 AM
How to debug a crashing Docker container immediately? (Exit code analysis)
The container exit code is the core basis for diagnosing crashes. You need to use dockerps-a to check the Exited (X) record. 137 means OOM kill and 139 means segfault. When the log is empty, you should use --entrypointsh for manual debugging and combine it with dockerevents for real-time monitoring.
Feb 25, 2026 am 01:20 AM
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