Article Tags
Article Tags
How to limit CPU and memory usage for a Docker container? (Resource constraints)
When docker runs, use --cpus and --memory to directly limit the CPU and memory. Please note that --memory-swap is used to disable swap, the unit must be lowercase, cgroupsv2 compatibility and the OOMkiller mechanism; docker-compose needs to be configured under deploy.resources.limits, and the cpus value must be added in single quotes.
Mar 18, 2026 am 12:37 AM
How to mount a host directory to a Docker container? (Bind mounts)
Docker-v mounting must use an absolute path (such as /home/user/data), and a relative path (such as ./data) will fail; make sure that the host path exists and has read and write permissions, and pay attention to UID/GID matching, SELinux/AppArmor restrictions, and macOS/Windows performance differences.
Mar 18, 2026 am 12:13 AM
How to scan Docker images for security vulnerabilities? (Safety audit)
Trivy is an officially recommended open source image scanning tool, replacing the deprecated dockerscan; it supports multi-language dependency and OS package vulnerability detection. You need to select the scanning mode according to the basic image type. It is recommended to use --timeout and --light in CI to ensure stability.
Mar 17, 2026 am 12:48 AM
How to run Docker without sudo privileges on Linux? (Rootless mode)
Docker still needs sudo because the docker group permissions are not effective or the rootless mode is not enabled; true rootless needs to be installed with dockerd-rootless-setuptool.sh, the binding port is ≥1024, and the function is limited by namespace isolation.
Mar 17, 2026 am 12:24 AM
How to run Docker inside a Docker container? (DinD explanation)
Direct dockerrun--privileged running Docker in the container has a high probability of failure. The main reason is that CONFIG_CGROUPS/CONFIG_NAMESPACES is not enabled in the host kernel, nested cgroups are disabled when the container is running, or dockerd is missing from the image. To be truly feasible, three prerequisites must be met: the host supports nesting, the image contains a complete daemon, and startup avoids socket permission conflicts with cgroups. It is recommended to use buildctl first. BuildKit or mount the host docker.sock. Only a few scenarios such as dynamic container generation require docker:dind.
Mar 16, 2026 am 12:49 AM
How to run a cron job inside a Docker container? (Task scheduling)
The fundamental reason why cron in the container "seems to be running but actually fails" is that the base image does not have a cron daemon by default, and cron cannot run stably as PID1 under the Docker single-process model. A reliable solution is to set cron-f to PID1, preset crontab files, absolute path scripts, explicit environment variables, and configure time zones and logs.
Mar 16, 2026 am 12:42 AM
How to keep Docker containers running after a reboot? (Restart policies)
Docker containers do not automatically restart by default, and the --restart parameter needs to be explicitly specified: no (default), always, unless-stopped (most commonly used), on-failure[:max-retries]; running containers cannot hot update this policy and must be stopped and re-run; docker-compose can directly modify the restart field in yml; avoid conflicts caused by repeated management when coexisting with systemd.
Mar 15, 2026 am 12:29 AM
How to install a private Docker Registry locally? (Self-hosted repo)
Dockerpush failed because the registry defaults to HTTP and insecure-registries are not configured; daemon.json needs to be modified to add localhost:5000 and restart Docker; data needs to be mounted on the host directory for persistence with -v; basic authentication must use htpasswd to generate files and correctly mount and configure environment variables.
Mar 15, 2026 am 12:05 AM
How to backup and restore Docker volumes? (Disaster recovery)
The dockervolume command itself does not provide backup or restore subcommands. Backup must be implemented through the host's direct tarvolume path (such as /var/lib/docker/volumes/myvol/_data). Before restoring, you must deactivate the relevant containers and ensure that the volume has been created and is not occupied.
Mar 14, 2026 am 12:42 AM
How to override the default entrypoint in Docker? (Command line)
--entrypoint can directly overwrite the image ENTRYPOINT and only accepts a single executable path. The parameters must be placed after the image name; the shell form must be separated by --, such as --entrypointsh---c "cmd"; use "" or [] to clear the entry.
Mar 14, 2026 am 12:27 AM
How to enable Docker remote API access? (Daemon configuration)
You need to configure "hosts": ["unix:///var/run/docker.sock", "tcp://0.0.0.0:2376"] in daemon.json and restart the docker service. The production environment must enable TLS encryption (port 2376) instead of plain text 2375, and the firewall and certificate verification must be used when binding 0.0.0.0.
Mar 13, 2026 am 12:47 AM
How to visualize Docker containers with a GUI? (Portainer setup)
The main reasons why Portainer cannot open http://localhost:9000 are port conflicts, missing or incorrect Dockersocket mounting, insufficient permissions, and unstable image versions. You need to check the port occupancy, container status, socket path and permissions, and use a clear stable version of the CE image.
Mar 13, 2026 am 12:10 AM
How to deploy a Flask application with Docker? (Gunicorn setup)
Flask production deployment must use Gunicorn instead of flaskrun: bind 0.0.0.0:8000, set workers ≥ 2, use gunicorn.conf.py to configure logs and preload, correctly set WORKDIR and EXPOSE in the Dockerfile, and add -p to map the port when starting.
Mar 12, 2026 am 12:25 AM
How to fix 'Docker daemon is not running' error? (Troubleshooting guide)
Dockerdaemon is not running, causing the command to report an error. You need to check the service status first: use systemctlis-activedocker for Linux, launchctllist|grepdocker for macOS, and check WSL2 and DockerDesktop settings for Windows.
Mar 12, 2026 am 12:09 AM
Hot tools Tags
Undress AI Tool
Undress images for free
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undresser.AI Undress
AI-powered app for creating realistic nude photos
ArtGPT
AI image generator for creative art from text prompts.
Stock Market GPT
AI powered investment research for smarter decisions
Hot Article
Popular tool
vc9-vc14 (32+64 bit) runtime library collection (link below)
Download the collection of runtime libraries required for phpStudy installation
VC9 32-bit
VC9 32-bit phpstudy integrated installation environment runtime library
PHP programmer toolbox full version
Programmer Toolbox v1.0 PHP Integrated Environment
VC11 32-bit
VC11 32-bit phpstudy integrated installation environment runtime library
SublimeText3 Chinese version
Chinese version, very easy to use
Hot Topics
20567
7
13667
4