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How can you configure DNS resolution for Docker containers?

How can you configure DNS resolution for Docker containers?

The DNS resolution of Docker containers can be configured in three ways. By default, Docker sets an internal DNS server for containers in a custom network, so that containers can be parsed with each other through service names; if you need to customize, you can use the --dns flag to specify the DNS server when running the container; for the DockerCompose environment, you can configure the dns and dns_search parameters in the docker-compose.yml file to achieve more granular control; if you need global unified configuration, you can edit the Docker daemon configuration file /etc/docker/daemon.json and restart the Docker service to make the configuration take effect. Each method is suitable for different scenarios.

Jul 03, 2025 am 12:25 AM
docker dns
What is Docker, and why is it used in software development?

What is Docker, and why is it used in software development?

Docker is a platform that allows developers to build, run and manage applications in containers, solving the problem of "can run on my machine" and ensuring consistency between different environments. 1. The container is similar to a lightweight virtual machine, and it shares the host OS kernel, only contains applications and their dependencies. It has isolation, versionability and easy-to-share features to avoid environment-related bugs. 2. The reasons why developers like Docker include environmental consistency, simplifying dependency management, speeding up newcomers to get started, and good service isolation, which is especially suitable for microservice architecture. 3. Docker integrates modern development processes, supports local development, CI/CD pipelines, cloud deployment and other scenarios. Combined with DockerCompose, you can define and run multi-container applications, so that software construction and

Jul 03, 2025 am 12:04 AM
docker software development
How can you view the logs of a Docker container?

How can you view the logs of a Docker container?

To view Docker container logs, use the dockerlogs command mainly. 1. Use dockerlogs [container name or ID] to view the log directly; 2. Add the -f parameter to track the log output in real time; 3. Use --timestamps or -t to display timestamps; 4. Use --since and --until to filter the logs by time range; 5. If the container has no shell, you can still access the stdout/stderr logs through dockerlogs, or mount the volume to access custom log files; 6. You can check the log driver used by the container through dockerinspect. If it is not the default JSON-file driver, you need to check the corresponding external system.

Jul 02, 2025 am 01:02 AM
How can I contribute to the Docker community?

How can I contribute to the Docker community?

Contributing to the Docker community can start from four aspects: 1. Participate in open source projects and code contributions, submit bug fixes or implement new functions on GitHub, follow the specifications and communicate more; 2. Improve documents and translations, correct errors, update examples, supplement best practices, or conduct multilingual translation; 3. Active in the community platform, answer questions, share experiences, correct error information, and improve the quality of interaction; 4. Organize activities or write articles, disseminate knowledge through blogs, local sharing sessions, online meetings, etc., promote the construction of the community atmosphere, select directions based on your own interests and continue to participate, and gradually integrate into the community.

Jul 02, 2025 am 12:08 AM
What is the purpose of the EXPOSE instruction in a Dockerfile?

What is the purpose of the EXPOSE instruction in a Dockerfile?

EXPOSE is used in Dockerfile to declare the network port the container will listen for at runtime, but it will not be published automatically to the host. Its core role is to provide documentation and configuration tips to help developers and tools understand the ports used by the application. To make the port accessible from the outside, you still need to use the -p parameter to map when running the container, for example: dockerrun-p8080:80my-web-app. The main reasons for using EXPOSE include improving clarity, supporting tool integration, and following best practices. Containers can directly access each other's exposed ports in the same custom network, but to access them on the host, the ports must be published explicitly. A common error is that you forget to map the port when running the container, causing the service to fail.

Jul 01, 2025 am 12:45 AM
EXPOSE
What are Docker containers, and how are they run?

What are Docker containers, and how are they run?

Docker containers are a lightweight, portable way to package applications and their dependencies together to ensure applications run consistently in different environments. Running instances created based on images enable developers to quickly start programs through "templates". Run the dockerrun command commonly used in containers. The specific steps include: 1. Install Docker; 2. Get or build a mirror; 3. Use the command to start the container. Containers share host kernels, are lighter and faster to boot than virtual machines. Beginners recommend starting with the official image, using dockerps to view the running status, using dockerlogs to view the logs, and regularly cleaning resources to optimize performance.

Jul 01, 2025 am 12:13 AM
What is Docker Swarm, and how does it work?

What is Docker Swarm, and how does it work?

DockerSwarm is a clustering and orchestration tool for managing multiple Docker hosts. Its core function is to deploy and scale containerized applications as a single virtual host. It adopts the architecture of management nodes and work nodes. The management node is responsible for scheduling and service management. The work node runs containers, and supports the elastic expansion and capacity of services and self-healing of faults. To initialize the Swarm cluster, first run the dockerswarminit command on one machine, and then use the output join command to join other nodes as workers. When deploying services, dockerservicecreate must specify parameters such as mirror, number of replicas and network ports. Swarm will automatically distribute and maintain it across nodes.

Jun 30, 2025 am 12:25 AM
What are some common Docker errors and how do you fix them?

What are some common Docker errors and how do you fix them?

When encountering common Docker errors, you can resolve them in the following ways: 1. Use lsof or netstat to check the process and replace the port; 2. When a port conflict occurs, you need to check whether the COPY path is correct and ensure that the construction context is used; 3. When the container exits, you should check the status of the main process, add -d background operation or view the log; 4. When the mount fails, you need to set the permission mark: z or close SELinux. When troubleshooting problems, make good use of logs and debugging commands, and most problems can be solved through basic operation positioning.

Jun 30, 2025 am 12:06 AM
How does Docker work with Java?

How does Docker work with Java?

DockerworkswithJavabypackagingapplicationsanddependenciesintoportablecontainers.TorunaJavaappinDocker,createaDockerfilethatdefinesthebuildsteps.AbasicDockerfileusesaJavabaseimagelikeopenjdk:17-jdk-slim,setsaworkingdirectory,copiestheJARfile,andspecif

Jun 29, 2025 am 12:16 AM
How do you scale applications in Kubernetes?

How do you scale applications in Kubernetes?

Kubernetesprovidesmanualandautomaticscalingmethods.Manualscalinguseskubectlscalefordirectcontrol,idealforpredictableworkloads,butrequiresmanualadjustmentbackdown.AutomaticscalingusestheHorizontalPodAutoscaler(HPA)basedonmetricslikeCPUusage,adjustingr

Jun 29, 2025 am 12:08 AM
Application extension
How do you create a Docker volume?

How do you create a Docker volume?

A common way to create a Docker volume is to use the dockervolumecreate command and specify the volume name. The steps include: 1. Create a named volume using dockervolume-createmy-volume; 2. Mount the volume to the container through dockerrun-vmy-volume:/path/in/container; 3. Verify the volume using dockervolumels and clean useless volumes with dockervolumeprune. In addition, anonymous volume or binding mount can be selected. The former automatically generates an ID by Docker, and the latter maps the host directory directly to the container. Note that volumes are only valid locally, and external storage solutions are required across nodes.

Jun 28, 2025 am 12:51 AM
docker volume
How do you specify environment variables in a Docker container?

How do you specify environment variables in a Docker container?

There are three common ways to set environment variables in a Docker container: use the -e flag, define ENV instructions in a Dockerfile, or manage them through DockerCompose. 1. Adding the -e flag when using dockerrun can directly pass variables, which is suitable for temporary testing or CI/CD integration; 2. Using ENV in Dockerfile to set default values, which is suitable for fixed variables that are not often changed, but is not suitable for distinguishing different environment configurations; 3. DockerCompose can define variables through environment blocks or .env files, which is more conducive to development collaboration and configuration separation, and supports variable replacement. Choose the right method according to project needs or use multiple methods in combination

Jun 28, 2025 am 12:22 AM
docker environment variables
How do you use Docker system prune to clean up unused resources?

How do you use Docker system prune to clean up unused resources?

Dockersystemrune is a command to clean unused resources that delete stopped containers, unused networks, dangling images, and build caches. 1. Run dockersystemrune by default to clean up the hanging mirror and prompt for confirmation; 2. Add the -f parameter to skip confirmation; 3. Use --all to delete all unused images; 4. Use --filter to clean the cache by time; 5. Execute this command regularly to help maintain the clean environment and avoid insufficient disk space.

Jun 27, 2025 am 12:33 AM
How do you manage Docker Swarm nodes?

How do you manage Docker Swarm nodes?

ManagingDockerSwarmnodesinvolveskeysteps:addingnodesusingjointokens,promotingordemotingnodeswithdockernodepromote/demotewhilemaintainingquorum,removingnodesviadockernodermafterdrainingtasks,andcheckingnodestatuswithdockernodelsanddockernodeinspect.Al

Jun 27, 2025 am 12:03 AM
Node Management

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