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What should I do if the docker container cannot access the external network?
Reasons and solutions for docker containers unable to access external networks: Configure nat port mapping to map container ports to host ports. Choose the correct network driver (such as host or overlay) based on host compatibility. Allow container ports through the host's firewall. Configure the correct dns server for the container. Choose the correct container networking mode. Troubleshoot host network issues such as firewall or connectivity issues. This topic provides you with relevant articles, downloads, and course content for you to download and experience for free.
What should I do if the docker container cannot access the external network?Reasons and solutions for Docker containers not being able to access the external network: Configure NAT port mapping to map container ports to host ports. Choose the correct network driver (such as host or overlay) based on host compatibility. Allow container ports through the host's firewall. Configure the correct DNS servers for the container. Choose the correct container networking mode. Troubleshoot host network issues such as firewall or connectivity issues.
How to read logs when docker container keeps restartingWhen a Docker container keeps restarting, you can view the logs by using the docker logs [container name or ID] command to output the container's standard output and error streams. View container logs in Docker Dashboard. Specify the log volume in the docker-compose file. Set the log level to "debug" for more detailed information. Use the grep command to filter the logs to display only messages for specific keywords. Use -f to trace the logs and view them in real time.
Where are the internal files of the docker container?Docker container files are stored in the container file system, which is isolated from the host file system, at /var/lib/docker/containers// / and /var/lib/docker/overlay2/ /merged/. Container files can be accessed through the Docker exec, Docker cp, and Docker inspect commands. 
How to communicate between docker containersThere are five methods for container communication in the Docker environment: shared network, Docker Compose, network proxy, shared volume, and message queue. Depending on your isolation and security needs, choose the most appropriate communication method, such as leveraging Docker Compose to simplify connections or using a network proxy to increase isolation.
What does docker container meanA Docker container is a lightweight, portable unit of software that contains the dependencies needed to run an application, similar to a virtual machine but more lightweight. Docker containers are isolated, portable, consistent, resource efficient, and automatable for application development, deployment, microservices architecture, CI/CD, and cloud computing.
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