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Docker Network manages container connectivity, DNS service name, bridge, port publishing and frontend/backend separation; see path errors and security errors.

Compose for simple deployment of single servers and Kubernetes for real needs of multi-node and orchestration; compare team cost, HA, rollout, state and growth.

The actual need for Kubernetes is measured by multiple nodes, SLO, number of service and deployment, tenancy and platform team; check for pre-requisites and low-risk pilot pathways.

The Restart Policy specifies what Docker does after the container is removed or the daemon restarted. Learn the differences between no, on-failure, always and unless-stopped and common errors.

For containers that are constantly restarted, check the restart count, exit code, OOMKilled, previous log, command, secret, permission and dependency without deleting the evidence.

Reduce the size of the Docker image by checking the layers, small context, multi-stage build, production dependency, and appropriate base without removing the necessary library or compromising patch capabilities.

Excessive program output and logging driver without rotation can fill the disk. Set active driver, log storm cause, max-size/max-file, retention and warning in principle.

Healthcheck measures the response capacity of the container with a command. See process differences, readiness and dependency, interval/timeout/retries settings, and common errors.

Volume keeps data outside the written layer container. Check the differences between volume, bind mount and tmpfs, permissions, lifecycle, performance and selection criteria.

To backup Volume, first specify the data type and consistency; save, encrypt, and restore the database with native tools and files with pause or controlled snapshot.

Disk decoder usage can be image, container layer, log, volume, or build cache. First, find the location and owner, and then proceed with the exact backup and target.

To connect Nginx to Docker, set up a shared network, service name, host and forwarded header, WebSocket, timeout, upstream health, and IP trust limit.