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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.

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.

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.

Compose can be suitable for single-server production, provided you know the constants of image, backup, healthcheck, secret, monitoring and rollback; HA and rollout.

Fix the SSL extension failure by checking the timer, renewal config, DNS, HTTP/DNS challenge, firewall, credential, rate limit and reload service step by step.

Design a professional server backup with RPO/RTO, compatible database and file versions, encryption, retention, separation, immutability, monitoring and restore testing.

Server monitoring should cover user access, latency, error, CPU, RAM, disk, network, service, database, TLS and backup with Alert and Runbook that can be acted upon.

Fail2ban temporarily blocks logs for failure patterns and IPs; identify restrictions, jail, backend, firewall, test and prevent lockdown.