主题： administration
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Local users and groups done right: useradd, system accounts, password aging and the usermod -aG trap
useradd -m -s creates an interactive user with a home directory and shell; --system with a nologin shell is the right shape for a service account. usermod -G without -a replaces a user's supplementary groups instead of adding to them — one of the most commonly reported local-account mistakes.
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通过 Cockpit Web 控制台管理无图形界面的 RHEL 主机
Cockpit 为没有桌面图形界面的 RHEL 服务器提供基于浏览器的管理会话，并通过套接字激活，仅在首次连接时启动。本方法介绍如何启用它、使用其命名服务开放防火墙访问，以及它在服务器上实际适合完成哪些任务。
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Docker Engine host administration: daemon.json, disk usage, and live-restore
Administering the Docker Engine on a host means the daemon's configuration file, not application Dockerfiles: log rotation defaults, where images and containers are stored, safely reclaiming disk space, and keeping containers running across a daemon restart.
机器可读： JSON