Фото: Kenny Holston/The New York Times / Reuters
NamespaceWhat it isolatesWhat the process seesPIDProcess IDsOwn process tree, starts at PID 1MountFilesystem mount pointsOwn mount table, can have different rootNetworkNetwork interfaces, routingOwn interfaces, IP addresses, portsUserUID/GID mappingCan be root inside, nobody outsideUTSHostnameOwn hostnameIPCSysV IPC, POSIX message queuesOwn shared memory, semaphoresCgroupCgroup root directoryOwn cgroup hierarchyTimeSystem clocks (monotonic, boot)Own system uptime and clock offsetsNamespaces are what Docker containers use. When you run a container, it gets its own PID namespace (cannot see host processes), its own mount namespace (own filesystem view), its own network namespace (own interfaces), and so on.
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至于 Thumbs.db，在 Windows 早期版本中确实随文件夹存储，但自 Windows Vista 起，缩略图缓存已被改为中心化存储在用户的 AppData 目录下（文件名为 thumbcache_xxx.db）。这一改变使得该文件淡出了普通用户的视野。
fills up, so we can eventually append most new tasks to the slice