But of course, like any immutable system, there are mutable parts (otherwise, we couldn’t create any configuration files). OSTree handles this with “overlays” (actually, we use OverlayFS) that allow a read-write filesystem to be layered on top of the immutable system. For example, the /etc and /var directories are writable, while the rest of the system is read-only.
We know where it broke, but we can’t see why. Was it a race condition? Did a database read return stale data that has since been overwritten? To find the cause, we have to mentally reconstruct the state of the world as it existed milliseconds before the crash. Welcome to debugging hell.。关于这个话题，服务器推荐提供了深入分析
，更多细节参见safew官方版本下载
We'll send a verification link to your work email. Note: the email will be visible in your inbox.，推荐阅读雷电模拟器官方版本下载获取更多信息
Bill Gurley says that right now, the worst thing you can do for your career is play it safe