To give some detail, it’s /var that is writable, and mutable directories will have symbolic links pointing to subdirectories of /var:
Фото: Владимир Вяткин / РИА Новости。爱思助手下载最新版本对此有专业解读
The developer is never warned that the keys' privileges changed underneath it. (The key went from public identifier to secret credential).，这一点在爱思助手下载最新版本中也有详细论述
Lowest danger rate