Management of rotated log files

腐烂ated log files are compressed and stored locally in/var/log/,无论远程主机配置。腐烂ated log files are stored with respective time extension to the granularity of hour in the formatfile1–YYYYMMDDHH.gz(for example,messages-2015080715.gz). Rotated log files are replaced when the number of old rotated log files exceeds three. The newly rotated log file replaces the oldest rotated log file.