NAME
       logrotate - rotates, compresses, and mails system logs
SYNOPSIS
       logrotate [-dv] [-f|--force] [-s|--state file] config_file+

DESCRIPTION       logrotate  is  designed to ease administration of systems that generate       large numbers of log files.  It allows automatic rotation, compression,       removal, and mailing of log files.  Each log file may be handled daily,       weekly, monthly, or when it grows too large.       Normally, logrotate is run as a daily cron job.  It will not  modify  a       log  multiple  times  in  one  day unless the criterium for that log is       based on the log’s size and logrotate is being run multiple times  each       day, or unless the -f or -force option is used.       Any number of config files may be given on the command line. Later con-       fig files may override the options given in earlier files, so the order       in  which  the logrotate config files are listed in is important.  Nor-       mally, a single config file which includes any other config files which       are  needed  should  be used.  See below for more information on how to       use the include directive to accomplish this.  If a directory is  given       on  the  command line, every file in that directory is used as a config       file.       If no command line arguments are given, logrotate  will  print  version       and  copyright  information,  along with a short usage summary.  If any       errors occur while rotating logs, logrotate  will  exit  with  non-zero       status.OPTIONS       -v     Turn on verbose mode.       -d     Turns  on  debug mode and implies -v.  In debug mode, no changes              will be made to the logs or to the logrotate state file.       -f, --force              Tells logrotate to force the rotation, even if it doesn’t  think              this  is  necessary.   Sometimes this is useful after adding new              entries to logrotate, or if old log files have been  removed  by              hand,  as  the  new files will be created, and logging will con-              tinue correctly.       -m, --mail <command>              Tells logrotate which command to use  when  mailing  logs.  This              command  should accept two arguments: 1) the subject of the mes-              sage, and 2) the recipient. The command must then read a message              on standard input and mail it to the recipient. The default mail              command is /bin/mail -s.       -s, --state <statefile>              Tells logrotate to use an alternate state file.  This is  useful              if  logrotate  is being run as a different user for various sets              of log files.  The default state file is /var/lib/logrotate/sta-              tus.       --usage              Prints a short usage message.CONFIGURATION FILE       logrotate  reads  everything  about the log files it should be handling       from the series of configuration files specified on the  command  line.       Each configuration file can set global options (local definitions over-       ride global ones, and later  definitions  override  earlier  ones)  and       specify  a  logfile  to  rotate. A simple configuration file looks like       this:       # sample logrotate configuration file
       compress
       # 最开始几行是全局配置，rotated之后进行compress压缩。只要第一个非空白字符为是#。

       # 下面定义 /var/log/messages目录下的日志文件rotate的配置。日志文件会保留5个周。日志文件rotate后（但是在旧的日志文件压缩前），命令/usr/bin/killall -HUP syslogd会被执行       /var/log/messages {            rotate 5           weekly           postrotate               /usr/bin/killall -HUP syslogd           endscript       }
       # 下面片段是定义两个日志文件的的参数配置。当他们超过100k的时候，在经过5个rotate周期后，旧的日志文件将邮件（不压缩）到www@my.org。sharedscripts表示 postrotate配置在旧的日志文件压缩后仅执行一次，而不在每个日志文件rotate之后都执行。注意到第一个文件的双引号，允许日志文件名包含空格。       "/var/log/httpd/access.log" /var/log/httpd/error.log {           rotate 5           mail www@my.org           size=100k           sharedscripts           postrotate               /usr/bin/killall -HUP httpd           endscript       }
       # 最后一个配置定义，针对目录下所有文件，包含之前已经rotate日志文件。       /var/log/news/* {           monthly           rotate 2           olddir /var/log/news/old           missingok           postrotate                kill -HUP ‘cat /var/run/inn.pid‘           endscript           nocompress       }       The first few lines set global options; in the example, logs  are  com-       pressed after they are rotated.  Note that comments may appear anywhere       in the config file as long as the first non-whitespace character on the       line is a #.       The next section of the config files defined how to handle the log file       /var/log/messages. The log will go through five weekly rotations before       being  removed. After the log file has been rotated (but before the old       version of the log has been compressed), the command /sbin/killall -HUP       syslogd will be executed.       The     next     section    defines    the    parameters    for    both       /var/log/httpd/access.log  and  /var/log/httpd/error.log.    They   are       rotated whenever is grows over 100k is size, and the old logs files are       mailed (uncompressed) to www@my.org after going  through  5  rotations,       rather  then being removed. The sharedscripts means that the postrotate       script will only be run once(after the old logs have been  compressed),       not  once  for  each  log which is rotated. Note that the double quotes       around the first filename at  the  beginning  of  this  section  allows       logrotate  to rotate logs with spaces in the name. Normal shell quoting       rules apply, with ’, ", and \ characters supported.       The last section defines  the  parameters  for  all  of  the  files  in       /var/log/news.  Each  file is rotated on a monthly basis.  This is con-       sidered a single rotation directive and if errors occur for  more  then       one file, the log files are not compressed.       Please  use  wildcards  with caution.  If you specify *, logrotate will       rotate all files, including previously rotated ones.  A way around this       is  to  use  the  olddir  directive  or  a more exact wildcard (such as       *.log).       Here is more information on the directives which may be included  in  a       logrotate configuration file:       compress              Old  versions  of log files are compressed with gzip by default.              See also nocompress.       compresscmd              Specifies which command to  use  to  compress  log  files.   The              default is gzip.  See also compress.       uncompresscmd              Specifies  which  command  to  use to uncompress log files.  The              default is gunzip.       compressext              Specifies which extension to use on compressed logfiles, if com-              pression is enabled.  The default follows that of the configured              compression command.       compressoptions              Command line options may be passed to the  compression  program,              if  one is in use.  The default, for gzip, is "-9" (maximum com-              pression).       copy   Make a copy of the log file, but don’t change  the  original  at              all.   This option can be used, for instance, to make a snapshot              of the current log file, or when some  other  utility  needs  to              truncate or pare the file.  When this option is used, the create              option will have no effect, as the old log file stays in  place.       copytruncate              Truncate  the  original log file in place after creating a copy,              instead of moving the old log file and optionally creating a new              one,  It  can be used when some program can not be told to close              its logfile and thus might continue writing (appending)  to  the              previous log file forever.  Note that there is a very small time              slice between copying the file and truncating it, so  some  log-              ging  data  might be lost.  When this option is used, the create              option will have no effect, as the old log file stays in  place.       create mode owner group
    　　　　　　rotation之后立刻创建同名的新日志文件              Immediately after rotation (before the postrotate script is run)              the log file is created (with the same name as the log file just              rotated).   mode  specifies  the  mode for the log file in octal              (the same as chmod(2)), owner specifies the user name  who  will              own  the  log  file,  and group specifies the group the log file              will belong to. Any of the log file attributes may  be  omitted,              in  which  case  those  attributes for the new file will use the              same values as the original log file for the omitted attributes.              This option can be disabled using the nocreate option.       daily  Log files are rotated every day.       delaycompress              Postpone  compression of the previous log file to the next rota-              tion cycle.  This has only effect when used in combination  with              compress.   It  can be used when some program can not be told to              close its logfile and thus might continue writing to the  previ-              ous log file for some time.       extension ext              Log  files  are given the final extension ext after rotation. If              compression is used, the compression  extension  (normally  .gz)              appears after ext.       ifempty              Rotate  the  log  file  even  if  it  is  empty,  overiding  the              notifempty option (ifempty is the default).       include file_or_directory              Reads the file given as an argument as if it was included inline              where  the  include  directive appears. If a directory is given,              most of the files in that directory are read in alphabetic order              before  processing  of  the  including  file continues. The only              files which are ignored are files which are  not  regular  files              (such  as directories and named pipes) and files whose names end              with one of the taboo extensions, as specified by  the  tabooext              directive.  The include directive may not appear inside of a log              file definition.       mail address              When a log is rotated out-of-existence, it is mailed to address.              If  no  mail should be generated by a particular log, the nomail              directive may be used.       mailfirst              When using the mail command, mail the just-rotated file, instead              of the about-to-expire file.       maillast              When  using  the  mail  command,  mail the about-to-expire file,              instead of the just-rotated file (this is the default).       missingok              If the log file is missing, go on to the next one without  issu-              ing an error message. See also nomissingok.       monthly              Log files are rotated the first time logrotate is run in a month              (this is normally on the first day of the month).       nocompress              Old versions of log files are not compressed with gzip. See also              compress.       nocopy Do  not copy the original log file and leave it in place.  (this              overrides the copy option).       nocopytruncate              Do not truncate the original log file in place after creating  a              copy (this overrides the copytruncate option).       nocreate              New  log  files  are  not  created  (this  overrides  the create              option).       nodelaycompress              Do not postpone compression of the previous log file to the next              rotation cycle (this overrides the delaycompress option).       nomail Don’t mail old log files to any address.       nomissingok              If  a  log  file  does  not  exist,  issue an error. This is the              default.       noolddir              Logs are rotated in the same directory the log normally  resides              in (this overrides the olddir option).       nosharedscripts              Run  prerotate  and postrotate scripts for every script which is              rotated (this is the default, and  overrides  the  sharedscripts              option).       notifempty              Do not rotate the log if it is empty (this overrides the ifempty              option).       olddir directory              Logs are moved into directory for rotation. The  directory  must              be  on  the  same physical device as the log file being rotated,              and is assumed to be relative to the directory holding  the  log              file unless an absolute path name is specified. When this option              is used all old versions of the log end up in  directory.   This              option may be overriden by the noolddir option.       postrotate/endscript              The  lines  between postrotate and endscript (both of which must              appear on lines by themselves) are executed after the  log  file              is  rotated.  These  directives  may only appear inside of a log              file definition.  See prerotate as well.       prerotate/endscript              The lines between prerotate and endscript (both  of  which  must              appear  on lines by themselves) are executed before the log file              is rotated and only if the log will actually be  rotated.  These              directives may only appear inside of a log file definition.  See              postrotate as well.       firstaction/endscript              The lines between firstaction and endscript (both of which  must              appear  on lines by themselves) are executed once before all log              files that match the wildcarded pattern are rotated, before pre-              rotate  script is run and only if at least one log will actually              be rotated. These directives may only appear  inside  of  a  log              file definition. See lastaction as well.       lastaction/endscript              The  lines  between lastaction and endscript (both of which must              appear on lines by themselves) are executed once after  all  log              files  that  match  the  wildcarded  pattern  are rotated, after              postrotate script is run  and  only  if  at  least  one  log  is              rotated.  These  directives may only appear inside of a log file              definition. See lastaction as well.       rotate count              Log files are rotated <count>  times  before  being  removed  or              mailed to the address specified in a mail directive. If count is              0, old versions are removed rather then rotated.       size size              Log files are rotated when they grow bigger then size bytes.  If              size  is  followed by M, the size if assumed to be in megabytes.              If the k is used, the size is in kilobytes. So  size  100,  size              100k, and size 100M are all valid.       sharedscripts              Normally,  prescript and postscript scripts are run for each log              which is rotated, meaning that a single script may be run multi-              ple  times for log file entries which match multiple files (such              as the /var/log/news/* example). If sharedscript  is  specified,              the scripts are only run once, no matter how many logs match the              wildcarded pattern.  However, if none of the logs in the pattern              require  rotating,  the  scripts  will  not  be run at all. This              option overrides the nosharedscripts option and  implies  create              option.       start count              This is the number to use as the base for rotation. For example,              if you specify 0, the logs will be created with a  .0  extension              as they are rotated from the original log files.  If you specify              9, log files will be created with a  .9,  skipping  0-8.   Files              will  still  be  rotated  the number of times specified with the              count directive.       tabooext [+] list              The current taboo extension list is  changed  (see  the  include              directive  for information on the taboo extensions). If a + pre-              cedes the list of extensions, the current taboo  extension  list              is  augmented,  otherwise  it is replaced. At startup, the taboo              extension list contains .rpmorig, .rpmsave, ,v,  .swp,  .rpmnew,              and ~.       weekly Log  files  are  rotated if the current weekday is less then the              weekday of the last rotation or if more then a week  has  passed              since  the  last rotation. This is normally the same as rotating              logs on the first day of the week, but it works better if logro-              tate is not run every night.FILES       /var/lib/logrotate.status  Default state file.       /etc/logrotate.conf        Configuration options.SEE ALSO       gzip(1)AUTHORS       Erik Troan <ewt@redhat.com>       Preston Brown <pbrown@redhat.com>4th Berkeley Distribution       Wed Nov 5 2002                    LOGROTATE(8)