linux – logrotate不压缩/ var / log / messages

发布时间：2020-05-23 22:15:13 所属栏目：Linux 来源：互联网

导读：随着时间的推移,我注意到/ var / log中的一些日志,如auth,kern和消息变得越来越大.我为他们制作了logrotate条目： $cat /etc/logrotate.d/auth.log /var/log/kern.log { rotate 5 daily}$cat /etc/logrotate.d/kern.log /var/log/kern.log {

随着时间的推移,我注意到/ var / log中的一些日志,如auth,kern和消息变得越来越大.我为他们制作了logrotate条目：

$cat /etc/logrotate.d/auth.log 
/var/log/kern.log {
    rotate 5
    daily
}
$cat /etc/logrotate.d/kern.log 
/var/log/kern.log {
    rotate 5
    daily
}
$cat /etc/logrotate.d/messages 
/var/log/messages {
    rotate 5
    daily
    postrotate
        /bin/killall -HUP syslogd
    endscript
}

我也启用了压缩选项：

$grep compress /etc/logrotate.conf 
# uncomment this if you want your log files compressed
compress

这适用于auth.log,kern.log和其他日志,这意味着每个日志都经过gzip压缩和旋转,并保留最后5天的日志.然而,/ var / log / messages没有被压缩,导致超过5天的日志：

$ls /var/log/messages*
/var/log/messages           /var/log/messages-20100213
/var/log/messages-20100201  /var/log/messages-20100214
/var/log/messages-20100202  /var/log/messages-20100215
/var/log/messages-20100203  /var/log/messages-20100216
/var/log/messages-20100204  /var/log/messages-20100217
/var/log/messages-20100205  /var/log/messages-20100218
/var/log/messages-20100206  /var/log/messages-20100219
/var/log/messages-20100207  /var/log/messages-20100220
/var/log/messages-20100208  /var/log/messages-20100221
/var/log/messages-20100209  /var/log/messages-20100222
/var/log/messages-20100210  /var/log/messages-20100223
/var/log/messages-20100211  /var/log/messages-20100224
/var/log/messages-20100212

如another logrotate question on ServerFault中所述,旧日志(很可能)未被删除,因为每个文件的文件结尾不同.这似乎是因为文件没有被gzip压缩.

如果保留/ var / log / messages与最后5天的日志一样,我可以做什么,就像我的所有其他日志文件一样？我错过了什么？

编辑1：前几个答案中要求的其他信息.

我正在运行Gentoo Linux.我的/etc/logrotate.conf文件：

$cat /etc/logrotate.conf 
# $Header: /var/cvsroot/gentoo-x86/app-admin/logrotate/files/logrotate.conf,v 1.3 2008/12/24 20:49:10 dang Exp $
#
# Logrotate default configuration file for Gentoo Linux
#
# See "man logrotate" for details
# rotate log files weekly
weekly
#daily
# keep 4 weeks worth of backlogs
rotate 4
# create new (empty) log files after rotating old ones
create
# use date as a suffix of the rotated file
dateext
# uncomment this if you want your log files compressed
compress
# packages can drop log rotation information into this directory
include /etc/logrotate.d
notifempty
nomail
noolddir
# no packages own lastlog or wtmp -- we'll rotate them here
/var/log/wtmp {
    monthly
    create 0664 root utmp
    rotate 1
}
/var/log/btmp {
    missingok
    monthly
    create 0600 root utmp
    rotate 1
}

/etc/logrotate.d包含我上面提到的自定义配置文件以及这些包安装的mysql,rsync等配置.

我的root crontab是空的：

$sudo crontab -l
no crontab for root

我检查了所有/etc/cron.{daily,hourly,monthly,weekly}以查找与syslog相关的内容,并且有一个旋转/ var / log / syslog和/var/log/auth.log的脚本.

接下来,我按照CarpeNoctem的建议制作了一个/ var / log / messages-only logrotate配置文件：

$cat logrotate-messages 
weekly
rotate 4
create
dateext
compress
notifempty
nomail
noolddir
/var/log/messages {
    rotate 5
    daily
    postrotate
        /bin/killall -HUP syslogd
    endscript
}

然后我手动运行logrotate：

$logrotate -d logrotate-messages -f
reading config file logrotate-messages
reading config info for /var/log/messages 

Handling 1 logs

rotating pattern: /var/log/messages  forced from command line (5 rotations)
empty log files are not rotated,old logs are removed
considering log /var/log/messages
  log needs rotating
rotating log /var/log/messages,log->rotateCount is 5
dateext suffix '-20100224'
glob pattern '-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'
glob finding old rotated logs failed
renaming /var/log/messages to /var/log/messages-20100224
creating new /var/log/messages mode = 0644 uid = 0 gid = 0
running postrotate script
running script with arg /var/log/messages : "
        /bin/killall -HUP syslogd
"
compressing log with: /bin/gzip
$which gzip
/bin/gzip
$file /bin/gzip
/bin/gzip: ELF 32-bit LSB executable,Intel 80386,version 1 (SYSV),dynamically linked (uses shared libs),for GNU/Linux 2.6.9,stripped

根据上面的日志,logrotate使用/ bin / gzip压缩日志,但我没有在/ var / log中看到压缩消息文件.此外,旧旋转文件的globbing失败.

编辑2：在将旧的/ var / log / message- *文件附加.gz后缀后添加logrotate运行的调试输出.

我们从：

$ls /var/log/messages*
/var/log/messages              /var/log/messages-20100222.gz
/var/log/messages-20100219.gz  /var/log/messages-20100223.gz
/var/log/messages-20100220.gz  /var/log/messages-20100224.gz
/var/log/messages-20100221.gz

然后使用我们的自定义配置文件运行logrotate：

$logrotate -d logrotate-messages -f
reading config file logrotate-messages
reading config info for /var/log/messages 

Handling 1 logs

rotating pattern: /var/log/messages  forced from command line (5 rotations)
empty log files are not rotated,log->rotateCount is 5
dateext suffix '-20100224'
glob pattern '-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'
removing /var/log/messages-20100219.gz
removing old log /var/log/messages-20100219.gz
destination /var/log/messages-20100224.gz already exists,skipping rotation

这次,logrotate的glob成功并找到第六个压缩日志文件,打算将其删除.该文件实际上没有删除;我猜那是因为我们在调试模式下运行.

我很好奇是否为/ var / log / messages启用delaycompress选项会有所帮助.我启用了它,并将在第二天早上检查结果.

解决方法

将delaycompress添加到/ var / log / messages的配置部分解决了这个问题.

来自man logrotate：

delaycompress Postpone compression of the previous log file to the next rota

（编辑：安卓应用网）

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