Tomcat 空间占用增长异常分析一例
作者:Fenng
出处:http://www.dbanotes.net
日期:January 12, 2005
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有朋友问：
RHEL AS 3.0 上，df -k发现 /opt 在不断增长，而在 /home 里面 du -sh 却发现空间大小没有变化， /opt 下面是一个网站，把 tomcat 停了就不会增长了。这是怎么回事?
第一个感觉以为是 df 和 du 这两个命令显示的有差异。没错，的确有差异。但是，现在的主要问题是 df -k 命令显示的空间在增长。分析研究了 /proc 下相关进程对应的目录下的信息，未发现异常。图劳无功。
猜测tomcat 打开了某些文件描述符，虽然文件已经修改了，但是文件描述符如果没有关闭的话，一样会占用空间甚至增大空间的占用。用 lsof(LiSt Opened File) 进行分析。
注：对一些特定的路径进行了一点处理。首先获取/opt 对应的设备名字。
# lsof /dev/sdb2 | sort +6nr | head -5 java 21247 root 1w REG 104,6 96538188 917506 /opt/tomcat/logs/catalina.out (deleted) java 21247 root 2w REG 104,6 96538188 917506 /opt/tomcat/logs/catalina.out (deleted) java 21247 root mem REG 104,6 1394764 901145 /opt/tomcat/common/lib/nls_charset12.jar java 21247 root mem REG 104,6 1394295 901143 /opt/tomcat/common/lib/nls_charset11.jar java 21247 root mem REG 104,6 1159907 901140 /opt/tomcat/common/lib/classes12dms.jar [root@stat root]#
经确认，/opt/tomcat/logs/catalina.out (deleted) 项占用的空间在疯狂增长。建议跟踪该文件的变化。
# tail -f /opt/tomcat/logs/catalina.out java.net.UnknownHostException: auto at java.net.InetAddress.getAllByName0(InetAddress.java:1016) at java.net.InetAddress.getAllByName0(InetAddress.java:981) at java.net.InetAddress.getAllByName(InetAddress.java:975) at java.net.InetAddress.getByName(InetAddress.java:889) org.apache.catalina.cluster.mcast.McastMember.getData(McastMember.jav a:122) at org.apache.catalina.cluster.mcast.McastServiceImpl.send(McastServiceI mpl.java:221) at org.apache.catalina.cluster.mcast.McastServiceImpl$SenderThread.run(M castServiceImpl.java:259)
注意到
java.net.InetAddress.getAllByName0(InetAddress.java:1016
测试可能是 Tomcat 的 Bug,把 java.net.InetAddress.getAllByName0(InetAddress.java:1016 作为搜索短语查找一下，果不其然：
http://issues.apache.org/bugzilla/show_bug.cgi?id=27259附: LSOF: QUICK START
Posted by Fenng at January 12, 2005 02:04 PM
Last updated at 06:21 PM on August 20, 2005
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Comments
附件打不开阿？为什么在 /home下du，而不是/opt下 du呢
Posted by: nlany at April 30, 2005 09:32 AM
LSOF: QUICK START 用Google搜索一下吧
Home 下du 作为参考的
Posted by: Fenng at May 3, 2005 03:47 PM