java.net.SocketException: Too many open files问题分析及解决方案

来源：互联网发布：大小非农数据公布时间编辑：程序博客网时间：2024/06/05 04:10

原文链接：http://www.javaarch.net/jiagoushi/626.htm

java web应用在执行一段时间之后出现了这么个问题

java.net.SocketException: Too many open filesat java.net.PlainSocketImpl.socketAccept(Native Method)at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)at java.net.ServerSocket.implAccept(ServerSocket.java:453)at java.net.ServerSocket.accept(ServerSocket.java:421)at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:60)at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:216)

用ulimit -a看看linux打开文件限制

[admin@test ~]# ulimit -acore file size          (blocks, -c) 0data seg size           (kbytes, -d) unlimitedscheduling priority             (-e) 0file size               (blocks, -f) unlimitedpending signals                 (-i) 360448max locked memory       (kbytes, -l) 32max memory size         (kbytes, -m) unlimitedopen files                      (-n) 1024pipe size            (512 bytes, -p) 8POSIX message queues     (bytes, -q) 819200real-time priority              (-r) 0stack size              (kbytes, -s) 10240cpu time               (seconds, -t) unlimitedmax user processes              (-u) 360448virtual memory          (kbytes, -v) unlimitedfile locks                      (-x) unlimited

用lsof -p [进程ID] 可以看到某ID的打开文件状况。进程ID可能用 ps -ef|grep java列出

[admin@test ~]# lsof -p 1940COMMAND  PID USER   FD   TYPE             DEVICE     SIZE      NODE NAMEjava    1940 admin  cwd    DIR               0,68     4096 385090717 /admin/apache-tomcat-7.0.39/binjava    1940 admin  rtd    DIR               0,68     4096 384141801 /java    1940 admin  txt    REG               0,68    47308 385122308 /admin/jdk1.6.0_13/jre/bin/javajava    1940 admin  mem    REG              202,3          385122339 /admin/jdk1.6.0_13/jre/lib/i386/client/libjvm.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122308 /admin/jdk1.6.0_13/jre/bin/java (path dev=0,68)java    1940 admin  mem    REG              202,3          385122425 /admin/jdk1.6.0_13/jre/lib/i386/client/classes.jsa (path dev=0,68)java    1940 admin  mem    REG              202,3          385122426 /admin/jdk1.6.0_13/jre/lib/charsets.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          384959153 /lib/libresolv-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          384959143 /lib/libnss_dns-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122355 /admin/jdk1.6.0_13/jre/lib/i386/libnio.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122354 /admin/jdk1.6.0_13/jre/lib/i386/libnet.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122325 /admin/jdk1.6.0_13/jre/lib/ext/sunjce_provider.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385122326 /admin/jdk1.6.0_13/jre/lib/ext/sunpkcs11.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385122392 /admin/jdk1.6.0_13/jre/lib/jce.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385122405 /admin/jdk1.6.0_13/jre/lib/resources.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385122391 /admin/jdk1.6.0_13/jre/lib/jsse.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090820 /admin/apache-tomcat-7.0.39/lib/tomcat-dbcp.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090824 /admin/apache-tomcat-7.0.39/lib/tomcat-jdbc.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090821 /admin/apache-tomcat-7.0.39/lib/tomcat-i18n-es.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090816 /admin/apache-tomcat-7.0.39/lib/jsp-api.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090817 /admin/apache-tomcat-7.0.39/lib/servlet-api.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090813 /admin/apache-tomcat-7.0.39/lib/el-api.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090811 /admin/apache-tomcat-7.0.39/lib/catalina.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090812 /admin/apache-tomcat-7.0.39/lib/ecj-4.2.1.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090819 /admin/apache-tomcat-7.0.39/lib/tomcat-coyote.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385122356 /admin/jdk1.6.0_13/jre/lib/i386/libmanagement.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122440 /admin/jdk1.6.0_13/jre/lib/rt.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          384500332 /usr/lib/locale/locale-archive-rpm (path dev=0,68)java    1940 admin  mem    REG              202,3          385122427 /admin/jdk1.6.0_13/jre/lib/ext/localedata.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090825 /admin/apache-tomcat-7.0.39/lib/tomcat-util.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090807 /admin/apache-tomcat-7.0.39/lib/annotations-api.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090815 /admin/apache-tomcat-7.0.39/lib/jasper.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090818 /admin/apache-tomcat-7.0.39/lib/tomcat-api.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090809 /admin/apache-tomcat-7.0.39/lib/catalina-ha.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090814 /admin/apache-tomcat-7.0.39/lib/jasper-el.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090810 /admin/apache-tomcat-7.0.39/lib/catalina-tribes.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090823 /admin/apache-tomcat-7.0.39/lib/tomcat-i18n-ja.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090822 /admin/apache-tomcat-7.0.39/lib/tomcat-i18n-fr.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090808 /admin/apache-tomcat-7.0.39/lib/catalina-ant.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090794 /admin/apache-tomcat-7.0.39/bin/tomcat-juli.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090781 /admin/apache-tomcat-7.0.39/bin/commons-daemon.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385090776 /admin/apache-tomcat-7.0.39/bin/bootstrap.jar (path dev=0,68)java    1940 admin  mem    REG              202,3          385122350 /admin/jdk1.6.0_13/jre/lib/i386/libzip.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122346 /admin/jdk1.6.0_13/jre/lib/i386/libjava.so (path dev=0,68)java    1940 admin  mem    REG              202,3          384959101 /lib/libnss_files-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122345 /admin/jdk1.6.0_13/jre/lib/i386/libverify.so (path dev=0,68)java    1940 admin  mem    REG              202,3          384959147 /lib/libnsl-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385222531 /tmp/hsperfdata_admin/1940 (path dev=0,68)java    1940 admin  mem    REG              202,3          384959158 /lib/librt-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          384959112 /lib/libm-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          384959123 /lib/libc-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          384958823 /lib/libdl-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122348 /admin/jdk1.6.0_13/jre/lib/i386/jli/libjli.so (path dev=0,68)java    1940 admin  mem    REG              202,3          384959167 /lib/libpthread-2.12.so (path dev=0,68)java    1940 admin  mem    REG              202,3          385122332 /admin/jdk1.6.0_13/jre/lib/i386/native_threads/libhpi.so (path dev=0,68)java    1940 admin  mem    REG              202,3          384959214 /lib/ld-2.12.so (path dev=0,68)java    1940 admin    0r   CHR                1,3          384926820 /dev/nulljava    1940 admin    1w   REG               0,68 26134081 385090804 /admin/apache-tomcat-7.0.39/logs/catalina.outjava    1940 admin    2w   REG               0,68 26134081 385090804 /admin/apache-tomcat-7.0.39/logs/catalina.outjava    1940 admin    3r   REG               0,68    28615 385090776 /admin/apache-tomcat-7.0.39/bin/bootstrap.jarjava    1940 admin    4r   CHR                1,8          384926869 /dev/randomjava    1940 admin    5r   CHR                1,9          384926888 /dev/urandomjava    1940 admin    6r   REG               0,68    24281 385090781 /admin/apache-tomcat-7.0.39/bin/commons-daemon.jarjava    1940 admin    7r   REG               0,68    38161 385090794 /admin/apache-tomcat-7.0.39/bin/tomcat-juli.jarjava    1940 admin    8r   REG               0,68 51139867 385122440 /admin/jdk1.6.0_13/jre/lib/rt.jarjava    1940 admin    9w   REG               0,68    23357 385090941 /admin/apache-tomcat-7.0.39/logs/catalina.2013-05-29.logjava    1940 admin   10w   REG               0,68     6736 385090942 /admin/apache-tomcat-7.0.39/logs/localhost.2013-05-29.logjava    1940 admin   11w   REG               0,68        0 385090943 /admin/apache-tomcat-7.0.39/logs/manager.2013-05-29.logjava    1940 admin   12w   REG               0,68        0 385090944 /admin/apache-tomcat-7.0.39/logs/host-manager.2013-05-29.logjava    1940 admin   13r   REG               0,68    54176 385090808 /admin/apache-tomcat-7.0.39/lib/catalina-ant.jarjava    1940 admin   14r   REG               0,68    48693 385090822 /admin/apache-tomcat-7.0.39/lib/tomcat-i18n-fr.jarjava    1940 admin   15r   REG               0,68    51678 385090823 /admin/apache-tomcat-7.0.39/lib/tomcat-i18n-ja.jarjava    1940 admin   34r   REG               0,68   618621 385122391 /admin/jdk1.6.0_13/jre/lib/jsse.jarjava    1940 admin   35r   REG               0,68    88256 385122392 /admin/jdk1.6.0_13/jre/lib/jce.jarjava    1940 admin   36r   REG               0,68   226069 385122326 /admin/jdk1.6.0_13/jre/lib/ext/sunpkcs11.jarjava    1940 admin   37r   REG               0,68   170239 385122325 /admin/jdk1.6.0_13/jre/lib/ext/sunjce_provider.jarjava    1940 admin   38u  IPv6          221130420                TCP *:http (LISTEN)java    1940 admin   39u  sock                0,5          221130418 can't identify protocoljava    1940 admin   40u  IPv6          221130421                TCP *:8009 (LISTEN)java    1940 admin   41w   REG               0,68    15006 385090940 /admin/apache-tomcat-7.0.39/logs/localhost_access_log.2013-05-29.txtjava    1940 admin   42u  IPv6          221137418                TCP localhost.localdomain:41285->localhost.localdomain:mysql (ESTABLISHED)java    1940 admin   44u  IPv6          221132667                TCP localhost.localdomain:mxi (LISTEN)java    1940 admin   46r   REG               0,68   311856 384278348 (deleted) /admin/data/_2pb.tisjava    1940 admin   47r   REG               0,68   148741 384278362 (deleted) /admin/data/_2pb.frqjava    1940 admin   48r   REG               0,68   311842 384277396 (deleted) /admin/data/_2pc.tisjava    1940 admin   87w   REG               0,68     4355 388497409 /logs/run.logjava    1940 admin  110r   CHR                1,8          384926869 /dev/randomjava    1940 admin  111r   REG               0,68   311856 384278348 (deleted) /admin/data/_2pb.tisjava    1940 admin  112u  unix 0xffff88045ea3b9c0          221132407 socket

ulimit -n 4096 临时把打开文件数的上限设为了4096

如果要永久生效，可以通过下面的方式设置。

修改/etc/security/limits.conf 添加如下一行：

* - nofile 1006154

修改/etc/pam.d/login添加如下一行

session required /lib/security/pam_limits.sojava.net.SocketException: Too many open files问题分析及解决方案