Apache2 setting up the core dump file (DEBIAN7)

Tag: Core dump Apache2

First, the basic Environment 1, release version uname -alinux 10.1.10.117 3.2.0-4-amd64  #1  smp debian 3.2.68-1+ DEB7U1 X86_64 GNU/LINUX2, installing APACHE2APT-GET -Y INSTALL APACHE2-MPM-PREFORK3, Create a directory and give permissions Mkdir /opt/game/core -pchown www-data /opt/game/core/ -r two, open core  Dump function 1, see if Core dump open ulimit -c0ulimit -acore file size            (BLOCKS, -C)  0 parameter Description-c  indicates the size limit of the kernel dump file   0 means it is not turned on core  Dump function   Set the maximum value   unit of the core file in chunks.  -a  Show All current resource limits 2, modify configuration (in kilobytes) cat /etc/security/limits.conf*                 soft    core              2048000*                 hard    core              20480003, effective ulimit -c 20480004, check ulimit - acore file size           (blocks, -c)   2048000ulimit -c2048000 Second, modify the core file save path 1, temporary modification 1) core file saved in/opt/game/core directory echo  "/opt/game/core/%e.core The core file name generated by the.%s.%p.%h.%t " > /proc/sys/kernel/core_pattern2" will become core.pidecho 1 > / Proc/sys/kernel/core_uses_pid2, permanently modify the  1) add 2 lines at the end of the configuration cat /etc/sysctl.confkernel.core_pattern = / OPT/GAME/CORE/%E.CORE.%S.%P.%H.%TKERNEL.CORE_USES_PID = 12) parameter description of the permanent SYSCTL -P3)%e   executable filename  (Without path prefix)                                             #dump的文件名%p   PID of Dumped process, as seen in the pid namespace in which the  process resides   #dump的进程PID%t  time of dump, expressed as  seconds since the Epoch,1970-01-01 00:00:00 +0000      #转储时刻 (number of seconds from January 1, 1970)%h  hostname  (Same as nodename returned by uname (2))                                     #主机名%s   number of signal causing dump                                                         #coredump的信号   Three, apache2 set 1, then/etc/apache2/apache2.conf last add 1 lines cat /etc/ Apache2/apache2.confcoredumpdirectory /opt/game/core2, parameter description syntax:coredumpdirectory  Directory-path This command is used to control the kernel dump directory used by Apache, which is located by default under "ServerRoot". Because this directory is generally not writable for the user running the server, kernel dumps generally do not write content. If you need a kernel dump in debugging, you can use this command to specify a different directory. 3, restart Apache2 service/etc/init.d/apache2 restart4, kill apache2 process First view the next apache2 process root        2342  0.0  1.2  71568  2916 ?         Ss   02:29   0:00 /usr/sbin/apache2 -k  startwww-data   2344  0.0  0.8  71592  2132 ?         s    02:29   0:00 /usr /sbin/apache2 -k startwww-data   2345  0.0  0.8  71592   2132 ?        s    02:29   0:00 /usr/ sbin/apache2 -k startwww-data   2348  0.0  0.8  71592   2132 ?        S    02:29    0:00 /usr/sbin/apache2 -k startwww-data   2349  0.0   0.8  71592  2132 ?        S     02:29   0:00 /usr/sbin/apache2 -k startwww-data    2350  0.0  0.8  71592  2132 ?         s    02:29   0:00 /usr/sbin/apache2 -k startkill  -11 2342kill -11 2344kill -11 2345kill -11 2348kill -11  2349kill -11 2350 Signal 11 Description One)  SIGSEGV  attempts to access memory that is not assigned to itself,  or attempts to write data to a memory address that does not have write permission. 5, see that there is already a core produced ll /opt/game/core/- RW------- 1 root     root     2596864 may  21 02:38 APACHE2.CORE.11.2342.10.1.10.117.1432190336-RW------- 1 www-data  WWW-DATA 2621440 MAY 21 02:38 APACHE2.CORE.11.2344.10.1.10.117.1432190338-RW-------  1 www-data www-data 2621440 May 21 02:38  APACHE2.CORE.11.2345.10.1.10.117.1432190339-RW------- 1 www-data www-data 2621440 may  21 02:39 APACHE2.CORE.11.2348.10.1.10.117.1432190344-RW------- 1 www-data  WWW-DATA 2621440 MAY 21 02:39 APACHE2.CORE.11.2349.10.1.10.117.1432190346-RW-------  1 www-data www-data 2621440 May 21 02:39  apache2.core.11.2350.10.1.10.117.14321903496, using GDB program 1) First install Gdbapt-get -y instALL GDB2) Use the GDB program to view gdb apache2 -core /opt/game/core/ apache2.core.11.2342.10.1.10.117.1432190336gnu gdb  (GDB)  7.4.1-debianCopyright  (C)   2012 free software foundation, inc.license gplv3+: gnu gpl version  3 or later 

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Apache2 setting up the core dump file (DEBIAN7)