设置 core dump文件名的格式

可以在/etc/sysctl.conf里设置。

 cat sysctl.conf kernel.core_pattern =%e.core.%pkernel.core_uses_pid = 0

%e: 可执行文件名

%p: 进程的PID

%u: real uid of the process

%g: real gid of the process

%t: the time when the core is dumped

%h: host name

%c: the max size of the core dump file

在上面的设置下，如果一个名为 test的程序产生了core dump, 则他的名字为 test.core.123 (这里假设其pid为  123）

如果在 sysctl.conf里改变了设置，之后要执行 sysctl -p 使之生效。

设置生成压缩的 core文件

首先，创建文件 core_helper：

#cat usr/sbin/core_helper #!/bin/shexec gzip - > /root/$1.core.$2.gz

修改 sysctl.conf文件内容：

#cat etc/sysctl.conf kernel.core_pattern = |/usr/sbin/core_helper %e %p kernel.core_uses_pid = 0

#cat /proc/sys/kernel/core_pattern |/usr/sbin/core_helper %e %p

重新执行  sysctl -p 之后，就会生成  test.core.1234.gz 这样的文件。

man core 里有对于这个管道符号的解释：

      Since  kernel  2.6.19,  Linux  supports  an  alternate  syntax  for the       /proc/sys/kernel/core_pattern file.  If the  first  character  of  this       file  is  a  pipe  symbol (|), then the remainder of the line is inter‐       preted as a program to be executed.  Instead of being written to a disk       file,  the  core  dump is given as standard input to the program.  Note       the following points:       *  The program must be specified using an absolute pathname (or a path‐          name relative to the root directory, /), and must immediately follow          the '|' character.       *  The process created to run the program runs as user and group root.       *  Command-line arguments can be supplied to the program (since  kernel          2.6.24),  delimited by white space (up to a total line length of 128          bytes).       *  The command-line arguments can  include  any  of  the  %  specifiers          listed  above.   For example, to pass the PID of the process that is          being dumped, specify %p in an argument.