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maven project to eclipse java project

steps:

1. download maven project src code
2. cd project root dir & run "mvn eclipse:eclipse"
3. import it as eclipse java prject

step2 will generate .classpath & .project file

posted @ 2012-06-27 15:56 Milo的海域閱讀(824) | 評論 (0) | 編輯收藏

Linux logrotate

1. 配置

2. 命令行選項

選項-d 用來打開debug模式
選項-v 用來打開verbose模式
選項-f 用來打開強制選項，會強制發生log rotate即使不滿足條件

debug模式跟verbose的區別就是: debug模式是dry-run版本的verbose模式，一般用來調試新加的logroate配置文件, 比如：

/usr/sbin/logrotate /etc/logrotate.d/NEWCONFIG -df

/usr/sbin/logrotate /etc/logrotate.d/NEWCONFIG -vf

posted @ 2012-06-26 16:07 Milo的海域閱讀(323) | 評論 (0) | 編輯收藏

Perlvar

Perl里面的predefined vars

perlvar

用perldoc perlvar 可以結合實例來了解更詳細的信息。

下面針對$@寫了個perl alarm的例子

#!/usr/bin/perl

my $timeout = 5;

$SIG{ALRM} = sub {
    die "alarm\n";
};

eval {
    alarm $timeout;
    sleep(6);
    alarm 0;
};

if ($@) {
    print "timeout\n";
}
else {
    print "not timeout\n";
}

posted @ 2012-06-21 17:10 Milo的海域閱讀(321) | 評論 (0) | 編輯收藏

項目依賴分析工具

zane昨天推薦個項目依賴分析的工具: http://www.jboss.org/tattletale

JBoss Tattletale is a tool that can help you get an overview of the project you are working on
or a product that you depend on.

The tool will provide you with reports that can help you

* Identify dependencies between JAR files
* Find missing classes from the classpath
* Spot if a class/package is located in multiple JAR files
* Spot if the same JAR file is located in multiple locations
* With a list of what each JAR file requires and provides
* Verify the SerialVersionUID of a class
* Find similar JAR files that have different version numbers
* Find JAR files without a version number
* Find unused JAR files
* Identify sealed / signed JAR archives
* Locate a class in a JAR file
* Get the OSGi status of your project

使用方法

java -Xmx512m -jar tattletale.jar [-exclude=<excludes>] <scan-directory> [output-directory]

注意事項

tattletale只分析jar包之間的依賴，需要自己把所有的class文件打包放入scan-directory，然后把依賴的lib也放入同個目錄

posted @ 2012-06-13 16:13 Milo的海域閱讀(724) | 評論 (0) | 編輯收藏

Regex quick reference

[abc]     A single character: a, b or c
[^abc]     Any single character but a, b, or c
[a-z]     Any single character in the range a-z
[a-zA-Z]     Any single character in the range a-z or A-Z
^     Start of line
$     End of line
\A     Start of string
\z     End of string
.     Any single character
\s     Any whitespace character
\S     Any non-whitespace character
\d     Any digit
\D     Any non-digit
\w     Any word character (letter, number, underscore)
\W     Any non-word character
\b     Any word boundary character
(

)     Capture everything enclosed
(a|b)     a or b
a?     Zero or one of a
a*     Zero or more of a
a+     One or more of a
a{3}     Exactly 3 of a
a{3,}     3 or more of a
a{3,6}     Between 3 and 6 of a

posted @ 2012-06-13 16:06 Milo的海域閱讀(230) | 評論 (0) | 編輯收藏

Statistics of code line for project

A tool cloc which wrote by perl could help u do that:

http://cloc.sourceforge.net/

prompt> cloc perl-5.10.0.tar.gz
    4076 text files.
    3883 unique files.
    1521 files ignored.

http://cloc.sourceforge.net v 1.50  T=12.0 s (209.2 files/s, 70472.1 lines/s)
-------------------------------------------------------------------------------
Language                     files          blank        comment           code
-------------------------------------------------------------------------------
Perl                          2052         110356         130018         292281
C                              135          18718          22862         140483
C/C++ Header                   147           7650          12093          44042
Bourne Shell                   116           3402           5789          36882
Lisp                             1            684           2242           7515
make                             7            498            473           2044
C++                             10            312            277           2000
XML                             26            231              0           1972
yacc                             2            128             97           1549
YAML                             2              2              0            489
DOS Batch                       11             85             50            322
HTML                             1             19              2             98
-------------------------------------------------------------------------------
SUM:                          2510         142085         173903         529677
-------------------------------------------------------------------------------

Here is command line example:

Usage: cloc-1.56.pl [options] <file(s)/dir(s)> | <set 1> <set 2> | <report files>

posted @ 2012-05-31 15:32 Milo的海域閱讀(312) | 評論 (0) | 編輯收藏

split file to pieces and restore under linux

Sometime mailbox disallows u upload file exceed some limitation. you can split it before upload. here is one example:

create test file

touch file1 file2;
echo 1 > file1;
echo 2 > file2;
tar zvcf old.tar.gz file1 file2;

split file to segment with size as u wished

split -b 50 old.tar.gz;

restore file from segments

cat xa* > new.tar.gz;

verify the restore

md5sum old.tar.gz new.tar.gz

Generally, the check result should be same.

posted @ 2012-05-30 17:38 Milo的海域閱讀(286) | 評論 (0) | 編輯收藏

About cannot core dump after setuid on linux server

In many cases, binaries can no longer dump core after calling setuid(). 
Under Linux it is possible to re-enable this with a system call.

e.g.

+#ifdef __linux__
+#include <sys/prctl.h>
+#endif
+
#ifdef HAVE_purify
#define IF_PURIFY(A,B) (A)
#else
@@ -1362,6 +1366,10 @@
     sql_perror("setuid");
     unireg_abort(1);
   }
+#ifdef __linux__
+  /* inform kernel that process is dumpable */
+  prctl(PR_SET_DUMPABLE,1,0,0,0);
+#endif /* __linux__ */
#endif

Manual of prctl

       PR_SET_DUMPABLE
              (Since Linux 2.4) Set the state of the flag determining whether core dumps are produced for this process  upon  delivery  of  a
              signal  whose  default  behaviour  is  to  produce a core dump.  (Normally this flag is set for a process by default, but it is
              cleared when a set-user-ID or set-group-ID program is executed and also by various system calls that  manipulate  process  UIDs
              and  GIDs).  In kernels up to and including 2.6.12, arg2 must be either 0 (process is not dumpable) or 1 (process is dumpable).
              Since kernel 2.6.13, the value 2 is also permitted; this causes any binary which normally would not  be  dumped  to  be  dumped
              readable by root only.  (See also the description of /proc/sys/fs/suid_dumpable in proc(5).)



Ref: http://bugs.mysql.com/bug.php?id=21723
Some files about linux core dump:

/proc/sys/fs/suid_dumpable
/etc/profile
/etc/security/limits.conf
/proc/sys/kernel/core_pattern

posted @ 2012-05-30 15:32 Milo的海域閱讀(426) | 評論 (0) | 編輯收藏

sysbench 0.5介紹

0.5版本的sysbench已經支持multi-table

Download src code

bzr branch lp:sysbench

make后就可以執行了

Percona對這個版本的sysbench的參數有個不錯的wiki page:
http://www.percona.com/docs/wiki/benchmark:sysbench:olpt.lua

下面這個文章對0.5的sysbench有個比較全面的介紹:

./sysbench --mysql-host=$host1 --mysql-port=3306 --mysql-user=*** --mysql-password=*** --test=/path/to/sysbench/tests/db/oltp.lua --oltp-tables-count=$oltp_table_num --num-threads=$num_thread --max-requests=0 --max-time=$max_time prepare

./sysbench --mysql-host=$host1 --mysql-port=3306 --mysql-user=*** --mysql-password=*** --test=/path/to/sysbench/tests/db/oltp.lua --oltp-tables-count=$oltp_table_num --num-threads=$num_thread --max-requests=0 --max-time=$max_time run

補充下，如果要使用 --max-time這個參數，需要配合--max-requests=0。

--max-requests=N limit for total number of requests [10000]

如果N=0將取消max-requests的限制

posted @ 2012-05-14 16:10 Milo的海域閱讀(817) | 評論 (0) | 編輯收藏

About mysqldump of MySQL 5.5 backup information_schema & performance_schema databases

MySQL 5.5多出了兩個新數據庫 information_schema ＆ performance_schema

但是用mysqldump去備份這兩個數據庫的時候都會報錯

mysqldump: Got error: 1044: Access denied for user 'root'@'localhost' to database 'information_schema' when using LOCK TABLES

mysqldump: Got error: 1142: SELECT,LOCK TABL command denied to user 'root'@'localhost' for table 'cond_instances' when using LOCK TABLES

用--all-databases備份時也不會備份這兩個數據庫
官方文檔里解釋到：

http://dev.mysql.com/doc/refman/5.5/en/mysqldump.html

總結一下，如果一定要用mysqldump去備份這兩個數據庫不是不可以，但是得disable lock tables。我用的是：

--database information_schema --lock-tables=0

posted @ 2012-05-11 14:01 Milo的海域閱讀(1122) | 評論 (1) | 編輯收藏

miaoyachun

maven project to eclipse java project

Linux logrotate

Perlvar

項目依賴分析工具

Regex quick reference

Statistics of code line for project

split file to pieces and restore under linux

About cannot core dump after setuid on linux server

sysbench 0.5介紹

About mysqldump of MySQL 5.5 backup information_schema & performance_schema databases

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