A blog by a system administrator and programmer.

compile error of subversion 
Thursday, December 20, 2007, 06:27 PM - System
Posted by Freddy Chu
This problem usually exist in solaris 5.7

libtool[4766]: : is not an identifier
make: *** [subversion/svn/svn] Segmentation Fault. (core dumped)


Many people suggested to compile it as static link, then the problem will be solved. I have tried but without success. So that i start debug the compile code, lastly i found the problem is caused by ksh.

Solution:

1. do configure as usual
2. replace all ksh to bash or sh in Makefiles and libtool
3. make


P.S. becareful of compile neon, db4, openssl, expat, apr, apr-util for solaris. It seems that gcc < 3.0 have some bugs in solaris system, you better compile them with shared flags
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Compiler error in Solaris 
Monday, December 10, 2007, 10:36 PM - System
Posted by Freddy Chu
These days I have facing an error during compile DB4 in solaris 5.7.

when I am doing configure It shows
configure: error: C compiler cannot create executables


Here is the error in config.log.
configure:3855: found /usr/ucb/cc
configure:3866: result: cc
configure:3902: checking for C compiler version
configure:3909: cc --version >&5
/usr/ucb/cc: language optional software package not installed
configure:3912: $? = 1
configure:3919: cc -v >&5
/usr/ucb/cc: language optional software package not installed
configure:3922: $? = 1
configure:3929: cc -V >&5
/usr/ucb/cc: language optional software package not installed
configure:3932: $? = 1
configure:3955: checking for C compiler default output file name
configure:3982: cc -O -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS conftest.c >&5
/usr/ucb/cc: language optional software package not installed


I have googled for sometime but seems no any solutions. >"<

But suddently I think about tricky way. Changed the compiler

so that i export CC=gcc

It works lucky.

Do anybody know another way?
10 comments ( 126 views )   |  permalink   |   ( 3 / 2690 )
syslog-ng concurrent connections exceeded 
Monday, November 19, 2007, 10:59 AM - System
Posted by Freddy Chu
These days I get a very funny warning in the syslog.

syslog-ng[4484]: Number of allowed concurrent connections exceeded; num='10', max='10'


I have googled it for a while, it seems is the default values of syslog-ng limited the concurrent connections of any stream device to 10.

It can simply sloved by increase the limit.

in syslog-ng.conf

unix-stream("/dev/log" max-connections(20));


7 comments ( 77 views )   |  permalink   |   ( 3 / 2510 )
Simple MySQL Replication HOWTO 
Thursday, November 1, 2007, 06:10 PM - System
Posted by Freddy Chu

Requirements:



* Slave server should be newer version than the master server. It is adviced that both servers are in same version
* Network port 3306 of both server should be avaliable
* log-bin is enabled


Procedure



1. edit my.cnf to add log-bin and server-id, server-id should be unique and from 1 to 2^32 - 1.
[mysqld]
server-id = 1
log-bin


2. restart the mysql server both server if you have do many modification in step 1

3. create replicate user, if you are using MySQL before 4.0.2 replace "REPLICATION SLAVE" by "FILE"
GRANT REPLICATION SLAVE ON *.* TO 'Username'@'Host' IDENTIFIED BY 'password';


4. lock all tables on master server

mysql> FLUSH TABLES WITH READ LOCK;


5. Copy all mysql files to the slave server

6. At master server run show master status, remember the file and position info

mysql> SHOW MASTER STATUS;
+--------------+----------+--------------+------------------+
| File | Position | Binlog_do_db | Binlog_ignore_db |
+--------------+----------+--------------+------------------+
| log-bin.002 | 189 | | |
+--------------+----------+--------------+------------------+


7. At slave server run change master to use the account create in step 3 and info in step 6
CHANGE MASTER TO
MASTER_HOST='master_server_ip',
MASTER_USER='slave_user_name',
MASTER_PASSWORD='slave_password',
MASTER_LOG_FILE='file_in_step_7',MASTER_LOG_POS=position_in_step_7;


8. run Slave start

9. unlock tables on master server

mysql>UNLOCK TABLES;



Now you will have a replicate MySQL server, just test to modify any records. :D
9 comments ( 91 views )   |  permalink   |   ( 3 / 2425 )
Mysql problems 
Saturday, October 27, 2007, 06:05 PM - System
Posted by Freddy Chu
Get Error 1033 "Incorrect information in file xxxx.frm" when run REPAIR

* Found a backup frm file if you can and overwrite the existing one
* If you do not have frm backup, you may need to find the original "create table" statement

1. Backup those table's frm, MYI, MYD first
2. use the original create table statement to create a new table with another name
3. overwrite the table's frm with the new table's frm
4. run REPAIR TABLE again



mysqldump: Got error: 1105: not found (Errcode: 24) when using LOCK TABLES

* this happens usually caused by open_files_limit too low
* edit my.cnf at [mysqld]" part

[mysqld]
open_files_limit = 8192


* restart mysql server
9 comments ( 77 views )   |  permalink   |   ( 3 / 2385 )

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