Walkmen Network

This is all about IT solution of Walkmen Network

While moving the Debian 8.2 postfix email server with MailScanner installed to virtual machine environment, there is some limitation on its processing power. It happened that the MailScanner cannot process too many email at the same time, as a result, error messages such as “Denial of Service attack in message!” start appearing. e-mails were being [...]

ProFTPD killed suddenly after a day

The ProFTPD is killed quit frequently every night. Dec 03 23:59:02 www.walkmen.net proftpd[xxxxx] localhost: ProFTPD killed (signal 15) Dec 03 23:59:02 www.walkmen.net proftpd[xxxxx] localhost: ProFTPD x.y.z standalone mode SHUTDOWN This is happened to be a bug when stopping ProFTPD too fast. The way to fix it is to modify the /etc/init.d/proftpd script and change every [...]

Reset MySQL Binary Logs

In short, you may find mysqld-bin.xxxxxx files wasting your disk space while you don’t know what are they used for. It is “safe” to remove this binary logs file by executing the following commands after login your MySQL server: db:~# mysql -uroot -p Enter password: mysql> FLUSH LOGS; mysql> RESET MASTER;

Mailbox mbox format to maildir

It is actually quite easy to convert from mbox format to maildir format. Fire an command “mb2md” can save you tons of works.

Debian has released etch (4.0)

Important XServer package updated include XOrg 7.1 with Compiz which is OpenGL acceleration engine. Important Server packages updated include Apache 2.2 , MySQL 5.0, OpenSSH 4.3 , Bind9.3

Rebuild Debian package

As requested by a client, I need installing both php5 and php4 in my debian based server. To switch between php versions, suphp can do the job. However the pre-built package by debian team cannot be use directly, I edited, recompiled and packaged suphp before use. I noted the procedure of rebuilding the suphp package here. developer@dev:/tmp/rebuild$ apt-get source libapache2-mod-suphp [...]

Postfix extends Message Size

You may encounter message too large on default postfix configuration. You can check your default limit by ‘postconf -d | grep message_size_limit’ The original message was received at Sat, 3 Mar 2007 12:47:00 +0800 (EAT) from [xxx.xxx.xxx] —– The following addresses had permanent fatal errors —– <info_AT_walkmen.net> (reason: 552 Error: message too large) —– Transcript [...]

Postfix TLS Suppport

Following the tutorial in “The Perfect Setup – Debian Sarge (3.1)” http://www.howtoforge.com/perfect_setup_debian_sarge To add TLS support in Postfix, simply add the following lines to /etc/postfix/master.cf smtps inet n – - – - smtpd -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes