Lani's Study Books

最近因為Mail server 使用NFS方式 mount nas ，
但是一直因為NFS server file lock，造成NFS client cyrus ioerror：
IOERROR: locking header for user.lani: Operation not supported

NFS Server and NFS Client OS 皆是FreeBSD
為了解此問題，所以查詢了一下NFS man page.

其實Frebsd NFS 針對 locking 說明：

If real locking between the NFS clients and NFS server is not required, it is possible to let the NFS client do locking locally by passing -L to mount_nfs(8). Refer to the mount_nfs(8) manual page for further details.

參考資料：
FreeBSD mount NFS file systems
mount_nfs -- mount NFS file systems
Red Hat Enterprise Linux Reference Guide Network File System

基本設定可參考此說明：
http://turtle.ee.ncku.edu.tw/~ac/FreeBSD/50_NFS/nfs.html
http://mgtcc.mgt.ncu.edu.tw/faq_in.php?op=Linux&oop=NFS.htm

將 big5 的文字檔轉換為 utf8 的文字檔

Usage: iconv [-c] [-s] [-f fromcode] [-t tocode] [file ...]
or: iconv -l

iconv -l ：顯示支援的字形

iconv -f BIG5 -t UTF-8 big5.txt > utf8.txt

The rewrite flag ``S'' specifies a rewrite of incoming envelope addresses at SMTP time, as soon as an address is received in a MAIL or RCPT command, and before any other processing

參考資料：
31.8. Flags specifying which headers and envelope addresses to rewrite
31.9. The SMTP-time rewriting flag

######################################################################
# REWRITE CONFIGURATION #
######################################################################

參數如下：
begin rewrite

\N^(.*)@(.*)$\N "${lookup mysql {SELECT pridomain FROM multidomaindb WHERE secdomain='$2'}{$1@$value}fail}" SE

S The SMTP-time rewriting flag
E rewrite all envelope fields

建構想法：
1、不影嚮原主機架構
2、快速建置符合需求
3、決定使用rewrite方式

新增一個資料表 multidomain，新增兩欄位 Pridomain & Secdomain。

Pridomain：為主要Domain
Secdomain：為次要Domain 或第三筆、第四筆Domain

修改 Exim configure rewrite 區
######################################################################
# REWRITE CONFIGURATION #
######################################################################

參數如下：
begin rewrite
*@* "${lookup mysql {SELECT pridomain FROM multidomaindb WHERE secdomain='$2'}{$1@$value}fail}" Tbct

其中使用到 Tbct 表示意義如下：
T rewrite the envelope To field
b rewrite the Bcc: header
c rewrite the Cc: header
t rewrite the To: header

參數用意：
將進來的emailaddress，凡有第二筆Domain以上，皆置換為主要Domain後，送往後端主機。

測試結論，rewrite 在acl check之後，所以必須克服此問題。

# rabid:

./rabid
Usage: rabid [-r max-connections-per-minute] [-p processes] [-l local-address]
[-c messages-per-connection] [-a] [-i imap-percentage]
[-s ssl-percentage] [-d download-percentage[:delete-percentage]]
[-[z|Z] debug-file]
pop-server user-list-filename conversion-filename

./rabid -r 400 -c 100 127.0.0.1 users loqueseael
fichero users lo creareemos con: echo “username@oio.idv.tw password”

# postal:

./postal
Usage: postal [-m maximum-message-size] [-p processes] [-l local-address]
[-c messages-per-connection] [-r messages-per-minute] [-a]
[-b [no]netscape] [-[z|Z] debug-file]
[-s ssl-percentage]
smtp-server user-list-filename conversion-filename