How to change Linux default Java compiler

1. Linux Java default is OpenJDK, I want to change Oracle Java SDK.
2. Download Oracle Java SDK
3. $ /usr/sbin/update-alternatives --install /usr/bin/java java "your download path"/bin/java 99
4. $ /usr/sbin/update-alternatives --config java
5. Choice your Oracle Java SDK.
6. Finish. 

P.S. Red words is command

Gcin 安裝嘸蝦米

1. 首先先上Google搜尋 nosseing，下載相關檔案.
2. 解壓縮後將nosseing.gtab覆製到 /usr/share/gcin/table/
3. 重新開機即可使用無蝦米.

OpenSUSE 13.1 64Bit Install flash player

User just need click this connection. then system will auto-install.

http://software.opensuse.org/package/flash-player

Nyamuk 用法

在 test case 裡面有兩個檔案, pubnya.py, subnya.py

Publish由abc送訊息Hello給ActiveMQ.Advisory.Connection.pin這個Topic: python pubnya.py localhost abc ActiveMQ.Advisory.Connection.pin Hello
Subscript為監聽:python subnya.py localhost test ActiveMQ.Advisory.Connection.pin

Google Compute Engine on Windows tutorial

1. First you need to install Cygwin 32 Bit version.
2. Running install Cygwin you need to install curl, wget, python library.
3. Use Cygwin run command "curl https://dl.google.com/dl/cloudsdk/release/install_google_cloud_sdk.bash | bash" to get fild.
4. Use Cygwin under google-cloud-sdk folder run command  "./install.sh".
5. Certification your account "gcloud auth login"
6. Open browser to Google Developers Console there have connection command.

~Finish~

fail2ban for asterisk tutorial

1. 安裝fail2ban
2. /etc/asterisk/logger.conf 設定

   [general]
   dateformat=%F %T

3. /etc/fail2ban/jail.conf 新增

   [asterisk-iptables]
   # if more than 4 attempts are made within 6 hours, ban for 24 hours
   enabled  = true
   filter   = asterisk
   ignoreip = 168.192.0.1
   action   = iptables-allports[name=ASTERISK, protocol=all]
              sendmail[name=ASTERISK, dest=you@yourmail.co.uk, sender=fail2ban@local.local]
   logpath  = /var/log/asterisk/messages*
   maxretry = 4
   findtime = 21600
   bantime = 86400

4. /etc/fail2ban/filter.d/asterisk.conf 新增下表(給Asterisk 1.8 and Asterisk 11使用)

# Fail2Ban configuration file
#
#
# $Revision: 251 $
#

[INCLUDES]

# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf


[Definition]

#_daemon = asterisk

# Option:  failregex
# Notes.:  regex to match the password failures messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>\S+)
# Values:  TEXT
#
# Asterisk 1.8 uses Host:Port format which is reflected here

failregex = NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Wrong password
           NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - No matching peer found
           NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - No matching peer found
           NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Username/auth name mismatch
           NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Device does not match ACL
           NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Peer is not supposed to register
           NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - ACL error (permit/deny)
           NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Device does not match ACL
           NOTICE.* .*: Registration from '\".*\".*' failed for '<HOST>:.*' - No matching peer found
           NOTICE.* .*: Registration from '\".*\".*' failed for '<HOST>:.*' - Wrong password
           NOTICE.* <HOST> failed to authenticate as '.*'$
           NOTICE.* .*: No registration for peer '.*' \(from <HOST>\)
           NOTICE.* .*: Host <HOST> failed MD5 authentication for '.*' (.*)
           NOTICE.* .*: Failed to authenticate user .*@<HOST>.*
           NOTICE.* .*: <HOST> failed to authenticate as '.*'
           NOTICE.* .*: <HOST> tried  to authenticate with nonexistent user '.*'
           VERBOSE.*SIP/<HOST>-.*Received incoming SIP connection from unknown peer
 
# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =

5. service ufw restart (重啟iptables)
6. service fail2ban restart (重啟fail2ban)

註：ufw 為Ubuntu下重啟iptables指令, 其它版本Linux 應該都是用iptables

驗證
1. iptables -L -n (即可看到被iptables drop掉的IP)
2. fail2ban-client status asterisk-iptables (即可看到fail2ban監控狀態)
3. iptables -D fail2ban-ASTERISK -s 42.78.174.92 -j DROP (不小心4次驗證失敗IP被加到iptables, 將IP從iptables解放出來)

參考文件
1. http://www.fail2ban.org/wiki/index.php/Asterisk
2. http://tc.itkee.com/os/detail-28ad.html
3. http://askubuntu.com/questions/161551/how-to-start-stop-iptables-in-ubuntu-12-04
4. http://pulipuli.blogspot.tw/2011/07/centosfail2ban.html#postcata1389669540911_anchor17

Asterisk stress test, Asterisk壓力測試, Sipp tool

在sip.conf加入

[sipp]

type=friend

context=sipp

host=dynamic

port=6000

user=sipp

canreinvite=no

disallow=all

allow=alaw

在extensions.conf加入

[sipp]

exten => 2005,1,Progress

same => n,Ringing

same => n,Answer

same => n,MusicOnHold(10)

same => n,Hangup

安裝Sipp

sipp -sn uac -d 60000 -i Client位置 -s 2005 Server位置 -l 75