Ascii hex (IEEE754) 轉成 flaot in python

import sys
form binascii import unhexlify
s = unhexlify(sys.argv[1]) + unhexlify(sys.argv[2]) \
+ unhexlify(sys.argv[3]) + unhexlify(sys.argv[4])
import struct
result = struct.unpack_from('f', s)
print result[0]

Route setting under multi interfaces

The GATEWAY setting in ifcfg-eth0 will add a default gateway while interface starts, but may be overwrited by next started interface. To avoid this, remove the GATEWAY setting in ifcfg-eth0 and use route-eth0 file
Note. NetworkManager should be stopped

for Example, If there are two interface eth0 and eth1
ifcfg-eth0

DEVICE=eth0
IPADDR=10.3.23.221
NETMASK=255.0.0.0
#GATEWAY=10.3.23.254

ifcfg-eth1

DEVICE=eth0
IPADDR=172.18.101.2
NETMASK=255.255.0.0
#GATEWAY=172.18.254.254

route-eth0

default 10.3.23.254 dev eth0

route-eth1

172.16.0.0/12 via 172.18.254.254 dev eth1

Create a Package repo

1. create /var/pxe/centos6 directory

mkdir -p /var/pxe/centos6

2. mount iso and copy all files into /var/pxe/centos6 and create repo

cp -ivr /media/CentOS_6.3_Final/* /var/pxe/centos6
cd /var/pxe/centos6
createrepo .

3. create conf file /etc/httpd/conf.d/pxeboot.conf

Alias /centos6 /var/pxe/centos6
<Directory /var/pxe/centos6>
  Options Indexes FollowSymLinks
  AllowOverride None
</Directory>

4. Allow selinux httpd_sys_content_t

cd /var/pxe
chcon -R -t httpd_sys_content_t './centos6'

5. Restart httpd

service httpd restart

6. Open browser to check "http://127.0.0.1/centos6" is available Reference:
http://practical-tech.blogspot.tw/2011/10/how-to-configure-pxe-server-in-rhel-6.html
http://httpd.apache.org/docs/current/sections.html

Install RockMongo on Ubuntu

1. Install mongodb
follow the link below to install mongodb
http://docs.mongodb.org/manual/tutorial/install-mongodb-on-ubuntu/


2. Install php5, php-pear
>apt-get install php5 php-pear

3. Install php-mongo
http://www.php.net/manual/en/mongo.installation.php

4. download rockmongo and the unzip and put in /var/www
http://rockmongo.com/downloads

5. restart apache2 mongodb
>service apache2 restart
>service mongodb restart
(If mongodb is locked, please check below link)
http://blog.brianbuikema.com/2011/01/mongodb-ubunto-overview-installation-setup-dev-python-2/


6. Login with admin/admin on http://localhost/rockmongo
(Modify config.php to change login username/password) 

Disable ping response in Linux

sysctl -w net.ipv4.icmp_echo_ignore_all=1

http://www.linuxarticles.org/2010/10/disable-ping-response-in-linux/

Install mongodb on Ubuntu

1. import public key

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10

2. create /etc/apt/sources.list.d/10gen.list

deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen

3.

sudo apt-get update

4.

sudo apt-get install mongodb-10gen

Reference: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian-or-ubuntu-linux/

tsocks

1. install epel first
http://fedoraproject.org/wiki/EPEL
1. insatll tsocks

yum install tsocks

2. add file /etc/tsocks.conf

server = 127.0.0.1
server_type = 5
server_port = 1234

3. establish ssh tunnel

ssh -D 1234 user@xxx.remote.host

4. wget with socks proxy

tsocks wget http://get.something

5. you might want to unset the http_proxy variable

unset http_proxy

Install MediaWiki

1. Install mysql, mysql-server, httpd
#yum install mysql mysql-server httpd

2. start mysql server
#service mysqld start

3. change mysql root password
#mysqladmin ping -u root password 'newpassword'
Enter password: (just press Enter)
mysqld is alive
(The mysql root password was changed to newpassword)


4. Download MediaWiki
http://www.mediawiki.org/wiki/Download

5. Extract to /var/www/html/wiki
#cd /var/www/html
#mkdir wiki
#copy all files intol wiki foler

6. using browser open http://127.0.0.1/wiki
follow the instruction step by step to install MediaWiki

(Note. If install on CentOS 5, must install php53-common and php53-mysql)

7. Backup, using the script
http://www.mediawiki.org/wiki/User:Megam0rf/WikiBackup
schedule the script on crontab weekly

http://www.mediawiki.org/wiki/Manual:Backing_up_a_wiki
http://www.mediawiki.org/wiki/Manual:Restoring_a_wiki_from_backup

install python setuptools (easy_install)

1. Download .egg from http://pypi.python.org/pypi/setuptools/ (according your python version)

2. using sh to execute .egg file

replace new line (\n) using sed

sed ':a;N;$!ba;s/\n/ /g' file

reference:
http://stackoverflow.com/questions/1251999/sed-how-can-i-replace-a-newline-n

install OpenLDAP on CentOS6

1. 使用yum安裝openldap-servers(slapd)和openldap-client(ldap)
yum install openldap-servers openldap-clients

2. 編輯or產生/etc/openldap/ldap.conf
vi /etc/openldap/ldap.conf

URI ldap://127.0.0.1
BASE dc=my-domain,dc=com

3. 複製slapd.conf和DB_CONFIG

cp /usr/share/openldap-servers/slapd.conf.obsolete /etc/openldap/slapd.conf
cp /usr/share/openldap-servers/DB_CONFIG.example /var/lib/ldap/DB_CONFIG

4. slappasswd

打上欲設定的ldap server密碼，將最後一行{SSHA}xxxxxxxxx複製起來

5.編輯/etc/openldap/slapd.conf

把裡面的dc=my-domain,dc=com改成自己要的

在rootpw的地方把剛剛複製的{SSHA}xxxxx貼上去

6.建立一root.ldif檔，內容

#root

dn: dc=my-domain,dc=com

dc: my-domain

objectClass: dcObject

objectClass: organizationalUnit

ou: my-domain.com

7. 先把slapd.d裡的資料移除

rm -rf /etc/openldap/slapd.d/*

8. 使用slaptest將slpad.conf轉成slapd.d/

slaptest -f /etc/openldap/slapd.conf -F /etc/openldap/slapd.d

9. 改變檔案權限及擁有者

chown -R ldap:ldap /var/lib/ldap

chown -R ldap:ldap /etc/openldap/slapd.d

10.將slapd設為system boot up自動啟動

chkconfig slapd on

11.啟動slapd

service slapd start

12. 登入Webmin的LDAP Users and Groups (config要設好)

LDAP server uses encryption? -> Yes SSL

Bind to LDAP server as -> cn=Manager,dc=my-domain,dc=com

Credential for bind name above -> Set to "ldap server password"

13. Open port 389 TCP in firewall

Reference:
http://jamyy.dyndns.org/blog/2012/01/3506.html

nsupdate出現SERVFAIL

查看/var/log/message，因為權限的問題，所以
chown -R named:named /var/named
or
chown -R named:named /var/named/chroot/var/named
還有SELINUX預設也會擋，要關掉bind的部分 named_write_master_zones

setsebool -P named_write_master_zones 1

http://en.wikipedia.org/wiki/Nsupdate
http://fedoraproject.org/wiki/SELinux/named

yum repo setting

若出現cannot find a valid baseurl for repo的訊息
請編輯/etc/yum.repo.d/裡面的.repo檔案
把baseurl前面的#去掉

ntlmaps

1. Download ntlmaps
http://ntlmaps.sourceforge.net/

2. extract
tar xvfz ntlmaps-0.9.9.0.1.tar.gz -C /usr/local/bin

3. create soft symbolic link
ln -s /usr/local/bin/ntlmaps-0.9.9.0.1 /usr/local/bin/ntlmaps

4. Edit server.cfg
vi /usr/local/bin/ntlmaps/server.cfg


5. Run!
/usr/local/bin/ntlmaps/main.py -c /usr/local/bin/ntlmaps/server.cfg


6. Optional: Add run command into /etc/rc.local

Reference:
[1]

不錯的Linux bash shell教學

http://en.wikibooks.org/wiki/Bash_Shell_Scripting
http://linuxconfig.org/Bash_scripting_Tutorial

Eclipse設定SVN以及Mercurial

1. install EclipseMercurial
Update Site: http://cbes.javaforge.com/update

2. install SVN Connector:
Update Site: http://download.eclipse.org/technology/subversive/0.7/update-site/
(the site address might be duplicated)

(under Ubuntu)
1. install mercurial
>sudo apt-get install mercurial

2. install subversion
>sudo apt-get install subversion

Mercurial: push source code on bitbucket.org

1. Register an account on bitbucket.org and create a repository named sample-repo

2. yum install mercurial

3. configure https certificate authorities. create file /etc/mercurial/hgrc contain

[web]
cacerts = /etc/pki/tls/certs/ca-bundle.crt

4. enter the path of source code, initial hg repository
> cd /path/of/source
>hg init

5. create a file .hg/hgrc contain

[ui]
username = FirstName LastName 

6. add file into repository
>hg add

7. commit repository
>hg commit
edit the file to remove some HG: prefix

8. push the repository
>hg push https://your-account@bitbucket.org/your-account/sample-repo

9. Congratulation! You can browse your code on bitbucket.org now.

Reference:
http://mercurial.selenic.com/wiki/Mercurial
http://mercurial.selenic.com/wiki/CACertificates
http://mercurial.selenic.com/wiki/QuickStart

windows安裝 python setuptools easy_install

1. Download setuptools, (setuptools-0.6c11.win32-py2.7.exe)
http://pypi.python.org/pypi/setuptools

2. Add C:\Python27\Scripts in PATH variable

3. Install compiler
http://www.microsoft.com/express/Downloads/#2008-Visual-CPP

3. try using easy_install to install some stuff

讓Linux可以解析到WINS下的機器

1. 在/etc/samba/smb.conf新增

[global]
wins server = ip

2. 更改/etc/nsswitch.conf 的hosts解析方式增加wins
hosts: wins dns files


參考資料:
https://bbs.et8.net/bbs/showthread.php?t=885180

Install freeradius2 on CentOS

1. using yum install freeradius2 and freeradius2-utils (CentOS 5.X)
#yum install freeradius2 freeradius2-utils
CentOS 6.X:
package name is freeradius and freeradius-utils

2. start radiusd with debug mode
#radiusd -X
or, start radiusd service
#service radiusd start

3. add a user. add following line at the top of /etc/raddb/users

testing Cleartext-Password := "password"

4. add a accept client rule in /etc/raddb/client.conf:
client 192.168.0.0/24 {
     secret    = testing123
     shortname = private-network
}

5. restart the radiusd
#service radiusd restart

6. try the user testing is acceptable

$ radtest testing password 127.0.0.1 0 testing123

(If show Access-Accept, It success.
If show "radclient:: Failed to find IP address for XXX", That mean radclient can't resolve XXX, add a line to /etc/hosts likes "127.0.0.1 XXX" or setup DNS correctly)

7. try the user testing from remote client

$ radtest testing password 192.168.1.1 0 testing123

reference:
http://freeradius.org/doc/
http://tec1021.pixnet.net/blog/post/28639573-%E8%BC%95%E9%AC%86%E6%9E%B6%E5%A5%BDradius%E4%BC%BA%E6%9C%8D%E5%99%A8~

Install Celery on CentOS6

1. insall epel (ref-link)

2. install erlang
#yum install erlang

3. install rabbitmq
  a. download rabbitmq rpm (link)
  b. install:
    #rpm -Uvh rabbitmq-xxxx.rpm
  c. let rabbitmq daemon auto-start on boot up:
    #chkconfig rabbitmq-server on
  d. start rabbitmq server:
    #service rabbitmq-server start

4. install Celery
#easy_install Celery

5. install django-celery
#easy_install django-celery

6. setting up django-celery on project (link)