Tips5

ssh automatic login without password not working

admin — Tue, 21 Feb 2012 05:53:26 +0000

If you just setup your ssh rsa key to enable ssh automatic login without password,but it doesn't work,normally it's caused by a wrong group permission of your .ssh directory or it's parent directory.So just follow below steps to get it out. 1.Check your .ssh directory permission,if it's not 700,please use chmod command to change it to 700 2.Check the parent directory of .ssh,if it's 770 even 777,pls change it to 750 at least 3.If above 2 steps still can not fix your issue,you can try to copy authorized_keys to authorized_keys2 Thinking:If other users have the permission to access your ssh key files ,then they could copy it to their own directory then they can ssh to the server automatically without password using your account. Reference: ssh automatic login without password prompt

fatal: open database /etc/postfix/aliases.db: No such file or directory

admin — Tue, 21 Feb 2012 02:41:02 +0000

Today I found one of my server can't send mail successfully ,and I try to restart postfix service but get below error from /etc/log/maillog

fatal: open database /etc/postfix/aliases.db: No such file or directory

Then I just checked /etc/postfix directory,there is no aliases and aliases.db file,so I did the below steps,everything works well then:

service postfix stop ln -s /etc/aliases /etc/postfix/aliases newaliases service postfix start

Note:if you only missed the aliases.db file,so you need not to create the link from /etc/aliases to /etc/postfix/aliases

wp-syntax character “” map issue

admin — Sun, 05 Feb 2012 13:07:16 +0000

I'm using wordpress with plugin wp-syntax but I found some wp-syntax can't map some special character correctly. Eg. "<" is showed as "<" and ">" is showed as ">" After sear on the web,I found we can fix this issue via below method: 1.Find your wp-syntax.php file and open it 2.Fine line

$geshi = new GeSHi($code, $language);

and replace it with

$geshi = new GeSHi(htmlspecialchars_decode($code), $language);

Note:This method only works if your web server with php 5.1 or higher was installed Below code is for testing purpose:

----->
<-----

create bootable usb from iso in windows

admin — Sat, 01 Oct 2011 02:58:41 +0000

This guide will show you how to create a windows bootable usb drive using free software WintoFlash which support xp vista and windows 7,you can select to create this bootable usb from your installation CD/DVD or iso image file. Requirements to create bootable usb from iso in windows

1.4G+ usb drive (2G will be ok for windows xp)
2.windows installation iso file
3.Software can mount iso as virtual drive(eg:Daemon tools) or unzip iso file(eg:7-zip )

Steps to create windows bootable usb 1.Insert your usb drive to your computer and backup useful data from usb to a safe place because below step will format your usb drive 2.Download the latest WintoFlash from http://wintoflash.com/download/en/ 3.Use 7-zip to extract your windows installation iso file or use Daemon Tool to mount it as a virtual drive 4.Open program Wintoflash (run as administrator if you are using Vista or 7) and f0llow then instructions to create your bootable usb from iso. 5.Done and now you can reboot your computer and setup BIOS to boot from this bootable usb to install your new OS

Change wallpaper in windows 7 starter

admin — Sun, 25 Sep 2011 10:23:30 +0000

By default ,Windows 7 does not include the function to let user change wallpaper or background,normally we can use 3-rd party applications or tweak registry to change wallpaper in windows 7starter Method 1:To change wallpaper / desktop background using 3-rd party tools in windows 7 Starter

You can download Personalization Panel to change your desktop wallpaper in windows 7 starter,you can refer below link with screenshots.

Personalize windows 7 starter / Home basic

Method 2:To change wallpaper / desktop background by tweaking your registry in windows 7 starter Please refer below post : Windows 7 starter change wallpaper

windows 7 disable hibernation

admin — Sat, 17 Sep 2011 13:57:24 +0000

On a laptop of windows 7, Hibernation is enabled by default to save power so that the battery can last longer,if you do not need this feature,please follow below steps to enable or disable hibernate in windows 7. 1.Click Start , type cmd in the search box then press Enter to open a Command Prompt 2.Type in the following command and press Enter to disable Hibernation feature in windows 7. Note:1.This will also remove your hibernation file hiberfil.sys which locates under C:\ 2.To turn of hibernation ,just use command powercfg -h on

powercfg -h off

3.To keep hibernation feature enabled but turn off hibernation in you power plan,pls a)Go to Control Panel(Small icons view),open Power Options then open Advanced Power settings b)Expand to Sleep-- Hibernate after to set the value to 0 (zero) to turn off hibernation in windows 7 c)Click OK to save change

Fix copy / paste issue between vnc and windows

admin — Wed, 14 Sep 2011 05:16:29 +0000

If you experience copy / paste issues between your vnc and windows,please see below checklist to troubleshoot. 1.Make sure you enable copy / paste feature in your vnc viewer options.(Send clipboard changes to server and Accept clipboard changes from server) 2.Make sure your have run process vncconfig on your linux /unix server .If not,just run command "vncconfig -nowin &" ,also I suggest to put this command to your xstartup files

vncconfig nowin &

3.If you only cannot copy / paste in gvim or other GNU tools,you need to replace "vncconfig nowin &" with "vncconfig -poll 1000 nowin&" (Seems this is a bug of Realvnc)

vncconfig -poll 1000 -nowin &

4.If you can copy / paste between vnc and your windows at the beginning,but cannot after a while,you need to close your vncviewer,then re-connect again.

Show system files in windows 7

admin — Mon, 12 Sep 2011 11:35:06 +0000

A system file is any file on your computer that's essential for running Windows. System files are usually found in the Windows folder or the Program Files folder System files are hidden by default. It's best to keep system files hidden to avoid accidentally modifying or deleting them. If you need to view your system files. 1.Launch Folder Options window from Windows Explorer (In top left pane,click Organize then Folder and Search Options ) 2.In Folder Options window,go to View tab,under Advanced settings,clear the check box of Hide protected operating system files (Click Yes on the prompt warning window) 3.Click Apply then OK .(Please hide the system protected files and folders again after you finish your job). Tip:Use the same way you can show hidden files and folders in windows 7 (Clear the check box of show hidden files ,folders and drives)

windows 7 desktop icons missing / disappear

admin — Fri, 09 Sep 2011 23:24:04 +0000

If you found all the icons disappeared from you desktop,you must hided them by mistake. To restore the missing desktop icons ,just right-click your desktop,go to view then check show desktop icons The same way,you can restore your missing gadgets by checking show desktop gadgets Tip:You also can right-click an empty area on the desktop then go to view to change desktop icon size in windows 7

Enable or disable built-in administrator account in Windows 7

admin — Thu, 01 Sep 2011 13:11:36 +0000

Note:To enable or disable the built-bin administrator account in windows 7,you must already get the administrators privilege. 1.Right-click My Computer and click Manage 2.In the left pane,browse to Local Users and Groups / Users 3.In the right pane of Users ,double click Administrator ,check or clear the check box of "Account is disabled" to disable or enable administrator account in windows 7. Tip:1.You also can use command line or Local Security Policy Editor the enable or disable administrator account in windows 7,refer below post

Enable or disable administrator account in windows 7

2.If you want to only hide administrator account from logon screen ,you can refer

Tips5

ssh automatic login without password not working

fatal: open database /etc/postfix/aliases.db: No such file or directory

wp-syntax character “” map issue

create bootable usb from iso in windows

Change wallpaper in windows 7 starter

windows 7 disable hibernation

Fix copy / paste issue between vnc and windows

Show system files in windows 7

windows 7 desktop icons missing / disappear

Enable or disable built-in administrator account in Windows 7

Enable or disable administrator account in windows 7

Hide user account from welcome screen in windows 7