Windows 7 SSD Tips

The list may be updated.

• You probably already know this:
  Install large programs on the HDD instead of the SSD drive.
  
• Disabling hibernation saves you X GBs on the SSD drive, where X is the size of your RAM.
  Run cmd as administrator.
  Type in:  powercfg -h off
  
• Move Documents, Movies, Pictures, Music folder on the HDD drive.
  Moving these directories is easy. Just right-click on them, click Properties, click Location and click Move.
  
• Move AppData folder - this is the folder where your installed programs store temporary and/or your local data which is used by those programs. It can grow really large in size.
  There is no simple procedure to do this, so this option is not really preferred.
  
• Move the whole Users folder.
  LifeHacker has an article about it. Again, not a really simple solution.

Windows 7 File permission problem after reinstallation

Run command line as administrator

For Folders or Directories (will perform action recursively):

takeown /f directory_name /r /d y
icacls directory_name /grant administrators:F /t

Replace file_name or directory_name with actual file name or folder name, with path when applicable. The first command will take ownership of the file or folder specified, and the second command will grant full control permissions to administrators user group. Note that when using command for folders, to command will run recursively. To prevent the task been perform recursively, remove the “/r” and “/t” switch.


Source: http://forum.thewindowsclub.com/windows-tips-tutorials-articles/18379-how-take-ownership-full-control-permissions-files-folders-windows.html

Google Maps API Key for Android (Eclipse, Windows)

There are two main types of keystores in Eclipse - one is for debugging (a keystore with no password) and the other one is when you create a new one yourself, with a password.

To make Google Maps work on your Android app, you need to enter a MD5 fingerprint of your keystore in Google Maps API signup: http://code.google.com/android/maps-api-signup.html

And here's how you get your keystore's MD5 fingerprint in Windows.

1. You probably already have JDK installed. Find out your Java bin directory. Mine is:
   C:\Program Files\Java\jdk1.6.0_24\bin
2. Enter this directory path in your PATH Environment variable (see picture).
3. Start "cmd" and navigate to your
   C:\Users\<yourusername>\.android
   directory
4. Type this command:
   keytool -list -keystore debug.keystore
5. The password is empty, just hit enter
6. You're done. Copy the MD5 fingerprint in that url, you get an API key, which you use in your Android MapView Layout file.
   android:apiKey="your api key here"

Repcached does not compile

If you want the tutorial on installing repcached, click here.

For the record, I am using:

Ubuntu 11.10 

Linux 3.0.0-12-server #20-Ubuntu SMP Fri Oct 7 16:36:30 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)

GNU Make 3.81

If you're getting this error when doing make for repcached,



memcached.c: In function âadd_iovâ:
memcached.c:696:30: error: âIOV_MAXâ undeclared (first use in this function)
memcached.c:696:30: note: each undeclared identifier is reported only once for each function it appears in
memcached.c: In function âprocess_statâ:
memcached.c:1127:9: warning: format â%dâ expects argument of type âintâ, but argument 3 has type âlong unsigned intâ [-Wformat]
memcached.c:1134:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1138:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1139:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1140:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1141:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1142:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1143:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1144:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1145:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c:1146:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âsize_tâ [-Wformat]
memcached.c:1149:9: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c: In function âprocess_get_commandâ:
memcached.c:1331:19: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
memcached.c: In function âdo_add_deltaâ:
memcached.c:1573:5: warning: format â%lluâ expects argument of type âlong long unsigned intâ, but argument 3 has type âuint64_tâ [-Wformat]
make[2]: *** [memcached-memcached.o] Error 1
make[2]: Leaving directory `/root/memcached-1.2.8-repcached-2.2'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/root/memcached-1.2.8-repcached-2.2'
make: *** [all] Error 2

Related discussion here.

Compiler says that IOV_MAX is not defined. I'm not really sure what this is, but it compiled fine on Ubuntu 10.04. I guess that const is not used anymore.

In memcached.c code, we can see that IOV_MAX is defined if the OS is FreeBSD or iOS, so I decided to just define it anyway.

Here is my diff of the code that made it compile, in case you need it.

57,59c57

< #if defined(__FreeBSD__) || defined(__APPLE__)

< # define IOV_MAX 1024

< #endif

---

> #define IOV_MAX 1024

PHP :: Advice on using count()

I may be a little late realising this, but a few dozen thousand lines of PHP code in, it's better late than never.

Let's look at example #1 on count() manual
http://php.net/manual/en/function.count.php

$result = count(null); // $result == 0
$result = count(false); // $result == 1


Does this strike you as a bit odd? Why the hell should count(0) or count(false) be equal to 1?

Well strangely enough, that's how it is. So for example, if you wrote a mysql_query() wrapper where you return false if the query fails and if you expect an array where you check the number of items, you find out that if the query fails, the count will return 1, and you might get some unexpected results.

Keeping computer security in mind, it's best to avoid count() when just checking if some data is returned.

Alternatives are empty() if checks if a variable contains something other than 0, '0', null, false, array() or ''.

OR, in your wrapper functions, if the query fails, just return NULL!

Apache :: Could not determine fully qualified domain name

Error message:

apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName


Is preety much self-explanatory

Add this
ServerName localhost

In your server configuration file.

Apache :: VirtualHost overlap on port

Errors like


[warn] _default_ VirtualHost overlap on port 443, the first has precedence

are caused because the virtualhosts are not named.

(The same applies for any other port, for example 80)

Add this in your apache configuration file

NameVirtualHost *:443

In Ubuntu server, Linux, that configuration is actually located in the ports.conf file in /etc/apache2.


NameVirtualHost *:80
NameVirtualHost *:443


Listen 80

MySQL not starting when restoring files in /var/lib/mysql

If you get errors like:


120226  1:54:14 [Note] Plugin 'FEDERATED' is disabled.
120226  1:54:14  InnoDB: Initializing buffer pool, size = 8.0M
120226  1:54:14  InnoDB: Completed initialization of buffer pool
120226  1:54:15  InnoDB: Started; log sequence number 0 44233
120226  1:54:15 [ERROR] Event Scheduler: Failed to open table mysql.event
120226  1:54:15 [ERROR] Event Scheduler: Error while loading from disk.
120226  1:54:15 [Note] Event Scheduler: Purging the queue. 0 events
120226  1:54:15 [ERROR] Aborting


120226  1:54:15  InnoDB: Starting shutdown...
120226  1:54:20  InnoDB: Shutdown completed; log sequence number 0 44233
120226  1:54:20 [Note] mysqld: Shutdown complete

or

120226  1:59:18 [Note] Plugin 'FEDERATED' is disabled.

mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)

120226  1:59:18 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.

120226  1:59:18  InnoDB: Initializing buffer pool, size = 8.0M

120226  1:59:18  InnoDB: Completed initialization of buffer pool

120226  1:59:18  InnoDB: Started; log sequence number 0 44233

120226  1:59:18 [ERROR] mysqld: Can't find file: './mysql/host.frm' (errno: 13)

120226  1:59:18 [ERROR] Fatal error: Can't open and lock privilege tables: Can't find file: './mysql/host.frm' (errno: 13)

You need to check the file permissions.

The user and group is mysql:mysql

File permissions are rw for user and group (660)

Solution

chown mysql:mysql -R /var/lib/mysql

chmod 660 -R /var/lib/mysql

NETBIOS / Samba share does not accept username and password

If your username and password gets rejected when logging in MS file share, try using the INT domain for login.

example:

username: INT\your_username
password: your_password

Linux/Ubuntu :: pure-ftpd does not allow login to user with /usr/sbin/nologin shell

Expectations:
You have created a user with /usr/sbin/nologin shell (ftp-only user) in Linux/Ubuntu.
If you SSH to the box with this username and password it should not work.
If you FTP to the box with this username and password it should.

Symptoms:
Pure-ftpd does not permit login if the shell is set to /bin/false or /usr/sbin/nologin.
If you change the shell to /bin/bash it works.


Connected to localhost.
220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
220-You are user number 2 of 50 allowed.
220-Local time is now 17:53. Server port: 21.
220-This is a private system - No anonymous login
220-IPv6 connections are also welcome on this server.
220 You will be disconnected after 15 minutes of inactivity.
Name (localhost:root): ftponly
331 User ftponly OK. Password required
Password:
530 Login authentication failed
Login failed.
Remote system type is UNIX.
Using binary mode to transfer files.

Solution:

You need to add the nologin or false shell to the file /etc/shells.

root@box:/# cat /etc/shells

# /etc/shells: valid login shells

/bin/csh

/bin/sh

/usr/bin/es

/usr/bin/ksh

/bin/ksh

/usr/bin/rc

/usr/bin/tcsh

/bin/tcsh

/usr/bin/esh

/bin/dash

/bin/bash

/bin/rbash

/usr/bin/screen

/bin/false

/usr/sbin/nologin