# /bin/sync; echo 3 > /proc/sys/vm/drop_caches
Another way to use it and to clear up swap as well
/bin/sync; echo 3 > /proc/sys/vm/drop_caches && swapoff -a && swapon -a
How to drop CentOS memory cache ?
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Required RPMs to install DirectAdmin on CentOS 5/6
# yum install wget gcc gcc-c++ flex bison make bind bind-libs bind-utils openssl openssl-devel perl quota libaio libcom_err-devel libcurl-devel gd zlib-devel zip unzip libcap-devel cronie bzip2 db4-devel cyrus-sasl-devel perl-ExtUtils-Embed autoconf automake libtool
How to install libmcrypt on CentOS 6.x via RPM ?
CentOS 6.x (64 bit) Installation Notes:
# cd /tmp/
# wget http://pkgs.repoforge.org/libmcrypt/libmcrypt-devel-2.5.7-1.2.el6.rf.x86_64.rpm
# wget http://pkgs.repoforge.org/libmcrypt/libmcrypt-2.5.7-1.2.el6.rf.x86_64.rpm
# rpm -Uhv libmcrypt-*.rpm
How to find files that was last accessed 12 hours ago ?
Each file in Linux has three time stamps, which record the last time that certain actions were performed on the file:
[a] access (read the file’s contents) – atime (days) OR amin (minutes)
[b] change the status (modify the file or its attributes) OR ctime (days) / cmin (minutes)
[c] modify (change the file’s contents) – mtime (days) OR mmin (minutes)
- -amin +720 means you are looking for a file accessed 12 hours (720 minutes) ago.
- -amin -720 means less than 12 hours (720 minutes).
- -amin 720 If you skip + or – it means exactly 12 hours (720 minutes).
# find /home/* -iname "*.mp4" -amin -720
How to Delete All admin Tickets (Messages) from Directadmin
To delete all the admin messages (tickets) from direct admin control panel:
- Goto this folder /usr/local/directadmin/data/tickets
# cd /usr/local/directadmin/data/tickets
- Delete all the folder content, which is the messages
# rm -Rf * - Clear up the messages database file
# echo "" > /usr/local/directadmin/data/admin/tickets.list
All messages should be cleared now, mostly those messages are from the brute-force attack logs, if you don’t mind about such messages you can disabled this feature in DirectAdmin control panel.
To achieve that, from the DirectAdmin Panel -> Extra Features, click on Administrator Settings and choose No for the Security Option Parse service logs for brute force attacks
How to setup 32-bit ODBC DSN on Windows Server 2008 R2
To create a 32bit ODBC DSN on Windows Server 2008 R2, do the following steps:
- Click Start -> Run
- Type in the run box
C:\Windows\SysWOW64\odbcad32.exe - Create the DSN