OpenVZ vps creation “Error in check_mount_restrictions (ploop.c:1627)”

I wasn’t able to create new vps in node due to following ploop error.

From the log
Creating image: /vz/private/350.tmp/root.hdd/root.hdd size=2306867K
Creating delta /vz/private/350.tmp/root.hdd/root.hdd bs=2048 size=4614144 sectors v2
Storing /vz/private/350.tmp/root.hdd/DiskDescriptor.xml
Error in check_mount_restrictions (ploop.c:1627): The ploop image can not be used on ext3 or ext4 file system without extents
Failed to create image: Error in check_mount_restrictions (ploop.c:1627): The ploop image can not be used on ext3 or ext4 file system without extents [21]
Destroying container private area: /vz/private/350
Creation of container private area failed


Check whether the partition is on ext4 filesystem or not. Ploop doesn’t work on ext3 filesystem. My node’s /vz partition was on ext3 filesystem.

We cannot simply upgrade the /vz partition from ext3 to ext4 as lots of vps are running on it. Here I have checked the vzctl version and found it was latest one 4.7.x

# vzctl --version
vzctl version 4.7.1

The latest vzctl tries to create template as ploop which is advanced than simfs. Since the partition runs on ext3 filesystem, the safest way to fix the issue is to downgrade the version of vzctl to 4.5.x

version 4.5.1 is not available in openvz anymore. You may need to manually download the rpm of vzctl and vzctl-core from and install it.

Before installing it, remove the current vzctl 4.7.x

# yum remove vzctl
# cd /usr/src
# wget
# wget

# rpm -Uvh vzctl-core-4.5.1-1.x86_64.rpm
Preparing... ########################################### [100%]
1:vzctl-core ########################################### [100%]

# rpm -Uvh vzctl-4.5.1-1.x86_64.rpm
Preparing... ########################################### [100%]
1:vzctl ########################################### [100%]
vz-postinstall: /etc/sysctl.conf: add net.bridge.bridge-nf-call-ip6tables = 1
vz-postinstall: /etc/sysctl.conf: add net.bridge.bridge-nf-call-iptables = 1

# vzctl --version
vzctl version 4.5.1

Create container now 🙂

# vzctl create 101 --ostemplate centos-6-x86_64-cpanel --private /vz/private/101 --root=/vz/root/101 --config configname
Creating container private area (centos-6-x86_64-cpanel)
Performing postcreate actions
CT configuration saved to /etc/vz/conf/101.conf
Container private area was created

Wowza Streaming Engine (RHEL/Centos/Fedora)

Wowza Streaming Engine (known as Wowza Media Server prior to version 4) is unified server software developed by Wowza Media Systems. The server is used for streaming of live and on-demand video, audio, and RIAs (rich Internet applications) over IP networks to desktop, laptop, and tablet computers, mobile devices, IPTV set-top boxes, internet-connected TV sets, and other network-connected devices. The server is a Java application deployable on the following operating systems: Linux, Mac OS X, Solaris, Unix, and Windows.

Installation of Wowza

1) Firt install Java in your server as it is a Java based application.

#yum install java java-openjdk

# java -version
java version "1.6.0_18"
OpenJDK Runtime Environment (IcedTea6 1.8.8) (fedora-
OpenJDK Client VM (build 14.0-b16, mixed mode)

2) Download Wowza installation binary from their site

#cd /usr/src

3) Give permission for execution

#chmod +x WowzaStreamingEngine-4.0.6.rpm.bin

4) Execute it


Do you agree to the above license terms? [yes or no]
Wowza Streaming Engine Manager is a browser-based application for managing the Wowza Streaming Engine software.
Enter an Administrator user name and password that you want to use to sign in to the manager.
Note: User Name and Password are case-sensitive.
User Name: wowza
Confirm Password:
Please enter a Wowza Streaming Engine license key in this format:

((( For the license you may need to purchase from or you can try free license just for installation purpose, they will send it to your mail after signing up)))

Wowza Streaming Engine license key accepted. Thank you!
Installing Wowza Streaming Engine
Preparing... ########################################### [100%]
1:WowzaStreamingEngine ########################################### [100%]

Start Wowza Streaming Engine automatically when this system reboots? [yes or no]
Starting WowzaStreamingEngine (via systemctl):
WowzaStreamingEngine: stopping...
WowzaStreamingEngine stopped

WowzaStreamingEngine stopped

WowzaStreamingEngine: starting...
WowzaStreamingEngine started PID:(1751) [ OK ]
Starting WowzaStreamingEngine (via systemctl):
WowzaStreamingEngineManager: stopping...
WowzaStreamingEngineManager stopped
WowzaStreamingEngineManager stopped
WowzaStreamingEngineManager: starting...
WowzaStreamingEngineManager started PID:(1779) [ OK ]
Install Location:

To access Wowza Streaming Engine Manager, go to http://localhost:8088/enginemanager in a web browser.


# chkconfig --level 345 WowzaStreamingEngine on
# chkconfig --level 345 WowzaStreamingEngineManager on

5) Allow it’s port to accept incoming connections.

# iptables -I INPUT -p tcp --dport 1935 -j ACCEPT

6) Check whether wowza is working?

# netstat -plan | grep :1935
tcp 0 0 :::1935 :::* LISTEN 1352/java

7) Install all examples in wowza
(LiveDVRStreaming, LiveVideoStreaming, ServerSideModules, SHOUTcast, VideoChat, VideoOnDemandStreaming, WebcamRecording)

#cd /usr/local/WowzaStreamingEngine/examples
# ./
Skipping LiveVideoStreaming. Already configured.
Installing LiveDVRStreaming...
Installing ServerSideModules...
Installing SHOUTcast...
Installing VideoChat...
Skipping VideoOnDemandStreaming. Already configured.
Skipping WebcamRecording. Already configured.
If Wowza Streaming Engine is running, you must restart it to see the installed examples.

8) Go to http://WowzaserverIP:8088/enginemanager and supply the user/pass you have given while installation. Enjoy working with Wowza now 🙂




If you see the wowza page getting connection time outs or connection refused error. Check wowza log for details.

# tail -f wowzastreamingengine_error.log
WARN vhost comment 2014-08-18 01:02:39 - - - - - 20.422 - - - - - - - _defaultVHost_ Bind failed, try again ([any]:1935): Address already in use
WARN vhost comment 2014-08-18 01:02:44 - - - - - 25.426 - - - - - - - _defaultVHost_ Bind failed, try again ([any]:1935): Address already in use
WARN vhost comment 2014-08-18 01:02:49 - - - - - 30.429 - - - - - - - _defaultVHost_ Bind failed, try again ([any]:1935): Address already in use
WARN vhost comment 2014-08-18 01:02:54 - - - - - 35.432 - - - - - - - _defaultVHost_ Bind failed, try again ([any]:1935): Address already in use
WARN vhost comment 2014-08-18 01:02:59 - - - - - 40.434 - - - - - - - _defaultVHost_ Bind failed, try again ([any]:1935): Address already in use

I found some other process started using the same port with server IP. I had to kill all the current processes and restart application.

# netstat -plan | grep :1935
tcp 0 0 :::1935 :::* LISTEN 1352/java
# kill -9 1352
# ps auxf | grep -i wowza

Kill all wowza process you get from ps command.

Now start WowzaStreamingEngine and WowzaStreamingEngineManager

# /etc/init.d/WowzaStreamingEngine start
WowzaStreamingEngine stopped

WowzaStreamingEngine: starting...
WowzaStreamingEngine started PID:(2751) [ OK ]
# /etc/init.d/WowzaStreamingEngineManager start
WowzaStreamingEngineManager stopped
WowzaStreamingEngineManager: starting...
WowzaStreamingEngineManager started PID:(2778) [ OK ]


Red5 Media Server: Installation And Configuration (Centos/Fedora/RHEL)

Red5 Media Server delivers a powerful video streaming and multi-user solution to the ©Adobe ©Flash Player and other exciting client technologies. It works based on Java and some of the most powerful open source frameworks, Red5 stands as a solid solution for business of all sizes including the enterprise.

Streaming Video (FLV, F4V, MP4, 3GP)
Streaming Audio (MP3, F4A, M4A, AAC)
Recording Client Streams (FLV and AVC+AAC in FLV container)
Shared Objects
Live Stream Publishing
Protocols: RTMP, RTMPT, RTMPS, and RTMPE

Lets look at the installation and configuration part:

1) First you need to install Java since red5 is a Java server. Use yum to install it.
If you are not sure about the version or proper package to be installed from yum repo, then search it.

# yum search java | grep openjdk
java-1.6.0-openjdk-devel.i686 : OpenJDK Development Environment
java-1.6.0-openjdk.i686 : OpenJDK Runtime Environment
java-1.6.0-openjdk-demo.i686 : OpenJDK Demos
java-1.6.0-openjdk-javadoc.i686 : OpenJDK API Documentation
java-1.6.0-openjdk-plugin.i686 : OpenJDK Web Browser Plugin
java-1.6.0-openjdk-src.i686 : OpenJDK Source Bundle

I am gonna install java-1.6.0-openjdk.i686 and java-1.6.0-openjdk-devel.i686 from it.

#yum install java-1.6.0-openjdk.i686 java-1.6.0-openjdk-devel.i686

2) Now we need to install SVN to retrieve new red5 release from Google SVN repositary.

#yum install subversion

3) Install Ant and Ivy in support for Java
Apache Ant is a Java library and command-line tool that help building software. Ivy is a dependency manager, it manages and controls the JAR files that your project depends on. If you don’t have the JARs, it works by default by taking from the Maven repository directly, which can make project setup a lot easier.

Download binary form of apache-ant(NOT THE SOURCE CODE)

# cd /usr/src
# wget (:::You can download latest from
# tar xvf apache-ant-1.9.4-bin.tar.gz
# mv apache-ant-1.9.4 /usr/local/ant

Make a symlink for ant binary to /usr/bin for the shortcut and easiness to access it.

#ln -s /usr/local/ant/bin/ant /usr/bin/ant

Download Ivy from Apache repositary

# cd /usr/src
# svn co ivy
# cd ivy
# ant jar

Wait for few minutes for process to be over. Once it is success, you will see the Build Complete Message.

# cp build/artifact/jars/ivy.jar /usr/local/ant/lib/   (::: Since you are in path cd /usr/src/ivy)

4) Export Variables for Ant and Java:

Java and Ant is in place now, now we need to make sure we set Environment Variables. They are global variables with paths specified to different binaries or applications. ANT and JAVA will need those.

# export ANT_HOME=/usr/local/ant
# export JAVA_HOME=/usr/lib/jvm/java
# export PATH=$PATH:/usr/local/ant/bin

5) Actual Installation of Red5 Server begins

We need to fetch the Red5 source from Google SVN repositary.

# cd /usr/src
# svn co red5
# mv red5 /usr/local/
# cd /usr/local/red5

(This is the folder where all the source files reside. From here on, we prepare and build the red5 source)

# ant prepare
# ant dist

Wait for sometime for the process to be completed. Once it is over, you will see message “BUILD SUCCESSFUL” at the end.

Copy the conf directory from the dist folder to the current directory and test the red5 installation.

# cp -r dist/conf .             (::: Since you are in path /usr/local/red5)
# ./

You will see a lot of process going on in screen and it starts the Red5 server.

Check whether the ports 5080 and 1935 are listening or not in a second/duplicate shell

# netstat -plan | grep -E ‘:5080|:1935’
tcp 0 0 :::1935 :::* LISTEN 1309/java
tcp 0 0 :::5080 :::* LISTEN 1309/java

Test if server works by checking the url http://yourserverIP:5080

Make sure you enable incoming connections to ports 5080 and 1935 in server.

# iptables -A INPUT -p tcp -m tcp –dport 5080 -j ACCEPT
# iptables -A INPUT -p tcp -m tcp –dport 1935 -j ACCEPT
[[[NOTE::: The red5 runs only as long as you keep the terminal window open since you started running the script in it. It will stop running if you close shell which is not an efficient way to run red5 server like that way. You need to make sure it can run by its own initiative]]]

You may need to set the script starts running while server boots up, do the following for it.

#vi /root/

Enter the following commands in it.

cd /usr/local/red5/

#chmod +x /root/

Set this script in file /etc/rc.local so that it will start running along with start up scripts in server.
So the rc.local would like as shown below:
# cat /etc/rc.local
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don’t
# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local
sh /root/ &

((In above the “&” at the tail end of command “sh /root/” is run the process in background))
6) Setup an Init script for Red5 server

# vi /etc/init.d/red5

Then enter the following script in it.

# For RedHat and cousins:
# chkconfig: 2345 85 85
# description: Red5 flash streaming server
# processname: red5
# Source function library
. /etc/rc.d/init.d/functions
[ -r /etc/sysconfig/red5 ] && . /etc/sysconfig/red5
case “$1” in
echo -n $”Starting $PROG: ”
$DAEMON >/dev/null 2>/dev/null &
if [ $RETVAL -eq 0 ]; then
echo $! > $PIDFILE
touch /var/lock/subsys/$PROG
[ $RETVAL -eq 0 ] && success $”$PROG startup” || failure $”$PROG startup”
echo -n $”Shutting down $PROG: ”
killproc -p $PIDFILE
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$PROG
$0 stop
$0 start
status $PROG -p $PIDFILE
echo $”Usage: $0 {start|stop|restart|status}”
exit $RETVAL

Assign execute permission to red5 script

# chmod +x /etc/init.d/red5

Now start the service

# service red5 start OR /etc/init.d/red5 start

Set Red5 to start along with start up programs while server booting

# chkconfig –add red5
# chkconfig red5 on

To install some RED5 demos

# cd /usr/local/red5/webapps/root
# svn checkout

To install some demo apps


Then install Admin demo and Ofla Demo from the page

Access Demo Apps in Red5


Test ofla demo


Then correct rtmp url like rtmp://yourserverip/oflaDemo and hit connect. Choose any of the demos from the list and play it.


Test Publisher to live stream, record videos etc.

You will see three tabs on left side server, video, audio

In server tab, change the location to rtmp://yourserverip/oflaDemo and on the video tab, select your cam from Device scroll list.


All the above would work fine if you follow the instructions correctly 🙂


Some error you may encounter while the installation time

1) During the step ant prepare and ant dist , you may sometime reach at the following error.

[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::
[ivy:resolve] :: org.apache.commons#commons-modeler;2.0.1: not found
[ivy:resolve] :: red5#xmlrpc;2.0.1: not found
[ivy:resolve] ::::::::::::::::::::::::::::::::::::::::::::::

For this change the following path in file ivysettings.xml in directory /usr/local/red5/

replace the
<artifact pattern=”[organisation]/[artifact]-[revision].[ext]”/>
<artifact pattern=”[artifact]/[artifact]/[revision]/[artifact]-[revision].[ext]”/>



Install FFMPEG in Fedora/Centos/RHEL

FFmpeg is a free software project that produces libraries and programs for handling multimedia data. FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. It supports the most obscure ancient formats up to the cutting edge. No matter if they were designed by some standards committee, the community or a corporation.

Reference from

How to install it?

(((First of all, please note the below installation steps are based on working with fedora/centos/rhel)))

1) Install the additional repo

Download it from and choose it with your servers exact architecture and OS version.

I installed,

rpm -Uhv

Since I am running Centos 6.x i686.

Update repository

# yum -y update

Install all necessary packages in support for ffmpeg

# yum install glibc gcc gcc-c++ autoconf automake libtool git make nasm pkgconfig
# yum install SDL-devel a52dec a52dec-devel alsa-lib-devel faac faac-devel faad2 faad2-devel
# yum install freetype-devel giflib gsm gsm-devel imlib2 imlib2-devel lame lame-devel libICE-devel libSM-devel libX11-devel
# yum install libXau-devel libXdmcp-devel libXext-devel libXrandr-devel libXrender-devel libXt-devel
# yum install libogg libvorbis vorbis-tools mesa-libGL-devel mesa-libGLU-devel xorg-x11-proto-devel zlib-devel
# yum install libtheora theora-tools
# yum install ncurses-devel
# yum install libdc1394 libdc1394-devel
# yum install amrnb-devel amrwb-devel opencore-amr-devel
2) Install xvid
It is a video codec library following the MPEG-4 standard, specifically MPEG-4 Part 2 Advanced Simple Profile (ASP). It uses ASP features such as b-frames, global and quarter pixel motion compensation, lumi masking, trellis quantization, and H.263, MPEG and custom quantization matrices.

#cd /opt
#tar xzvf xvidcore-1.3.2.tar.gz
#cd xvidcore/build/generic
#./configure –prefix=”$HOME/ffmpeg_build”
(::: Here $HOME means, since you run this as root, the home directory will be choosen as /root)
#make install

3) Install LibOgg
It is designed to provide for efficient streaming and manipulation of high quality digital multimedia.

#cd /opt
#tar xzvf libogg-1.3.1.tar.gz
#cd libogg-1.3.1
#./configure –prefix=”$HOME/ffmpeg_build” –disable-shared
#make install

4) Install Libvorbis
It is the reference implementation of the Vorbis codec. It is the lowest-level interface to the Vorbis encoder and decoder, working with packets directly.

#cd /opt
#tar xzvf libvorbis-1.3.4.tar.gz
#cd libvorbis-1.3.4
#./configure –prefix=”$HOME/ffmpeg_build” –with-ogg=”$HOME/ffmpeg_build” –disable-shared
#make install

5) Install Libtheora
It is a free lossy video compression format. It is developed by the Xiph.Org Foundation and distributed without licensing fees alongside their other free and open media projects, including the Vorbis audio format and the Ogg container.

#cd /opt
#tar xzvf libtheora-1.1.1.tar.gz
#cd libtheora-1.1.1
#./configure –prefix=”$HOME/ffmpeg_build” –with-ogg=”$HOME/ffmpeg_build” –disable-examples –disable-shared –disable-sdltest –disable-vorbistest
#make install

6) Install Aacenc
It’s AAC(Advanced Audio Coding) Decoder.

# cd /opt
# wget
# tar xzvf vo-aacenc-0.1.3.tar.gz
# cd vo-aacenc-0.1.3
# ./configure –prefix=”$HOME/ffmpeg_build” –disable-shared
# make
# make install

7) Install Yasm
It is an assembler and disassembler for the Intel x86 architecture. It can be used to write 16-bit, 32-bit (IA-32) and 64-bit (x86-64) programs. Yasm is a full rewrite of Netwide Assembler (NASM).

# yum remove yasm
# cd /opt
# wget
# tar xzfv yasm-1.2.0.tar.gz
# cd yasm-1.2.0
# ./configure –prefix=”$HOME/ffmpeg_build” –bindir=”$HOME/bin”
# make
# make install
# export “PATH=$PATH:$HOME/bin”

8) Install Libvpx
It is a video compression format owned by Google.

# cd /opt
# git clone
# cd libvpx
# git checkout tags/v.1.3.0
# ./configure –prefix=”$HOME/ffmpeg_build” –disable-examples
# make
# make install

9) Install X264
It is a free software library for encoding video streams into the H.264/MPEG-4 AVC format. It is released under the terms of the GNU General Public License.

# cd /opt
# git clone git://
# cd x264
# ./configure –prefix=”$HOME/ffmpeg_build” –bindir=”$HOME/bin” –enable-static
# make
# make install

10) Configure Libraries

# export LD_LIBRARY_PATH=/usr/local/lib/
# echo /usr/local/lib >> /etc/
# ldconfig (:::It configures dynamic linker run-time bindings)
11) Now compile FFMPEG

# cd /opt
# git clone git://
# cd ffmpeg
# git checkout release/2.2
# PKG_CONFIG_PATH=”$HOME/ffmpeg_build/lib/pkgconfig”

(((Following compile options have to given line by line)))

# ./configure –prefix=”$HOME/ffmpeg_build” –extra-cflags=”-I$HOME/ffmpeg_build/include” –extra-ldflags=”-L$HOME/ffmpeg_build/lib” –bindir=”$HOME/bin” \
–extra-libs=-ldl –enable-version3 –enable-libopencore-amrnb –enable-libopencore-amrwb –enable-libvpx –enable-libfaac \
–enable-libmp3lame –enable-libtheora –enable-libvorbis –enable-libx264 –enable-libvo-aacenc –enable-libxvid –disable-ffplay \
–enable-gpl –enable-postproc –enable-nonfree –enable-avfilter –enable-pthreads

(((The –arch=x86_64 option should only be used if you are on a 64Bit System!)))

# make
# make install


An error you might come across while compiling FFMPEG

Error: libfaac not found
# cd /opt
# wget
# cd faac-1.28
# ./configure –prefix=”$HOME/ffmpeg_build” –disable-shared
# make
# make install

Then compile ffmpeg again in step 11.
Some error you encounter after compilation
# ffmpeg -version
ffmpeg: error while loading shared libraries: cannot open shared object file: No such file or directory

For this,

# ldd `which ffmpeg` => (0x00872000) => /lib/ (0x07533000) => /usr/lib/ (0x00110000) => /lib/ (0x007e7000) => not found => /usr/lib/ (0x00f68000) => /usr/lib/ (0x00a3a000) => /usr/lib/ (0x001b0000) => /lib/ (0x0082b000) => /lib/ (0x00816000) => /lib/ (0x0080b000) => /lib/ (0x00804000) => /lib/ (0x0065a000)
/lib/ (0x00638000) => /usr/lib/ (0x07afb000) => /lib/ (0x077af000)

# find / -iname

# ln -s /root/ffmpeg_build/lib/ /lib/

# ll /lib/
lrwxrwxrwx. 1 root root 40 Aug 9 17:37 /lib/ -> /root/ffmpeg_build/lib/
Finally you are done with FFMPEG installation 🙂

# ffmpeg -version
ffmpeg version n2.2.6
built on Aug 7 2014 17:44:37 with gcc 4.4.5 (GCC) 20101112 (Red Hat 4.4.5-2)
configuration: –prefix=/root/ffmpeg_build –extra-cflags=-I/root/ffmpeg_build/include –extra-ldflags=-L/root/ffmpeg_build/lib –bindir=/root/bin –extra-libs=-ldl –enable-version3 –enable-libopencore-amrnb –enable-libopencore-amrwb –enable-libvpx –enable-libfaac –enable-libmp3lame –enable-libtheora –enable-libvorbis –enable-libx264 –enable-libvo-aacenc –enable-libxvid –disable-ffplay –enable-gpl –enable-postproc –enable-nonfree –enable-avfilter –enable-pthreads
libavutil 52. 66.100 / 52. 66.100
libavcodec 55. 52.102 / 55. 52.102
libavformat 55. 33.100 / 55. 33.100
libavdevice 55. 10.100 / 55. 10.100
libavfilter 4. 2.100 / 4. 2.100
libswscale 2. 5.102 / 2. 5.102
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100


See complete list of ffmpeg options using # ffmpeg -h full | less
Now I am just showing, how to convert a video type to another format. I am converting a mp4 video to avi

# ffmpeg -i my_video.mp4 my_video.avi
ffmpeg version n2.2.6 Copyright (c) 2000-2014 the FFmpeg developers
built on Aug 7 2014 17:44:37 with gcc 4.4.5 (GCC) 20101112 (Red Hat 4.4.5-2)
configuration: –prefix=/root/ffmpeg_build –extra-cflags=-I/root/ffmpeg_build/include –extra-ldflags=-L/root/ffmpeg_build/lib –bindir=/root/bin –extra-libs=-ldl –enable-version3 –enable-libopencore-amrnb –enable-libopencore-amrwb –enable-libvpx –enable-libfaac –enable-libmp3lame –enable-libtheora –enable-libvorbis –enable-libx264 –enable-libvo-aacenc –enable-libxvid –disable-ffplay –enable-gpl –enable-postproc –enable-nonfree –enable-avfilter –enable-pthreads
libavutil 52. 66.100 / 52. 66.100
libavcodec 55. 52.102 / 55. 52.102
libavformat 55. 33.100 / 55. 33.100
libavdevice 55. 10.100 / 55. 10.100
libavfilter 4. 2.100 / 4. 2.100
libswscale 2. 5.102 / 2. 5.102
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ‘my_video.mp4’:
major_brand : FACE
minor_version : 1337
compatible_brands: isomavc1FACE
creation_time : 2013-01-18 03:43:54
Duration: 00:00:59.23, start: 0.000000, bitrate: 325 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 400×224, 230 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
creation_time : 2013-01-18 03:43:54
handler_name : /tmp/tmpIZkUUJ/540138109343874.mp4_video.264 – Imported with GPAC 0.4.6-DEV-rev3544
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 93 kb/s (default)
creation_time : 2013-01-18 03:43:54
handler_name : /tmp/tmpIZkUUJ/540138109343874.mp4_audio.aac – Imported with GPAC 0.4.6-DEV-rev3544
Output #0, avi, to ‘my_video.avi’:
major_brand : FACE
minor_version : 1337
compatible_brands: isomavc1FACE
ISFT : Lavf55.33.100
Stream #0:0(und): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 400×224, q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc (default)
creation_time : 2013-01-18 03:43:54
handler_name : /tmp/tmpIZkUUJ/540138109343874.mp4_video.264 – Imported with GPAC 0.4.6-DEV-rev3544
Stream #0:1(und): Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 44100 Hz, stereo, fltp (default)
creation_time : 2013-01-18 03:43:54
handler_name : /tmp/tmpIZkUUJ/540138109343874.mp4_audio.aac – Imported with GPAC 0.4.6-DEV-rev3544
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> mpeg4)
Stream #0:1 -> #0:1 (aac -> libmp3lame)
Press [q] to stop, [?] for help
frame= 1773 fps=182 q=9.1 Lsize= 2725kB time=00:00:59.24 bitrate= 376.8kbits/s
video:1694kB audio:926kB subtitle:0 data:0 global headers:0kB muxing overhead 4.021155%



You are good to go now 🙂


CHECK_NRPE: Error – Could not complete SSL handshake

If you find this error in nagios for a particular server, this means nothing but the nrpe check from nagios server cannot able to complete the service check to client server.

You can check this through command line itself, run the following in nagios server.

# /usr/local/nagios/libexec/check_nrpe -H hostnameORclientserverIP -c check_load
CHECK_NRPE: Error – Could not complete SSL handshake.

You may need to cover different scenarios for this to troubleshoot.

1) Check if the particular check is available in client server (For example, check_load, 3ware_check, mail_count etc)

2) Check if xinetd or nrpe stopped running,otherwise try to restart it.

# /etc/init.d/xinetd restart
# /etc/init.d/nrpe restart

3) Make sure you allowed the nagios IP in /etc/xinetd.d/nrpe if nrpe is running under xinetd,like as getting in netstat result.

# netstat -plan | grep :5666
tcp 0 0* LISTEN 25022/xinetd

Check the parameter “only_from” in this file whether allowed nagios IP there.

Then restart xinetd

# /etc/init.d/xinetd restart


Make sure you allowed the nagios IP in /etc/nagios/nrpe.cfg if nrpe is not running under xinetd and as nrpe user itself, like as getting in netstat result.

# netstat -plan | grep :5666
tcp 0 0* LISTEN 248184/nrpe

Make changes to value of parameter “allowed_hosts” in /etc/nagios/nrpe.cfg to as shown below


Then restart nrpe

# /etc/init.d/nrpe restart

4) Try to whitelist nagios server IP in firewall.


cloudlinux: PHP selector NOT working or BROKEN

It was truly devastating and I was dismayed when I noticed the PHP selector in server got broken or stopped working since the last easy-apache. Tones of tickets were popped in when clients lost their custom php versions and its custom settings

I tried to select the php version 5.4 for the domain and set post_max_size and upload_max_filesize to 32MB each







And I checked by putting a phpinfo page in the domain, sadly the changes I made in php selector settings had no effect








Following is the solution that I could finally find out to fix it … tadaa 🙂

PHP configured as suphp in server
# /usr/local/cpanel/bin/rebuild_phpconf –current
Available handlers: suphp dso fcgi cgi none
PHP4 SAPI: none
PHP5 SAPI: suphp
SUEXEC: enabled
RUID2: not installed

We must check if is present in /opt/suphp/sbin/suphp since it is suphp compiled with lve. In this case Cagefs and PHPSelector can’t work properly. You can check this by searching file /opt/suphp/sbin/suphp . Use strings command to read it since it is a binary file.

# strings /opt/suphp/sbin/suphp | grep lve

Output should be as…

# strings /opt/suphp/sbin/suphp |grep lve
Could not resolve path “

If it is not present, then you need to run:

# /usr/sbin/

Then force update cagefsctl to update alt_php.ini of all individual users in server.

# cagefsctl –force-update

Now see my changes 🙂









This should solve your issue

Proper Method To Change Default Mysql Engine Permanently

Here the mysql engine is set to InnoDB by default and I want to change it to MyISAM for long run. It was the old way setting parameter “skip-innodb” and commenting “innodb_file_per_table=1” in my.cnf file. Additionally we used to execute mysql query “SET storage_engine=MYISAM;”. Now a days, the above changes wont work and perhaps the mysql server doesn’t come back after initiating a restart since the changes made. The proper method is set the variable “default-storage-engine = MyISAM” like my mysql configuration as follows:

<> ~> cat /etc/my.cnf
default-storage-engine = MyISAM
#innodb_force_recovery = 4

Nothing else you need to do 🙂
Now restart mysql server and check the default engine is set to what

<> ~> /etc/init.d/mysql restart
Shutting down MySQL. [ OK ]
Starting MySQL. [ OK ]

mysql> show engines;
| Engine | Support | Comment | Transactions | XA | Savepoints |
| MyISAM | DEFAULT | MyISAM storage engine | NO | NO | NO |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL |
| InnoDB | NO | Supports transactions, row-level locking, and foreign keys | NULL | NULL | NULL |
9 rows in set (0.00 sec)

If you want to enable InnoDB as well along with default MyISAM engine, then comment out the variable skip-innodb and remove comment before variable innodb_file_per_table=1

Re-setup and configure the broken WiFi network in RHEL/CentOS/Fedora

Recently I installed CentOS on my VAIO laptop and I had to do some further up-gradation of outdated packages, but that shoved me into a real headache. The WiFi network was working good till starting the upgradation procedure, but stopped right after completing the process. I had no idea then about how this was happened. I was getting only the following information from ifconfig

wlan0 Link encap:Ethernet HWaddr A4:17:31:E0:B6:47
inet6 addr: fe80::a617:31ff:fee0:b647/64 Scope:Link
RX packets:95834 errors:0 dropped:0 overruns:0 frame:0
TX packets:73355 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:119240792 (113.7 MiB) TX bytes:9640456 (9.1 MiB)

and from iwconfig

wlan0 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off

Sadly no IP Address or anything received from the DSL Modem. I tried to restart network and NetworkManager services and the dhclient as well. But those did not change the situation. I checked /var/log/messages for system messages and dmesg for kernel messages and got the following ones.

Jan 20 12:12:29 john NetworkManager[2042]: error requesting auth for (35) Remote Exception invoking org.freedesktop.PolicyKit1.Authority.CheckAuthorization() on /org/freedesktop/PolicyKit1/Authority at name org.freedesktop.PolicyKit1: org.freedesktop.DBus.Error.Spawn

ADDRCONF(NETDEV_UP): wlan0: link is not ready

It was fully doubtful for me if the wifi device got undetected or lost its driver module itself in running kernel. But it was indeed a relaxation result from lspci and lsmod since the wifi device was already there in place and the running kernel still has the wifi adapter modules kept with it.

<> ~> lspci -v | grep -A 12 Wireless
07:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)
Subsystem: Foxconn International, Inc. Device e044
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at c1200000 (64-bit, non-prefetchable) [size=512K]
Expansion ROM at c1500000 [disabled] [size=64K]
Capabilities: [40] Power Management version 2
Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+
Capabilities: [70] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
Kernel driver in use: ath9k
Kernel modules: ath9k

<> ~> lsmod | grep ath9k
ath9k 91969 0
mac80211 552581 1 ath9k
ath9k_common 3193 1 ath9k
ath9k_hw 408176 2 ath9k,ath9k_common
ath 18078 3 ath9k,ath9k_common,ath9k_hw
cfg80211 619515 3 ath9k,mac80211,ath

Finally I did use the tool iwlist to reestablish the wifi network manually. For that, first install the tool

<> ~> yum -y install wireless-tools

<> ~> ifconfig wlan0 up

<> ~> iwlist wlan0 scan

<> ~> iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 – Address: 1C:7E:E5:0B:D0:E9
Frequency:2.412 GHz (Channel 1)
Quality=33/70 Signal level=-77 dBm
Encryption key:off
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Extra: Last beacon: 92ms ago
IE: Unknown: 0005444C696E6B
IE: Unknown: 010882848B962430486C
IE: Unknown: 030101
IE: Unknown: 2A0100
IE: Unknown: 2F0100
IE: Unknown: 32040C121860
IE: Unknown: 2D1A6C181BFF00000000000000000000000000000000000000000000
IE: Unknown: 3D1601000400000000000000000000000000000000000000
IE: Unknown: DD090010180202F0040000
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00

Now configure wlan0 with the above information


<> ~> iwconfig wlan0 essid DLink key off

(((ESSID:”DLink” and Encryption key:off in the iwlist scan result)))

Then start the dhcpclient for wlan0

<> ~> dhclient wlan0

You are done 🙂

from dmesg

ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

<> ~> ifconfig | grep -A 7 wlan0
wlan0 Link encap:Ethernet HWaddr A4:17:31:E0:B6:47
inet addr: Bcast: Mask:
inet6 addr: fe80::a617:31ff:fee0:b647/64 Scope:Link
RX packets:104499 errors:0 dropped:0 overruns:0 frame:0
TX packets:80783 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:126639447 (120.7 MiB) TX bytes:11239675 (10.7 MiB)

<> ~> iwconfig
wlan0 IEEE 802.11bgn ESSID:”DLink”
Mode:Managed Frequency:2.412 GHz Access Point: 1C:7E:E5:0B:D0:E9
Bit Rate=1 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=43/70 Signal level=-67 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:11 Missed beacon:0

If you don’t want to repeat these steps each time when you start the system, then you can set those in a single script file as follows:

<> ~> cat /root/
#This is to bring up wifi at the startup
ifconfig wlan0 up
iwconfig wlan0 essid DLink key off
sleep 5
dhclient wlan0

<> ~> chmod +x /root/

Then set the command sh /root/ in file /etc/rc.local or /etc/rc.d/rc.local inorder to establish wifi network along with all the run levels while system booting process.

Lost dual boot option and need to reinstall grub

The steps in this post are applicable to be done in distributions like Redhat, Centos and Fedora.

Recently I met with an issue like my personal desktop has lost its Dual Boot option at the startup. The machine has been working by having both Windows XP and Centos present in it. The dual boot option has been lost ever since I reinstalled Windows XP. I was not able to choose Centos at the startup from then, and the machine was automatically booting to Windows XP once I power on the CPU. It was pretty sure that I would probably need to reinstall grub in Centos to bring back the Dual Boot option.

Here you go with the steps I tried to reinstall grub in Centos.

Put in the installation CD you used to install Centos in your machine.
(Before that log into BIOS and set CD/DVD Drive in first place of Boot Priority list)

– Press F10(Save your BIOS change and exit inorder to reboot) and on the reboot cycle, machine would load your Centos disk. That means your Centos disk should be present prior to the booting of machine, otherwise it would try to load the from Harddrive.
– Select “Rescue installed system”.
– Select “Local CDDVD” for the Rescue Method.
– On the “Rescue Screen”, select “Continue”.
– On the next menu screen, select “shell Start shell”.
– I got the shell as “bash-4.1#” successfully.
– Then I tried to run “chroot /mnt/sysimage” and hit the following error.

chroot: failed to run command `/bin/bash’: No such file or directory

The above error indicates that either you have put in a different architecture CD that doesn’t match the one installed in your machine. Mine is Centos 6.4 i686 and I was using the same disk used to installed it, so that wasn’t issue here.

Finally I found “chroot /mnt/sysimage” was not working and not shifting me into chroot environment, because “/” and “/boot” partitions were not mounting as well. I had to proceed with manual steps in the following way.

My fdisk -l result is

bash-4.1# fdisk -l
omitting empty partition (5)

Disk /dev/sda: 80.0GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x332cf22a

Device Boot Start End Blocks Id System
/dev/sda1 * 1 2550 20482843+ 7 HPFS/NTFS
/dev/sda2 2551 9728 57657285 f W95 Ext’d (LBA)
/dev/sda3 5738 9728 32057676 7 HPFS/NTFS
/dev/sda5 2551 2576 204800 83 Linux
/dev/sda6 2576 5476 23294976 83 Linux
/dev/sda7 5476 5737 2096128 82 Linux swap / Solaris

/dev/sda6 is my “/” partition and “/dev/sda5” is the “/boot” partition.

I mounted “/” and “/boot” partitions manually and chrooted it.

bash-4.1# mkdir /mnt/ROOT
bash-4.1# mount -t ext4 /dev/sda6 /mnt/ROOT
bash-4.1# mount -t ext4 /dev/sda5 /mnt/ROOT/boot

bash-4.1# chroot /mnt/ROOT
you will be switched to chroot environment >> sh-4.1#


I tried to run fdisk -l , but got the below error:

sh-4.1# fdisk -l
cannot open /proc/partitions

I exit from the chroot and mounted /proc and /dev using bind method.

sh-4.1# exit
bash-4.1# mount -o bind /proc /mnt/ROOT/proc
bash-4.1# mount -o bind /dev /mnt/ROOT/dev

chroot again

bash-4.1# chroot /mnt/ROOT
sh-4.1# fdisk -l
omitting empty partition (5)

Disk /dev/sda: 80.0GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x332cf22a

Device Boot Start End Blocks Id System
/dev/sda1 * 1 2550 20482843+ 7 HPFS/NTFS
/dev/sda2 2551 9728 57657285 f W95 Ext’d (LBA)
/dev/sda3 5738 9728 32057676 7 HPFS/NTFS
/dev/sda5 2551 2576 204800 83 Linux
/dev/sda6 2576 5476 23294976 83 Linux
/dev/sda7 5476 5737 2096128 82 Linux swap / Solaris

Now install grub

sh-4.1# grub-install /dev/sda
The file /boot/grub/stage1 not read correctly.

Made me crazy again 🙂
and did it manually from grub prompt.

sh-4.1# grub
Probing devices to guess BIOS drives. This may take a long time.

GNU GRUB version 0.97 (640K lower / 3072K upper memory)

[ Minimal BASH-like line editing is supported. For the first word, TAB
lists possible command completions. Anywhere else TAB lists the possible
completions of a device/filename.]

grub> find /boot/grub/stage1

grub> root (hd0,5)
Filesystem type is ext2fs, partition type 0x83

grub> setup (hd0)
Checking if “/boot/grub/stage1” exists… yes
Checking if “/boot/grub/stage2” exists… yes
Checking if “/boot/grub/e2fs_stage1_5” exists… yes
Running “embed /boot/grub/e2fs_stage1_5 (hd0)”… 15 sectors are embedded.
Running “install /boot/grub/stage1 (hd0) (hd0)1+15 p
/boot/grub/grub.conf”… succeeded

grub> quit

Make corrections to (hd0,5) in the file /etc/grub.conf or /boot/grub/grub.conf and this is MANDATORY.

sh-4.1# exit
bash-4.1# reboot

Issue has been fixed 🙂










This can also be done using a Live CD with same OS and architecture.

– Boot to CD/DVD Drive
– Select “Rescue Installed System”

You will be shifting to Live CD environment

[root@livecd ~]#

just mount the /boot partition and install grub like as follows:

[root@livecd ~]# mkdir /oldboot
[root@livecd ~]# mount /dev/sda5 /oldboot (/dev/sda5 is my /boot partition here)
[root@livecd ~]#
[root@livecd ~]# grub-install –root-directory=/oldboot /dev/sda
Installation finished. No error reported.
This is the contents of the device map /oldboot/boot/grub/
Check if this is correct or not. If any of the lines is incorrect,
fix it and re-run the script `grub-install’.

# this device map was generated by anaconda

(fd0) /dev/fd0
(hd0) /dev/sda






You are done 🙂