System Administrator's Hub: October 2013

Skype Audio Sound issue in Ubuntu 13.10

I am trying to remove total dependency on Windows 7 by using Open Source Ubuntu 13.10. Ubuntu 13.10 (Saucy Salamander) seems quite stable. Except two issue I faced recently with Skype audio problem and Vmware Player(incompatible with kernel 3.1x).

To solve Skype audio issue, below command was helpful.

sudo sed -i 's/^Exec=.*/Exec=env PULSE_LATENCY_MSEC=30 skype %U/' /usr/share/applications/skype.desktop

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Installing VMware Player on Ubuntu 13.10

I mostly choose Vmware Player as virtualization platform. There is one more Virtualization tool available "VitualBox". I have used "VirtualBox" also, but due to lack of networking options I do not prefer to use "VirtualBox".

Vmware Player provides good options for networking like Bridge network, host only and Natted. I prefer to use Natted, as all Guest OS can communicate with each other, with Host OS and with Internet too.

When I started installation of VMware Player in Ubuntu 13.10, I got some errors. When I checked "dmesg" I found that there was segmentation fault error with one of the library file.

I searched on Internet, and then I found that the problem was not with any library file but with the Kernel.

Ubuntu 13.04 is having kernel 3.11.0-12-generic, while VMware do not support this kernel version. So finally searching from some of the forum I found below steps to overcome issue of VMware Player installation on Ubuntu 13.10.

First you need to download VMware player for Ubuntu from Vmware website. I got "VMware-Player-5.0.2-1031769.x86_64.bundle" for me.

Now before we start installation, we need to install prerequisites. Use below command.

sudo apt-get install build-essential linux-headers-$(uname -r)

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Then install Vmware Player using below command.

sudo chmod a+x VMware-Player-5.0.2-1031769.x86_64.bundle && sudo ./VMware-Player-5.0.2-1031769.x86_64.bundle

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You will see progress of installation, and it will finish. But when you start Vmware Player, it will ask to install some modules. When you click on "Install" button, it will show you "Send Crash Report".

Now follow below steps to solve your issue.

	sudo su
	cd /tmp
	wget https://github.com/willysr/SlackHacks/raw/master/vmware/vmware-3.11/vmblock.3.11.patch
	cd /usr/lib/vmware/modules/source
	tar -xvf vmblock.tar
	cd vmblock-only
	patch -p1 < /tmp/vmblock.3.11.patch
	cd ..
	tar -cvf vmblock.tar vmblock-only/
	vmware-modconfig --console --install-all

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Once done, you can start VMware Player without any issue.

Hope this will help, who wants to run VMware Player in Ubuntu 13.10.

Installing Php 5.2 on CentOS/Redhat

When it comes to php installation, most of us will use simple yum utility in CentOS or RedHat Linux. But when you would try to install php using yum, you will notice that it will install latest version of php (5.3 or later) binaries.

But most of the time it has happened that Development team has asked me to install older release of php(php v. 5.2). I have spent so much time in downgrade process of php version, but finally I have figured out how to install older release in few minutes. So below process would help you to install php 5.2 in latest release of CentOS.

So before we start, lets first remove all php packages using below command. You may need to run below command 2-3 times to remove all php packages.

for php-packages in `rpm -qa | grep php`; do rpm -e $php-packages; done

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Once you run above command, you can check with "rpm -qa | grep php" command if still there is any php package is installed.

Now we need to get webtatic repository and install it. You can use below command to download and install webtatic repository.

rpm -Ivh <a href="http://mirror.webtatic.com/yum/centos/5/latest.rpm

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Once you are done with installation, you need to fire below command to install php 5.2 in Centos.

yum --enablerepo=webtatic install php php-common php-dom php-mbstring --exclude=php-*5.3* --exclude=php53*

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Of course you can edit above command to install your desired php library files.

Hope this post would be helpful who wants to install php 5.2 in CentOS.

Alfresco Fetal Error: libdcpr.so+0x1330b Java Crashed

You would have seen java crash error log. This message does not show any information like due to which class or process java crashed. But finally we found that one culprit document we were uploading in Alfresco, which was having "Hindi" characters. So if you come across this kind of error, check your recently uploaded document if it is having language other than English.

Hope this will help!

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007fbcd266430b, pid=8028, tid=140448967481088
#
# JRE version: 6.0_27-b07
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.2-b06 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C [libdcpr.so+0x1330b] signed char+0xbb
#
# An error report file with more information is saved as:
# /opt/alfresco-4.0.1/hs_err_pid8028.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#