Linux: VMWare tools problem: "host software version may not be compatible with the upgrader"

If you run vmware-tools-upgrader-64 to install/upgrade your VMWare tools on your VM and you get the error:


Starting Tools Upgrader
RpcIn: Registering callback 'reset'
RpcIn: Registering callback 'ping'
RpcIn: Registering callback 'Capabilities_Register'
RpcIn: Registering callback 'upgrader.run'
RpcIn: Registering callback 'upgrader.cancel'
HgfsChannelGuest_Init: app tools-upgrader rpc = 0 rpc cb = 0.
HgfsChannelInitServer: Initialize Hgfs server.
HgfsChannelInitChannel: Init channel return 1.
HgfsChannelGuestBdInit: guest initialized.
RpcIn: Registering callback 'f'
Upgrader: To VMX: tools.capability.hgfs_server tools-upgrader 1
Rpci: Sending request='tools.capability.hgfs_server tools-upgrader 1'
Rpci: Sent request='tools.capability.hgfs_server tools-upgrader 1', reply='', len=0, status=1
Upgrader: To VMX: upgrader.setGuestFileRoot /tmp/vmware-root/296113e0/
Rpci: Sending request='upgrader.setGuestFileRoot /tmp/vmware-root/296113e0/'
Rpci: Sent request='upgrader.setGuestFileRoot /tmp/vmware-root/296113e0/', reply='Failed', len=6, status=1
RPC greeting failed: Host software version may not be compatible with the Upgrader.
Setting temp directory root failed.
Upgrader failed initialization.
Upgrader: To VMX: tools.capability.hgfs_server tools-upgrader 0
Rpci: Sending request='tools.capability.hgfs_server tools-upgrader 0'
Rpci: Sent request='tools.capability.hgfs_server tools-upgrader 0', reply='', len=0, status=1
RpcIn: Unregistering callback 'f'
HgfsChannelGuest_Exit: app tools-upgrader rpc = 0 rpc cb = 0 chn = 7F42C8489060.
HgfsChannelExitServer: Teardown Hgfs server.
HgfsChannelExitChannel: Exit channel returns.


it means you need to do some extra work to install the VMWareTools ;)

The solution is to unpack manually the tar file and run the installer:


tar xvf VMwareTools-10.0.10-4301679.tar.gz # actual version could be different

cd  vmware-tools-distrib

run (as ROOT) the command

 ./vmware-install.pl


Done!

Oracle-XE Configuration failes.

I installed today Oracle XE on SUSE 11 and I got this error during configuration:


Database Configuration failed. Look into /u01/app/oracle/product/11.2.0/xe/config/log for details

In the files in /u01/app/oracle/product/11.2.0/xe/config/log

there were these errors:

ORA-00119: invalid specification for system parameter LOCAL_LISTENER
ORA-00130: invalid listener address '(ADDRESS=(PROTOCOL=TCP)(HOST=linux-jbzk.site)(PORT=1521))'


The problem was on my machine the hostname was not pingeable.

Solution:

Add your current hostname (output of echo $HOSTNAME) to your /etc/hosts file

For example if your hostname is linuxbox :


127.0.0.1    linuxbox


Then you can re-run the oracle configuration:

/etc/init.d/oracle-xe configure


Source
https://community.oracle.com/

The Most Difficult Program to Compute? Meet the Ackermann function

The Most Difficult Program to Compute?
Meet the Ackermann function. Fascinating subject :)

 by Computerphile 

 

How to change bash prompt to red when you are root

To change your bash shell prompt to red when you became root,  do the following:

• login as root
• vi ~/.bashrc
• add the this line:  export PS1='\[\e[31m\][root]\[\e[0m\] \W\$'

 That's it!

Useful resources for code Optimization (C/C++/Assembly)

Here some references I find useful when it comes to code optimizations in C++

• A case for strlen (32 bit only!) :  Just to start with a basic example!

 http://strchr.nfshost.com/optimized_strlen_function 

•  Some very well written guides : http://www.agner.org/optimize  A must read!

BSD vs Linux

A really useful reading! A bit old but still highly valuable!

http://www.over-yonder.net/~fullermd/rants/bsd4linux/01

How to delete a Windows Service

To delete a windows Service there is a practical and easy command.
 Open a command prompt and digit the command:


sc delete ServiceName

ServiceName  is the name you see when you open the property tab of a service in Windows.

NOTE

If  "sc delete ServiceName" does not succeed it means you don't have enough privileges to execute this command. In this case open the command prompt as administrator and retry.