Installing Gephi On 64 bit Machines

July 8, 2013

The instructions for installing Gephi can be found at:

https://gephi.org/users/install/

They seem simple enough. But I found out that on a 64 bit server, it’s really important that you have a full 64/64/64 bit combination. That represents the operating system, Java, and Gephi. Here are some hints to get it right.


Java
:

Be sure to download the right java file.   Read the rest of this entry »


Installing NVidia Drivers on Redhat 6.4 and Removing Nouveau

July 7, 2013

Recently I’ve been working with the graph database, NEO4J. Much of the usefulness of graph software is in visualizing it. So, I decided to install Gephi on Redhat 6.4. Gephi installed on Redhat easily enough. But it did not display the most important thing, the graph window!  :(

Gephi With No Graph Section

Gephi With No Graph Section

Debugging Gephi:

The Gephi website says:  “Gephi uses an OpenGL 3D engine to speed up graph visualization. However a compatible graphic card is required.”

Here’s how you can add some debugging to Gephi. Read the rest of this entry »


OBIEE 11.1.1.6.2 BP1 SampleApp v207 on Virtual Box 4.2.12

July 6, 2013

You might have read of how long and complex it is to install OBIEE directly onto Redhat.

OBIEE SampleApp v207 Desktop

OBIEE SampleApp v207 Desktop

This year I heard that there was a new Virtual Box image of OBIEE. The idea being: you install and start Virtual Box, then use the OBIEE virtual machine. Great idea. You should be able to get on with actually using OBIEE, not struggling with its installation, startup, and administration.

However, that would assume that all the components work. Like any technology stack.

Unfortunately for me, they did not.

Installing Virtual Box 4.2.12 r84980:    Read the rest of this entry »


At Least Nine Ways To Identify Hard Disks

June 25, 2013

After writing the long post, Secrets of BIOS, Grub, and Triple Boot Servers, I still had some notes left over.

Here’s some more detailed info on the many different ways that hard drives are identified in my server using: Phoenix BIOS, ASUS BIOS 1006, Sept 1, 2008. There are at least 9 different properties or ways to identify them.

Disk Drive Model Name WD10 Hitachi WD400
Hard Disk 3 4 5
Fixed Disk 0 1 2
Sata Port 2 3 4
IDE 3 4 5
BIOS Boot Order 2 3 1
Grub HD? (hd1) (hd2) (hd0)
Operating System Windows 7 Redhat 5.5 Redhat 6.4
/dev/sd? /dev/sdb /dev/sda /dev/sdc

Make sense? Quick, how many can you recall?

Note: Redhat 6.4 is the main boot disk. After booting Redhat 6.4, the /dev/sd? is what is indicated by running fdisk -l. Please read the previous post for the details.


Secrets of BIOS, Grub, and Triple Boot Servers

June 9, 2013

Have you read: Rodger’s Very Simple Dual Boot Method?

If you haven’t already, do check it out. One advantage: no Master Boot Record (MBR) modifications! Another advantage: it allows all disks and operating systems the option to be completely independent of each other. You can remove any disk, insert it into another machine, and it will boot perfectly fine. The disks are no longer married to each other. But mainly, this post won’t make any sense to you, otherwise.

A few months ago, I used this method with only two operating systems: Redhat 5.5 and Windows 7. Then recently, in the same server, I installed Redhat 6.4 onto a third disk. But suddenly I had an awful time getting all three to work.

Symptoms:

Redhat 6.4 booted Redhat 5.5 perfectly. But when I booted Windows from the Redhat 6.4 grub.conf file, I got the error:

File:  \BOOT\BCD
Status:  0xc0000001
Info:  An error occurred while attempting to read the boot configuration file

Redhat 5.5 booted Windows 7 perfectly. But when I tried to boot Redhat 6.4 from the Redhat 5.5 grub.conf file, I got the error:

Error 2: Bad file or directory type

So, I could only boot two of the three operating systems at one time.  To make things work, I’d have to be changing sata cables. That really defeated the purpose of a triple boot.

This was really mysterious, and no one on the newsgroups had any idea how to fix it. Mere mortals would have given up and implemented some kind of work around. :) But here is how I ultimately overcome the errors and got all the three disks to boot cleanly.  Read the rest of this entry »


Rodger’s Very Simple Dual Boot Method

February 20, 2013

Yesterday, I blogged how to add a Windows hard disk to a Linux installation. I noted, it’s relatively easy to add a Linux disk to a Windows installation, and how the Windows MBR gets overwritten by Linux. But it’s harder to add a Windows disk to an existing Linux installation. The whole process with Supergrub was rather complex, and required many slow reboots.

After thinking about it, a much simpler and effective method came to me. And it works!

In a sentence, the trick is to just modify the boot order in the BIOS, and add the Windows disk to grub.conf. Here’s how to do it.
Read the rest of this entry »


Adding A Windows Hard Disk To A Linux Server

February 19, 2013

It’s relatively easy to add a Linux disk to a Windows machine. But it’s not as easy to add a Windows disk to a Linux machine.

I have a powerful Linux server that I spent a number of weeks installing software on. When I configured it, I decided to make it a dedicated Linux server. However, a lot of software actually works on Windows. I’ve considered virtual machines. But if you have read my escapades with Virtual Box, a dual boot just makes one less variable and software to be concerned with.

In the past, I’ve created a number of Windows/Linux dual boot machines, and the order of operations was pretty easy. First, install Windows on disk 1. Then install Linux on disk 2. Installing Linux will install grub, update the Master Boot Record (MBR) on disk 1, and give a choice of Windows or Linux when booting.

But this time the order of operations was reversed, and Linux was installed first. Since it took so long to install all the software on Linux, I didn’t want to modify anything on the Linux disk. If there was a problem, I wanted to put it back to the way it was; just remove the Windows disk, and boot Linux as before.

So, the requirements were: Install Windows on a second disk. Get the machine to dual boot, without modifying any of the existing Linux install. Allow for rollback.

————-

At first, I tried using EasyBCD for a few hours. But I was unable to figure out a solution. On the forums, there were no responses to my question on how to accomplish my task.

Eventually, I got this to work using two methods. The first was to use an older version of SuperGrub. The second method was to use Linux commands. In both cases, I had to get to the Linux OS using either Supergrub, or Supergrub2.
Read the rest of this entry »


VMWare Player Versus Virtual Box: One Works, The Other Doesn’t

February 17, 2012

Trying to get a Virtual Machine to work on 64 bit Redhat 5.5?  You may want to read these reviews of Virtual Box, and VMWare Player first.

Virtual Box:

Over many hours over a number of weeks, I struggled to install Virtual Box on 64 bit Redhat 5.5. Please read about these struggles first. It was version:

rpm -qa | grep -i “virtual”
VirtualBox-4.1-4.1.8_75467_rhel5-1

I’ve also installed the extension pack.
4.1.8 r75467

Interestingly, Virtual Box does not have a simple –version or -v flag!  Unlike the majority of commands and RPMs on Linux.

You can see the struggle I had just to install Virtual Box in another post. Four very fundamental things were documented wrong, or not documented at all! Surprise! Finally I got it installed.

Then I tried to create a Windows XP virtual machine. But Virtual Box just didn’t want to work.
Read the rest of this entry »


What Version of Weblogic Is It?

January 28, 2012

Ever wonder what version of weblogic is on your server? Here is how to find out.

————-

First, set the environment variables in $DOMAIN_HOME

Read the rest of this entry »


Using NMAP To Find The Ports For Oracle Apps, OBIEE, Listener

January 21, 2012

Not finding a port with netstat? Nmap finds what netstat does not. Nmap can also point out your servers’ vulnerabilities.

On my server, there are a number of applications that work via a browser. Each with an associated port.

Usually, I’ll use netstat to find the port.
netstat -a | grep 9704

You can also find the unix process that is using the port by adding the flag, -al.
netstat -al | grep -i 9704

tcp 0 0 black.testrac.com:9704 *:* LISTEN oracle 162677
tcp 0 0 fe80::200:ff:fe00:0:9704 *:* LISTEN oracle 162676
tcp 0 0 ::ffff:192.168.122.1:9704 *:* LISTEN oracle 162675
tcp 0 0 localhost.localdomain:9704 *:* LISTEN oracle 162674
tcp 0 0 localhost6.localdomain:9704 *:* LISTEN oracle 162673
tcp 0 0 fe80::223:54ff:fe73:5f:9704 *:* LISTEN oracle 162672
tcp 0 0 black.testrac.com:49854 black.testrac.com:9704 ESTABLISHED
tcp 0 0 black.testrac.com:9704 black.testrac.com:49854 ESTABLISHED

However, netstat doesn’t find a number of processes or ports. Such as these important ports and applications:
1521 – Oracle listener
1158 – enterprise manager
7003 – Oracle Weblogic/OBIEE admin
8000 – Oracle Applications

I always found this really aggravating. I knew the port was in use. Why didn’t netstat find it? Then recently, I discovered that nmap will find the ports that netstat does not.
Read the rest of this entry »


Overcoming Oracle Apps R12 FRM-92101 Error On Redhat Linux 5.5

January 21, 2012

Have you ever got the error, FRM-92101 on with Oracle Applications R12 on 64 bit Redhat Linux 5.5? Here is how to overcome it.

Oracle Forms Runtime Error FRM92101

Oracle Forms Runtime Error FRM92101

Read the rest of this entry »


Firefox, Oracle Apps, Java plugins, on 64 Bit Redhat 5.5

January 20, 2012

When using Firefox on Linux, have you ever got the aggravating message concerning oaj2se.exe, or NPX_PLUGIN_PATH? Here is the solution.

From what I have read, on Linux, using the Firefox browser for Oracle Forms is not certified. At least it wasn’t in the past. Bizarre.

———–

Symptom:

On Redhat Linux, you try working with an app such as Oracle Apps, and navigate to where the software takes you. But you suddenly get the error message:

In order to access this application, you must install the J2SE Plugin version 1.6.0_07 on your client and NPX_PLUGIN_PATH environment variable is set before starting Netscape. To install this plugin, click here to download the oaj2se.exe executable. Once the download is complete, double-click the oaj2se.exe file to install the plugin. You will be prompted to restart your browser when the installation is complete.

———–

The problem is, oaj2se.exe is an executable that only works on Windows.
Read the rest of this entry »


Mobaxterm vs Xming: Remote Connections to Redhat 5.5

January 15, 2012

Putty, Sqlplus, and Cygwin:

I’m often working with my laptop. And I use putty and sqlplus to connect to the server. They both work fabulous! First time, every time. Do exactly as they are told. No surprises. Very reliable. And you can do most everything that you need to do.

I’ve also used cygwin for years, and have it installed on all my Windows machines. Although the cygwin installation could use improvement. Such as a button for: Install every last thing! Currently, installing everything requires a LOT of mouse clicks!

It’s such a pleasure to work with software that works right out of the box.   No wonder I use putty,  sqlplus, and cywin so much.

X Windows:

Recently I figured I would just install some X Windows software to connect to the 64 bit Redhat 5.5 Linux server. Shouldn’t take long. Yeah right.
Read the rest of this entry »


Installing Virtual Box 4.1-4 on 64 bit Redhat 5.5

January 9, 2012

Recently I installed Virtual Box 4.1-4 on Redhat 5.5 64 bit. It was a painful experience with some serious Gotchas.  The install docs were confusing. They are probably fine for people already quite familiar with the product. But not for newbies.

————-

xen:

One critical issue with Redhat Oracle and Virtual Box is that: VIRTUAL BOX WILL NOT RUN IN AN XEN ENVIRONMENT.

“xen” is not found in the install doc.     Nor in the table of contents.

Read the rest of this entry »


Commands To Show The Linux Version. Let the count the ways!

December 3, 2011

Commands To Show The Linux Version. Let the count the ways.

One thing about Unix and Linux, there are often many ways to do exactly the same thing. And many flags within in each command.  Here’s a quick list I came up with regarding the Linux version. One thing to remember is, there is a difference between the Linux kernel, and the Redhat version.

kernel:

uname -a
Linux black 2.6.18-194.el5xen #1 SMP Mon Mar 29 22:22:00 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

uname -r
2.6.18-194.el5xen

rpm -qa | grep kernel

kernel-headers-2.6.18-194.el5
kernel-xen-devel-2.6.18-194.el5
kernel-xen-2.6.18-194.el5
kernel-debug-2.6.18-194.el5
kernel-2.6.18-194.el5

———–

Redhat Version or Release:

lsb_release -a
LSB Version: :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: EnterpriseEnterpriseServer
Description: Enterprise Linux Enterprise Linux Server release 5.5 (Carthage)
Release: 5.5
Codename: Carthage

osinfo
OperatingSystem Information
Host: black.testrac.com
Name: Enterprise Linux Enterprise Linux Server
( 2.6.18-194.el5xen #1 SMP Mon Mar 29 22:22:00 EDT 2010 )
Version: 2.6.18-194.el5xen
UserLicense: Unlimited user license
Number of Users: 3 users
Number of Processes: 231 processes
OSCapability: 64 bit
LastBootTime: Nov 29, 2011 18:15:53 (-0600)
LocalDateTime: Nov 29, 2011 19:39:01 (-0600)
SystemUpTime: 4987 seconds = 1 hr, 23 mins, 7 secs

cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.5 (Tikanga)

cat /etc/enterprise-release
Enterprise Linux Enterprise Linux Server release 5.5 (Carthage)

cat /etc/issue
Enterprise Linux Enterprise Linux Server release 5.5 (Carthage)
Kernel \r on an \m

cat /proc/version
Linux version 2.6.18-194.el5xen (mockbuild@ca-build10.us.oracle.com) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Mon Mar 29 22:22:00 EDT 2010

———–

What have I missed? How many more ways are there?


Getting domainname to work

December 2, 2011

Trying to set a static IP with a fully qualified domain name on Redhat?  But the command domainname still returns nothing? Here’s what you can do.

Backup the following files, then edit them:

/etc/sysconfig/network-scripts/ifcfg-eth0

IPADDR=192.168.2.201
NETMASK=255.255.255.0
GATEWAY=192.168.2.1
ONBOOT=yes
BOOTPROTO=none
(I’ve also seen “STATIC”, but mine is running with “none”)

/etc/sysconfig/network

NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=black.testrac.com

/etc/resolv.conf
nameserver 192.168.2.1

cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.168.2.201 black.testrac.com black

/etc/nsswitch.conf needs a line:
hosts: files dns

You can also use the GUI tool:
/usr/bin/system-config-network &
to set a number of these parameters

You can then reset the network with commands:

Stop the network:
/etc/init.d/network stop

Start the network:
/etc/init.d/network start

or

/sbin/ifdown eth0
/sbin/ifup eth0

However, I prefer a full reboot to be sure. Recently, I had issues after rebooting that were not presenting themselves before. Turns out that two active ethernet ports are not better than one if the second is not plugged in.

Then double check your results:

ping hostname
ping fully.qualified.hostname.com
ping yahoo.com
route -v
hostname
ifconfig -a

But if your experience is like mine, you still get nothing when you run the command: domainname

Here is the secret to get domainname to work:

edit
/etc/sysctl.conf

add the line:
kernel.domainname=testrac.com

then, reinitialize the settings with:
/etc/sysctl -p

domainname
testrac.com

There, finally!


Best Kept Secret Of Linux – Apropos

November 30, 2011

It always amazes me how many Unix people do not know about the command: apropos. It’s fabulous!

Here’s where it is useful. Say you are struggling with something. You know there is a command for what you are doing, but forget what exactly the command is. Perhaps, how to list the open files. So you run:

apropos file

a2ps (1) – format files for printing on a PostScript printer
a2ps (rpm) – Converts text and other types of files to PostScript(TM).
access (2) – check user’s permissions for a file
access (3p) – determine accessibility of a file
access.conf [access] (5) – the login access control table file
acct (5) – execution accounting file

zip (rpm) – A file compression and packaging utility compatible with PKZIP.
zipsplit [zip] (1) – package and compress (archive) files
zisofs-tools (rpm) – Utilities for creating compressed CD-ROM filesystems.
zless (1) – file perusal filter for crt viewing of compressed text
zlib-devel (rpm) – Header files and libraries for Zlib development.
zmore (1) – file perusal filter for crt viewing of compressed text
znew (1) – recompress .Z files to .gz files

Since linux handles files really well, there are actually a LOT of possibilities for “file”. On my system, over 1600.

apropos file | wc
1640 16328 117382

Configuration files such as .conf are of type (5).

The commands that can be used at the prompt are of type (1), and (8). By adding grep, you can narrow the results. But I still get over 600 possibilities.

apropos file | grep -i -e “(1)” -e “(8)”


vipw (8) – edit the password or group files
virt-xml-validate (1) – validate libvirt XML files against a schema
visudo (8) – edit the sudoers file
vol_id (8) – probe filesystem type and read label and uuid
wbmptopbm (1) – convert a wireless bitmap (wbmp) file to a PBM
wc (1) – print the number of newlines, words, and bytes in files
webalizer (1) – A web server log file analysis tool
whereis (1) – locate the binary, source, and manual page files for a command
writelog (8) – add a entry to an INN log file

At this point, you can scan visually. Or, use grep some more.

apropos file | grep -i -e “(1)” -e “(8)” | grep -i “open”

gimp-remote [gimp-remote-2] (1) – tells a running GIMP to open a (local or remote) image file
lsof (8) – list open files

Right! lsof! Of course!

makewhatis:
(catman)

Before apropos is useful, you have to run the command: makewhatis

makewhatis (8) – Create the whatis database

makewhatis creates the whatis database, by reading key sections of all the man pages. When I worked on Sun Microsystems operating systems, I remember the equivilent command was catman. Either will take a number of minutes to finish. It’s write once, read many, so you just need to do it the once.

whatis:

Then, you can also use the command: whatis. This is useful when you are instructed to use a command online you haven’t seen before. Before running the command, you can check what it does.

whatis vfs_catia
vfs_catia (8) – translate illegal characters in Catia filenames

Other useful commands that I use include, which and file.

which:

which will tell where exactly a file is located in your search path:

which sysctl
/sbin/sysctl

file:

file will tell you what type of file it is:

file /sbin/sysctl
/sbin/sysctl: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped

There are many types of files:

file /etc/*

/etc/rc5.d: symbolic link to `rc.d/rc5.d’
/etc/rc6.d: symbolic link to `rc.d/rc6.d’
/etc/rc.d: directory
/etc/rc.local: symbolic link to `rc.d/rc.local’
/etc/rc.news: Bourne shell script text executable
/etc/rc.sysinit: symbolic link to `rc.d/rc.sysinit’
/etc/readahead.d: directory
/etc/reader.conf: ASCII English text

You then always can use the man pages for more info. Go to SEE ALSO for related commands.

One of my beefs about the man pages is that they often tell me everything, except what I need to know. In fact, for apropos, the critical fact that you need to first run makewhatis is not found at all in SEE ALSO. Perhaps that’s why it’s not used much.

Usually I just need a simple example that works. I find I get much better info from blogs these days. Why can’t those who write man pages do similar?

Using apropos has allowed me learn many things about unix and linux that I would not have discovered otherwise. You can spend a lot of time with it, and learn heaps.


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