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Archive for December 2009

Setting up CentOS 5.4 for laptop/desktop use (work in progress)

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This post list my experience with the post-installation configuration of CentOS 5.4 for desktop usage on my laptop.

SELinux

If not already done during installation I suggest to turn off SELinux especially if you want to use wine (you do if you want to use google picasa). To do this follow the screen shots below

Adding user to sudoers

The first thing to do is to add yourself to the wheel group by editing /etc/group.Do the following:

su

gedit /etc/group

Change the following line:

wheel:x:10:root

to

wheel:x:10:root,useralias

where useralias is to be substituted with your real username. Next edit the sudoers file by excuting the visudo command:

/sbin/visudo

comment out the following line

# %wheel ALL=(ALL) ALL or

#%wheel ALL=(ALL) NOPASSWD: ALL without prompting for password every time the sudo command is run

Next thing to do is to install additional repositories in order to get additional software not present in the official CentOS repos. The additional packages are required for wireless networking, vpn, non-free stuff like adobe reader, flash plug-in, vlc, codecs, TrueType fonts etc. etc.

Additional repos

The CentOS wiki is a good ressource for setting up additional repos. Here’s a brief summary of what I added

  1. DAGs repository for CentOS5. Do the following:sudo rpm --import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt

    sudo rpm -ivh http://apt.sw.be/redhat/el5/en/i386/RPMS.dag/rpmforge-release-0.3.6-1.el5.rf.i386.rpm

  2. Extra Packages for Enterprise Linux (EPEL)sudo rpm -ivh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm
  3. Adobe respository for Adobe reader and flashsudo rpm -ivh http://linuxdownload.adobe.com/linux/i386/adobe-release-i386-1.0-1.noarch.rpm

Now applications from additional repos can be installed from the PackageManager or from the command line using yum

Wireless networking

CentOS 5 does not come with support for the Intel PRO/Wireless 3945ABG in my laptop. The steps required to get wire less networking up with this particular hardware is well described elsewhere(howtoforge). Once the RPMforge repo has been added as described above do

yum install ipw3945d ipw3945-firmware dkms dkms-ipw3945 wpa_supplicant

In contrast to what is described on howtoforge I like the gnome network-manager tool so instead of turning it off (as in the tutorial) I have turned it on

chkconfig NetworkManager on .

I messed a little around with the wireless stuff, but I actually think that the two steps described here should do the trick. Verify that the file /etc/sysconfig/network-scripts/ifcfg-wlan0 looks something like this

# Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection

DEVICE=wlan0

BOOTPROTO=dhcp

ONBOOT=no

HWADDR=00:00:00:00:00:00 # Insert actual MAC address

The MAC address for the wlan0 (or what ever suits your particular hardware e.g. eth1 or something) do

[ada@localhost ~]$ /sbin/ifconfig wlan0

wlan0 Link encap:Ethernet HWaddr 00:1C:BF:02:19:14

inet addr:10.0.0.3 Bcast:10.0.0.255 Mask:255.255.255.0

inet6 addr: fe80::21c:bfff:fe02:1914/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:1711 errors:1 dropped:249 overruns:0 frame:0

TX packets:1868 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:1252822 (1.1 MiB) TX bytes:361391 (352.9 KiB)

Interrupt:74 Base address:0x6000 Memory:df3ff000-df3fffff

Enabling VPN connection in the NetworkManager

In occasionally need to access my company network through a (Cisco) VPN connection. These are the steps required for setting up a VPN connection.

sudo yum install NetworkManager*

This should install the following package (and some dependencies)

NetworkManager.i386 1:0.7.0-9.el5 installed

NetworkManager-devel.i386 1:0.7.0-9.el5 installed

NetworkManager-glib.i386 1:0.7.0-9.el5 installed

NetworkManager-glib-devel.i386 1:0.7.0-9.el5 installed

NetworkManager-gnome.i386 1:0.7.0-9.el5 installed

NetworkManager-openvpn.i386 1:0.7.0-18.svn11.el5.3 installed

NetworkManager-pptp.i386 1:0.7.0-2.svn16.el5 installed

NetworkManager-vpnc.i386 1:0.7.0.99-1.el5.4 installed

Now your VPN connection can be set-up by clicking the small NetworkManager applet and choosing “VPN connections” ->”Configure VPN”

Installing Citrix Receiver (ICAClent)

  1. Go to http://www.citrix.com and download the rpm package choose to “Open with” /usr/bin/system-install-packages (Software installer), it should handle a few depencies (OpenMotif).
  2. run:sudo mozilla-plugin-config && mozilla-plugin-config

Setting up multimedia

This step is well described on the CentOS wiki. The steps are (tanks to Sklav)

  1. Disabel the EPEL respository in PackageManager (Applications menu -> Add/Remove Software) by choosing Edit and unchecking the EPEL repository. This is due to conflicts between RPMForge and EPEL.
  2. sudo yum install flash-plugin
  3. yum install libdvdcss libdvdread libdvdplay libdvdnav lsdvd mplayerplug-in mplayer compat-libstdc++-33 flash-plugin gstreamer-plugins-bad gstreamer-plugins-ugly vlc
  4. cd /tmp && wget www1.mplayerhq.hu/MPlayer/releases/codecs/mplayer-codecs-20061022-1.i386.rpm
  5. sudo rpm -ivh mplayer-codecs-20061022-1.i386.rpm
  6. wget www1.mplayerhq.hu/MPlayer/releases/codecs/mplayer-codecs-extra-20061022-1.i386.rpm
  7. sudo rpm -ivh mplayer-codecs-extra-20061022-1.i386.rpm

Applications I find useful

  1. Adobe Reader (sudo yum install AdobeReader_enu)t
  2. Xmgrace 2-d plotting (sudo yum install grace* )
  3. GNU Octave (sudo yum –disablerepo=rpmforge install octave octave-forge hdf5)
  4. ImageMagick (sudo yum install ImageMagick*)
  5. Inkscape (sudo yum –disablerepo=epel inkscape) #inkscape exits with a segmentation fault for some reason if installed from the epel repo. However the version (0.46) in RPMforge seems to be wotking
  6. Dia (sudo yum install dia)

Installing additional software

Installing skype is done by the following steps (apparently the suggested method on the CentOS wiki is not working any longer), taken from Hackery

cd /tmp
wget http://www.skype.com/go/getskype-linux-beta-static
cd /opt
sudo tar jxvf /tmp/skype_static-2.1.0.47.tar.bz2
sudo ln -s skype_static-2.1.0.47 skype
# Setup symlinks (the first is required for sounds to work, the second is optional)
sudo ln -s /opt/skype /usr/share/skype
sudo ln -s /opt/skype/skype /usr/bin/skype

For installing RealPlayer, Opera, Google Earth and Google Picasa just follow the guidelines on howtoforge. When installed and run from the command line googleearth complains about the following

./googleearth-bin: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.9′ not found (required by ./libgoogleearth_lib.so)

./googleearth-bin: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.9′ not found (required by ./libbase.so)

A fix is provided here.

Other remarks

The thing that pushed me towards CentOS was the fact that I had some irritating issues with Fedora 12

  • For some reason when resuming from suspend/hibernate Xorg crashed leaving me with a new gdm login screen leading to a blank desktop with all my apps gone. I haven’t found a fix, according to the mailinglists/bugzilla the issue should have been resolved (but obviously its not). Worked out of the box in CentOS.
  • Too many updates
  • Couldn’t find a way to get CPU throttling to work i.e. the “On demand” mode. Whenever trying to force this mode I was always reverted to “Performance” i.e. full speed. No problem for workstation doing heavy calculations all the time, but for a laptop it’s really a nive feature. This worked out of the box in CentOS.
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Written by aandreasen

December 16, 2009 at 10:34 pm

Posted in GNU/Linux

Tagged with , , ,

Fedora 12. Probably the best GNU/Linux distro in the world?

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I have recently installed Fedora 12 on my computer (laptop). I have used Linux for many years, and my best experience has been with Debian derived systems like Debian itself, Ubuntu and Mint, so far. However, when I started out using Linux it was on RedHat 6.2, although I jumped the RedHat wagon after 8.0. Nevertheless, I thought it was a good time now to see the current state of the RedHat upstream development.
To jump to the conclusion rigth away, I really like Fedora 12. To be more specific:

  1. Installation was very easy just as easy as Ubuntu, in my opinion
  2. Very good and professional documentation
  3. The amount of scientific packages is very good. Numpy, Scipy and Matplotlib is included. Other useful apps: Xmgrace/Grace, Octave, DX, R, hdf5, maxima, paraview
  4. The Gnome NetworkManager comes with good stuff preinstalled e.g. vpnc (Cisco VPN client) and for some reason it seems to connect to my home router faster than on Ubuntu/Mint. Although this is only a subjective impression.
  5. Eclipse comes with many useful plugins e.g. pydev, valgrind. Unfortunately the eclipse sql explorer plugin is not one of them. However, installation is easy,
  6. Compiz works very well. It has caused me some trouble to make it work on OpenSUSE 11
  7. Gnote instead of Tomboy. I have never been a fan of .Net/Mono. Again this is my personal opinion
  8. The default configuration of Gnome is good, and pleasant
  9. YUM is very easy to use. Very much like APT. The yum history command is very useful

In order to get a full installation, even with applications such as Adobe Reader, VLC, Google Earth, Google Picasa, Skype, RealPlayer, I can recommend to go through the step-by-step guide on HowtoForge. It is extremely useful. Cadeau!

However, I have found a few things I do not like so much about Fedora 12, which has pushed me towards CentOS 5.4 instead

  • For some reason when resuming from suspend/hibernate Xorg crashed leaving me with a new gdm login screen leading to a blank desktop with all my apps gone (Intel MobileGMA 965). I haven’t found a fix, according to the mailinglists/bugzilla the issue should have been resolved (but obviously its not). Works out of the box in CentOS.
  • Couldn’t find a way to get CPU throttling to work i.e. the “On demand” mode. Whenever trying to force this mode I was always reverted to “Performance” i.e. full speed. No problem for workstation doing heavy calculations all the time, but for a laptop it’s really a nive feature. This works out of the box in CentOS.

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Written by aandreasen

December 5, 2009 at 8:35 pm

Posted in Computers, GNU/Linux, Python