Hardcore Linux

How to re-enable Ubuntu 13.04 systray to display Pidgin and other programs.

hardc0l2e — Sat, 18 May 2013 02:53:03 +0000

Previously, Ubuntu tweak, myUnity and other Unity tweaking tools can provide configuration to modify current whitelist for Unity’s system tray or systray. But with recent upgrade (as usual), it was suddenly gone and nowhere to be found.

But at last, there’s a workaround (again..pfff) for this, here’s how:

1. Add this PPA and update+upgrade your Ubuntu 13.04 system.

sudo add-apt-repository ppa:timekiller/unity-systrayfix
sudo apt-get update
sudo apt-get upgrade

2. Afterwards, restart Unity, press ALT+F2 (run application), then type in unity, press ENTER key.

3. You must have dconf-editor to modify configuration, if not yet installed, do this:

sudo apt-get install dconf-tools

4. Open dconf-editor and navigate to com > canonical > unity > panel and the “systray-whitelist” should be displayed there so you can enable some apps to be able to use the systray. From the default setting, change it to ‘all’ (yes with the single quote “‘“character)

5. Then configure Pidgin, from Tools > Preferences. Set the Show System Tray Icon to “always“

6. Done.

Allow Standard User to connect to wifi on Ubuntu

hardc0l2e — Thu, 14 Mar 2013 03:23:10 +0000

Still using Ubuntu 12.04, and one of the problem we’ve encountered is it requires normal user to authenticated the designated admin user’s password when connecting to wireless network, which in my opinion doesn’t make sense. How can a normal user access internet over wifi if they aren’t allowed to do so?

Check what google search has to offer, I finally found a fix for this. Adding policykit rules for wifi users.

Create or modify a file etc/polkit-1/localauthority/50-local.d/52-wifi-management.pkla


$> sudo gedit etc/polkit-1/localauthority/50-local.d/52-wifi-management.pkla

and then enter the following


[Wifi management]
Identity=unix-group:netdev
Action=org.freedesktop.NetworkManager.*
ResultAny=no
ResultInactive=no
ResultActive=yes

and save on exit.

Add the user to the netdev group


$> sudo usermod -a -G ftp jerry

Restart the system and standard user should now be able to connect to wifi..

Done.

Convert VCD to MPEG

hardc0l2e — Tue, 27 Nov 2012 02:24:03 +0000

I stumble upon this link which is quite useful in converting/ripping VCD to MPEG (or you can also have it as XVID)

http://www.binarytides.com/ubuntu-convert-vcd-dat-file-to-mpeg/

How to block facebook on your linux based firewall

hardc0l2e — Tue, 13 Nov 2012 12:00:31 +0000

For most corporate network, social network are not allowed, and since facebook is one of the most popular social network site, it continuously add new IP address frequently. So blocking IP known to you alone is not enough. Here’s a better way to block IP owned by facebook (Only if you wish to block it in your network)

#> /usr/bin/whois -h whois.radb.net '!gAS32934' | head -n -1 | tail -n -1 | /usr/bin/xargs --max-args=1 | /usr/bin/xargs -I {} --max-args=1 /sbin/iptables -t mangle -I POSTROUTING -d {} -j DROP

tail -f with highlighting

hardc0l2e — Wed, 03 Oct 2012 02:57:27 +0000

A little help with perl

http://sysadminnotebook.blogspot.com/2012/09/tail-f-with-highlighting.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+SysadminNotebook+%28Sysadmin+Notebook%29

Getting WAN IP on console or shell script.

hardc0l2e — Thu, 13 Sep 2012 05:50:21 +0000

There are few other guide in getting your current WAN IP on Linux console or fetching it within a shell script. But this one works for me.

1. To get the current WAN IP:

$> echo "$(wget http://automation.whatismyip.com/n09230945.asp -O - -o /dev/null)"

2. For LAN IP address/es:

$> ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'

KVM guest not automatically starting at boot sequence

hardc0l2e — Wed, 12 Sep 2012 03:47:25 +0000

I don’t know but I encountered this problem using Ubuntu 12.04 as KVM host, even though I already added the guest VM in the /etc/libvirt/qemu/autostart as symlink but during the host boot sequence it is still not automatically started (the guest machine).

Here’s a quickfix that works for me:

1. Modify the /etc/init/libvirt-bin.conf and look for the line with:

start on runlevel [2345]

2. Replace that with:

start on (runlevel [2345] and net-device-up IFACE=br0)

3. Done.

Please note that use your current bridge network device, in my example it is br0.

Hide network-manager applet in Ubuntu 12.04 when using ifup.

hardc0l2e — Wed, 16 May 2012 03:23:01 +0000

Wish to hide the nm-applet when decide to use conventional ifup instead of network-manager? Here’s how:

1. Install Gconf-Editor:

$> sudo apt-get install gconf-editor

2. Run gconf-editor and go to: Apps –> nm-applet

3. Uncheck the setting called show-applet

4. Done.

Ubuntu 12.04 /etc/resolv.conf 127.0.0.1 implementation with dnsmasq

hardc0l2e — Wed, 09 May 2012 12:22:30 +0000

On the current version of Ubuntu (12.04), you might notice that the current /etc/resolv.conf file always record a nameserver 127.0.0.1 which then resolv dns via dnsmasq, but most of the time after test few things, I found it more problematic. It always disregard my local DNS server, and goes directly to the DNS of my ISP.

If you’re having the same problem like mine, here’s a quickfix:

1. Modify the configuration /etc/NetworkManager/NetworkManager.conf

$> sudo gedit /etc/NetworkManager/NetworkManager.conf

2. Comment the line that contain “dns=dnsmasq“

[main]
...
#dns-masq

3. Then restart the network-manager

$> sudo  service network-manager restart

4. Done

Installing KVM with OpenVSwitch on Ubuntu 12.04

hardc0l2e — Thu, 03 May 2012 06:36:36 +0000

Here’s a good article from http://blog.allanglesit.com/, I myself tried it my in test server and it’s working great, though I’m still new with OpenVSwitch.

The article has been released for Ubuntu 12.04 system. I also found out that the KVM version currently available in Ubuntu 12.04 has better performance compare to 10.04, which I think is a good sign when planning to deploy KVM host for your VMs.

The actual URL: http://blog.allanglesit.com/2012/03/linux-kvm-ubuntu-12-04-with-openvswitch/

Done.