Technology Insights

Ubuntu Equivalent Of yum whatprovides On CentOS

In the past I used CentOS Linux the open source RedHat Enterprise Linux clone but these days I find myself using Ubuntu Linux more and more often because so many more packages that clients want installed are more up to date. One command I used to use on CentOS all the time was the yum whatprovides command which would allow me to search for specific applications, scripts, libraries, etc. to figure out what packages I needed to install. The command that is similar on Ubuntu is apt-file which does not come installed by default. Below I show the output of an example yum whatprovides command on CentOS Linux followed by what needs to be done to use apt-file on Ubuntu Linux.

Technology Insights

Change Default Text Editor In BackTrack Linux To vi

Changing the default text editor to vi on Ubuntu is fairly easy however it may be tricky depending on how it has been set since there are numerous ways. In BackTrack Linux for instance the default editor is set using select-editor so if you follow another Ubuntu Linux howto it may tell you to modify the default editor using update-alternatives. Below I describe setting the default text editor using both of the mentioned methods and note a couple other locations where it can be set.

Technology Insights

Test NFS From OSX

When setting up a NFS server its nice to be able to test from your desktop to verify things are working properly. In the current scenario I setup NFS on a BackTrack Linux server and needed to test it quickly from OSX to make sure NFS mounts were advertising properly. Below are a couple quick commands to first display the available NFS mounts and second to mount the NFS drive on OSX to verify functionality.

Technology Insights

Setup dhcp3 Server To Listen On eth1

Earlier I was setting up a PXE boot server that was connected to two networks and wanted to hand out DHCP addresses only on the second interface which in this case was eth1. The primary interface on the server is eth0 however that Ethernet port is attached to a switch that already has a DHCP server connected to it so I needed to make sure that the DHCP server only replies to requests on eth1. Use the dhcpd.conf configuration option below to specify the Ethernet interface that dhcpd will listen for and reply to DHCP and/or BOOTP requests.

Technology Errors

invoke-rc.d: initscript nfs-kernel-server, action “start” failed

Earlier this morning I needed to run some tests against a NFS server running on BackTrack Linux version 5 release 3 and ran into some issues installing the nfs-kernel-server. It appeared as if things started to install properly but then the nfs-kernel-server did not start properly and ended up displaying a couple errors. Below I describe the error in more detail followed by the process I used to get the nfs-kernel-server installed properly on BT5.