This may be old hat for some, but I just discovered today that it is possible to have duplicate user IDs on the same Linux machine. The ‘useradd’ and ‘adduser’ commands will not allow it: root@kratos:~# useradd -u 0 test_root useradd: UID 0 is not unique However, not to fear. Hand-editing the /etc/passwd file is [...]
I know this is old hat, as I’ve seen it on the blogosphere for a couple of weeks now, but I can’t help but post about it myself. Ubuntu Linux is selling at Best Buy for only $20.00. I have yet to grab a copy myself, but plan on doing so as soon as I [...]
Last week, my wife called me to tell me that we had been infected by a virus and that she couldn’t get online without her browser being forwarded to inappropriate sites. Further, there were new icons on the desktop, nasty messages popping up all over the workspace, and a saturated network. Sounds like more than [...]
A couple recent posts have started on the Utah Open Source Planet regarding popd and pushd not being available on a default Ubuntu install. As discovered, popd and pushd are shell built-ins for the BASH shell, and not provided by the Debian Almquist Shell (DASH). Why has Ubuntu made the change from BASH to DASH [...]
As a Linux instructor for Guru Labs, I get the opportunity to do a great deal of system administration. One of those responsibilities as an admin is performing installations of RHEL, Fedora, SLES, OpenSUSE and OEL. Soon, hopefully, we’ll be adding Debian and Ubuntu to the mix of courses and courseware. As such, along with [...]
Last night, Christer and I were playing with the Ubuntu 8.04 installer, trying to break it, and get any last bugs reported before final is released tomorrow. What I noticed last night, during the install really surprised me. ReiserFS is a screaming filesystem compared to XFS. After doing the install 3 times on 2 identical [...]
In my last post, I gave you a glimpse to runlevels, their purpose, and how they affect the overall operation of your box. Today, in this post, I am going to dig deeper into runlevels, as well as manipulating services in specific runlevels. I’m going to show you why you want to do this, as [...]
As many of you are probably already aware, I’m a Linux trainer for Guru Labs. We do all Linux training, including Red Hat, Fedora, SUSE, and others. If your company is looking for good, solid Linux training, Gurus at Guru Labs are the cream of the crop, and I’d highly recommend it. I’ve been doing [...]
Disclaimer: I don’t know enough about Upstart to hold a low-level conversation about it. What I do know of Upstart is what I have read on the Ubuntu wiki, the Upstart FAQ and a few docs scattered here and there around the web. If I have misrepresented Upstart, its goals or intentions, or SysVinit for [...]
I was spending some time today on Wikipedia, reading the entry on Ubuntu, and something hit me- something which I’ve known for a long while. I decided to sit down and blog it for those who haven’t really thought about it. Maybe this post will catch you unaware, and maybe not. Ubuntu is ONE distribution [...]
There is a very obvious bug when attempting to set SGID on a directory when you are not a member of the group that has ownership on that directory. For example, follow along with me in the following example on your box: [Wed 08/01/30 06:55 MST][pts/1][x86_64/linux-gnu/2.6.22-14-generic][4.3.4] <aaron@kratos:~> zsh 162 % mkdir ~/tmp [Wed 08/01/30 06:56 [...]
When creating logical volumes, you may want to backup your data before you run ‘pvcreate’. Take it from me, who is sitting at his computer at 1 in the morning pulling his hair out, as he lost a *lot* of data, and is currently reinstalling Ubuntu 7.10. Yeah, I know all about version control and [...]
Warning: This post could be very long in many RSS readers and planets. Thus, going against how I feel about chopped RSS, I think it would be wise to do so here. At the bottom of the post, there is a “Continue Reading” link. If you’re curious, please click through. Per John Anderson’s post about [...]
This is just a quick post to say that I am really impressed with Ubuntu 7.10. I’ve been running Debian Sid on my laptop for the past 4 months. Although I’m running 7.10 on my old bed-ridden laptop and on my dual-boot desktop, I haven’t really spent the time to play with it. Well today, [...]
