For a long time various people have been telling me there’s not much information on the low-level / plumbing details of the virt stack on Linux. Especially information related to qemu and its various settings, devices, and so on.
Documentation surely is difficult to come by, but a quick and straightforward solution is to syndicate all of the blog posts that people doing virt development write into a common stream: a planet virt. I started hosting and testing such an instance on openshift, but was quickly pointed to the existing Virt Tools Planet by Rich Jones and Dan Berrange. Dan added the list of people whose blogs I followed for virt development to that instance.
I updated the KVM and QEMU wikis to ensure the Planet gets more visibility, and hope this goes a small way to quell the complaints of not enough available information.
I participated in the Fedora Activity Day at the RH office in Pune yesterday. There was a decent turnout, 20+ people, and it was fun to test the in-progress version of the upcoming F21 release along with other folks.
Continue reading Fedora Activity Day Pune Report
I run Piwik on OpenShift to collect stats on visits to this blog. I’m not really interested in knowing who visits my site. I’m only interested in knowing what people are visiting for, and how: which pages are more viewed? where are people landing to my site from? how long after publishing some post do people still visit it? And so on.
One of the ways this is also helpful is to track 404 (page not found) errors that pop up for visitors. After migrating my previous posts from blogger, I kept monitoring for any posts that may have been missed by the automatic migration process, and manually moved them. Continue reading Use of Piwik Analytics
Experimenting with the new cyanogenmod builds for Android 4.3 (cm-10.2) resulted in a disaster: my phone was setup for encryption, and the updater messed up the usb storage such that the phone wouldn’t recognise the in-built sdcard on the Nexus S anymore. I tried several things: factory reset, formatting via the clockworkmod recovery, etc., to no avail. The recovery wouldn’t recognize the /sdcard partition, too. Continue reading Backing Up Data on Android Phones
A few weeks back, a strange bird call started waking me up. Though red-whiskered bulbuls are supposed to be pretty common, I’d not heard them or seen one up close.
Continue reading Red-Whiskered Bulbul
Several applications need random numbers for correct and secure operation. When ssh-server gets installed on a system, public and private key paris are generated. Random numbers are needed for this operation. Same with creating a GPG key pair. Initial TCP sequence numbers are randomized. Process PIDs are randomized. Without such randomization, we’d get a predictable set of TCP sequence numbers or PIDs, making it easy for attackers to break into servers or desktops.
On a system without any special hardware, Linux seeds its entropy pool from sources like keyboard and mouse input, disk IO, network IO, and any other sources whose kernel modules indicate they are capable of adding to the kernel’s entropy pool (i.e .the interrupts they receive are from sufficiently non-deterministic sources). For servers, keyboard and mouse inputs are rare (most don’t even have a keyboard / mouse connected). This makes getting true random numbers difficult: applications requesting random numbers from /dev/random have to wait for indefinite periods to get the randomness they desire (like creating ssh keys, typically during firstboot.).
Continue reading About Random Numbers and Virtual Machines
I’ve been using the Fedora 18 pre-release for a couple of months now, and am generally happy with how it works. I filed quite a few bugs, some got resolved, some not. Here’s a list of things that don’t work as they used to in the past, with workarounds so they may help others:
Continue reading Workarounds for common F18 bugs
Most of the spam I receive gets caught by spam filters, and pushed into the separate spam folder. I check the folder once in a while for false positives.
A recent message in my spam folder, with the subject ‘Mystery shopper needed’ caught my attention:
Continue reading Mystery Shopper Needed
If you have enabled git information in the shell prompt (like branch name, working tree status, etc.) , an upgrade to F18 breaks this functionality. What’s worse, __git_ps1 (a shell function) isn’t found, and a yum plugin goes looking for a matching package name to install, making running any command on the shell *very* slow.
Continue reading __git_ps1 not found after upgrade to Fedora 18