Following up on my previous post with the same topic, for Hyper-V, this is how to get DNS names for your VirtualBox guest VM’s into your hosts file on a Windows host. First things first, you need the VirtualBox Guest Additions installed for the host to tell OS level information about the guest, just as […]
So, running a couple of Hyper-V machines, and needing to determine their local IP addresses to connect to them. As long as the Hyper-V Integration Services are installed (apt-get install hyperv-daemons on Debian-based distributions), PowerShell on the host machine will have access to the IP addresses of the client machine. Without the Integration Services, PowerShell […]
I’ve found these useful during development: Listing running queries: SELECT pid, now() – pg_stat_activity.query_start AS duration, query FROM pg_stat_activity WHERE state = ‘active’ AND pid <> pg_backend_pid(); Listing queries that have run for more than a full minute: SELECT pid, now() – pg_stat_activity.query_start AS duration, query FROM pg_stat_activity WHERE state = ‘active’ AND pid <> […]
After installing the latest stable version of docker-ce (5:18.09.0~3-0~raspbian-stretch as of the time of writing), Docker would take ages to start after a reboot. Commands would even time out waiting for it. /var/log/daemon.log shows a gap of almost 4 minutes between the attempt to start the Docker Application Container Engine and the first log line […]
Tasked with recovering files you don’t have access to through the web interface, you can always find these through the file system if you’re the operator. You could, of course, give yourself access, but let’s save that for another time. Right now we want the files our users removed and/or can’t find. We start by […]
I’ve previously presented a manual process for doing this, but lately I’ve had to do it more often, and I figured it was about time for automation. This script will: Run e2fsck on the root file system Erase logfiles, such as bash_history and stuff in /var/log Erase the test.h264 video file Wipe resolv.conf Defragment the […]
In this example, we’ll be using a wildcard certificate from Let’s Encrypt, obtained through their recently released wildcard certificate offering. What we’re doing The use case is that we want, for one reason or another, to use this certificate in an environment that does not have unrestricted internet access, such as a health institution or […]
Cheap Windows 10 capable devices often come with very limited internal storage space. To make use of this, it is of course crucial that Windows itself takes up as little space as possible. To combat the bloat, there’s a little known feature in compact.exe, the built-in disk compression tool, that compresses the operating system itself, […]
No subprocess, no sleep command, no coproc, no nothing? Yes. Sleeping in bash script is traditionally done with the sleep (1) command, which is external to bash, the command /bin/sleep. However, if you have a bunch of scripts running that all sleep this way, the output of ps looks like a mess, pstree looks like […]
UPDATE: See the automated script at https://blog.dhampir.no/content/script-for-creating-a-compressed-image-file-from-a-raspbian-sd-card Raspbian, by default, expands to fill the SD card it finds itself on, the first time it boots. After having customized an image to your liking it would be favourable to avoid copying 16 gigabytes of data, or however large your chosen SD card is, each time you […]