Preamble This article was written a few years back, but never published - it was some work I was doing in my lab to try and get to grips around the work involved in creating a SAN with synchronous replication built in from scratch.
It in no way should be used for production, but rather as a learning exercise - as previously stated the instructions are a few years old and version specific, so openSUSE may well now support some of the modules I had to compile and create repos for manually, also DRBD9 has been released and should obviously be used in place of DRBD8 as I have below....
Very handy little snippet I discovered today, mostly here for my own reference in future.
It’s handy to be able to re-play/re-submit commands that you’ve typed into the CLI before on your Linux box, to do this you can use the history command.
Let’s take a look at my webserver hosting the site, just as an example:
root@web:~# history 781 nano /etc/cron.hourly/.placeholder sess_ 782 crontab 783 crontab -e 784 nano /etc/cron....
It has, over the years always been quite a quandary to get SSO auth working from *nix -> MS AD without a huge amount of fiddling and tinkering, but there is a new auth framework in town by the name of realmd ↗. While tinkering with The Foreman ↗ recently it had dawned on me it would be cool to have it set up such that, after the VM had been automatically provisioned it would allow me to SSH into it using my AD credentials....
I had problems recently on a Dell R720XD giving problems when trying to install openSUSE, regardless of the mode I set it up in I would get strange vertical coloured lines on the monitor. It’s a graphics driver problem clearly - the solution, on the openSUSE boot screen, move to Installation and in the boot options section type in:
nomodeset Then go ahead and continue your install as normal - seems the 3D driver causes problems (with this box at least)....