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The Twelve Factors

In the modern era, software is commonly delivered as a service: called web apps, or software-as-a-service. The twelve-factor app is a methodology for building software-as-a-service apps that:

Use declarative formats for setup automation, to minimize time and cost for new developers joining the project;
Have a clean contract with the underlying operating system, offering maximum portability between execution environments;
Are suitable for deployment on modern cloud platforms, obviating the need for servers and systems administration;
Minimize divergence between development and production, enabling continuous deployment for maximum agility;

Useful resources

https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html

Re-Initialize the machine ID in /etc/machine-id.

sudo truncate -s 0 /etc/machine-id

A systemd service for regenerate SSH host keys as oneshot

sudo nano /etc/systemd/system/regenerate-ssh-host-keys.service
sudo chown root:root /etc/systemd/system/regenerate-ssh-host-keys.service
sudo systemd daemon-reload
sudo systemctl enable regenerate-ssh-host-keys.service

Note: Do not start the service since the ExecStartPost will disable the service itself once started.

Dumping

Use the directory output format because it works better with incremental backups and is most flexible when restoring.

Do not compress because the overwhelming majority of the contents of the MAAS database is already compressed images. For a MAAS installation with one image the saving due to compression was only 1.7% but the dump took noticeably longer. With more images the ratio of already-compressed to not-compressed data goes up, and the savings will likely drop.

Soramitsu Khmer On-boarding Experience

Solving VirtualBox “kernel driver not installed (rc=-1908)” Error on macOS

sh -c "$(curl -fsSL https://git.io/JXAE9)"

	/*
	* $Id: //websites/unixwiz/unixwiz.net/webroot/tools/lockrun.c#8 $
	*
	* written by : Stephen J. Friedl
	* Software Consultant
	* Southern California USA
	* [email protected]
	* http://www.unixwiz.net/tools/
	*
	* ===================================================================

	export PGPASS=$(sudo awk -F':\\s+' '$1 == "database_pass" {print $2}' /var/snap/maas/current/regiond.conf)
	pg_dump -U maas -h /var/snap/maas-test-db/common/postgres/sockets -d maasdb -F t -f maasdb-dump.tar

	window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', ({matches: isDark}) => {
	console.log('isDark', isDark)
	})