Not too long ago, upgrading firmware on STM32F4-Discovery board required it to be performed on a Windows machine. That annoyed the heck a lot of people, myself included. There’s a very good news for Linux and Mac users. Now, you can do it from your favorite OSes. Since I’m so excited about this, here’s a short article on how to do just that. First download “STSW-LINK007” from <www.st.com/web/en/catalog/tools/PF260217>. At the time of this writing the file is called: stsw-link007.zip. ...

Normally to drop a database in PostgreSQL, we can just type: DROP DATABASE database; Here’s a list of my current databases: postgres=# \l List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges -------------+-----------+----------+-------------+-------------+----------------------- dashboard | dashboard | UTF8 | en_US.UTF-8 | en_US.UTF-8 | postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | postgres-db | postgres | UTF8 | en_US.UTF8 | en_US.UTF8 | puppetdb | puppetdb | UTF8 | en_US.UTF8 | en_US.UTF8 | template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres + | | | | | postgres=CTc/postgres template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres + | | | | | postgres=CTc/postgres (6 rows) I want to drop a database named postgres-db. So, let’s try to drop it: ...

As of today, the default storage for Docker on (K)Ubuntu 15.10 is AUFS. I want to switch it to OverlayFS. Personally, I’m still new to Docker, but I did hear that OverlayFS is better than AUFS. You can read more about OverlayFS here. Anyway, the purpose of this post is how to switch OverlayFS and avoid head-scratching. On Ubuntu 15.10 (wily), one can start/stop services either using Upstart or systemd. Since I want to get more accustomed to using systemd, I’ve been trying to use it anywhere possible. For example, here’s the command to start docker: ...

Well, first of all I think the title of this post won’t entirely reflect its content. However, I need to go ahead and post this now. At work, We’ve been having issues with cups service not running on some Kubuntu 14.04 desktops. This should not happen since even if cups service is dead, we have Puppet agent running on each machine to check and make sure that ‘cups’ is running else will be automatically restarted. ...

I’m running ZFS on Fedora 23 and I notice that there’re new features which can be enabled in the existing pool. # zpool status pool: tank state: ONLINE status: Some supported features are not enabled on the pool. The pool can still be used, but some features are unavailable. action: Enable all features using 'zpool upgrade'. Once this is done, the pool may no longer be accessible by software that does not support the features. See zpool-features(5) for details. scan: none requested config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 sdb ONLINE 0 0 0 sdc ONLINE 0 0 0 errors: No known data errors Get the ZFS version for tank’s pool: ...