NodeMCU: upgrading firmware and experimenting LUA

As you might already know, I’ve just placed three Arduino MEGAs around my new house and I’m using them to –among other things– turn on/off the lights of the whole house. I still have to “enter” the new house so… I’m currently “configuring” the “light-switching” system (associating LIGHTs with related Push-Buttons). After several”upgrades” of the … [Read more…]

Reinstalling GRUB2 over an existing (and un-bootable) CentOS 7 box

Every now and then, you might need to “recover” from your un-bootable CentOS. I’m not referring to serious and/or hardware problems, like broken HDD or corrupted filesystem. I’m referring to changes in “geometry” of your HDD/partitions, changes in partitions UUIDs, switch from MBR to GPT, etc. etc.. In other words, I’m referring to system changes … [Read more…]

DNS (bind) issues and… (missing) security policies

Yesterday morning I’ve been notified, by the monitoring platform running at a customer site (NAGIOS, actually), that two distinct DNS services (two BIND instances running on two different Linux hosts – different distributions and different bind versions) gone down at mostly the same time:

Even tough the srv-***** was a slightly old server, with … [Read more…]

…and so, let’s go on-line :-)

So, finally, I’ve taken some time, this sunday, to bring on-line this blog.  It’s quite some time that I’m trying both a proper way to keep together my tech-notes and, at the same time, to refresh my website. After some (…actually, not-very-deep) search, I ended relying on WordPress. All the alternatives I’ve investigated: TiddlyWiki : really … [Read more…]