Routine Power-Cut Since Yesterday

One development which this earlier posting foretold, was that my power-utility needed to do work on their power-lines, and they had informed me via an automated message, that my power would be cut between 12h30 and 15h30 today.

One of the details which I would not trust 100%, is the exact timing of such a power-cut. Furthermore, yesterday, before I went to bed, I felt like this morning, I might sleep in. Which I did.

This implied, according to my thinking last night, that I could get woken at 10h00 this morning, by a power-cut, which was intended to take place only as of 12h30. And so around 22h00 last night, I shut down my computers, and battened down the hatches otherwise, so that my home would be ready for a power-cut by then.

As far as I can tell, the power-cut did take place within the intended time-interval. So maybe, I could have left the computer running overnight after all, and just shut everything down this morning after getting out of bed. But I was not sure of this fortunate turn of events, last night.

And as it goes, I also saw no point ins staying home, if for some part of my afternoon I’d have no computers to play with. I left this morning to follow activities outside, and came back home after my power had already been restored.

So my site and blog were offline as of 22h00 last night, until about 16h50 this afternoon.

Greetings again,

Dirk

 

Routine Kernel Update Today, Downtime

I host this site on a Debian / Jessie (Linux) computer, which I name ‘Phoenix’. Through the package manager, it receives routine kernel updates, and today was a day on which it received one.

Even on a Linux computer, a kernel update generally requires a reboot, which I carried out.

But, because This computer is also my Web-server, and the host to my blog, that means that for a few minutes my site and blog were offline – i.e., unavailable to readers. This was happening from approximately 19h45 until 19h55.

I apologize for any inconvenience.

For what it’s worth, I consider this to have been one of the least-troublesome reboots, that I’ve had to carry out over the years.

Dirk

 

libc Updates today, Downtime

This computer is a Debian / Jessie (Linux) system. Just today, it mainly received an update to its ‘libc‘ libraries, that comprised 16 packages. These libraries are essential to the core of how every program works. Therefore, even though it is a Linux system, it needed a reboot.

The update seems to have gone smoothly, but because this computer is also my Web-server, my site and blog would have been offline from about 20h30 until 20h45.

It is also not feasible for me to display a Maintenance Mode page during such a time, because a Web-server would need to be running, in order actually to display a Maintenance Mode page.

I apologize for any inconvenience this 15-minute interval may have caused to my readers, but it was essential.

Also, because this was a full reboot of my host-machine, my ‘memcached‘ (server-side) caching daemon was restarted, for which reason the most-favorite postings retrieved by my readers will be a bit slow to fetch for some time.

Sorry again,

Dirk

 

Power Fluctuations, Downtime

I take the unusual step of hosting my Web-site, and this blog, on my personal computer at home. If the reader has questions about how this is possible, I gave a brief explanation here.

One of the unfortunate facts which this implies, is that my site availability is only as good as the reliability of my personal computer. People who have their sites hosted more conventionally on professional services, are also paying to have professionals avoid downtime.

Today we are having extreme weather on the Island Of Montreal. The maximum daytime temperature is expected at 32⁰C, and we are having continuous, powerful wind-gusts.

What this has done is cause brief, momentary power-fluctuations to take place, that are long enough to cause this hosting computer (‘Phoenix’) to go down, but which are short enough, that the supply-capacitor charge on most of my other systems – including several other computers – allows those to keep running, as though no fluctuation had ever taken place.

In fact, this has taken place in such a way, that my IP address never actually changed. But, my Web-server ‘Phoenix’ did go down, not once but twice so far, taking my Web-site down with it.

This started happening around 12h00 today, but is expected to continue throughout the afternoon. The extreme weather is in fact expected to break, when severe Thunderstorms put an end to the high temperatures.

Also, because this type of a reboot causes my server-side caching-daemon ‘memcached‘ to restart, it means that the speed with which the most-frequently-requested pages are served, will be slow for some time to come.

I apologize to the reader for this, but it is just an automatic hazard that follows, when we host our Web-site on our home computers.

Dirk

(Edit: )

This type of a ‘power fluctuation’ can be described more precisely. One seemed to take place which I did not witness, while one took place which I did.

I’d call that one a ‘voltage drop-out, that lasted somewhere between 1/10 and 1/5 second’. There seemed to be no period of partial voltage; the lights just went dark for that fraction of a second.