Random Thoughts

Tech, words and musings from an Englishman in Seattle

Your Attention Please

The way that “official” signs are worded, especially at airports, has always bugged me. Take this one from the gate at San Jose airport for example:

  1. All checked and carry-on bags are subject to search. - Ok, sounds good.
  2. All passengers are warned to control their carry-on baggage etc… - Errr, first up, am I being asked to do something, or am I being told that all passengers have been warned about something. And why “warned”.
  3. All passengers are advised not to accept items from unknown persons. - Are they? Cool! Oh, were you asking me to do something?

Maybe I'm being pedantic, but why not:

  1. All your checked and carry-on bags are subject to search.
  2. Please keep an eye on all your carry-on baggage etc…
  3. Please don't accept items from unknown persons.

Seems better to me.

This T-Shirt Is Older Than You

I picked up this shirt back in college from a Skin Games gig. Kev may well remember that evening…

What astounds me is two-fold:

  1. That the shirt has lastest this long.
  2. That the shirt is older than a bunch of people that work here.

Anyhow. Great band. Great memories.

A New Video Camera

I think this is it - the Canon Vixia HF10.

I've been looking for an HD camcorder to replace my trusty, and seven year old, Canon Elura 2 and this looks like the right one.

Any thoughts?

Server Meltdown - So What Did I Learn?

If you've been following along, you'll know that I've just completed a rebuild of my home linux server which had a fatal hardware failure. You can find the posts here:

  1. Server Meltdown - A Tale Of An Upgrade
  2. Server Meltdown Part Two
  3. Server Meltdown Part Three - Where A Monitor Is Not Your Friend
  4. Server Meltdown Part Four - Where The NIC Hates You
  5. Server Meltdown Part Five - Where Spare Hardware Is Your Friend
  6. Server Meltdown Part Six - It's Alive!
  7. Server Meltdown Part Seven - Where We Finish Up And Get Samba Installed

And what did I learn?

  1. Having good backups are a life saver.
  2. Never trust integrated components, neither graphics controllers nor network cards. I actually knew this, but had forgotten…
  3. Debian is easy to set up when you've done it a couple of times already :-)
  4. Sometimes, just starting from scratch and dealing with the pain is faster than trying to recover and reinstall configurations from backups.

Your mileage may vary.

I've Moved To Media Temple

In the spirit of spending as much free time as possible, I've moved this blog and my other sites to Media Temple.

Hopefully you didn't notice a thing change except for a decrease in latency - the ping times have dropped from 80 milliseconds to 40 (at least from my house). The servers also appear to be a lot more speedy.

The other advantage (I hope) is an increase in availability. My old server was forever getting crushed by comment spammers - Media Temple's grid stuff should be able to take the punishment.

Let me know if you see any issues.

Server Meltdown Part Seven - Where We Finish Up And Get Samba Installed

So it was finally time to get Samba running on my home system.

The plan was to just copy over all the entire installation from backups and just run it. But, of course, things never go to plan.

First up, this is an x64 installation and of course the ppc binaries won't run. No problems thought I. I'll just apt-get install samba and all will be well.

No joy. The supported installation of samba in the latest version of debian is actually older than the version I was running on my old machine.

Ok, so we're building from source again.

Build, build, run.

Nope. I could variously get my desktop joined to the domain, then the NAS. When I finally got them both joined, I ran into the dreaded NTSTATUSNOLOGONSERVERS problem. Again.

So, thought I. Lets just create a fresh domain. This was actually the best solution. My only worry was losing access to data on the NAS due to permissions problems. Handily, the latest firmware upgrade to the Infrant NAS can give you (via an add-on) root shell access to the NAS, so I figured I could fix it up later.

I then brought up a fresh domain, joined all the machines and all was well. Pretty easy really. I fixed up all the permissions problems on the NAS by just ssh'ing in and running chown -R steve.“domain users” share/* on all the shares in /c. The only minor other thing I had to do on the NAS was move my home domain share from /c/home/OLD_DOMAIN/steve to /c/home/NEW_DOMAIN/steve and then chown -R steve.nogroup /c/home/NEW_DOMAIN/steve.

And then all was well in Casa Del Lacey…

Server Meltdown Part Six - It's Alive!

Now that the shiny new linux system is up and running, it was actually relatively easy to bring it online as my home server, replacing all the functionality of my now dead system.

This post will deal with everything except the installation of Samba (which provides Windows Domain Controller services) - those details will be in an upcoming post.

First up, some basic stuff. I need to be able to log into the box from another system as it's going to run headless and I want the monitor that it's currently using back on my Vista box.

Basic Setup

While logged in as root on the console, add my user account (created during setup) to /etc/sudoers using visudo.

Next, edit /etc/apt/sources.list, removing the cdrom entries as all further package installs will be using the net and I don't want apt-get complaining that it can't access the cdrom drive.

Make sure the system is up to date:

apt-get update
apt-get dist-upgrade
apt-get upgrade

Now, I want to be able to perform the rest of the setup remotely, so install ssh and friends in order to ssh into the system.

apt-get install ssh

Joy, now I can login and perform the rest of the installation remotely rather than at the console.

Network services

The clock needs to be set right, so:

apt-get install ntpdate
ntpdate time.windows.com

Yes, I used Microsoft's time server - it's the only one I can remember off the top of my head!

Next, I need to get the network time service (NTP) running on the machine. It will be providing time services to all other machines on the network and periodically setting it's own time against the root time servers.

apt-get install ntp ntp-doc

You'll need to edit /etc/ntpd.conf and then /etc/init.d/ntpd restart to get it to notice the changes. Note that pretty much everything I talk about here has either a config file in /etc or it's own directory of config files, also in /etc. They're pretty self-explanatory - just take a look at the config files themselves and the related documentation. Everything also has a script located in /etc/init.d to control it's operation.

For this reinstall, I just diff'd my backed up config files against the newly installed files to make sure there wasn't anything new that I needed to be aware of and then just copied my old files over and restarted the service.

Next up, bind - the DNS server. I have a local DNS domain in my house that all the clients have an entry in, the linux box serves up that domain and caches domain requests so that the only nameserver the client machines need to know about is this linux box.

apt-get install bind9 bind9-doc

Bind is probably the hardest thing to configure. Handily I had all my backups (yay, me!). I'll probably write up a post dedicated to that at some point, though one thing did bite me a little: if you're restoring your configuration files from backup and get an auth error when trying to restart or reload the server, just killall named and start it up fresh as the authorization key in /etc/bind/rndc.key probably changed when you copied across the old data.

At this point, edit /etc/resolv.conf and point the nameserver line at the localhost, 127.0.0.1 so that client binaries on the system itself use your shiny new nameserver.

Next up DHCP. This is a little service that client machines use to get an IP address. In a home environment this is normally handled by your wireless or broadband router, but I prefer to have the server do it as other useful information, such as name and time server information is also passed to the client. Configuration is fairly simple - check out the documentation.

apt-get install dhcp3-server

Sweet! The base services are now all configured. At this point it's probably a good idea to reboot the server to make sure all these services come up nice and cleanly.

A Few Other Things That I Do

I like to be able to mount drives from other machines on the linux box. For example, my Infrant NAS exports a “backup” share that the server backs itself up to. I use autofs for this.

apt-get install autofs

Edit /etc/auto.master and un-comment the line for auto.net. The backup share is now available at /net/blob/c/backup. FYI, 'Blob' is the name of my Infrant NAS box…

After that it was just a matter of reinstalling my crontabs from backup and then this blog and a few other things are automatically backed up to the NAS. Cool. Safety is back…

Another thing to mention is that I use Amazon S3 to backup my photos and videos. The scripts that do that are written in ruby, so that also needs to be installed.

apt-get install ruby rubygems

I need rubygems installed as it brings with it the openssl ruby package.

The last thing (modulo Samba), that I need is dynamic DNS updating. I use dyndns.org so that I can have a friendly DNS same to connect to the server when I'm not at home. The linux box handles updating the DynDns database with whatever IP address Verizon happens to be giving me at the time of update. I use inadyn to accomplish this.

apt-get install inadyn

Unfortunately, inadyn doesn't come with any form of script to get it started, or any useful documentation whatsoever. So I just copied an existing script in /etc/init.d and got it going with a few minor modifications. Let me know if you're interested in a copy.

All in all, the entire process took me about an hour to get everything setup once the base linux system was successfully installed.

Next up - Samba!

Server Meltdown Part Five - Where Spare Hardware Is Your Friend

At the end of yesterday's post I was planning to take a trip to Fry's this morning to purchase a new ethernet card for my new machine. This morning's realization is that the new machine actually has two spare standard PCI slots and I have a load of PCI ethernet cards sitting in boxes and dead machines. One of those spare cards happens to be old trustworthy Intel Pro 1000.

I disabled the motherboard integrated ethernet adapter, installed ye olde Intel card and rebooted.

Everything works.

Joy!

Now that I have a working network during install, package configuration during Debian setup is working. I just installed the base desktop package as I'll manually install and configure everything else later and write up the process for my records and your reading pleasure.

Later, dear reader…

Server Meltdown Part Four - Where The NIC Hates You

It appears from reading various threads over the net that the Linux sky2 driver in conjunction with the Marvell 88E8056 Gigabit ethernet controller results in a steamy pile of poo.

I can confirm that this is indeed the case.

Again following up from my previous posts, the next step in home linux server resurrection was to attempt to install Ubuntu 7.10 x64 edition on my shiny new machine. This didn't get very far. A boot from CD ended up in a wedged machine no matter how I tried to run the install.

Hmmm, I think I'll go back to the trusty Debian distribution. I downloaded the latest stable (Etchy) net install disk. Boot. Joy! It all runs. Except the net card. Lots of kernel errors regarding the ethernet driver followed by a fatal crash.

Suck.

Maybe I'll try Lenny, the “in test” release.

Same thing.

Tomorrow I think I'll be buying a vanilla net card for this puppy. Something made by Intel. For now I think I'll just install Etchy on the machine with the ethernet disabled and let the machine burn in.

Sigh - three days into this and it seems like the box isn't going to be up and running before my next trip. I thought this was supposed to be easy?

More as it happens…

Server Meltdown Part Three - Where A Monitor Is Not Your Friend

Continuing the saga of yesterday, I took the new machine back to Hard Drives Northwest early this afternoon where they very helpfully plugged the machine and watched it boot fine. They were very helpful and suggested that it might be a power problem - I had been powering the machine through a UPS.

So I went back home, plugged the machine directly into the wall and watched it fail to POST again.

Just a flashing cursor.

Then I had a little brainwave. It's plugged into a 24 monitor. Could that be it? Surely not - it's connected via VGA.

Unconnect video cable. Power on. Wait 10 seconds. Plug in video cable. Success!

Being an ex-Graphics guys I've a ton of old video cards lying around, so I plugged in a spare ATI PCI Express card, plugged the monitor into that and I'm off to the races! The machine at least POSTs now and I can get into the BIOS.

In summary (and to capture this post in search results for others to find), connecting a Dell 2405FPW 24 monitor into the onboard Intel Extreme Graphics of an Asus P5K-VM motherboard appears to cause the motherboard to refuse to POST.

Next up - install!

Server Meltdown Part Two

Following on from yesterday's post about my home server's meltdown, let's just say that the day didn't exactly end well. At around 11pm, the Debian install onto the second PowerMac hung when setting up some component. It was time to give up for the night.

This afternoon I decided that I'd had enough of trying to build a central service from recycled components and gave Hard Drives NorthWest a call. I've had a number of good experiences with these folks in the past, so I thought I'd just customize one of their standard systems. I picked a Core 2 Duo based machine with 4GB of RAM and a 320GB drive. Not bad for just over $500.

Anyhow, on with the install.

9.22pm - Everything unboxed and plugged in. Ubuntu install disk at the ready. Boot!

10.31pm - The machine won't even post. Just a single flashing cursor on the screen. I tried reseating the RAM, draining the CMOS. All to no avail. I can't even get it into the BIOS. Back we go to Hard Drives Northwest in the morning.

Sigh. This shouldn't be this hard. It never has been before and I've built plenty of machines. Maybe it's just that now I've turned 40, technology hates me.

To be continued. Again.

Server Meltdown - A Tale Of An Upgrade

Today I came home to find that the linux box that provides all services to the machines around the house was wedged. I powercycled it, but it wouldn't come up - the drive had suffered some kind of fatal failure.

Oops.

Now, this machine is pretty central to operations here at Casa Del Lacey. It provides NTP, DHCP and DNS services as well as acting as the Windows Primary Domain Controller via Samba. Handily everything else can limp along without it, but it's not pleasant.

Good job everything backs up nightly to the Infrant NAS.

Anyhow, for a while I've been thinking of replacing the hardware that the server runs on. It's a PowerMac G5 running Debian linux, but the fact that it's a PowerPC machine rather than an x86 machine has increasingly become a pain.

Handily I have a Dell PowerEdge SC1420 (64bit Xeon) sitting around that's been switched off and gathering dust for almost two years.

Don't ask.

So, with the PowerMac's hardware meltdown and the fact that I've got a reasonably good x86 box sitting around, it must be time for an upgrade. I have an Ubuntu 7.10 x64 desktop install disk in my hand, the kids are in bed and it's time to start!

9:00 pm - Disk in drive, power up!

9:42 pm - The damn thing won't power up. Das blikenlights claim a power supply failure. Poo. Not to fear! I have yet another spare machine. Last time I tried it there were “some issues”. Yup. Issues are still there. Poo2.

9.43 pm - Grab a cold beer.

9.45 pm - What the hell. I have a spare PowerMac G5! Let's go with that. It powers up! Now I need a Debian PowerPC disk…

10.18pm - ISO downloaded and burnt.

To be continued…

MarsEdit Now Supports Tags

I'd stopped using MarsEdit to create my blog posts and dropped back to using the online web form as it didn't support the new tags property in MoveableType.

Now it does!

Sweet. I wonder if this works…

Persistent Storage for Amazon EC2 Services

Talk about serendipity…

I was just talking about using EC2 and S3 for backups and along comes a solution to actually make it easier to build.

Without persistent storage, it would be hard to persist the backed up data to S3 as you'd have to do the file to S3 mapping (I think) by yourself. With this feature, you effectively create a blob of S3 storage and use it as a drive in your EC2 machine instance.

Nice.

Actually, that's how I thought it worked all along, but was weirded out earlier today when I found out that it didn't.

Well, as of 9pm tonight it does.

Serendipity.

Backups Moved To Amazon S3

Previously, I've been backing up all the irreplaceable household data (movies, photos, etc…) to my colo'd server using Scott Ludwig's most excellent Link-Backup script.

Unfortunately I've been running out of space on that server and am thinking about decommissioning it, so as the first step of the decommission I need to move my offsite backups somewhere else. The obvious place appears to be Amazon's S3 service as the price of storage seems very cheap - $0.15 per gigabyte. There are also transfer charges, but in the general case it's upload only, so I'm ignoring that. I have about 100GB to store, which works out at $15 per month.

Very reasonable.

The next thing to figure out is “how do I perform the backup?” I initially thought that the easiest thing to do would be to continue to use Link-Backup. All I need to do is bring up and EC2 instance every time I need to backup and then use Link-Backup as I had been doing previously.

The big problem with this was that bringing up an instance is not trivial. Relatively simple, but not trivial. Also, the EC2 tools require Java 1.5 to run and it's not available on PPC Debian linux. Sigh.

I then dig a search around and found Jeremy Zawodny's excellent blog post on the subject which provides a nice roundup of the available solutions. I decided to go with the ruby based s3sync.

Set up was pretty simple. I first created an AWS account, collected the required data and configured s3sync. I then created some scripts as suggested by John Eberly and I was off to the races!

I ran some tests to make sure I could:

  1. Backup a small directory that had some hierarchy in it.
  2. Restore that directory.
  3. Make some small changes to the local directory and make sure that only the changes were synced.
  4. Pull back a single file using the included s3cmd script.

It all worked perfectly, so now I have ~70GB of photos syncing up to S3.

Sweet!

Next steps:

  1. Add everything else (home movies, etc…) to the backup
  2. Rebuild my little webapp using Google's AppEngine.
  3. Move my blogs somewhere else (maybe Media Temple - an opinions? I need to run MovableType and MySql).
  4. Decommission server.
  5. Use saved cash to buy more toys.

Sounds like a plan.

A Couple Of Great TED Videos

One thing I like about the short flight from Seattle to San Jose is that I get to catch up on a bunch of TED videos.

Two of the videos I watched on yesterday's flight really stood out for me:

Definitely worth watching. Enjoy.

© 2001 to present, Steve Lacey.