Category Archives: Techie Stuff

Raspberry Pi Webserver

The Need

We host free seminars on backup & recovery and virtualization each year.  We decided to lessen our paper dependency this year and provide the presentations via a pdf file instead of a printed booklet, as we had been doing for the past couple of years.

We wanted a solution that would easily serve files to people at our seminars.  Our options were to put the files on 1) thumbdrives, 2) an internet available server, 3) one of our laptops/phones/iPads running a webserver, ftp or some other means of filesharing, or 4) a dedicated device.  Also, we are limited on the amount of gear we can take on a trip, as we only have 2 suitcases for gear.  I’ll review the options, why I settled on the one I did, and how I configured it.

Option 1: files on a thumbdrive.  We could have put copies on thumbdrives and handed that out to everyone, but I wasn’t too keen on that due to price and hassle of keeping updated copies of presentations on large numbers of devices.  We do bring a handful of thumbdrives in case anyone has trouble downloading the file.

Option 2: internet available server. Easiest thing would be to have a page on our website and point people to it, updating the pdf for each city. However, internet access at hotels (where we do the events) is flaky at best, often non-functional. I do carry around a MiFi device to provide internet access in the event the hotel’s access is too horrible. However, our average attendance is 50 people and the average pdf size is about 50 MB, so that would be 2.5 GB of data downloaded in one city, at the painfully exorbitant prices that MiFi providers charge. And it is not unusual to be in a hotel where I can’t get any sort of MiFi signal, so I didn’t want us to be dependent on that.

Option 3: running something on laptop/iPad/Phone. This has the distinct advantage of not bringing another piece of equipment into play, as it would just run on one of our devices that we are already bringing. I didn’t really want to run a solution on multiple devices or have to worry about battery life/connectivity for iPads or phones, though I could have gotten around those. I really didn’t spend much time on this.

Option 4: dedicated device. This is what we settled on, though we struck out with our first device. I wanted something small and lightweight due to my luggage constraints. Our first attempt was with an iUSBport by HyperDrive. I created a webpage that had a link to the file and to pdf readers and put that and the pdf file on a usb drive and had a URL for people to access the file. We even wrote a script to simulate dozens of simultaneous downloads and thought we were good to go. As with many things, production use managed to bring out the worst and did not follow our testing experience. The iUSBport is strictly wireless, and though it was on a local network created by our cradlepoint router and users did not go out over the internet to access, it still ended up feeling like it was behind a dialup connection halfway around the world. That ended the use of the iUSBport.

Enter the Raspberry Pi

The Raspberry Pi is a credit card sized motherboard. Load the debian-based OS on an SD card, put it in a small case and you have a $60 webserver.  It weighs 2.6 oz and is 3.5″x2.5″x1″ in the case. It comes with 512 MB of RAM and a 700 Mhz ARM processor.

Raspberry PiRaspberryPibackside

An SD card serves as the disk drive and we opted for the mini-SD card and converter, so that it would fit in the slot and not stick out of the case.

MiniSD-w-adapter

Configuring the Raspberry Pi as a webserver

I basically followed a modified version of this WikiHow, http://www.wikihow.com/Make-a-Raspberry-Pi-Web-Server.

There are guides and instructions on the download site in step 1 below; you will need to select which method works for you. My steps, run on my Mac, were:

NOTE: Don’t blindly follow the steps below and blame me if something goes wrong, you do need to understand what you are doing. For instance, using dd incorrectly can really mess things up, as it will rewrite all data on whatever target you specify. Follow the guide for beginners in the download link for detailed explanations.

  1. Download Raspbian “wheezy” http://www.raspberrypi.org/downloads
  2. unzip and dd image to SD card
    1. Used df -h to figure out correct disk name of SD card, removed s1 at end and replaced disk with rdisk
    2. unmounted SD card, sudo diskutil unmount /dev/disk2s1
    3. sudo dd if=2012-12-16-wheezy-raspbian.img of=/dev/rdisk2
  3. Either add sudo in front of each of these commands or run sudo su, then run each of these.
  4. mv /boot/boot_enable_ssh.rc /boot/boot.rc (enables ssh)
    dpkg-reconfigure tzdata
    apt-get -y update
    apt-get -y upgrade
    apt-get -y install ca-certificates
    apt-get -y install git-corewget http://goo.gl/1BOfJ -O /usr/bin/rpi-update && sudo chmod +x /usr/bin/rpi-update
    rpi-update
    shutdown -r now
  5. Next set need to be run with sudo as well
  6. apt-get -y install apache2 php5 libapache2-mod-php5
    groupadd www-data
    usermod -g www-data www-data
    groupadd www-data
    usermod -g www-data www-data
    service apache2 restart
  7. I then copied over the files I wanted to share to the webserver root and was ready to go

I also set a static IP, so that our documentation wouldn’t need to change, we simply point people to the 192.168 address that gets assigned by the cradlepoint router we use. For each city, I merely scp over the lastest pdf file.

For a backup, I pulled the SD card out of the Raspberry Pi, used dd to copy it over to my laptop, gzipped it up to take up less space and now have an image-based copy that I can dd onto a new SD card, complete with webserver and desired IP.

Summary

The Raspberry Pi has been a great solution for us.  It has a small price tag, weighs next to nothing, requires only a short ethernet cable for access and a short usb cable for power.  What more could I ask for?  (Don’t worry, I’ll think of something).

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Easy Hard Drive Upgrade with Mac

I’ve been limping along with my little 128 GB SSD drive on my MacBook Pro.  (That statement still seems odd to me considering that my first hard drive upgrade, ages ago, was to a 30 MB hard drive that my sister told me I’d never be able to fill.)  My kind boss felt sorry for me and sprang for a new, roomy drive.  I received my new 500 GB SSD drive and went straight to swapping hard drives, which was incredibly easy.  The steps I took were:  1. made sure my backups were current, 2. swapped hard drives, 3. restored my OS using Time Machine, 4. reinstalled my Windows Boot Camp using Winclone and then 5. checked to make sure everything was working.

Step 1: Ensure Backups are Current

This could be as simple on a Mac as clicking on the Time Machine symbol on your menu bar:

I have an external drive plugged in, so backups are updated every hour.  I verified that mine was only a few minutes old, then checked on my external drive for a current Winclone backup of Windows running on Boot Camp and then verified that I had an up-to-date backup with CrashPlan, ’cause I’m just that paranoid.

Step 2: Swap Hard Drives

I use ifixit.com for things like this, they have nice step-by-step instructions, complete with pictures.  For my laptop, I used this guide, http://www.fixit.com.

The oddest thing I ran across was the bizarre screws (Tri-wing Y1 screws) used to attach the battery, I’ve never seen them anywhere before.  Even my cool little screwdriver with combo phillips #00 and T6 torx bits doesn’t have that.

Moving slowly and being careful not to touch the motherboard (since I couldn’t remove the battery), it still only took me about 10 minutes to swap the drives.

Step 3: Restore OS with Time Machine

This part is super easy, only made difficult by the fact that we have 4 different MacBook Pros in our office and, apparently, they each have their own distinct install disc.  Yes, this could have been made a non-issue by taking 10 seconds to use a sharpie and write some comments on each disc.  Since we didn’t do that, I grabbed what I thought was the most logical disk to use.  Silly me, thinking I could just use a Snow Leopard disc.

I did learn a new way to eject discs; when Command-E and the eject button don’t work, you can push the track-pad button while rebooting.  Turns out that rather than saying “this is the wrong disc, idiot”, Mac simply decides to keep the disc and not allow normal eject methods to work.  Kind of like what a London bank ATM did with my bank card after one failed PIN attempt.  Nice.

So, after finding my specific Mac OS X install disc, I did a boot to the disc, chose ‘Restore System from Backup’ from the Utilities menu, selected the backup volume and the Time Machine backup I wished to restore to (most recent).

It says 2 and a half hours in the picture above, but it turned out to only take about an hour and a half.  While this churned away, I got started on an all day patch extravaganza of our new HP Windows 7 laptop (for the new sales guy).

Step 4: Restore Boot Camp Partition with Winclone

I would have been done at this point, except that my Windows install uses Boot Camp.  I’ve been a fan of Winclone for a couple of years now, though it turns out they stopped development and decommissioned their website!  I understand someone has released an unofficial copy of Winclone 2.3, which is supposed to support Lion (I believe you can just edit the appropriate plist file to ignore the version check if you want to continue using Winclone 2.2).  See my side rant below.

To restore Windows, I opened the Boot Camp Assistant, told it I have the Mac OS X install disc, then chose Create or remove a Windows partition, and then set the partition size to 40 GB.  I did not format the drive, as Winclone will do this for me.

I’ve used Winclone before when increasing the size of my Boot Camp partition.  I simply blew away the partition with Boot Camp Assistant, increased the size, and then restored using Winclone.  I did the same thing here with my hard drive swap.  To perform the restore, you choose the restore tab, pick the backup file to restore to and choose the Boot Camp partition as the destination, unless you really want to repeat step 3 above.


Side Rant

I must have been snoozing or something, because I had no idea the developers of Winclone over at twocanoes.com were in trouble or were even considering abandoning Winclone, which they did sometime in 2010.  However sad that may be, why in the world did they just dump it?  Seems like it would have been just as easy for them to move it to source forge and turn it over to someone else.  I’m not aware of any program that replaces it, so it’s not like they gave up due to the competition.  So, my rant?  If you’re going to stop developing a free product that lots of people use, at least put it up on source forge and ask someone to take it over.  For me, moving forward, I figure it’s just as easy to simply dd the partition to an external drive.  That could even be scripted and run from cron.

Hmm, if only there were some site that would discuss how to do things like that, such as  backupcentral.com (this link points to an online version of the Linux and Windows Bare Metal Restore chapter I wrote in W. Curtis Preston’s book, Backup & Recovery).

Step 5: Verify Everything

It should be pretty obvious if the restore succeeded or not.  If things are all wonky and restoring to a different backup in Time Machine doesn’t work, then you will be stuck with a re-install of the OS, followed by restoring data from a backup (maybe the file restores will work from Time Machine or maybe you have another product grabbing files, like I do with CrashPlan).

For me, everything was working fine, except for a couple of things, one of which is minor, the other turned out to be a non-issue.  One was Microsoft Office and the other was my Parallels version of Windows.

Microsoft Office had two issues, a database index that it said it needed to rebuild, and a prompt requiring me to re-enter my product key.  Both of these were pretty minor, though still unexpected.

The other issue was Parallels.  I use Parallels to run my Boot Camp version of Windows as a virtual machine while running Mac OS.  However, after my recovery, there was no Parallels applications folder in my dock and the pvm file was missing to start-up the virtual machine.  There is an option within Parallels that says “Don’t backup with Time Machine” and I’m pretty sure I checked that way back when I set this up, since I’m using Winclone.  However, I’m not sure of that, and it’s not the default.  So, I simply went to CrashPlan to restore the pvm file, but discovered that it was 30+GB, which didn’t make sense, since it should just be a small file around 25 MB pointing to the Boot Camp location.  All I did was start-up Parallels, choose “New” and point it to the Boot Camp Partition, then I was back in business.

The nice thing about testing your restores with a hard drive swap is the built-in fallback should it have failed.  I could have gone back to my puny little 128 GB drive.  Good thing I didn’t have to do that!  Who lives with such small drives these days? ;)

Microsoft System Restore Failure Leaves Me Hanging

So, I’m minding my own business, just getting ready for another seminar, setting up our one and only Windows laptop to our projector when Power Point decides to crap out.  Reboots didn’t help and time was running short.  No problem, right?  Just roll back to a previous restore point and I should be fine.  Well, that didn’t turn out to be true.  I’m actually not that torqued that rolling back didn’t fix anything, I’m torqued that the rollback failed and the chose to wipe out all my other restore points!

I chose a restore point that was just before the last Microsoft update, thinking that may have been the culprit and knowing that everything worked fine the last time I used the laptop.  However, the system restore failed with an “unspecified error” and told me I should disable my antivirus and try again.  It then informed me it would have to undo the attempted restore.  Ok, sure, why not?  Here’s the fun part; the system restore got to the end of the rollback, failed and spit out an error that says something to the effect of “unable to rollback from system restore since the system restore did not complete correctly”.  That’s genius!  So, I have to rollback due to a failed restore, and simultaneously can’t rollback due to the same failed restore.  Oh, and just for good measure, we’ll destroy all the other restore points that were there so that you can’t use any of those or attempt to do this again.  Nice.

If you were wondering, the antivirus I run on this laptop is Microsoft Security Essentials, which apparently Microsoft System Restore doesn’t know how to interact with.

End of the world?  No, we proceeded with our broken PowerPoint and showed our video clips outside of PowerPoint and lived without answers to all of our audience response slides.  Once back home, I was able to uninstall and reinstall Office 2007 and get things working again (no, repair didn’t work).  I also had an image I could have used to perform a bare metal restore, though I failed to bring it along on my external drive.  It wouldn’t have mattered as I didn’t have an hour or two to wait for a bare metal restore.  I have, however, managed to get the audience response system(the only reason we need to run PowerPoint on a Windows computer) working on Windows running on Parallels on two of our Macs, so I have multiple redundant systems moving forward.

Backing Up With CrashPlan

We moved into our new office in February of 2011.  One of the first things we did was to get our lab back up and running (well, after installing the new fridge to cool my soda).  Having heard good things about CrashPlan, we decided to give it a test run.  The short version of the story is: it’s easy to install, administer, restore from and even easier to migrate to new hardware than I originally anticipated.

Environment

Just a quick review of our environment. We are backing up 2 Macbook Pro laptops and 1 iMac using the free version of CrashPlan.  We are backing up to a Windows 7 box in our lab with a 16TB Drobo attached to it.  Yes, we could have backed up each laptop to the CrashPlan site and not had to point it to our own server and storage, but where’s the fun in that?  We may add that functionality in the future.

This is not intended as an in-depth review or detailed walk-through of the product.  I was actually impressed with the ease of migrating to a new server and decided to share my experience with the product.

Installation and Use

Installation on all 4 machines (the macs and the backup server) took only minutes and was a simple process.  The initial backup to our local server took the better part of a few days to complete, mostly because one of us actually has some 200+ GB of stuff on his 500 GB drive (I can “name fingers and point names”, but we’ll just say his name rhymes with Wurtis).

Restoring a file was as simple as walking through my filesystem in the CrashPlan GUI and selecting the file to restore, which restores the most recent copy to the Desktop by default, but it is easy to click and change which version and where to restore.  I even did a restore while the backup was still running.

I’ll note here that administration with this version is rather minimal, as it was designed for personal backups, CrashPlan Pro is really where you would go to manage backups for multiple computers.  With the version we have, I can see the status of all 3 laptop backups only if I log into CrashPlan on the backup server, and only get notifications for backups of my own laptop.

Migrating to New Hardware

Ok, so this would not have been a problem I would have to worry about if I had simply enabled the offsite feature and backed up to the CrashPlan site.  However, there would not have been as much to test or play with had we gone that route.

The problem was our backup server which started to flake out on us.  Since it is running on hardware that wasn’t exactly the newest and fastest when we bought it some 3 or 4 years ago, I didn’t even bother trying to spend much time troubleshooting and fixing. I just bought a new box from Fry’s.

Once I had gone through the 5,000 or so windows updates/patches, I installed CrashPlan on the new server, shutdown CrashPlan on the old server and moved the Drobo to the new server.  I was anticipating re-configuring each of the 3 clients to point to the new server and having them re-sync themselves.  I knew they wouldn’t need to start over on the backups since we essentially have the backups seeded on the Drobo.  I was pleasantly surprised to learn that it was even easier than that.  Once I started CrashPlan on the new server, and signed in with the same account as the old server, it showed me both computers the account was assigned to and asked me if I wanted it to take over (adopt) backups for the other computer.  Why yes I do, thank you very much!  That was all it took.  Backups resumed for all 3 clients with no additional configuration needed.

Summary

As I said, easy to install, easy to restore from and even easy to move to new hardware if you’re using the onsite option.