Luckily, for most systems with up-to-date software runnning on them, this is actually quite easy to achieve.

The following method worked for me but please be careful when doing this on your own system as it could cause irretrievable loss of data.

As a result create a full backup before attempting this.

The following assumes you are only running one instance that you want to upgrade, but the principles apply whatever. It was carried out on an Amazon Linux 64 bit image (originally 8GB, resized to 250GB) which had all software updated via yum update before starting.

Take a backup and create a load balanced system - if you're not already using one

1. Create an AMI of your current running instance, this acts as a perfect backup of your current system and allows to deploy a copy to test this process with.
2. Launch a new instance from the AMI you just made
3. Create an ELB with this new instance behind it and update your app, DNS whatever to filter traffic through the ELB
4. When you're sure your new instance is taking the traffic for your app add the existing instance to the load balancer, so you're now load balancing across both instances. Having two instances to work with allows us to avoid down time as instance two can take the traffic while we work on instance one.

Resize the hard disk

1. Stop the instance: AWS Management Console -> EC2 -> Instances, Right click instance name and choose "Stop"
2. Note down the name of the volume attached to the instance: AWS Management Console -> EC2 -> Instances, click the instance name and click the link next to "Block Devices" in the panel (e.g. labelled sda1) which gives you the detailes of the selected instance. Note down the "EBS ID" value (e.g. vol-12a3599a).
3. Create a snapshot of the current HDD: AWS Management Console -> EC2 -> Elastic Block Store -> Volumes, search for the EBS ID you noted down, right click it and choose create snapshot. Also note down the device name from the Attachment information column, this will be something like /dev/sda1
4. Switch to the snapshots list (AWS Management Console -> EC2 -> Elastic Block Store -> Snapshots) and look for the one with a status of pending - this is your new snapshot being created. Note down the Snapshot ID and wait for the operation to complete.
5. Go back to the volumes list: AWS Management Console -> EC2 -> Elastic Block Store -> Volumes, and hit create volume. Set the disk size you want and select the snapshot from the list with the ID you noted down.
6. Wait for the volume to be created (you should be able to sort the volume list by status and see one which is available to find it if you have a lot of volumes).
7. Disassociate the existing volume from your instance: Right click the volume you created the snapshot from and choose disassociate.
8. Attach the new bigger volume to your instrance: Right click the availible volume you created and choose associate, select the instance you want to attach it to from the list and enter the device name as that which you noted down earlier (e.g. /dev/sda1). Note though this may be the original device name, when started back up this may be renamed to something /dev/xvda1 on the instance itself due to the way modern linux kernels reference the devices.
9. Start your instance: AWS Management Console -> EC2 -> Instances, Right click instance name and choose "Start"
10. ssh into your instance and confirm that the instance now has more space availible. To do this run fdisk -l /dev/xvda1 (replacing /dev/xvda1 with your device name). You should get something back like this:Disk /dev/xvda1: 268.4 GB, 268435456000 bytes
    255 heads, 63 sectors/track, 32635 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00000000
11. However if you run something like df -H you'll see that the partition still currently has the size originally allocated to it, so we have to expand the partition to cover the additional space

Expand Your Partition

1. Check your instance file system type by running: fsck -N /dev/xvda1
2. If it is one of ext2, ext3, or ext4 you can use resize2fs to expand the filesystem into the availible space. You can do this with the instance running if your file system is ext3 or ext4 and you're using kernel version 2.6+ by simply executing something like this (this example resizes to 240Gb):resize2fs /dev/xvda1 240G
3. Other filesystem types have different on-line (running instance) resizing capabilities and you should check the man pages for your filesystem to check which you should use.
4. After a short amount of time your instance should be able to access the extra space. At this point I generally like to reboot my instance to ensure clean running but this is probably unnecessary.
5. Add the instance back into your load balancer if it's not there already and when happy remove or update the other instance and remove the ELB if required.

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So, here's how to do it (assuming you already know how to setup cloudfront to stream a video):

1. Install the latest version of the JW Player Plugin (Plugins -> Add New -> Search for "JW Player Plugin for WordPress")
2. Activate the plugin, you'll notice that a new menu called "JW Player" appears in your admin area
3. Click on JW Player, you'll get a list of the players which currently exist (each player being a different customisation of the default JW Media Player)
4.  Click the copy button next to the out-of-the-box player to create a new player you can customise. Rember to give the new player a meaningful name instead of the default "out-of-the-box_copy". In my case I'm going to call this player "Test"
5.  Edit any of the player settings you like to create your new player (but don't click save - yet - if you do just click the edit button next to your new custom player to re-open the interface)
6. Click the Advanced Settings tab of the player editor, scroll down the page until you see the streaming section and enter "rtmp" (without the quotes) in the provider box and the url to your clodfront streamer in the streamer box. e.g. if I setup a streaming distribution with the cname "videos.coderchris.com" my streamer url would be "rtmp://videos.coderchris.com:1935/cfx/st" that said you could just use the cloudfront default url for your distribution e.g. "hjh4887yh7h7.cloudfront.net" which would have the this streamer url: "rtmp://hjh4887yh7h7.cloudfront.net:1935/cfx/st"
7. Now JW player knows where to stream your video files from you need to embed them in the page, which is best done using the jwplayer shorcode. So assuming I uploaded a video called "My Test File.mp4" to the S3 bucket feeding the cloudfront distribution and have set it's permissions to be public then I should be able to enter the following shortcode into a post or page "[jwplayer config="Test" file="My Test File.mp4"]" and that's it!

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Not ideal, and as most people found out, the fix for this was to add 'fallback_cb' => false to the wp_nav_menu() calls in their theme, however for me, and some other people, this didn't fix the problem alone.

In fact as well of this, for some people, including myself, it seems that the wordpress upgrade ALSO removed the association between menu locations and the custom menus themselves from the database (i.e. The values set in the "Theme Locations" section of the menu editor were lost.

So, if you're still having issues with custom menus in wordpress, and your code for creating them and including them in your theme appears correct, check the menu editor and see if you need to re-associate your menus to your theme locations!

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I didn't however know that this technique had a name: Rolling Thunder (Thanks AWS Tech Summit)

As it was such a cool buzz wordy term, I thought I'd post a guide to how I achieve Rolling Thunder on AWS using CentOS Linux based instances (though this should work with any *NIX variant) in case anyone new to the game wanted a how-to.

The method is as follows

1. Clone a running live instance of your web app to use a test server
2. Set up a private S3 bucket in which to store the source code for your web app(s)
3. Zip up your source code into an archive file (this makes the permissions management of the source code of multiple apps, or versions of multiple apps easier on S3 BUT you could simply use the bucket to store an export of the latest version of your code)
4. Upload your source to this bucket using the AWS web tool or (better) setup a sync using a tool such as cyberduck Remember to set permissions appropriately on all uploaded files i.e. don't make anything public, but don't remove your rights to access the uploaded content either!
5. Log into your test instance and install the latest version of the fuse filesystem using the following instructions (these are all cli commands):

   yum remove fuse fuse* fuse-devel
   
   yum install gcc libstdc++-devel gcc-c++ curl curl* curl-devel libxml2 libxml2* libxml2-devel openssl-devel mailcap
   
   cd /usr/local/src
   
   wget "https://downloads.sourceforge.net/project/fuse/fuse-2.X/2.8.4/fuse-2.8.4.tar.gz?r=&ts=1299709935&use_mirror=cdnetworks-us-1"
   
   tar -xzvf fuse-2.8.4.tar.gz
   
   rm fuse-2.8.4.tar.gz
   
   mv fuse-2.8.4 fuse
   
   cd fuse/
   
   ./configure --prefix=/usr
   
   make
   
   make install
   
   export PKG_CONFIG_PATH=/usr/lib/pkgconfig:/usr/lib64/pkgconfig/
   
   ldconfig
   
   modprobe fuse
   
   #confirm that 2.8.4 is the version displayed
   
   pkg-config --modversion fuse
   
   #set the fuse files system to load on startup (make the kernel module load)
   
   echo modprobe fuse >> /etc/rc.modules
   
   chmod +x /etc/rc.modules
   

6. Install s3fs, using the following instructions (these are all cli commands):

   wget http://s3fs.googlecode.com/files/s3fs-1.40.tar.gz (get URL for latest version)
   
   tar -xzvf s3fs-X.XX.tar.gz
   
   rm s3fs-X.XX.tar.gz
   
   mv s3fs-X.XX s3fs
   
   cd s3fs
   
   ./configure --prefix=/usr
   
   make
   
   make install
   
   

7. Create an /etc/passwd-s3fs file, and add a single line like this:

   accessKeyId:secretAccessKey
   

   Obviously replacing accessKeyId:secretAccessKey with access credentials for your AWS account

8. chmod this file to 640 for security (s3fs won't work unless permissions are set at this level)
9. Test that you can mount the s3 bucket as a filesystem folder by running the following commands (these are all cli commands):

   mkdir /thunder
   
   #test if /thunder is a mountpoint (it shouldn't be)
   mountpoint /thunder
   
   #mount the bucket
   /usr/bin/s3fs my-bucketname /thunder
   
   #test again (it should be a mountpoint now)
   mountpoint /thunder
   
   #try listing the source files you uploaded to the bucket
   ls /thunder
   
   #unmount the bucket
   umount /thunder
   
   #show that the files no longer exist in /thunder
   ls /thunder
   

   Note: as a test you might want to try writing a file inside /thunder too to do this use your favourite text editor or an program like touch, and then look for the file's existence in s3 throught he web interface, or cyberduck, or whatever

10. Next install Rsync (again, this is a cli command):

    yum install rsync
    

11. Then write a script to use rsync to update your web-app's code directory e.g. /var/www/html/ with the source code from the s3 bucket. Here is an example of the kind of script I use:

    #!/bin/sh
    
    ############
    #  Config  #
    ############
    
    archive_name=my-sourcecode-archive.zip
    
    #################
    #  Main script  #
    #################
    
    #output the start time
    echo 'Started: '
    date;
    
    #make a backup of your existing web app directory
    #this is just a precaution but can be useful for versioning deployments on the instances
    ts=`date '+%d-%m-%Y_%H-%M-%S'`
    cp -R /var/www/html /var/www/html_rt_bak_$ts
    
    #initialise the fuse filesystem
    modprobe fuse
    
    #check to see if /thunder is a mountpoint, if not mount it
    mountpoint /thunder/ || /usr/bin/s3fs source-a /thunder
    
    #copy and extract the zip file into /tmp/thunder, then remove the original archive
    mkdir -p /tmp/thunder
    cp /thunder/$archive_name /tmp/thunder/
    umount /thunder
    
    cd /tmp/thunder/
    unzip $archive_name
    rm /tmp/thunder/$archive_name
    
    #remove any stray .svn files/folders
    find . -name ".svn" -type d -exec rm -rf {} \;
    
    #rsync the contents of /thunder with /var/www/html
    rsync -avI --exclude-from=/tmp/thunder/thunder-exclude-list.txt /tmp/thunder/ /var/www/html/
    
    #remove the temp dir, and the exclude list
    rm -rf /tmp/thunder
    
    #chown and chmod everything to ensure synced files have the correct permissions
    chown -R apache:apache /var/www/html
    chmod -R 754 /var/www/html
    
    #output the end time
    echo 'Finsihed: '
    date;
    
    

    Note: The rsync exclude file. This is a file I put into my web app home directory that allows me to exclude various files from the rsync process, which can be useful to avoid copying files such as database connection settings or the source code archive itself into the web root. By making the exclude list a file in the web app, control of what's synced can be easily managed by the developer on upload of the source code to S3 rather than requiring extra edits to server side scripts on every instance.I tend to store my scripts in a /scripts directory and in my case I've called this one rolling-thunder.sh Remember to run a command such as this to make the script executable once written:

    chmod +x /scripts/rolling-thunder.sh
    

12. Next add this script to the startup sequence for your instance. There are a number of ways of doing this, but I choose to add it to the /etc/rc.local file (which is for executing user commands after the main system has started up). All you need to do is open /etc/rc.local in a text editor like nano and add a line like this to call your shell script:

    /scripts/rolling-thunder.sh > /var/log/rolling-thunder.log 2>&1
    

    Note: The additional line after the call to the script

     > /var/log/rolling-thunder.log 2>&1
    

    Creates and sends all output caused by the script (including errors) to a log file called rolling-thunder.log, which can be useful for debugging any errors that may occur

13. Reboot the test instance and take a look at your rolling-thunder.log file and check your web app code, your update should have been deployed smoothly!
14. Last, create an image of this instance to allow you to fire up further instances as necessary.

Notes:

• s3fs seems to start to choke when a single directory contains more than 1000 files, I think this is because of the time it takes to produce the list and parse it. Another good reason to package the code up into an archive
• Example thunder-exclude-list.txt ** are standard wildcard matches:

  *my-sourcecode-archive.zip*
  *thunder-exclude-list.txt*
  */some/specific-file-to/exclude.php*
  */some-folder-to-exclude/*
  

• A better deployment option for easy management/automated instances is to break the rolling-thunder.sh script in two and have the main part which does the sync sitting on s3 or in the deployment archive and a minimal script sitting on the server which calls that script. This route would give yet more flexibility/control on the deployment front from a central location as opposed to having to edit the deployment script on multiple servers

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It's a couple of years old now and there may well be a more up to date version out there, but I've just stumbled up on it so I thought I'd repost it here for anyone else who needs a reference/is looking into AWS structure and security for their applications.

http://s3.amazonaws.com/aws_blog/AWS_Security_Whitepaper_2008_09.pdf

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I set the paths to the libs I knew about but, post build, the software was failing to run correctly even though I followed the installation instructions to the letter.

Thankfully I had strace installed on my system and by using a single simple command I was able to get a trace of the program’s activity across the system and find out what it was missing where.

A symlink later and everything was fixed!

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1. Note down the instance id of the instance you want to add more storage to
2. In your AWS account go to the volumes link (under Elastic Block Store) click the Create Volume Button and choose how big you want this device to be.
3. Attach the new EBS volume to your instance by right clicking it and choosing Attach Volume. Select the instance id from the list that you noted down in step 1. and give the new device a name to reference it on the instance, e.g. /dev/sdf
4. Login into your instance on the command line and do and run (# represents the command prompt):
   # ls /dev
   You should see that /dev/sdf has been created for you
5. Format /dev/sdf by running:
   # mkfs.ext3 /dev/sdf
   It will warn you that this an entire device. You should type y to allow the process to continue unless you want to create specific partitions on this device
6. Create a directory to mount your new drive as on the filesystem, for example we’ll use /files:
   # mkdir /files
7. Add a reference in the fstab file to mount the newly formatted drive onto the /files directory by running the following command:
   #  echo "/dev/sdb /files ext3 noatime 0 0" >> /etc/fstab
8. Mount the drive by running:
   # mount /files
9. Check your drive has mounted correctly with the expected amount of file space by running:
   # df -h /files

It really is that simple, within a few cli commands you can simply add 1GB to 1TB of storage at the drop of a hat!

Questions? Leave me a comment and I’ll do my best to answer them for you

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Basically, in network terms, as the instances sit behind the firewall and the firewall behind the load balancers, if you terminate the SSL at the load balancer, what exposure is your data at risk of between the load balancer and the firewall?

Amazon's response (though lacking in actual detail) is that data is secure between the load balancer and the firewall, though post termination it is transmitted in clear text (as you'd generally expect). You can see the original question and response here: https://forums.aws.amazon.com/message.jspa?messageID=209121

So all in all Amazon are saying that their load balancer-to-firewall connection is secure.

As they don't give any detail, to a point it depends on how much you trust Amazon on this issue but in my opinion if you're going to implement an SSL termination process on this scale and exposed to this level globally you're gonna do it properly, and if it does has security flaws it's going to be a marketing disaster for your service.

So, all in all, though I don't like not knowing the specific process they use, in future I'm going to trust it for most cases (though all the while keeping an eye out for related reported issues or concerns).

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After a bit of digging I found this: http://bugs.mysql.com/bug.php?id=2826

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Thanks to recent improvements over at Amazon, you can now add items to your wishlist from ANY website! How cool is that? All you need to do is drag this bookmarklet to your browser and you'll be free to add any item to the list of stuff you want!

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I love web stats and for a long time now (last 4 years or so) I have been analysing web stats with Google Analytics, which is probably one of the best apps for assessing basic stats (provided the web browser being used support javascript). For the most accurate stats I also use AWStats (which has provided great results for the last 7 years) Within the last year or two I have also employed the use of ClickTale for the analysis of user interaction. Today however I found this website which provides another potentially very useful tool/method to add to the web analysis arsenal which essentially allows you to render your website access logs as a network diagram allowing you to visualise user paths through your site in a way that was only really possible through intuition. The article explains a lot more on how to do it but it's certainly something I'll be giving a try in the next few days!

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How to visualise your webserver logs as a map of user progression through your site content

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A really useful tool for providing simple stylised views of apache webserver log files via the browser. Ideal for providing a level of log file monitoring/analysis to novice web developers or website owners who don't want or need to see the raw log file text, but might need to keep occasional tabs on how the webserver is behaving as part of a bigger website control panel style app. Though somewhat useful for picking through the access logs, applying it to the error logs is where this becomes particularly useful

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Really interesting project. Combined with an appropriate backend this may well be useful tool for anyone wanting to implement the kind of product customisation features you find on printshop websites such as cafepress, etc.

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SVG-edit - A complete vector graphics editor in the browser

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Nuff said...

Actually while I'm on the topic (mainly of IE being an idiot)

http://code.google.com/p/ie7-js/

In addition, for up to date browser usage stats (and in theory the most correct stats):

http://www.w3schools.com/browsers/browsers_stats.asp

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1. How to visualise your webserver logs as a map of user progression through your site content I love web stats and for a long time...
2. Google Chrome – Released But Not Polished? Google chrome is a new lightweight browser released by...
3. SVG-edit – A complete vector graphics editor in the browser Really interesting project. Combined with an appropriate backend this...