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| − | = Overview =
| + | [http://wiki.littlesvr.ca/wiki/OPS345_Assignment_1 This page has moved.] |
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| − | In this assignment you'll use many of the skills you learned so far to set up several Apache web servers with a lame load balancer. It won't be even close to production-ready but you will get more practice with the basics, which is what you need most now.
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| − | This assignment assumes that your www.youruserid.ops345.ca is a working web server. If you didn't complete that part of Lab 3: you'll need to do it first.
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| − | The format of the assignment is similar to a lab, but it's less specific about the exact steps you need to take. You're expected to show more independent learning abilities for an assignment than for a lab. The extra complicated parts are clarified for you here.
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| − | In short, a complete assignment will show that you can:
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| − | * Create AMIs from an existing VM and deploy new VMs based on that AMI.
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| − | * Use SSH keys, rsync, and cron to keep data on multiple servers synchronized.
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| − | * Use iptables as an Apache load balancer by directing traffic to a random slave.
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| − | This is the overview of your completed work in the form of a diagram:
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| − | [[File:AWSAsg1Overview.png|800px|border|center]] | |
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| − | = Part 1: first slave =
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| − | * Go to your www VM in the AWS Console and find the button to create an image from it.
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| − | ** Name the image www-for-asg1-p1
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| − | ** This will create an AMI with all the software configured the way you configured it.
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| − | * Deploy one new VM from the AMI you created above.
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| − | ** Name it www-slave1
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| − | ** With primary IP address 10.3.45.21
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| − | ** In ops345wwsg
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| − | ** Make sure the second virtual drive is named www-data-slave1
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| − | * Add the appropriate iptables rule on router and ops345routersg rule to allow yourself to SSH to www-data-slave1 via port 2221.
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| − | * Don't change the hostname of www-data-slave1, leave it as "www".
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| − | == Sync files with www ==
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| − | Each of your web servers (www and all the slaves) need to have the same data on them. That means you need to synchronize the contents of /var/www/html. You might recall this is mounted from a separate drive (/dev/xvdf) but that doesn't matter for this assignment.
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| − | You'll use rsync to do the synchronization, but first you need to set up your user on www-slave1 to be able to ssh to www without a password.
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| − | * Create an ssh key on www-slave1 as your regular user. Make sure the key is stored in /home/yourusername/.ssh/id_rsa_wwwsync
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| − | ** On www edit /home/yourusername/.ssh/authorized_keys
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| − | ** Paste the contents of /home/yourusername/.ssh/id_rsa_wwwsync.pub from www-slave1 to the end of that file as one line.
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| − | * Test your key authentication setup as yourusername on www-slave1 to confirm you can log in to yourusername@10.3.45.11 (www) without a password:<source>ssh -i /home/yourusername/.ssh/id_rsa_wwwsync yourusername@10.3.45.11</source>
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| − | Now set up rsync:
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| − | * Create a new file in /var/www/html on www and use this command on www-slave1 to make sure that new file is copied to www-slave1:<source>rsync -e "ssh -i ~/.ssh/id_rsa_wwwsync" -au --exclude="nextcloud" yourusername@10.3.45.11:/var/www/html/* /var/www/html</source>
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| − | * Create a new file in /var/www/html on www-slave1 and use this command on www-slave1 to make sure that new file is copied to www:<source>rsync -e "ssh -i ~/.ssh/id_rsa_wwwsync" -au --exclude="nextcloud" /var/www/html/* asmith15@10.3.45.11:/var/www/html</source>
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| − | * Once you confirm both rsync commands above work: make them run automatically every 5 minutes by editing your user's crontab on www-slave1:<source>*/5 * * * * rsync -e "ssh -i ~/.ssh/id_rsa_wwwsync" -au --exclude="nextcloud" asmith15@10.3.45.11:/var/www/html/* /var/www/html
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| − | */5 * * * * rsync -e "ssh -i ~/.ssh/id_rsa_wwwsync" -au --exclude="nextcloud" /var/www/html/* asmith15@10.3.45.11:/var/www/html</source>
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| − | * Test that by creating some files on www, some other files on www-slave1, and waiting more than 5 minutes.
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