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Amazon EC2 Instance with EBS Block attached

Posted on 2016-09-28
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Last Modified: 2016-10-05
So I've setup an EC2 instance and took advice from here instead of expanding the root volume to add an additional EBS storage block.

I thought everything was working correctly until when copying some files I got an out of storage error.   So I ran df -h and I see that I have these volumes:
/dev/xvda1 it's almost full
/dev/xvde1 it's 500 gigs all empty

I'm updating files in the /var/www/html/ directory which I thought resided on the 500 gig hard drive not the small root one.  Is there an easy/quick method to move /var/www/html to the 500 gig drive and have site still work correctly?
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Question by:Nathan Riley
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Duncan Roe earned 2000 total points
ID: 41822765
I think you have to stop the site while you move stuff. Best is to take it down to single user. Create a top-level directory on your second drive and move www to be under it. Alternatively copy and verify new copy is good before deleting old one.

Now the important part: how to graft the moved directory back into the fie system. 2 alternatives
  1. Use a symbolic link
  2. Use a bind mount
Symbolic links can have undesirable side effects so cross off alternative 1.
A bind mount is practically invisible to applications software, so use that. Suppose you mounted /dev/xvde1 as /mnt/xvde1 and created directory /mnt/xvde1/var_copy to hold mnt/xvde1/var_copy/www. Leave /var/ww as an empty directory and put this line ion your /etc/fstab
/mnt/xvde1/var_copy/www  /var/www   none        bind             0   0

Open in new window

Enter mount -a to mount the moved directory then use telinit to put your system back to the default runlevel
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