How to list s3fs mounts

The AWS CLI now supports the --query parameter which takes a JMESPath expressions.

This means you can sum the size values given by list-objects using sum(Contents[].Size) and count like length(Contents[]).

This can be be run using the official AWS CLI as below and was introduced in Feb 2014

 aws s3api list-objects --bucket BUCKETNAME --output json --query "[sum(Contents[].Size), length(Contents[])]"

Follow the Ubuntu RcLocalHowto to create /etc/init.d/local, and then put your command in that file. The mount will then happen automatically on boot.

To test, invoke /etc/init.d/local manually on the command line (as root). You should see that causes the mount to occur.

EDIT: doing the mount from /etc/fstab should work fine too, according to the s3fs faq:

s3fs#example.com /mnt/s3/blah fuse _netdev,use_cache=/tmp,use_rrs=1,allow_other 0 0

Reason to prefer the /etc/init.d/local approach: it's simpler to set up, just put your existing mount script in that file.

Reason to prefer the fstab approach: it's a more standard way to do mounts, and someone who doesn't know about your setup can just look in /etc/fstab to determine what mounts your machine is making.