title: Running out of disk space in Amazon EC2, can't find what I am using my storage for
body: <p>I am Running an AWS ami using a T2.large instance using the US East. I was trying to upload some data and I ran in the terminal:</p>
  
  <pre><code>df -h
  </code></pre>
  
  <p>and I got this result:</p>
  
  <pre><code>Filesystem      Size  Used Avail Use% Mounted on
  udev            3.9G     0  3.9G   0% /dev
  tmpfs           799M  8.6M  790M   2% /run
  /dev/xvda1      9.7G  9.6G   32M 100% /
  tmpfs           3.9G     0  3.9G   0% /dev/shm
  tmpfs           5.0M     0  5.0M   0% /run/lock
  tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
  tmpfs           799M     0  799M   0% /run/user/1000
  </code></pre>
  
  <p>I know I have not uploaded 9.7 GB of data to the instance, but I don't know what <code>/dev/xvda1</code> is or how to access it.</p>
  
  <p>I also assume that all the <code>tmpfs</code> are temporal files, how can I erase those?</p>
  
  <p>Answering  some of the questions in the coments, I runned</p>
  
  <pre><code>sudo du -sh /*
  </code></pre>
  
  <p>And I got:</p>
  
  <pre><code>16M /bin
  124M    /boot
  0   /dev
  6.5M    /etc
  2.7G    /home
  0   /initrd.img
  0   /initrd.img.old
  4.0K    /jupyterhub_cookie_secret
  16K /jupyterhub.sqlite
  268M    /lib
  4.0K    /lib64
  16K /lost+found
  4.0K    /media
  4.0K    /mnt 
  562M    /opt
  du: cannot access '/proc/15616/task/15616/fd/4': No such file or directory
  du: cannot access '/proc/15616/task/15616/fdinfo/4': No such file or directory
  du: cannot access '/proc/15616/fd/4': No such file or directory
  du: cannot access '/proc/15616/fdinfo/4': No such file or directory
  0   /proc
  28K /root
  8.6M    /run
  14M /sbin
  8.0K    /snap 
  8.0K    /srv
  0   /sys
  64K /tmp
  4.7G    /usr
  1.5G    /var
  0   /vmlinuz
  0   /vmlinuz.old
  </code></pre>