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Last active December 18, 2015 11:59
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The strange case of ohai showing the wrong number of ephemeral disks
Raw
theory_vs_reality
ubuntu@ip-10-30-151-113:~$ ls -laF /dev | grep xvd
brw-rw---- 1 root disk 202, 1 Jun 14 02:55 xvda1
brw-rw---- 1 root disk 202, 16 Jun 14 02:55 xvdb
ubuntu@ip-10-30-151-113:~$ ohai | grep ephemeral
"block_device_mapping_ephemeral0": "sdb",
"block_device_mapping_ephemeral1": "sdc",
Raw
those_lying_so_and_sos
ubuntu@ip-10-30-151-113:~$ curl http://169.254.169.254/latest/meta-data/block-device-mapping/; echo
ami
ephemeral0
ephemeral1
root
ubuntu@ip-10-30-151-113:~$ curl http://169.254.169.254/latest/meta-data/block-device-mapping/ephemeral0 ; echo
sdb
ubuntu@ip-10-30-151-113:~$ curl http://169.254.169.254/latest/meta-data/block-device-mapping/ephemeral1 ; echo
sdc
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