Public bug reported:
I'm following the instructions to send cloud-config and repartition the
ephemeral disk in Azure: https://wiki.ubuntu.com/AzureSwapPartitions.
These instructions fail on Ubuntu 14.04 and 16.04 (did not test 12.04
yet).
Repro:
1) Add the following content to a file such as customdata.txt:
#cloud-config
disk_setup:
ephemeral0:
table_type: mbr
layout: [66, [33, 82]]
overwrite: True
fs_setup:
- device: ephemeral0.1
filesystem: ext4
- device: ephemeral0.2
filesystem: swap
mounts:
- ["ephemeral0.1", "/mnt2"]
- ["ephemeral0.2", "none", "swap", "sw", "0", "0"]
2) Create a VM in Azure with this cloud-config:
$ azure group create ubtest 'east us'
$ azure vm create ubtest ubtest-1604 Linux --image-urn
canonical:UbuntuServer:16.04.0-LTS:latest --admin-username azureuser
--admin-password '<PASSWORD>' --nic-name ubtest-1604 --location "East
US" --vnet-name "ubtest" --vnet-address-prefix "10.0.0.0/24" --vnet-
subnet-name "ubtest" --vnet-subnet-address-prefix "10.0.0.0/24"
--public-ip-name "ubtest" --public-ip-domain-name "ubtest" --custom-data
./customdata.txt
Expected Result:
- /dev/disk/cloud/azure_resource should have two partitions; one ext4 and a
second swap
- /dev/disk/cloud/azure_resource-part1 should be mounted on /mnt2
- /dev/disk/cloud/azure_resource-part2 should be active swap space
- /etc/fstab should be configured correctly
Actual Results:
- /dev/disk/cloud/azure_resource-part1 is properly mounted on /mnt2.
- On Ubuntu 14.04, /dev/disk/cloud/azure_resource is re-partitioned as
expected.
- On Ubuntu 16.04, /dev/disk/cloud/azure_resource is *not* re-partitioned.
There is only a single partition (no swap space).
- On Ubuntu 14.04 and 16.04, /etc/fstab includes an incorrect entry for the
swap space:
ephemeral0.2 none swap sw,comment=cloudconfig 0 0
This clearly won't work, it should resolve to "/dev/disk/cloud
/azure_resource-part2". I do notice that on Ubuntu 14.04, the ephemeral
disk is re-partitioned correctly, but there is no symlink in
/dev/disk/azure/ to the second partition. These symlinks are created by
/lib/udev/rules.d/66-azure-ephemeral.rules. Perhaps cloud-init needs to
re-trigger this udev rule after repartitioning the disk.
FYI, I also tested with the latest cloud-init that is currently in
xenial-proposed (0.7.8-47-gb6561a1-0ubuntu1~16.04.1) with the same results.
** Affects: cloud-init (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1642383
Title:
Unable to configure swap space on ephemeral disk in Azure
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