This bug is believed to be fixed in cloud-init in version 20.4. If this
is still a problem for you, please make a comment and set the state back
to New
Thank you.
** Changed in: cloud-init
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1897099
Title:
create_swap do not fallback to dd when fallocate fails
Status in cloud-init:
Fix Released
Bug description:
Name : cloud-init
Version : 20.2-1
Code in questioning: cloudinit/config/cc_mounts.py
try:
create_swap(fname, size, "fallocate")
except util.ProcessExecutionError as e:
LOG.warning(errmsg, fname, size, "dd", e)
LOG.warning("Will attempt with dd.")
create_swap(fname, size, "dd")
as there is a kernel bug in latest's linux versions, fallocate creates swap
images with holes.
The workaround is to move fallocate (make create_swap function to fail) so
that cloud-init will fallback to dd.
Used bootcmd (or cloud-boothook) to rename (move) fallocate binary from my
system but according the the logs, it didnt fallback to dd as it should.
Probably the error was not ProcessExecutionError
Logs:
/var/log/cloud-init-output.log:2020-09-24 09:13:16,470 -
cc_mounts.py[WARNING]: Failed to create swapfile '/swapfile' of size 2048MB via
fallocate: Unexpected
error while running command.
/var/log/cloud-init-output.log:Command: ['fallocate', '-l', '2048M',
'/swapfile']
/var/log/cloud-init-output.log:Reason: [Errno 2] No such file or directory:
b'fallocate'
/var/log/cloud-init-output.log:2020-09-24 09:13:16,479 -
cc_mounts.py[WARNING]: failed to setup swap: [Errno 2] No such file or
directory: '/swapfile'
/var/log/cloud-init-output.log:chmod: cannot access '/usr/bin/fallocate': No
such file or directory
/var/log/cloud-init.log:2020-09-24 09:13:16,460 - cc_mounts.py[DEBUG]:
Attempting to determine the real name of swap
/var/log/cloud-init.log:2020-09-24 09:13:16,460 - cc_mounts.py[DEBUG]:
changed default device swap => None
/var/log/cloud-init.log:2020-09-24 09:13:16,460 - cc_mounts.py[DEBUG]:
Ignoring nonexistent default named mount swap
/var/log/cloud-init.log:2020-09-24 09:13:16,461 - cc_mounts.py[DEBUG]:
suggest 2048.0 MB swap for 1983.953125 MB memory with '9030.296875 MB' disk
given max=2048.0 MB [max=2048.0 MB]'
/var/log/cloud-init.log:2020-09-24 09:13:16,461 - cc_mounts.py[DEBUG]:
Creating swapfile in '/swapfile' on fstype 'ext4' using 'fallocate'
/var/log/cloud-init.log:2020-09-24 09:13:16,461 - util.py[DEBUG]: Running
command ['fallocate', '-l', '2048M', '/swapfile'] with allowed return codes [0]
(she
ll=False, capture=True)
/var/log/cloud-init.log:2020-09-24 09:13:16,470 - cc_mounts.py[WARNING]:
Failed to create swapfile '/swapfile' of size 2048MB via fallocate: Unexpected
error while running command.
/var/log/cloud-init.log:Command: ['fallocate', '-l', '2048M', '/swapfile']
/var/log/cloud-init.log:Reason: [Errno 2] No such file or directory:
b'fallocate'
/var/log/cloud-init.log:2020-09-24 09:13:16,479 - util.py[DEBUG]: Attempting
to remove /swapfile
/var/log/cloud-init.log:2020-09-24 09:13:16,479 - util.py[DEBUG]: Setting up
swap file took 0.019 seconds
/var/log/cloud-init.log:2020-09-24 09:13:16,479 - cc_mounts.py[WARNING]:
failed to setup swap: [Errno 2] No such file or directory: '/swapfile'
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