[Bug 1904580] Re: Permissions 0644 for '/var/lib/nova/.ssh/id_rsa' are too open

[Paul Goins]

Just had a recurrence.  This happened when doing a series upgrade from
bionic/ussuri to focal/ussuri.  All compute nodes have
/var/lib/nova/.ssh/id_rsa with 0644 permissions.

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Title:
  Permissions 0644 for '/var/lib/nova/.ssh/id_rsa' are too open

Status in OpenStack nova-compute charm:
  New
Status in nova package in Ubuntu:
  New

Bug description:
  Charm revision: 320
  Cloud: bionic-ussuri

  Permissions 0644 for '/var/lib/nova/.ssh/id_rsa' are too open.
  Load key "/var/lib/nova/.ssh/id_rsa": bad permissions
  nova at 10.35.80.49: Permission denied (publickey).

  This was preventing nova resizing:

  /var/log/nova/nova-compute.log:2020-11-17 13:14:42.210 100221 ERROR
  oslo_messaging.rpc.server Command: ssh -o BatchMode=yes 10.35.80.49
  mkdir -p /var/lib/nova/instances/39caee98-b81c-4cef-9810-815f2ecf1fc4

  Manually setting to 0600 fixed the issue.

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