Public bug reported:
A fresh install of Ubuntu 20.04. Installed MAAS regiond controller.
Here's Netplan config:
```
network:
ethernets:
enp4s0f0: {}
vlans:
vlan3:
id: 3
link: enp4s0f0
addresses: [10.3.9.24/16]
gateway4: 10.3.0.1
mtu: 9000
nameservers:
addresses: [10.3.0.1, 10.3.0.2]
version: 2
```
Here's permissions for files created in `/proc/net/vlan`
```
root@d9-33u-a:~# ls -lh /proc/net/vlan/
total 0
-rw------- 1 root root 0 May 25 04:33 config
-rw------- 1 root root 0 May 25 04:33 vlan3
```
This is causing issues with MAAS v3.0 beta:
```
2021-05-24 23:27:36 provisioningserver.rpc.clusterservice: [critical]
Event-loop 'd9-34u-b:pid=108335' handshake failed; dropping connection.
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line
1418, in _inlineCallbacks
result = g.send(result)
File
"/usr/lib/python3/dist-packages/provisioningserver/rpc/clusterservice.py", line
1176, in performHandshake
registered = yield self.registerRackWithRegion()
File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line
1613, in unwindGenerator
return _cancellableInlineCallbacks(gen)
File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line
1529, in _cancellableInlineCallbacks
_inlineCallbacks(None, g, status)
--- <exception caught here> ---
File
"/usr/lib/python3/dist-packages/provisioningserver/rpc/clusterservice.py", line
1176, in performHandshake
registered = yield self.registerRackWithRegion()
File "/usr/lib/python3/dist-packages/twisted/internet/defer.py", line
1418, in _inlineCallbacks
result = g.send(result)
File
"/usr/lib/python3/dist-packages/provisioningserver/rpc/clusterservice.py", line
1123, in registerRackWithRegion
interfaces = get_all_interfaces_definition()
File
"/usr/lib/python3/dist-packages/provisioningserver/utils/network.py", line
1133, in get_all_interfaces_definition
for name, ipaddr in get_ip_addr().items()
File
"/usr/lib/python3/dist-packages/provisioningserver/utils/ipaddr.py", line 43,
in get_ip_addr
output = call_and_check([get_resources_bin_path()])
File
"/usr/lib/python3/dist-packages/provisioningserver/utils/shell.py", line 106,
in call_and_check
raise ExternalProcessError(process.returncode, command,
output=stderr)
provisioningserver.utils.shell.ExternalProcessError: Command
`/usr/share/maas/machine-resources/amd64` returned non-zero exit status 1:
ERROR: open /proc/net/vlan/config: permission denied
```
I can modify the permissions manually, which fixes things; but a reboot
will set permissions back to 0600.
** Affects: maas (Ubuntu)
Importance: Undecided
Status: Confirmed
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https://bugs.launchpad.net/bugs/1929507
Title:
Files in /proc/net/vlan are being set to 0600 permissions
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