Comments inline in /etc/waagent.conf cause config to not be read

[mabicca]

Hi Guys,

Recently helped with an issue where swap was not being created/activated properly after upgrading the waagent.

It looks like we had these lines in /etc/waagent.conf where you can notice the comments inline (bold):

Format if unformatted. If 'n', resource disk will not be mounted.

ResourceDisk.Format=y #added to enable swap

File system on the resource disk

Typically ext3 or ext4. FreeBSD images should use 'ufs2' here.

ResourceDisk.Filesystem=ext4

Mount point for the resource disk

ResourceDisk.MountPoint=/mnt

Create and use swapfile on resource disk.

ResourceDisk.EnableSwap=y #added to enable swap

Size of the swapfile.

ResourceDisk.SwapSizeMB=2048 #2gb swap size

With these comments, the swap creation was not being done; however after removing the comments, it works as expected.

It was probably some recent change in the waagent that is causing this since older releases do not have this problem.

This was tested in Ubuntu 16.04 LTS and running waagent 2.2.14

[brendandixon]

@mabicca The agent does not support end-of-line comments in its configuration file. Its parse code is quite simple (at present). We can better document this limitation.

[mabicca]

Hi Brendan,

I guess that was changed recently, with previous versions that was working just fine. Yes, if we can at least document that, it would be great.

Thank you!

[brendandixon]

@mabicca The agent has never accepted end-of-line comments. Odd that it "worked" previously.