[Bug 1305418] Re: walinuxagent breaks sshd configuration

[Ben Howard]

** Summary changed:

- Broken SSHD configuration on Ubuntu 13.10 with latest walinuxagent update
+ walinuxagent breaks sshd configuration

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Title:
  walinuxagent breaks sshd configuration

Status in “walinuxagent” package in Ubuntu:
  In Progress

Bug description:
  After installing the latest walinuxagent package on Ubuntu 13.10 I see
  that we end up with a broken configuration in /etc/ssh/sshd_config.
  The last line in that file looks like the following:

     UsePAM yesClientAliveInterval 180

  This is the result of the agent package re-running "waagent -setup,"
  which wants to append the "ClientAliveInterval 180" parameter to
  /etc/ssh/sshd_config to avoid timeouts with the Azure load balancer
  (which has a 4 minute timeout).  But currently waagent assumes there
  is a "\n" at the end of this file.

  We could fix this bug in the agent to always add "\n" to the front of
  this parameter (maybe a good idea) or there may be another way to fix
  this.

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