[Bug 1420640] Re: upstart job fails to start with "limit nofile unlimited unlimited"

[Jose Gonzalez]

I figured out our problem. We lowered `fs.nr_open` on the non-working
systems from the - apparent default - of `1048576` to `655360`. The
docker package set a limit higher than our new limit, so the process was
failing to start.

Upstart is going away - boo - but in case anyone sees this issue in the
future, running the following was the fix for me:

```
sysctl -w fs.nr_open=1048576
```

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https://bugs.launchpad.net/bugs/1420640

Title:
  upstart job fails to start with "limit nofile unlimited unlimited"

Status in upstart :
  New
Status in upstart package in Ubuntu:
  Confirmed

Bug description:
  Upstart cookbook refers to "limit nofile unlimited unlimited".
  http://upstart.ubuntu.com/cookbook/#limit

  However it fails to start jobs, for example:

  $ sudo stop cron
  $ echo limit nofile unlimited unlimited | sudo tee /etc/init/cron.override
  $ sudo start cron
  start: Job failed to start

  Feb 11 16:02:52 lifebook kernel: [36027.452599] init: Failed to spawn
  cron main process: unable to set "nofile" resource limit: Operation
  not permitted

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: upstart 1.13.2-0ubuntu7
  ProcVersionSignature: Ubuntu 3.18.0-13.14-generic 3.18.5
  Uname: Linux 3.18.0-13-generic x86_64
  .etc.init.cron.override: limit nofile unlimited unlimited
  ApportVersion: 2.16.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Feb 11 16:03:27 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-02-09 (1 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150207)
  ProcKernelCmdline: BOOT_IMAGE=/vmlinuz-3.18.0-13-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: upstart
  UpgradeStatus: No upgrade log present (probably fresh install)
  UpstartBugCategory: System
  UpstartRunningSessionVersion: upstart 1.13.2
  UpstartRunningSystemVersion: init (upstart 1.13.2)
  modified.conffile..etc.at.deny: [inaccessible: [Errno 13] Permission denied: '/etc/at.deny']
  modified.conffile..etc.libvirt.qemu.conf: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/qemu.conf']
  modified.conffile..etc.libvirt.qemu.networks.default.xml: [inaccessible: [Errno 13] Permission denied: '/etc/libvirt/qemu/networks/default.xml']

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