chef on ubuntu 12.04

client.log

[2014-08-14T20:23:26+00:00] INFO: Daemonizing..
[2014-08-14T20:23:26+00:00] INFO: Forked, in 1507. Privileges: 0 0
[2014-08-14T20:23:37+00:00] INFO: SIGTERM received, exiting gracefully
[2014-08-14T20:23:37+00:00] FATAL: Chef is already running pid 1507
[2014-08-14T20:27:33+00:00] INFO: Forking chef instance to converge...
[2014-08-14T20:27:33+00:00] WARN:
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SSL validation of HTTPS requests is disabled. HTTPS connections are still
encrypted, but chef is not able to detect forged replies or man in the middle
attacks.

To fix this issue add an entry like this to your configuration file:

```
  # Verify all HTTPS connections (recommended)
  ssl_verify_mode :verify_peer

  # OR, Verify only connections to chef-server
  verify_api_cert true
```

To check your SSL configuration, or troubleshoot errors, you can use the
`knife ssl check` command like so:

```
  knife ssl check -c /etc/chef/client.rb
```

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[2014-08-14T20:27:33+00:00] INFO: *** Chef 11.12.0 ***
[2014-08-14T20:27:33+00:00] INFO: Chef-client pid: 1736
[2014-08-14T20:27:35+00:00] INFO: Client key /etc/chef/client.pem is not present - registering
[2014-08-14T20:27:35+00:00] WARN: Failed to read the private key /etc/chef/validation.pem: #<Errno::ENOENT: No such file or directory - /etc/chef/validation.pem>
[2014-08-14T20:27:35+00:00] FATAL: Stacktrace dumped to /var/chef/cache/chef-stacktrace.out
[2014-08-14T20:27:35+00:00] ERROR: I cannot read /etc/chef/validation.pem, which you told me to use to sign requests!
[2014-08-14T20:27:35+00:00] ERROR: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit code 1)
[2014-08-14T20:27:35+00:00] ERROR: Sleeping for 1800 seconds before trying again