Andreas Jaeger 2d44b2b36d Prepare for Sphinx 1.5

The new sphinx version introduces some changes that break build:

* Warns if code cannot be parsed for highlighting. Fix the code so
  that it can be parsed, this includes uncommenting "..." lines.
  Note that not every config file is an ini-file.
  Also, the parser seems to have bugs and cannot parse all files.
  Fix mysql ini file and enable the parameter, see
http://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html#sysvar_innodb_file_per_table
* :option: works only with declared options, replace useage with
  simple ``.

This change only handles a few files, more to come later.

Change-Id: I7c7335e514581622dd562ee355f62d6ae1beaa18

2017-01-11 20:37:55 +01:00

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Evacuate instances

If a hardware malfunction or other error causes a cloud compute node to fail, you can evacuate instances to make them available again. You can optionally include the target host on the nova evacuate command. If you omit the host, the scheduler chooses the target host.

To preserve user data on the server disk, configure shared storage on the target host. When you evacuate the instance, Compute detects whether shared storage is available on the target host. Also, you must validate that the current VM host is not operational. Otherwise, the evacuation fails.

To find a host for the evacuated instance, list all hosts:
```
$ openstack host list
```
Evacuate the instance. You can use the --password PWD option to pass the instance password to the command. If you do not specify a password, the command generates and prints one after it finishes successfully. The following command evacuates a server from a failed host to HOST_B.
```
$ nova evacuate EVACUATED_SERVER_NAME HOST_B
```
The command rebuilds the instance from the original image or volume and returns a password. The command preserves the original configuration, which includes the instance ID, name, uid, IP address, and so on.
```
+-----------+--------------+
| Property  |    Value     |
+-----------+--------------+
| adminPass | kRAJpErnT4xZ |
+-----------+--------------+
```
To preserve the user disk data on the evacuated server, deploy Compute with a shared file system. To configure your system, see section_configuring-compute-migrations. The following example does not change the password.
```
$ nova evacuate EVACUATED_SERVER_NAME HOST_B --on-shared-storage
```

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Evacuate instances

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