This patch adds three modes of disk replacement for drbd8:
  - replace the disk on the primary node
  - replace the disk on the secondary node
  - replace the secondary node

It also adds some debugging code to backend.py and increments the
protocol version for the recent changes of the rpc layer.

Reviewed-by: imsnah

This patch adds functionality to drbd8 for:
  - removing local storage
  - initializing without local storage
  - adding local storage

This is needed for the being able to replace disks for drbd8.

Reviewed-by: imsnah

This patch add code for renaming a device; more precisely, for changing
the unique_id of the device. This means:
  - logical volumes, rename the volume
  - drbd8, change the remote peer

This is needed for the being able to replace disks for drbd8.

Reviewed-by: imsnah

The predicate function gets build by a lambda function.
Also add a bit of debugging information to the 'unknown OS diagnose type'.


Reviewed-by: iustinp

The two function 'any' and 'all' are copied as-is from the python 2.4
documentation for the itertools module. They are useful (and are already
builtin function in python 2.5).

Reviewed-by: iustinp

This is done in order to easy debugging of disk-related issues.

Reviewed-by: imsnah

The two calls mirror_addchild and mirror_removechild take only one child
for addition/removal. While this is enough for our md usage, for local
disk replacement in drbd8, we need to be able to specify both the data
and metadata device. This patch modifies these two rpc calls (and their
backend implementation and their usage in cmdlib) to take a list of
children to add/remove.

Reviewed-by: imsnah

This is a partially working drbd8 template type. It does:
  - add/remove
  - startup/failover/shutdown

Not working is replace disks, which needs custom code for this template.

Reviewed-by: imsnah

Currently the way we shutdown or startup disks seems to make DRBD8
unhappy. Until we rewrite the sequence of (de)activation, allow DRBD to
connect after a sb1-pri condition with no changes to the data.

Reviewed-by: imsnah

This leaves an instance's disks configured for the primary node as after
disk activation we want to start the instance anyway. As such,
_GatherBlockDevs in backend.py will need the disks configured for the
primary.

Reviewed-by: imsnah

This duplicates some code from the DRBDev class, but not very much, and
it will be expanded with the new functionality available for the 8.x
version. Currently the code is not accessible outside the module.

This patch introduces a dependency on the pyparsing module.

Reviewed-by: imsnah

The DRBDev._IsValidMeta only checks for the metadata device size. Since
this is a useful check (but not complete) for DRBD8, move it to the base
class and name it _CheckMetaSize.

Reviewed-by: imsnah

This moves the _SetFromMinor and _MassageProcData to the base class.

Reviewed-by: imsnah

Currently, the out-of-minors handling is not very good: though both MD
and DRBD functions for finding an unused minor can return None, only the
DRBD code checks for this case.

This patch improves this by making the functions _FindUnusedMinor raise
an error instead of None, and gets rid of the one manual check for the
return value.

Reviewed-by: imsnah

Since some of the methods and constants are valid for both 0.7 and 8.x
versions, we move them to the base class.

Reviewed-by: imsnah

Reviewed-by: imsnah

This is a small split of some functionality from the DRBDev class into a
base drbd class that holds just a few things, in order to make migration
to drbd 8.x easier.

Reviewed-by: imsnah

Currently, the disk types are defined using constants in the code.
Convert those into constants so that we can easily find them and check
their usage.

Note that we don't rename the values of the constants as they are used
in the configuration file, and as such it's best to leave them as they
are.

Reviewed-by: imsnah

Testing failure on the primary node is currently disabled due to drbd problems.

Reviewed-by: iustinp

This patch series implements the reboot command for gnt-instance. It
supports three types of reboot: soft (hypervisor reboot), hard (instance
config rebuild and reboot) and full (full instance shutdown and startup
again).

This patch contains the gnt-instance script and the man page for it.

Reviewed-by: iustinp

This patch series implements the reboot command for gnt-instance. It
supports three types of reboot: soft (hypervisor reboot), hard (instance
config rebuild and reboot) and full (full instance shutdown and startup
again).

This patch contains the opcode and lu part.

Reviewed-by: iustinp

This patch series implements the reboot command for gnt-instance. It
supports three types of reboot: soft (hypervisor reboot), hard (instance
config rebuild and reboot) and full (full instance shutdown and startup
again).

This patch contains the backend and rpc part of the patch.


Reviewed-by: iustinp

Reviewed-by: imsnah

Reviewed-by: schreiberal

Reviewed-by: imsnah

Reviewed-by: imsnah

This patch adds a new option to the instance removal command
"--ignore-failures" that forces the removal of the instance from the
configuration even if the removal process encounters errors.

In order to be able to do this when the remote node(s) is(are) down, we
need to restrict the execution of the instance removal hook to the
master only. I think this is a reasonable trade-off (but I'm not sure).

Reviewed-by: imsnah

The node's ssh keys filenames are now provided as constants; this should
allow easier customization.

Also, the user's ssh key computing has been abstracted into ssh.py

Reviewed-by: imsnah

Reviewed-by: iustinp

The creation of the log file for the node daemon lacks the mode
parameter, so after applying the current umask, the file got 0700
permissions. Restrict this to the correct 0600.

Reviewed-by: schreiberal

Reviewed-by: iustinp

Reviewed-by: iustinp

Reviewed-by: iustinp

Reviewed-by: iustinp

This patch does the following:
  - add constants.GANETI_RUNAS = "root", which is used to compute
    the homedir (and thus the .ssh directory) instead of hardcoding
    "/root/.ssh" in backend.AddNode and backend.LeaveCluster
  - add constants.SSH_CONFIG_DIR (currently hardcoded to /etc/ssh) that
    is used in backend instead of hardcoding it (preparation for
    selecting that at ./configure time)
  - some more internal cleanup in backend.AddNode

Reviewed-by: imsnah

Reviewed-by: schreiberal

Currently there are a few version of "write a file safely" in the code.
This patch adds a generic function that should be able to replace all
the other versions.

The "take attributes from the target file" option, while useful, is not
implemented by this patch.

Reviewed-by: imsnah,ultrotter

Since we remove only files from DATA_DIR and not from subdirectories,
let's not walk the entire tree, a simple listdir suffices. Also switch
to utils.RemoveFile from simple os.unlink.

Reviewed-by: imsnah

Currently GetHomeDir accepts UIDs only. Enhance it to accept either a
user name or a user id, to allow for nicer usage.

Reviewed-by: imsnah

Put some order in gnt-os putting helper functions above and command functions
below. Also add a new _DiagnoseOSName() function and use it to make _GetAllOS
simplier to understand. Change its name to _DiagnoseByOS which makes more clear
what it does.



Reviewed-by: iustinp