Revision as of 12:35, 22 October 2013

Overview

The Provisioning-Backup-KVM Daemon is written in Perl and uses the mechanisms described under stoney core: OpenLDAP directory data organisation.

Workflow

This is the simplified workflow for the Provisioning-Backup-KVM Daemon. The Subroutines (snapshot, merge and retain) are shown later.

Figure 1: Simplified prov-backup-kvm workflow

You can modify/update this workflow by editing File:KVM-Backup-simple.xmi (you may need Umbrello UML Modeller diagram programme for KDE to display the content properly).

Snapshot

Figure 2: Detailed workflow for the snaphshot process

You can edit this workflow with the following file (you may need umbrello to modify it): File:KVM-Backup-Workflow-detailed.xmi

Merge

Figure 2: Detailed workflow for the merge process

You can edit this workflow with the following file (you may need umbrello to modify it): File:KVM-Backup-Workflow-detailed.xmi

Retain

Figure 3: Detailed workflow for the retain process

You can edit this workflow with the following file (you may need umbrello to modify it): File:KVM-Backup-Workflow-detailed.xmi

Configuration

Global

# Copyright (C) 2013 stepping stone GmbH
#                    Switzerland
#                    http://www.stepping-stone.ch
#                    support@stepping-stone.ch
#
# Authors:
#  Pat Kläy <pat.klaey@stepping-stone.ch>
#  
# Licensed under the EUPL, Version 1.1.
#
# You may not use this work except in compliance with the
# Licence.
# You may obtain a copy of the Licence at:
#
# http://www.osor.eu/eupl
#
# Unless required by applicable law or agreed to in
# writing, software distributed under the Licence is
# distributed on an "AS IS" basis,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
# express or implied.
# See the Licence for the specific language governing
# permissions and limitations under the Licence.
#



[Global]
# If true the script logs every information to the log-file.
LOG_DEBUG = 1

# If true the script logs additional information to the log-file.
LOG_INFO = 1

#If true the script logs warnings to the log-file.
LOG_WARNING = 1

#If true the script logs errors to the log-file.
LOG_ERR = 1

# The environment indicates the hostname (fqdn) on which the prov-backup-kvm 
# daemon is running
ENVIRONMENT = <STONEY-CLOUD-NODE-NAME>
 
# All information related to the database (backend) the daemon connects to
[Database]
BACKEND = LDAP
SERVER = <STONEY-CLOUD-LDAP-SERVER>
PORT = <STONEY-CLOUD-LDAP-PORT>
ADMIN_USER = <STONEY-CLOUD-LDAP-BINDDN>
ADMIN_PASSWORD = <STONEY-CLOUD-LDAP-BIND-PASSWORD>
SERVICE_SUBTREE = <STONEY-CLOUD-LDAP-SERVICE-SUBTREE>

# A cookie file will be used to be able to restart the daemon without
# processing every entry again (they appear as new if the daemon is started) 
COOKIE_FILE = <STONEY-CLOUD-LDAP-COOKIE-FILE>

# The default cookie just contains an empty CSN, in that way, all entries
# are processed
DEFAULT_COOKIE = rid=001,csn=

# The search filter for the database. Only process entries found with this
# filter
SEARCH_FILTER = (&(entryCSN>=%entryCSN%)(objectClass=*))

# Indicates the prov-backup-kvm configuration which applies for every
# VM-Pool and every VM if not overwritten by a VM-Pool- or VM-specific 
# configuration
STONEY_CLOUD_WIDE_CONFIGURATION = <STONEY-CLOUD-LDAP-PROV-BACKUP-KVM-DEFAULT-CONFIGURATION>

# Configuration concerining the provisioning module
[Service]

# The modus should always be selfcare
MODUS = selfcare

# Which TransportApi is used to execute the commands on the destination system
# TransportApi can be "LocalCLI" or "CLISSH"
TRANSPORTAPI = LocalCLI

# The name of the provisioning service
SERVICE = Backup

# The name of the provisioning type
TYPE = KVM

# The syslog tag (normally service-type)
SYSLOG = Backup-KVM

# All information concerning the gateway (TransportApi)
[Gateway]
HOST = localhost
USER = provisioning
DSA_FILE = none

# Service specific configuration which is not present in the backend
[Backup]

# Which command is used to export files
EXPORT_COMMAND = cp -p

Backend

Exit codes

The following list defines the return codes and their meaning for the KVM-Backup script see also KVMConstants.pm:

use constant SUCCESS_CODE                               => 0;

### Error codes constants
use constant UNDEFINED_ERROR                            => 1; # Always the first!
use constant MISSING_PARAMETER_IN_CONFIG_FILE           => 2;
use constant CONFIGURED_RAM_DISK_IS_NOT_VALUD           => 3;
use constant NOT_ENOUGH_SPACE_ON_RAM_DISK               => 4;
use constant CANNOT_SAVE_MACHINE_STATE                  => 5;
use constant CANNOT_WRITE_TO_BACKUP_LOCATION            => 6;
use constant CANNOT_COPY_FILE_TO_BACKUP_LOCATION        => 7;
use constant CANNOT_COPY_IMAGE_TO_BACKUP_LOCATION       => 8;
use constant CANNOT_COPY_XML_TO_BACKUP_LOCATION         => 9;
use constant CANNOT_COPY_BACKEND_FILE_TO_BACKUP_LOCATION=> 10;
use constant CANNOT_MERGE_DISK_IMAGES                   => 11;
use constant CANNOT_REMOVE_OLD_DISK_IMAGE               => 12;
use constant CANNOT_REMOVE_FILE                         => 13;
use constant CANNOT_CREATE_EMPTY_DISK_IMAGE             => 15;
use constant CANNOT_RENAME_DISK_IMAGE                   => 16;
use constant CANNOT_CONNECT_TO_BACKEND                  => 17;
use constant WRONG_STATE_INFORMATION                    => 18;
use constant CANNOT_SET_DISK_IMAGE_OWNERSHIP            => 19;
use constant CANNOT_SET_DISK_IMAGE_PERMISSION           => 20;
use constant CANNOT_RESTORE_MACHINE                     => 21;
use constant CANNOT_LOCK_MACHINE                        => 22;
use constant CANNOT_FIND_MACHINE                        => 23;
use constant CANNOT_COPY_STATE_FILE_TO_RETAIN           => 24;
use constant RETAIN_ROOT_DIRECTORY_DOES_NOT_EXIST       => 25;
use constant BACKUP_ROOT_DIRECTORY_DOES_NOT_EXIST       => 26;
use constant CANNOT_CREATE_DIRECTORY                    => 27;
use constant CANNOT_SAVE_XML                            => 28;
use constant CANNOT_SAVE_BACKEND_ENTRY                  => 29;
use constant CANNOT_SET_DIRECTORY_OWNERSHIP             => 30;
use constant CANNOT_SET_DIRECTORY_PERMISSION            => 31;
use constant CANNOT_FIND_CONFIGURATION_ENTRY            => 32;
use constant BACKEND_XML_UNCONSISTENCY                  => 33;
use constant CANNOT_CREATE_TARBALL                      => 34;
use constant UNSUPPORTED_FILE_TRANSFER_PROTOCOL         => 35;
use constant UNKNOWN_BACKEND_TYPE                       => 36;
use constant MISSING_NECESSARY_FILES                    => 37;
use constant CORRUPT_DISK_IMAGE_FOUND                   => 38;
use constant UNSUPPORTED_CONFIGURATION_PARAMETER        => 39;
use constant CANNOT_MOVE_DISK_IMAGE_TO_ORIGINAL_LOCATION=> 40;
use constant CANNOT_DEFINE_MACHINE                      => 41;
use constant CANNOT_START_MACHINE                       => 42;
use constant CANNOT_WORK_ON_UNDEFINED_OBJECT            => 43;
use constant CANNOT_READ_STATE_FILE                     => 44;
use constant CANNOT_READ_XML_FILE                       => 45;
use constant NOT_ALL_FILES_DELETED_FROM_RETAIN_LOCATION => 46;
use constant NOT_ENOUGH_DISK_SPACE                      => 47;
use constant NO_DISK_SPACE_INFORMATION                  => 48;

Next steps

• Change the behaviour of the snapshot/merge process
  • No longer merge the original file into the new one but merge (commit) backing store file back into original one
    • Like that we are able to reduce the backup (merge) time a lot.
    • Needs different behaviour for save -> copy/move -> create new image -> restore -> merge