OpenStack Swift incremental backup and restore automation tool for file system, MongoDB, MySQL. LVM snapshot and encryption support.
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Freezer is a Backup Restore DR as a Service platform that helps you to automate the data backup and restore process.

The following features are available:

  • Backup your filesystem using point in time snapshot
  • Strong encryption supported: AES-256-CFB
  • Backup your file system tree directly (without volume snapshot)
  • Backup your journaled MongoDB directory tree using lvm snap to swift
  • Backup MySQL DB with lvm snapshot
  • Restore your data from a specific date automatically to your file system
  • Low storage consumption as the backup are uploaded as a stream
  • Flexible backup policy (incremental and differential)
  • Data is archived in GNU Tar format for file based incremental
  • Multiple compression algorithm support (zlib, bzip2, xz)
  • Remove old backup automatically according the provided parameters
  • Multiple storage media support (Swift, local file system, ssh)
  • Flush kernel buffered memory to disk
  • Multi platform (Linux, Windows, *BSD, OSX)
  • Manage multiple jobs (i.e. multiple backups on the same node)
  • Synchronize backups and restore on multiple nodes
  • Web user interface integrated with OpenStack Horizon
  • Can execute scripts/commands before or after a job execution


  • OpenStack Swift Account (optional)
  • python
  • GNU Tar >= 1.26
  • gzip, bzip2, xz
  • OpenSSL
  • python-swiftclient
  • python-keystoneclient
  • pymongo
  • PyMySQL
  • libmysqlclient-dev
  • sync
  • At least 128 MB of memory reserved for Freezer

Installation & Env Setup

Install required packages

Ubuntu / Debian

Swift client and Keystone client:

$ sudo apt-get install -y python-dev
$ sudo easy_install -U pip

MongoDB backup:

$ sudo apt-get install -y python-pymongo

MySQL backup:

$ sudo pip install pymysql

Freezer installation from Python package repo:

$ sudo pip install freezer


$ sudo easy_install freezer

The basic Swift account configuration is needed to use freezer. Make sure python-swiftclient is installed.

Also the following ENV var are needed you can put them in ~/.bashrc:

export OS_REGION_NAME=region-a.geo-1
export OS_TENANT_ID=<account tenant>
export OS_PASSWORD=<account password>
export OS_AUTH_URL=
export OS_USERNAME=automationbackup
export OS_TENANT_NAME=automationbackup

$ source ~/.bashrc

Let's say you have a container called freezer_foobar-container, by executing "swift list" you should see something like:

$ swift list

These are just use case example using Swift in the HP Cloud.

Is strongly advised to use execute a backup using LVM snapshot, so freezer will execute a backup on point-in-time data. This avoid risks of data inconsistencies and corruption.


Install OpenSSL binaries from and add it to Path:

Install sync binaries from and add it to Path

General packages:

> easy_install -U pip
> pip install freezer

The basic Swift account configuration is needed to use freezer. Make sure python-swiftclient is installed:

set OS_REGION_NAME=region-a.geo-1
set OS_TENANT_ID=<account tenant>
set OS_PASSWORD=<account password>
set OS_USERNAME=automationbackup
set OS_TENANT_NAME=automationbackup

Usage Example

Freezer will automatically add the prefix "freezer" to the container name, where it is provided by the user and doesn't already start with this prefix. If no container name is provided, the default is freezer_backups.

The execution arguments can be set from command line and/or config file in ini format. there's an example of the job config file available in freezer/freezer/specs/job-backup.conf.example. Command line options always override the same options in the config file.


The most simple backup execution is a direct file system backup:

$ sudo freezerc --file-to-backup /data/dir/to/backup
--container freezer_new-data-backup --backup-name my-backup-name

* On windows (need admin rights)*
> freezerc --action backup --mode fs --backup-name testwindows
--path-to-backup "C:\path\to\backup" --container freezer_windows
--log-file  C:\path\to\log\freezer.log

By default --mode fs is set. The command would generate a compressed tar gzip file of the directory /data/dir/to/backup. The generated file will be segmented in stream and uploaded in the swift container called freezer_new-data-backup, with backup name my-backup-name

Now check if your backup is executing correctly looking at /var/log/freezer.log

Execute a MongoDB backup using lvm snapshot:

We need to check before on which volume group and logical volume our mongo data is. These information can be obtained as per following:

$ mount

Once we know the volume where our Mongo data is mounted on, we can get the volume group and logical volume info:

$ sudo vgdisplay
$ sudo lvdisplay

We assume our mongo volume is "/dev/mongo/mongolv" and the volume group is "mongo":

$ sudo freezerc --lvm-srcvol /dev/mongo/mongolv --lvm-dirmount /var/lib/snapshot-backup
--lvm-volgroup mongo --file-to-backup /var/lib/snapshot-backup/mongod_ops2
--container freezer_mongodb-backup-prod --exclude "*.lock" --mode mongo --backup-name mongod-ops2

Now freezerc create a lvm snapshot of the volume /dev/mongo/mongolv. If no options are provided, default snapshot name is freezer_backup_snap. The snap vol will be mounted automatically on /var/lib/snapshot-backup and the backup meta and segments will be upload in the container mongodb-backup-prod with the name mongod-ops2.

Execute a file system backup using lvm snapshot:

$ sudo freezerc --lvm-srcvol /dev/jenkins/jenkins-home --lvm-dirmount
/var/snapshot-backup --lvm-volgroup jenkins
--file-to-backup /var/snapshot-backup --container freezer_jenkins-backup-prod
--exclude "\*.lock" --mode fs --backup-name jenkins-ops2

MySQL backup require a basic configuration file. The following is an example of the config:

$ sudo cat /root/.freezer/db.conf
host =
user = backup
password = userpassword

Every listed option is mandatory. There's no need to stop the mysql service before the backup execution.

Execute a MySQL backup using lvm snapshot:

$ sudo freezerc --lvm-srcvol /dev/mysqlvg/mysqlvol
--lvm-dirmount /var/snapshot-backup
--lvm-volgroup mysqlvg --file-to-backup /var/snapshot-backup
--mysql-conf /root/.freezer/freezer-mysql.conf--container
freezer_mysql-backup-prod --mode mysql --backup-name mysql-ops002

Cinder backups

To make a cinder backup you should provide cinder-vol-id or cindernative-vol-id parameter in command line arguments. Freezer doesn't do any additional checks and assumes that making backup of that image will be sufficient to restore your data in future.

Execute a cinder backup::

$ freezerc --cinder-vol-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b

Execute a mysql backup with cinder:

$ freezerc --mysql-conf /root/.freezer/freezer-mysql.conf
--container freezer_mysql-backup-prod --mode mysql
--backup-name mysql-ops002
--cinder-vol-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b

Nova backups

To make a nova backup you should provide nova parameter in arguments. Freezer doesn't do any additional checks and assumes that making backup of that instance will be sufficient to restore your data in future.

Execute a nova backup::

$ freezerc --nova-inst-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b

Execute a mysql backup with nova:

$ freezerc --mysql-conf /root/.freezer/freezer-mysql.conf
--container freezer_mysql-backup-prod --mode mysql
--backup-name mysql-ops002
--nova-inst-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b

All the freezerc activities are logged into /var/log/freezer.log.

Swift, Local and SSH Storages

Freezer can use:

local storage - folder that is available in the same os (may be mounted)

To use local storage specify "--storage local" And use "--container %path-to-folder-with-backups%" Backup example:

$ sudo freezerc --file-to-backup /data/dir/to/backup
--container /tmp/my_backup_path/ --backup-name my-backup-name
--storage local

Restore example:

$ sudo freezerc --action restore --restore-abs-path /data/dir/to/backup
--container /tmp/my_backup_path/ --backup-name my-backup-name
--storage local

swift storage - OS object storage

To use local storage specify "--storage swift" or skip "--storage" parameter at all. And use "--container %swift-container-name%"

Backup example:

$ sudo freezerc --file-to-backup /data/dir/to/backup
--container freezer-container --backup-name my-backup-name
--storage swift

Restore example:

$ sudo freezerc --action restore --restore-abs-path /data/dir/to/backup
--container freezer-container --backup-name my-backup-name
--storage swift

ssh storage - folder on remote machine

To use ssh storage specify "--storage ssh" And use "--container %path-to-folder-with-backups-on-remote-machine%" Also you should specify ssh-username, ssh-key and ssh-host parameters. ssh-port is optional parameter, default is 22

ssh-username for user ubuntu should be "--ssh-username ubuntu" ssh-key should be path to your secret ssh key "--ssh-key %path-to-secret-key%" ssh-host can be ip of remote machine or resolvable dns name "--ssh-host"

Backup example:

$ sudo freezerc --file-to-backup /data/dir/to/backup
--container /remote-machine-path/ --backup-name my-backup-name
--storage ssh --ssh-username ubuntu --ssh-key ~/.ssh/id_rsa

Restore example:

$ sudo freezerc  --action restore --restore-abs-pat /data/dir/to/backup
--container /remote-machine-path/ --backup-name my-backup-name
--storage ssh --ssh-username ubuntu --ssh-key ~/.ssh/id_rsa


As a general rule, when you execute a restore, the application that write or read data should be stopped.

There are 3 main options that need to be set for data restore

File System Restore:

Execute a file system restore of the backup name adminui.git:

$ sudo freezerc --action restore --container freezer_foobar-container-2
--backup-name adminui.git
--restore-from-host git-HP-DL380-host-001 --restore-abs-path
--restore-from-date "2014-05-23T23:23:23"

MySQL restore:

Execute a MySQL restore of the backup name holly-mysql. Let's stop mysql service first:

$ sudo service mysql stop

Execute Restore:

$ sudo freezerc --action restore --container freezer_foobar-container-2
--backup-name mysq-prod --restore-from-host db-HP-DL380-host-001
--restore-abs-path /var/lib/mysql --restore-from-date "2014-05-23T23:23:23"

And finally restart mysql:

$ sudo service mysql start

Execute a MongoDB restore of the backup name mongobigdata:

$ sudo freezerc --action restore --container freezer_foobar-container-2
--backup-name mongobigdata --restore-from-host db-HP-DL380-host-001
--restore-abs-path /var/lib/mongo --restore-from-date "2014-05-23T23:23:23"

List remote containers:

$ sudo freezerc --action info  -L

List remote objects in container:

$ sudo freezerc --action info --container freezer_testcontainer -l

Remove backups older then 1 day:

$ freezerc --action admin --container freezer_dev-test --remove-older-then 1 --backup-name dev-test-01

Cinder restore currently creates a volume with content of saved one, but doesn't implement deattach of existing volume and attach the new one to the vm. You should implement this steps manually. To create new volume from existing content run next command:

Execute a cinder restore:

$ freezerc --action restore --cinder-inst-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b
$ freezerc --action restore --cindernative-vol-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b

Nova restore currently creates an instance with content of saved one, but the ip address of vm will be different as well as it's id.

Execute a nova restore:

$ freezerc --action restore --nova-inst-id 3ad7a62f-217a-48cd-a861-43ec0a04a78b

Local storage restore execution:

$ sudo freezerc --action restore --container /local_backup_storage/ --backup-name adminui.git --restore-from-host git-HP-DL380-host-001 --restore-abs-path /home/git/repositories/adminui.git/ --restore-from-date "2014-05-23T23:23:23" --storage local


Freezer architectural components are the following:

  • OpenStack Swift (the storage)
  • freezer client running on the node you want to execute the backups or restore

Freezer use GNU Tar under the hood to execute incremental backup and restore. When a key is provided, it uses OpenSSL to encrypt data (AES-256-CFB) ============= Freezer architecture is composed by the following components:

Component Description
Freezer Web UI Web interface that interact with the Freezer API to configure, change settings. It provides most of the feature from the freezerc CLI, advanced scheduler settings as multi-node backup synchronization, metrics and reporting.
Freezer Scheduler A client side component, running on the node where the data backup has to be executed. It consist of a daemon that retrieve the data from the freezer API and execute jobs (i.e. backups, restore, admin actions, info actions, pre and/or post job scripts) by running the Freezer Agent. The metrics and exit codes returned by the freezer agent are captured and sent to the Freezer API. The scheduler manage the execution and synchronization of multiple jobs executed on a single or multiple nodes. The status of the execution of all the nodes is saved through the API. The Freezer scheduler take care of uploading jobs to the API by reading job files on the file system. It also have its own configuration file where job session or other settings like the freezer API polling interval can be configured. The Freezer scheduler manage jobs, for more information about jobs please refer to: freezer_api/README.rst under JOB the sections
Freezer Agent

Multiprocessing Python software that runs at client side, where the data backup has to be executed. It can be executed standalone or by the Freezer Scheduler. The freezerc provide flexible way to execute backup, restore and other actions on a running system. In order to provide flexibility in terms of data integrity, speed, performance, resources usage etc the freezer agent offer a wide range of options to execute optimized backup according the available resources as:

  • Segments size (the amount of memory used)
  • Queues size (optimize backups where I/O, bandwidth, memory or CPU is a constraints)
  • I/O Affinity and process priority (it can be used with real time I/O and maximum user level process priority)
  • Bandwidth limitation
  • Client side Encryption (AES-256-CFB)
  • Compression (multiple algorithms supported as zlib, bzip2, xz/lzma)
  • Parallel upload to pluggable storage media (i.e. upload backup to swift and to a remote node by ssh, or upload to two or more independent swift instances with different credentials, etc)
  • Execute file based incremental (like tar), block based incremental (like rsync algorithm) and differential based backup and restore
  • Multiplatform as it can be run on Linux, Windows, *BSD and OSX
  • Automatic removal of old backups
Freezer API API are used to store and provide metadata to the Freezer Web UI and to the Freezer Scheduler. Also the API are used to store session information for multi node backup synchronization. No workload data is stored in the API. For more information to the API please refer to: freezer_api/README.rst
DB Elasticsearch Backend used by the API to store and retrieve metrics, metadata sessions information job status, etc.

Freezer currently use GNU Tar under the hood to execute incremental backup and restore. When a key is provided, it uses OpenSSL to encrypt data (AES-256-CFB)

The following diagrams can help to better understand the solution:

Service Architecture


Freezer Agent backup work flow with API


Freezer Agent backup without API


Freezer Scheduler with API


Freezer Job Session


Freezer Dashboard


How to scale


Low resources requirement

Freezer is designed to reduce at the minimum I/O, CPU and Memory Usage. This is achieved by generating a data stream from tar (for archiving) and gzip (for compressing). Freezer segment the stream in a configurable chunk size (with the option --max-seg-size). The default segment size is 64MB, so it can be safely stored in memory, encrypted if the key is provided, and uploaded to Swift as segment.

Multiple segments are sequentially uploaded using the Swift Manifest. All the segments are uploaded first, and then the Manifest file is uploaded too, so the data segments cannot be accessed directly. This ensue data consistency.

By keeping small segments in memory, I/O usage is reduced. Also as there's no need to store locally the final compressed archive (tar-gziped), no additional or dedicated storage is required for the backup execution. The only additional storage needed is the LVM snapshot size (set by default at 5GB). The lvm snapshot size can be set with the option --lvm-snapsize. It is important to not specify a too small snap size, because in case a quantity of data is being wrote to the source volume and consequently the lvm snapshot is filled up, then the data is corrupted.

If the more memory is available for the backup process, the maximum segment size can be increased, this will speed up the process. Please note, the segments must be smaller then 5GB, is that is the maximum object size in the Swift server.

Au contraire, if a server have small memory availability, the --max-seg-size option can be set to lower values. The unit of this option is in bytes.

How the incremental works

The incremental backups is one of the most crucial feature. The following basic logic happens when Freezer execute:

  1. Freezer start the execution and check if the provided backup name for the current node already exist in Swift
  2. If the backup exists, the Manifest file is retrieved. This is important as the Manifest file contains the information of the previous Freezer execution.

Nova and Cinder Backups

If our data is stored on cinder volume or nova instance disk, we can implement file backup using nova snapshots or volume backups.

Nova backups:

If you provide nova argument in parameters freezer assume that all necessary data is located on instance disk and it can be successfully stored using nova snapshot mechanism.

For example if we want to store our mysql located on instance disk, we will execute the same actions like in case of lvm or tar snapshots, but we will invoke nova snapshot instead of lvm or tar.

After that we will place snapshot to swift container as dynamic large object.

container/%instance_id%/%timestamp% <- large object with metadata container_segments/%instance_id%/%timestamp%/segments...

Restore will create a snapshot from stored data and restore an instance from this snapshot. Instance will have different id and old instance should be terminated manually.

Cinder backups:

Cinder has it's own mechanism for backups and freezer supports it. But it also allows create a glance image from volume and upload to swift.

To use standard cinder backups please provide --cindernative-vol-id argument.


The freezer-scheduler is one of the two freezer components which is run on the client nodes, the other one being the freezer-agent. It has a double role: it is used both to start the scheduler process, and as a cli-tool which allows the user to interact with the api.

The freezer-scheduler process can be started/stopped in daemon mode using the usual positional arguments :

freezer-scheduler start|stop

It can be also be started as a foreground process using the --no-daemon flag: :

freezer-scheduler --no-daemon start

This can be useful for testing purposes or when launched in a Docker container or by a babysitting process such as systemd.

The cli-tool version is used to manage the jobs in the api. A "job" is basically a container, a document which contains one or more "actions". An action contains the instructions for the freezer-agent. They are the same parameter that would be passed to the agent on the command line, for example: "backup_name", "path_to_backup", "max_level"

To sum it up, a job is a sequence of parameters that the scheduler pulls from the api and passes to a newly spawned freezer-agent process at the right time.

The scheduler understands the "scheduling" part of the job document, which it uses to actually schedule the job, while the rest of the parameters are substantially opaque.

It may also be useful to use the "-c" parameter to specify the client-id that the scheduler will use when interacting with the api.

The purpose of the client-id is that of associate a job with the scheduler instance which is supposed to execute that job.

A single openstack user could manage different resources on different nodes (and actually may even have different freezer-scheduler instances running on the same node with different local privileges, for example), and the client-id allows him to associate the specific scheduler instance with its specific jobs.

When not provided with a custom client-id, the scheduler falls to the default which is composed from the tenant-is and the hostname of the machine it is running on.

The first step to use the scheduler is creating a document with the job: :

cat test_job.json

  "job_actions": [
          "freezer_action": {
              "action": "backup",
              "mode": "fs",
              "backup_name": "backup1",
              "path_to_backup": "/home/me/datadir",
              "container": "schedule_backups",
              "log_file": "/home/me/.freezer/freezer.log"
          "max_retries": 3,
          "max_retries_interval": 60
  "job_schedule": {
      "schedule_interval": "4 hours",
      "schedule_start_date": "2015-08-16T17:58:00"
  "description": "my scheduled backup 6"

Then upload that job into the api: :

freezer-scheduler -c node12 job-create --file test_job.json

The newly created job can be found with: :

freezer-scheduler -c node12 job-list

|              job_id              |    description     | # actions | status | event | result | session_id |
| 07999ea33a494ccf84590191d6fe850c | schedule_backups 6 |     1     |        |       |        |            |

Its content can be read with: :

freezer-scheduler -c node12 job-get -j 07999ea33a494ccf84590191d6fe850c

The scheduler can be started on the target node with: :

freezer-scheduler -c node12 -i 15 -f ~/job_dir start

The scheduler could have already been started. As soon as the freezer-scheduler contacts the api, it fetches the job and schedules it.


Please check the FAQ to: FAQ.rst

Available options:

$ freezerc

      usage: freezerc [-h] [--config CONFIG] [--action {backup,restore,info,admin}]
                [-F PATH_TO_BACKUP] [-N BACKUP_NAME] [-m MODE] [-C CONTAINER]
                [-L] [-l] [-o GET_OBJECT] [-d DST_FILE]
                [--lvm-auto-snap LVM_AUTO_SNAP] [--lvm-srcvol LVM_SRCVOL]
                [--lvm-snapname LVM_SNAPNAME] [--lvm-snapsize LVM_SNAPSIZE]
                [--lvm-dirmount LVM_DIRMOUNT] [--lvm-volgroup LVM_VOLGROUP]
                [--max-level MAX_LEVEL] [--always-level ALWAYS_LEVEL]
                [--restart-always-level RESTART_ALWAYS_LEVEL]
                [-R REMOVE_OLDER_THAN] [--remove-from-date REMOVE_FROM_DATE]
                [--no-incremental] [--hostname HOSTNAME]
                [--mysql-conf MYSQL_CONF] [--log-file LOG_FILE]
                [--exclude EXCLUDE]
                [--dereference-symlink {none,soft,hard,all}] [-U]
                [--encrypt-pass-file ENCRYPT_PASS_FILE] [-M MAX_SEGMENT_SIZE]
                [--restore-abs-path RESTORE_ABS_PATH]
                [--restore-from-host RESTORE_FROM_HOST]
                [--restore-from-date RESTORE_FROM_DATE] [--max-priority] [-V]
                [-q] [--insecure] [--os-auth-ver {1,2,3}] [--proxy PROXY]
                [--dry-run] [--upload-limit UPLOAD_LIMIT]
                [--cinder-vol-id CINDER_VOL_ID] [--nova-inst-id NOVA_INST_ID]
                [--cindernative-vol-id CINDERNATIVE_VOL_ID]
                [--download-limit DOWNLOAD_LIMIT]
                [--sql-server-conf SQL_SERVER_CONF] [--vssadmin VSSADMIN]

optional arguments:
  -h, --help            show this help message and exit
  --config CONFIG       Config file abs path. Option arguments are provided
                        from config file. When config file is used any option
                        from command line provided take precedence.
  --action {backup,restore,info,admin}
                        Set the action to be taken. backup and restore are
                        self explanatory, info is used to retrieve info from
                        the storage media, while admin is used to delete old
                        backups and other admin actions. Default backup.
  -F PATH_TO_BACKUP, --path-to-backup PATH_TO_BACKUP, --file-to-backup PATH_TO_BACKUP
                        The file or directory you want to back up to Swift
  -N BACKUP_NAME, --backup-name BACKUP_NAME
                        The backup name you want to use to identify your
                        backup on Swift
  -m MODE, --mode MODE  Set the technology to back from. Options are, fs
                        (filesystem), mongo (MongoDB), mysql (MySQL),
                        sqlserver (SQL Server) Default set to fs
                        The Swift container used to upload files to
  -L, --list-containers
                        List the Swift containers on remote Object Storage
  -l, --list-objects    List the Swift objects stored in a container on remote
                        Object Storage Server.
  -o GET_OBJECT, --get-object GET_OBJECT
                        The Object name you want to download on the local file
  -d DST_FILE, --dst-file DST_FILE
                        The file name used to save the object on your local
                        disk and upload file in swift
  --lvm-auto-snap LVM_AUTO_SNAP
                        Automatically guess the volume group and volume name
                        for given PATH.
  --lvm-srcvol LVM_SRCVOL
                        Set the lvm volume you want to take a snaphost from.
                        Default no volume
  --lvm-snapname LVM_SNAPNAME
                        Set the lvm snapshot name to use. If the snapshot name
                        already exists, the old one will be used a no new one
                        will be created. Default freezer_backup_snap.
  --lvm-snapsize LVM_SNAPSIZE
                        Set the lvm snapshot size when creating a new
                        snapshot. Please add G for Gigabytes or M for
                        Megabytes, i.e. 500M or 8G. Default 5G.
  --lvm-dirmount LVM_DIRMOUNT
                        Set the directory you want to mount the lvm snapshot
                        to. Default not set
  --lvm-volgroup LVM_VOLGROUP
                        Specify the volume group of your logical volume. This
                        is important to mount your snapshot volume. Default
                        not set
  --max-level MAX_LEVEL
                        Set the backup level used with tar to implement
                        incremental backup. If a level 1 is specified but no
                        level 0 is already available, a level 0 will be done
                        and subsequently backs to level 1. Default 0 (No
  --always-level ALWAYS_LEVEL
                        Set backup maximum level used with tar to implement
                        incremental backup. If a level 3 is specified, the
                        backup will be executed from level 0 to level 3 and to
                        that point always a backup level 3 will be executed.
                        It will not restart from level 0. This option has
                        precedence over --max-backup-level. Default False
  --restart-always-level RESTART_ALWAYS_LEVEL
                        Restart the backup from level 0 after n days. Valid
                        only if --always-level option if set. If --always-
                        level is used together with --remove-older-then, there
                        might be the chance where the initial level 0 will be
                        removed Default False (Disabled)
  -R REMOVE_OLDER_THAN, --remove-older-then REMOVE_OLDER_THAN, --remove-older-than REMOVE_OLDER_THAN
                        Checks in the specified container for object older
                        than the specified days.If i.e. 30 is specified, it
                        will remove the remote object older than 30 days.
                        Default False (Disabled) The option --remove-older-
                        then is deprecated and will be removed soon
  --remove-from-date REMOVE_FROM_DATE
                        Checks the specified container and removes objects
                        older than the provided datetime in the form "YYYY-MM-
                        DDThh:mm:ss i.e. "1974-03-25T23:23:23". Make sure the
                        "T" is between date and time
  --no-incremental      Disable incremental feature. By default freezer build
                        the meta data even for level 0 backup. By setting this
                        option incremental meta data is not created at all.
                        Default disabled
  --hostname HOSTNAME   Set hostname to execute actions. If you are executing
                        freezer from one host but you want to delete objects
                        belonging to another host then you can set this option
                        that hostname and execute appropriate actions. Default
                        current node hostname.
  --mysql-conf MYSQL_CONF
                        Set the MySQL configuration file where freezer
                        retrieve important information as db_name, user,
                        password, host, port. Following is an example of
                        config file: # cat ~/.freezer/backup_mysql_conf host =
                        <db-host> user = <mysqluser> password = <mysqlpass>
                        port = <db-port>
  --log-file LOG_FILE   Set log file. By default logs to
                        /var/log/freezer.logIf that file is not writable,
                        freezer tries to logto ~/.freezer/freezer.log
  --exclude EXCLUDE     Exclude files, given as a PATTERN.Ex: --exclude
                        '*.log' will exclude any file with name ending with
                        .log. Default no exclude
  --dereference-symlink {none,soft,hard,all}
                        Follow hard and soft links and archive and dump the
                        files they refer to. Default False.
  -U, --upload          Upload to Swift the destination file passed to the -d
                        option. Default upload the data
  --encrypt-pass-file ENCRYPT_PASS_FILE
                        Passing a private key to this option, allow you to
                        encrypt the files before to be uploaded in Swift.
                        Default do not encrypt.
  -M MAX_SEGMENT_SIZE, --max-segment-size MAX_SEGMENT_SIZE
                        Set the maximum file chunk size in bytes to upload to
                        swift Default 67108864 bytes (64MB)
  --restore-abs-path RESTORE_ABS_PATH
                        Set the absolute path where you want your data
                        restored. Default False.
  --restore-from-host RESTORE_FROM_HOST
                        Set the hostname used to identify the data you want to
                        restore from. If you want to restore data in the same
                        host where the backup was executed just type from your
                        shell: "$ hostname" and the output is the value that
                        needs to be passed to this option. Mandatory with
                        Restore Default False.
  --restore-from-date RESTORE_FROM_DATE
                        Set the absolute path where you want your data
                        restored. Please provide datetime in format "YYYY-MM-
                        DDThh:mm:ss" i.e. "1979-10-03T23:23:23". Make sure the
                        "T" is between date and time Default False.
  --max-priority        Set the cpu process to the highest priority (i.e. -20
                        on Linux) and real-time for I/O. The process priority
                        will be set only if nice and ionice are installed
                        Default disabled. Use with caution.
  -V, --version         Print the release version and exit
  -q, --quiet           Suppress error messages
  --insecure            Allow to access swift servers without checking SSL
  --os-auth-ver {1,2,3}
                        Swift auth version, could be 1, 2 or 3
  --proxy PROXY         Enforce proxy that alters system HTTP_PROXY and
                        HTTPS_PROXY, use '' to eliminate all system proxies
  --dry-run             Do everything except writing or removing objects
  --upload-limit UPLOAD_LIMIT
                        Upload bandwidth limit in Bytes per sec. Can be
                        invoked with dimensions (10K, 120M, 10G).
  --cinder-vol-id CINDER_VOL_ID
                        Id of cinder volume for backup
  --nova-inst-id NOVA_INST_ID
                        Id of nova instance for backup
  --cindernative-vol-id CINDERNATIVE_VOL_ID
                        Id of cinder volume for native backup
  --download-limit DOWNLOAD_LIMIT
                        Download bandwidth limit in Bytes per sec. Can be
                        invoked with dimensions (10K, 120M, 10G).
  --sql-server-conf SQL_SERVER_CONF
                        Set the SQL Server configuration file where freezer
                        retrieve the sql server instance. Following is an
                        example of config file: instance = <db-instance>
  --vssadmin VSSADMIN   Create a backup using a snapshot on windows using
                        vssadmin. Options are: True and False, default is True