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The OpenStack Backup Restore and Disaster Recovery as a Service Platform

Project description


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 file system using point-in-time snapshot
  • Strong encryption supported: AES-256-CFB
  • Backup file system tree directly (without volume snapshot)
  • Backup journaled MongoDB directory tree using lvm snapshot to Swift
  • Backup MySQL with lvm snapshot
  • Restore data from a specific date automatically to 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 to the provided parameters
  • Multiple storage media support (Swift, local file system, or 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
  • 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
  • libffi-dev
  • libssl-dev
  • python-dev
  • At least 128 MB of memory reserved for Freezer

Windows Requirements

Add binaries to Windows Path

Go to Control PanelSystem and SecuritySystem and then Advanced System Settings, and click Environment Variables under System Variables edit Path and append in the end. - ;C:\Sync - ;C:\OpenSSL-Win64\bin - ;C:\Python27;C:\Python27\Lib\site-packages\;C:\Python27\Scripts\

The following components support Windows OS Platform:

  • freezer-agent
  • freezer-scheduler

Install Windows Scheduler

Freezer scheduler on windows run as a windows service and it needs to be installed as a user service.

  • open cmd as admin
  • whoami
  • cd C:\Python27\Lib\site-packages\freezer\scheduler
  • python –username {whoami} –password {pc-password} install

Unofficial Installer for Windows

Freezer offers a [windows installer] ( supported by the community

Installation & Env Setup

Install required packages

Ubuntu / Debian

Swift client and Keystone client:

$ sudo apt-get install -y python-dev
For python3:
$ sudo apt-get install -y python3-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 vars 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 execute backups using LVM snapshot, so freezer will execute a backup on point-in-time data. This avoids the risk of data inconsistencies and corruption.


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 options can be set from the 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 freezer-agent --path-to-backup /data/dir/to/backup
--container freezer_new-data-backup --backup-name my-backup-name

* On windows (need admin rights)*
> freezer-agent --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 will 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 to see if your backup executed correctly by looking at /var/log/freezer.log

Execute a MongoDB backup using lvm snapshot:

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

$ mount

Once we know the volume on which our Mongo data is mounted, 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 freezer-agent --lvm-srcvol /dev/mongo/mongolv --lvm-dirmount /var/lib/snapshot-backup
--lvm-volgroup mongo --path-to-backup /var/lib/snapshot-backup/mongod_ops2
--container freezer_mongodb-backup-prod --exclude "*.lock" --mode mongo --backup-name mongod-ops2

Now freezer-agent creates an lvm snapshot of the volume /dev/mongo/mongolv. If no options are provided, the default snapshot name is “freezer_backup_snap”. The snapshot vol will be mounted automatically on /var/lib/snapshot-backup, and the backup metadata and segments will be uploaded in the container mongodb-backup-prod with the name mongod-ops2.

Execute a file system backup using lvm snapshot:

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

MySQL backup requires 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 freezer-agent --lvm-srcvol /dev/mysqlvg/mysqlvol
--lvm-dirmount /var/snapshot-backup
--lvm-volgroup mysqlvg --path-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 parameters in command line arguments. Freezer doesn’t do any additional checks and assumes that making a backup of that image will be sufficient to restore your data in the future.

Execute a cinder backup:

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

Execute a MySQL backup with Cinder:

$ freezer-agent --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 a Nova parameter in the arguments. Freezer doesn’t do any additional checks and assumes that making a backup of that instance will be sufficient to restore your data in future.

Execute a nova backup:

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

Execute a MySQL backup with Nova:

$ freezer-agent --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 freezer-agent activities are logged into /var/log/freezer.log.

Swift, Local and SSH Storage

Freezer can use:

local storage - a 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 freezer-agent --path-to-backup /data/dir/to/backup
--container /tmp/my_backup_path/ --backup-name my-backup-name
--storage local

Restore example:

$ sudo freezer-agent --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 swift storage specify “–storage swift” or omit “–storage” parameter altogether (Swift storage is the default). And use “–container <swift-container-name>”

Backup example:

$ sudo freezer-agent --path-to-backup /data/dir/to/backup
--container freezer-container --backup-name my-backup-name
--storage swift

Restore example:

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

SSH storage - a folder on a 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 freezer-agent --path-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 freezer-agent  --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 writes or reads data should be stopped so that during the restore operation, the restored data is not inadvertantly read or written by the application.

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 freezer-agent --action restore --container freezer_foobar-container-2
--backup-name adminui.git
--hostname 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 freezer-agent --action restore --container freezer_foobar-container-2
--backup-name mysq-prod --hostname 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 freezer-agent --action restore --container freezer_foobar-container-2
--backup-name mongobigdata --hostname db-HP-DL380-host-001
--restore-abs-path /var/lib/mongo --restore-from-date "2014-05-23T23:23:23"

List remote containers:

$ sudo freezer-agent --action info

List remote objects in container:

$ sudo freezer-agent --action info --container freezer_testcontainer -l

Remove backups older then 1 day:

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

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

Execute a cinder restore:

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

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

Execute a nova restore:

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

Local storage restore execution:

$ sudo freezer-agent --action restore --container /local_backup_storage/
--backup-name adminui.git
--hostname git-HP-DL380-host-001 --restore-abs-path
--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 where the backups and restores are to be executed

Freezer uses 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 Freezer architecture is composed of the following components:

Component Description
Freezer Web UI Web interface that interacts with the Freezer API to configure and change settings. It provides most of the features from the freezer-agent CLI as well as advanced scheduler settings such as multi-node backup synchronization, metrics, and reporting.
Freezer Scheduler A client side component, running on the node where the data backup is to be executed. It consists of a daemon that retrieves the data from the freezer API and executes 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 manages 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 takes care of uploading jobs to the API by reading job files on the file system. It also has its own configuration file where job session or other settings like the freezer API polling interval can be configured. The Freezer scheduler manages jobs. For more information about jobs please refer to: freezer_api/README.rst under JOB the sections
Freezer Agent

Multiprocessing Python software that runs on the client side, where the data backup is to be executed. It can be executed standalone or by the Freezer Scheduler. The freezer-agent provides a 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 offers 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 constraint)
  • 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
  • Multi-platform as it can be run on Linux, Windows, *BSD and OSX
  • Automatic removal of old backups

freezerc binary is deprecated and won’t be available in next releases. Use freezer-agent instead.

Freezer API The API is used to store and provide metadata to the Freezer Web UI and to the Freezer Scheduler. Also the API is used to store session information for multi node backup synchronization. No workload data is stored in the API. For more information on 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 uses 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 to 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 segments 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 a 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 ensures data consistency.

By keeping the segments small, 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 snapshot size, because in case a quantity of data is being written to the source volume and consequently the lvm snapshot is filled up, then the data will be corrupted.

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

On the other hand, if a server has 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 features. The following basic logic happens when Freezer executes:

  1. Freezer starts the execution and checks if the provided backup name for the current node already exists in Swift.
  2. If the backup exists, then 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 arguments in the parameters, freezer assumes 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 as in the case of lvm or tar snapshots, but we will invoke nova snapshot instead of lvm or tar.

After that we will place the snapshot in a Swift container as a 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 its own mechanism for backups, and freezer supports it. But it also allows creating a glance image from volume and uploading to swift.

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

Parallel backup

Parallel backup can be executed only by config file. In config file you should create n additional sections that start with “storage:”

Example [storage:my_storage1], [storage:ssh], [storage:storage3]

Each storage section should have ‘container’ argument and all parameters related to the storage

Example: ssh-username, ssh-port

For swift storage you should provide additional parameter called ‘osrc’ Osrc should be a path to file with Openstack Credentials like:

export OS_AUTH_URL=http://url:5000/v3
export OS_PROJECT_NAME=project_name
export OS_USERNAME=username
export OS_PASSWORD=secret_password
export OS_USER_DOMAIN_NAME=Default
export OS_CACERT=/etc/ssl/certs/ca-certificates.crt
export OS_ENDPOINT_TYPE=internalURL

Example of Config file for two local storages and one swift storage:

action = backup
mode = fs
path_to_backup = /foo/
backup_name = mytest6
always_level = 2
max_segment_size = 67108864
container = /tmp/backup/
storage = local
container = /tmp/backup1/
container = /tmp/backup2/
container = test
osrc = openrc.osrc


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, 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 parameters 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 to 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 back to the default which is composed from the tenant-id and the hostname of the machine on which it is running.

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": "schedule_backups 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.


Dependencies notes

In stable/kilo and stable/liberty the module peppep3134daemon is imported from local path rather than pip. This generated many issues as the package is not in the global-requirements.txt of kilo and liberty. Also pbr in the kilo release does not support env markers which further complicated the installation.

Please check the FAQ to: FAQ.rst

Available options:

usage: freezer-agent [-h] [--action ACTION] [--always-level ALWAYS_LEVEL]
                 [--backup-name BACKUP_NAME]
                 [--cinder-vol-id CINDER_VOL_ID]
                 [--cindernative-vol-id CINDERNATIVE_VOL_ID]
                 [--command COMMAND] [--compression COMPRESSION]
                 [--config CONFIG] [--config-dir DIR] [--config-file PATH]
                 [--container CONTAINER] [--debug]
                 [--dereference-symlink DEREFERENCE_SYMLINK]
                 [--download-limit DOWNLOAD_LIMIT] [--dry-run]
                 [--encrypt-pass-file ENCRYPT_PASS_FILE]
                 [--exclude EXCLUDE] [--hostname HOSTNAME] [--insecure]
                 [--log-config-append PATH]
                 [--log-date-format DATE_FORMAT] [--log-dir LOG_DIR]
                 [--log-file PATH] [--log-format FORMAT]
                 [--lvm-auto-snap LVM_AUTO_SNAP]
                 [--lvm-dirmount LVM_DIRMOUNT]
                 [--lvm-snap-perm LVM_SNAPPERM]
                 [--lvm-snapname LVM_SNAPNAME]
                 [--lvm-snapsize LVM_SNAPSIZE] [--lvm-srcvol LVM_SRCVOL]
                 [--lvm-volgroup LVM_VOLGROUP] [--max-level MAX_LEVEL]
                 [--max-priority MAX_PRIORITY]
                 [--max-segment-size MAX_SEGMENT_SIZE]
                 [--metadata-out METADATA_OUT] [--mode MODE]
                 [--mysql-conf MYSQL_CONF]
                 [--no-incremental NO_INCREMENTAL] [--nodebug]
                 [--nodry-run] [--noinsecure] [--nooverwrite] [--noquiet]
                 [--nouse-syslog] [--nouse-syslog-rfc-format]
                 [--nova-inst-id NOVA_INST_ID] [--noverbose]
                 [--os-identity-api-version OS_IDENTITY_API_VERSION]
                 [--overwrite] [--path-to-backup PATH_TO_BACKUP]
                 [--proxy PROXY] [--quiet]
                 [--remove-from-date REMOVE_FROM_DATE]
                 [--remove-older-than REMOVE_OLDER_THAN]
                 [--restart-always-level RESTART_ALWAYS_LEVEL]
                 [--restore-abs-path RESTORE_ABS_PATH]
                 [--restore-from-date RESTORE_FROM_DATE]
                 [--snapshot SNAPSHOT] [--sql-server-conf SQL_SERVER_CONF]
                 [--ssh-host SSH_HOST] [--ssh-key SSH_KEY]
                 [--ssh-port SSH_PORT] [--ssh-username SSH_USERNAME]
                 [--storage STORAGE]
                 [--syslog-log-facility SYSLOG_LOG_FACILITY]
                 [--upload-limit UPLOAD_LIMIT] [--use-syslog]
                 [--use-syslog-rfc-format] [--verbose] [--version]
optional arguments:
-h, --help show this help message and exit
--action ACTION
 Set the action to be taken. backup and restore are self explanatory, info is used to retrieve info from the storage media, exec is used to execute a script, while admin is used to delete old backups and other admin actions. Default backup.
--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 (Disabled)
 The backup name you want to use to identify your backup on Swift
--cinder-vol-id CINDER_VOL_ID
 Id of cinder volume for backup
--cindernative-vol-id CINDERNATIVE_VOL_ID
 Id of cinder volume for native backup
--command COMMAND
 Command executed by exec action
--compression COMPRESSION
 compression algorithm to use. gzip is default algorithm
--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.
--config-dir DIR
 Path to a config directory to pull *.conf files from. This file set is sorted, so as to provide a predictable parse order if individual options are over-ridden. The set is parsed after the file(s) specified via previous –config-file, arguments hence over-ridden options in the directory take precedence.
--config-file PATH
 Path to a config file to use. Multiple config files can be specified, with values in later files taking precedence. Defaults to None.
 The Swift container (or path to local storage) used to upload files to
--debug, -d If set to true, the logging level will be set to DEBUG instead of the default INFO level.
--dereference-symlink DEREFERENCE_SYMLINK
 Follow hard and soft links and archive and dump the files they refer to. Default False.
--download-limit DOWNLOAD_LIMIT
 Download bandwidth limit in Bytes per sec. Can be invoked with dimensions (10K, 120M, 10G).
--dry-run Do everything except writing or removing objects
--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.
--exclude EXCLUDE
 Exclude files,given as a PATTERN.Ex: –exclude ‘*.log’ will exclude any file with name ending with .log. Default no exclude
--hostname HOSTNAME, --restore_from_host 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.
--insecure Allow to access swift servers without checking SSL certs.
--log-config-append PATH, --log_config PATH
 The name of a logging configuration file. This file is appended to any existing logging configuration files. For details about logging configuration files, see the Python logging module documentation. Note that when logging configuration files are used all logging configuration is defined in the configuration file and other logging configuration options are ignored (for example, log_format).
--log-date-format DATE_FORMAT
 Defines the format string for %(asctime)s in log records. Default: None . This option is ignored if log_config_append is set.
--log-dir LOG_DIR, --logdir LOG_DIR
 (Optional) The base directory used for relative log_file paths. This option is ignored if log_config_append is set.
--log-file PATH, --logfile PATH
 (Optional) Name of log file to send logging output to. If no default is set, logging will go to stderr as defined by use_stderr. This option is ignored if log_config_append is set.
--log-format FORMAT
 DEPRECATED. A logging.Formatter log message format string which may use any of the available logging.LogRecord attributes. This option is deprecated. Please use logging_context_format_string and logging_default_format_string instead. This option is ignored if log_config_append is set.
--lvm-auto-snap LVM_AUTO_SNAP
 Automatically guess the volume group and volume name for given PATH.
--lvm-dirmount LVM_DIRMOUNT
 Set the directory you want to mount the lvm snapshot to. If not provided, a unique name will be generated with thebasename /var/lib/freezer
--lvm-snap-perm LVM_SNAPPERM
 Set the lvm snapshot permission to use. If the permission is set to ro The snapshot will be immutable - read only -. If the permission is set to rw it will be mutable
--lvm-snapname LVM_SNAPNAME
 Set the name of the snapshot that will be created. If not provided, a unique name will be generated.
--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. It is also possible to use percentages as with the -l option of lvm, i.e. 80%FREE Default 1G.
--lvm-srcvol LVM_SRCVOL
 Set the lvm volume you want to take a snaphost from. Default no volume
--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 Incremental)
--max-priority 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.
 Set the maximum file chunk size in bytes to upload to swift Default 33554432 bytes (32MB)
--metadata-out METADATA_OUT
 Set the filename to which write the metadata regarding the backup metrics. Use ‘-‘ to output to standard output.
--mode MODE, -m MODE
 Set the technology to back from. Options are, fs (filesystem),mongo (MongoDB), mysql (MySQL), sqlserver (SQL Server) Default set to fs
--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: # backup_mysql_confhost = <db-host>user = <mysqluser>password = <mysqlpass>port = <db-port>
--no-incremental 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
--nodebug The inverse of –debug
--nodry-run The inverse of –dry-run
--noinsecure The inverse of –insecure
--nooverwrite The inverse of –overwrite
--noquiet The inverse of –quiet
--nouse-syslog The inverse of –use-syslog
 The inverse of –use-syslog-rfc-format
--nova-inst-id NOVA_INST_ID
 Id of nova instance for backup
--noverbose The inverse of –verbose
 The inverse of –watch-log-file
--os-identity-api-version OS_IDENTITY_API_VERSION, --os_auth_ver OS_IDENTITY_API_VERSION
 Openstack identity api version, can be 1, 2, 2.0 or 3
--overwrite With overwrite removes files from restore path before restore.
--path-to-backup PATH_TO_BACKUP, -F PATH_TO_BACKUP
 The file or directory you want to back up to Swift
--proxy PROXY Enforce proxy that alters system HTTP_PROXY and HTTPS_PROXY, use ‘’ to eliminate all system proxies
--quiet, -q Suppress error messages
--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
 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
--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)
--restore-abs-path RESTORE_ABS_PATH
 Set the absolute path where you want your data restored. Default False.
--restore-from-date RESTORE_FROM_DATE
 Set the date of the backup from which you want to restore.This will select the most recent backup previous to the specified date (included). Example: if the last backup was created at ‘2016-03-22T14:29:01’ and restore-from-date is set to ‘2016-03-22T14:29:01’, the backup will be restored successfully. The same for any date after that, even if the provided date is in the future. However if restore-from-date is set to ‘2016-03-22T14:29:00’ or before, that backup will not be found. 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 None.
--snapshot SNAPSHOT, -s SNAPSHOT
 Create a snapshot of the fs containing the resource to backup. When used, the lvm parameters will be guessed and/or the default values will be used, on windows it will invoke vssadmin
--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>
--ssh-host SSH_HOST
 Remote host for ssh storage only
--ssh-key SSH_KEY
 Path to ssh-key for ssh storage only
--ssh-port SSH_PORT
 Remote port for ssh storage only (default 22)
--ssh-username SSH_USERNAME
 Remote username for ssh storage only
--storage STORAGE
 Storage for backups. Can be Swift or Local now. Swift is default storage now. Local stores backups on the same defined path and swift will store files in container.
--syslog-log-facility SYSLOG_LOG_FACILITY
 Syslog facility to receive log lines. This option is ignored if log_config_append is set.
--upload-limit UPLOAD_LIMIT
 Upload bandwidth limit in Bytes per sec. Can be invoked with dimensions (10K, 120M, 10G).
--use-syslog Use syslog for logging. Existing syslog format is DEPRECATED and will be changed later to honor RFC5424. This option is ignored if log_config_append is set.
 Enables or disables syslog rfc5424 format for logging. If enabled, prefixes the MSG part of the syslog message with APP-NAME (RFC5424). This option is ignored if log_config_append is set.
--verbose, -v If set to false, the logging level will be set to WARNING instead of the default INFO level.
--version show program’s version number and exit
 Uses logging handler designed to watch file system. When log file is moved or removed this handler will open a new log file with specified path instantaneously. It makes sense only if log_file option is specified and Linux platform is used. This option is ignored if log_config_append is set.

Scheduler Options

To get an updated sample of freezer-scheduler configuration you the following command:

oslo-config-generator --config-file config-generator/scheduler.conf

you will find the update sample file in etc/scheduler.conf.sample

Agent Options

To list options available in freezer-agent use the following command:

oslo-config-generator --namespace freezer --namespace oslo.log

this will print all options to the screen you direct the output to a file if you want:

oslo-config-generator --namespace freezer --namespace oslo.log --output-file etc/agent.conf.sample

Bandwidth limitation (Trickle)

Trickle for bandwidth limiting ( How it works ): We have 3 cases to handle 1- User used –upload-limit or –download-limit from the cli We need to remove these limits from the cli arguments and then run trickle using subprocess


# freezer-agent --action backup -F /etc/ -C freezer --upload-limit = 1k

this will be translated to:

# trickle -u 1024 -d -1 freezer-agent --action backup -F /etc/ -C freezer

2- User used config files to execute an action

We need to create a new config file without the limits So we will get the all the arguments provided and remove limits then run trickle using subprocess

EX: We have a config file contains:

action = backup
storage = ssh
ssh_host =
ssh_username = saad
ssh_key = /home/saad/.ssh/saad
container = /home/saad/backups_freezers
backup_name = freezer_jobs
path_to_backup = /etc

and we are going to execute this job as follow:

freezer-agent --config /home/user/job1.ini

this will be translated to:

trickle -u 2048 -d 1024 freezer-agent --config /tmp/freezer_job_x21aj29

The new config file has the following arguments:

action = backup
storage = ssh
ssh_host =
ssh_username = saad
ssh_key = /home/saad/.ssh/saad
container = /home/saad/backups_freezers
backup_name = freezer_jobs
path_to_backup = /etc

3- Hybrid using config file and cli options we will use a mix of both procedures: - remove limits (cli or config ) - reproduce the same command again with trickle EX:

$ freezer-agent --config /home/user/job2.ini --upload-limit 1k

The Freezer logo is released under the licence Attribution 3.0 Unported (CC BY3.0).

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