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Docker container for CloudBerry Backup (Linux Edition)
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README.md

Docker container for CloudBerry Backup

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This is a Docker container for CloudBerry Backup.

The GUI of the application is accessed through a modern web browser (no installation or configuration needed on client side) or via any VNC client.


CloudBerry Backup logoCloudBerry Backup

Backup files and folders to cloud storage of your choice: Amazon S3, Azure Blob Storage, Google Cloud Storage, HP Cloud, Rackspace Cloud Files, OpenStack, DreamObjects and other.


Table of Content

Quick Start

NOTE: The Docker command provided in this quick start is given as an example and parameters should be adjusted to your need.

Launch the CloudBerry Backup docker container with the following command:

docker run -d \
    --name=cloudberry-backup \
    -p 5800:5800 \
    -v /docker/appdata/cloudberry-backup:/config:rw \
    -v $HOME:/storage:ro \
    jlesage/cloudberry-backup

Where:

  • /docker/appdata/cloudberry-backup: This is where the application stores its configuration, log and any files needing persistency.
  • $HOME: This location contains files from your host that need to be accessible by the application.

Browse to http://your-host-ip:5800 to access the CloudBerry Backup GUI. Files from the host appear under the /storage folder in the container.

Usage

docker run [-d] \
    --name=cloudberry-backup \
    [-e <VARIABLE_NAME>=<VALUE>]... \
    [-v <HOST_DIR>:<CONTAINER_DIR>[:PERMISSIONS]]... \
    [-p <HOST_PORT>:<CONTAINER_PORT>]... \
    jlesage/cloudberry-backup
Parameter Description
-d Run the container in background. If not set, the container runs in foreground.
-e Pass an environment variable to the container. See the Environment Variables section for more details.
-v Set a volume mapping (allows to share a folder/file between the host and the container). See the Data Volumes section for more details.
-p Set a network port mapping (exposes an internal container port to the host). See the Ports section for more details.

Environment Variables

To customize some properties of the container, the following environment variables can be passed via the -e parameter (one for each variable). Value of this parameter has the format <VARIABLE_NAME>=<VALUE>.

Variable Description Default
USER_ID ID of the user the application runs as. See User/Group IDs to better understand when this should be set. 1000
GROUP_ID ID of the group the application runs as. See User/Group IDs to better understand when this should be set. 1000
SUP_GROUP_IDS Comma-separated list of supplementary group IDs of the application. (unset)
UMASK Mask that controls how file permissions are set for newly created files. The value of the mask is in octal notation. By default, this variable is not set and the default umask of 022 is used, meaning that newly created files are readable by everyone, but only writable by the owner. See the following online umask calculator: http://wintelguy.com/umask-calc.pl (unset)
TZ TimeZone of the container. Timezone can also be set by mapping /etc/localtime between the host and the container. Etc/UTC
KEEP_APP_RUNNING When set to 1, the application will be automatically restarted if it crashes or if user quits it. 0
APP_NICENESS Priority at which the application should run. A niceness value of -20 is the highest priority and 19 is the lowest priority. By default, niceness is not set, meaning that the default niceness of 0 is used. NOTE: A negative niceness (priority increase) requires additional permissions. In this case, the container should be run with the docker option --cap-add=SYS_NICE. (unset)
CLEAN_TMP_DIR When set to 1, all files in the /tmp directory are delete during the container startup. 1
DISPLAY_WIDTH Width (in pixels) of the application's window. 1280
DISPLAY_HEIGHT Height (in pixels) of the application's window. 768
SECURE_CONNECTION When set to 1, an encrypted connection is used to access the application's GUI (either via web browser or VNC client). See the Security section for more details. 0
VNC_PASSWORD Password needed to connect to the application's GUI. See the VNC Password section for more details. (unset)
X11VNC_EXTRA_OPTS Extra options to pass to the x11vnc server running in the Docker container. WARNING: For advanced users. Do not use unless you know what you are doing. (unset)
ENABLE_CJK_FONT When set to 1, open source computer font WenQuanYi Zen Hei is installed. This font contains a large range of Chinese/Japanese/Korean characters. 0
CBB_WEB_INTERFACE_USER Username to use to login to the CloudBerry Backup's web interface. (unset)
CBB_WEB_INTERFACE_PASSWORD Password to use to login to the CloudBerry Backup's web interface.[br][span style='color: red;'][b]Warning:[/b][/span] See documentation for a more secure way to specify the password. (unset)

Data Volumes

The following table describes data volumes used by the container. The mappings are set via the -v parameter. Each mapping is specified with the following format: <HOST_DIR>:<CONTAINER_DIR>[:PERMISSIONS].

Container path Permissions Description
/config rw This is where the application stores its configuration, log and any files needing persistency.
/storage ro This location contains files from your host that need to be accessible by the application.

Ports

Here is the list of ports used by the container. They can be mapped to the host via the -p parameter (one per port mapping). Each mapping is defined in the following format: <HOST_PORT>:<CONTAINER_PORT>. The port number inside the container cannot be changed, but you are free to use any port on the host side.

Port Mapping to host Description
5800 Mandatory Port used to access the application's GUI via the web interface.
5900 Optional Port used to access the application's GUI via the VNC protocol. Optional if no VNC client is used.
43210 Optional Port used to access the CloudBerry Backup's web interface via HTTP.
43211 Optional Port used to access the CloudBerry Backup's web interface via HTTPs.

Changing Parameters of a Running Container

As seen, environment variables, volume mappings and port mappings are specified while creating the container.

The following steps describe the method used to add, remove or update parameter(s) of an existing container. The generic idea is to destroy and re-create the container:

  1. Stop the container (if it is running):
docker stop cloudberry-backup
  1. Remove the container:
docker rm cloudberry-backup
  1. Create/start the container using the docker run command, by adjusting parameters as needed.

NOTE: Since all application's data is saved under the /config container folder, destroying and re-creating a container is not a problem: nothing is lost and the application comes back with the same state (as long as the mapping of the /config folder remains the same).

Docker Compose File

Here is an example of a docker-compose.yml file that can be used with Docker Compose.

Make sure to adjust according to your needs. Note that only mandatory network ports are part of the example.

version: '3'
services:
  cloudberry-backup:
    build: .
    ports:
      - "5800:5800"
    volumes:
      - "/docker/appdata/cloudberry-backup:/config:rw"
      - "$HOME:/storage:ro"

Docker Image Update

If the system on which the container runs doesn't provide a way to easily update the Docker image, the following steps can be followed:

  1. Fetch the latest image:
docker pull jlesage/cloudberry-backup
  1. Stop the container:
docker stop cloudberry-backup
  1. Remove the container:
docker rm cloudberry-backup
  1. Start the container using the docker run command.

Synology

For owners of a Synology NAS, the following steps can be use to update a container image.

  1. Open the Docker application.
  2. Click on Registry in the left pane.
  3. In the search bar, type the name of the container (jlesage/cloudberry-backup).
  4. Select the image, click Download and then choose the latest tag.
  5. Wait for the download to complete. A notification will appear once done.
  6. Click on Container in the left pane.
  7. Select your CloudBerry Backup container.
  8. Stop it by clicking Action->Stop.
  9. Clear the container by clicking Action->Clear. This removes the container while keeping its configuration.
  10. Start the container again by clicking Action->Start. NOTE: The container may temporarily disappear from the list while it is re-created.

unRAID

For unRAID, a container image can be updated by following these steps:

  1. Select the Docker tab.
  2. Click the Check for Updates button at the bottom of the page.
  3. Click the update ready link of the container to be updated.

User/Group IDs

When using data volumes (-v flags), permissions issues can occur between the host and the container. For example, the user within the container may not exists on the host. This could prevent the host from properly accessing files and folders on the shared volume.

To avoid any problem, you can specify the user the application should run as.

This is done by passing the user ID and group ID to the container via the USER_ID and GROUP_ID environment variables.

To find the right IDs to use, issue the following command on the host, with the user owning the data volume on the host:

id <username>

Which gives an output like this one:

uid=1000(myuser) gid=1000(myuser) groups=1000(myuser),4(adm),24(cdrom),27(sudo),46(plugdev),113(lpadmin)

The value of uid (user ID) and gid (group ID) are the ones that you should be given the container.

Accessing the GUI

Assuming that container's ports are mapped to the same host's ports, the graphical interface of the application can be accessed via:

  • A web browser:
http://<HOST IP ADDR>:5800
  • Any VNC client:
<HOST IP ADDR>:5900

Security

By default, access to the application's GUI is done over an unencrypted connection (HTTP or VNC).

Secure connection can be enabled via the SECURE_CONNECTION environment variable. See the Environment Variables section for more details on how to set an environment variable.

When enabled, application's GUI is performed over an HTTPs connection when accessed with a browser. All HTTP accesses are automatically redirected to HTTPs.

When using a VNC client, the VNC connection is performed over SSL. Note that few VNC clients support this method. SSVNC is one of them.

SSVNC

SSVNC is a VNC viewer that adds encryption security to VNC connections.

While the Linux version of SSVNC works well, the Windows version has some issues. At the time of writing, the latest version 1.0.30 is not functional, as a connection fails with the following error:

ReadExact: Socket error while reading

However, for your convienence, an unoffical and working version is provided here:

https://github.com/jlesage/docker-baseimage-gui/raw/master/tools/ssvnc_windows_only-1.0.30-r1.zip

The only difference with the offical package is that the bundled version of stunnel has been upgraded to version 5.49, which fixes the connection problems.

Certificates

Here are the certificate files needed by the container. By default, when they are missing, self-signed certificates are generated and used. All files have PEM encoded, x509 certificates.

Container Path Purpose Content
/config/certs/vnc-server.pem VNC connection encryption. VNC server's private key and certificate, bundled with any root and intermediate certificates.
/config/certs/web-privkey.pem HTTPs connection encryption. Web server's private key.
/config/certs/web-fullchain.pem HTTPs connection encryption. Web server's certificate, bundled with any root and intermediate certificates.

NOTE: To prevent any certificate validity warnings/errors from the browser or VNC client, make sure to supply your own valid certificates.

NOTE: Certificate files are monitored and relevant daemons are automatically restarted when changes are detected.

VNC Password

To restrict access to your application, a password can be specified. This can be done via two methods:

  • By using the VNC_PASSWORD environment variable.
  • By creating a .vncpass_clear file at the root of the /config volume. This file should contains the password in clear-text. During the container startup, content of the file is obfuscated and moved to .vncpass.

The level of security provided by the VNC password depends on two things:

  • The type of communication channel (encrypted/unencrypted).
  • How secure access to the host is.

When using a VNC password, it is highly desirable to enable the secure connection to prevent sending the password in clear over an unencrypted channel.

ATTENTION: Password is limited to 8 characters. This limitation comes from the Remote Framebuffer Protocol RFC (see section 7.2.2). Any characters beyhond the limit are ignored.

Reverse Proxy

The following sections contains NGINX configuration that need to be added in order to reverse proxy to this container.

A reverse proxy server can route HTTP requests based on the hostname or the URL path.

Routing Based on Hostname

In this scenario, each hostname is routed to a different application/container.

For example, let's say the reverse proxy server is running on the same machine as this container. The server would proxy all HTTP requests sent to cloudberry-backup.domain.tld to the container at 127.0.0.1:5800.

Here are the relevant configuration elements that would be added to the NGINX configuration:

map $http_upgrade $connection_upgrade {
	default upgrade;
	''      close;
}

upstream docker-cloudberry-backup {
	# If the reverse proxy server is not running on the same machine as the
	# Docker container, use the IP of the Docker host here.
	# Make sure to adjust the port according to how port 5800 of the
	# container has been mapped on the host.
	server 127.0.0.1:5800;
}

server {
	[...]

	server_name cloudberry-backup.domain.tld;

	location / {
	        proxy_pass http://docker-cloudberry-backup;
	}

	location /websockify {
		proxy_pass http://docker-cloudberry-backup;
		proxy_http_version 1.1;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection $connection_upgrade;
		proxy_read_timeout 86400;
	}
}

Routing Based on URL Path

In this scenario, the hostname is the same, but different URL paths are used to route to different applications/containers.

For example, let's say the reverse proxy server is running on the same machine as this container. The server would proxy all HTTP requests for server.domain.tld/cloudberry-backup to the container at 127.0.0.1:5800.

Here are the relevant configuration elements that would be added to the NGINX configuration:

map $http_upgrade $connection_upgrade {
	default upgrade;
	''      close;
}

upstream docker-cloudberry-backup {
	# If the reverse proxy server is not running on the same machine as the
	# Docker container, use the IP of the Docker host here.
	# Make sure to adjust the port according to how port 5800 of the
	# container has been mapped on the host.
	server 127.0.0.1:5800;
}

server {
	[...]

	location = /cloudberry-backup {return 301 $scheme://$http_host/cloudberry-backup/;}
	location /cloudberry-backup/ {
		proxy_pass http://docker-cloudberry-backup/;
		location /cloudberry-backup/websockify {
			proxy_pass http://docker-cloudberry-backup/websockify/;
			proxy_http_version 1.1;
			proxy_set_header Upgrade $http_upgrade;
			proxy_set_header Connection $connection_upgrade;
			proxy_read_timeout 86400;
		}
	}
}

Shell Access

To get shell access to a the running container, execute the following command:

docker exec -ti CONTAINER sh

Where CONTAINER is the ID or the name of the container used during its creation (e.g. crashplan-pro).

CloudBerry Backup Web Interface

CloudBerry Backup provides its own web interface. It can be accessed via HTTP port 43210 and/or HTTPs port 43211.

Credentials

A username and password must be configured before being able to login to the web interface.

The username is set via the CBB_WEB_INTERFACE_USER environment variable.

There are two ways of setting the password:

  • Via the CBB_WEB_INTERFACE_PASSWORD environment variable.
  • By storing the password hash in /config/.cbb_web_interface_pass_hash (container path).

The password hash can be generated by the command mkpasswd. For example, to generate the hash using the SHA-512 method:

mkpasswd -m sha-512

The whole output of the command must be saved into /config/.cbb_web_interface_pass_hash. Here is an example of the output:

$6$VkhGUiCpmE$Mqm8k4oBKF0O4gqstzUvq32FJ3nxgAMjyhqbESCPj8nqSvcQoZw4d/U.oQYN/rsh4FonIoPjsvOn/WQSG84RE/

An other way of generating the password hash is to set the password in clear-text in /config/.cbb_web_interface_clear_text_pass. When the container starts, a hash is performed using the content of this file and is automatically saved to /config/.cbb_web_interface_pass_hash. Then, the clear-text password file is deleted.

Support or Contact

Having troubles with the container or have questions? Please create a new issue.

For other great Dockerized applications, see https://jlesage.github.io/docker-apps.

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