github.com/tiredofit/docker-gcds

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About

This will build a container for Google Cloud Directory Sync. A tool to synchronize user and group data from your local LDAP directory to Google Workspace.

• Executes synchronization routines on a scheduled basis
• Error detection with customizable notification endpoints
• Sends statistics to Zabbix Server

This image needs manual configuration to get started. You will need to manually create the configuration file on another system with the config-manager GCDS GUI before the scheduler will occur. You will also need to import an OAUTH Token into that configuration file that was generated from another machine as of GCDS 5.x versions.

Maintainer

• Dave Conroy

Table of Contents

• About
• Maintainer
• Table of Contents
• Prerequisites and Assumptions
• Installation
  • Build from Source
  • Prebuilt Images
• Configuration
  • Quick Start
  • Persistent Storage
  • Environment Variables
    • Base Images used
    • Notifications
      • Custom Notifications
      • Email Notifications
      • Matrix Notifications
      • Mattermost Notifications
      • Rocketchat Notifications
• Maintenance
  • Shell Access
  • Manual Synchronization
• Contributions
• Support
  • Usage
  • Bugfixes
  • Feature Requests
  • Updates
• License
• References

Prerequisites and Assumptions

• You have an active Google Workspace Account with appropriate Administration privileges.

Installation

Build from Source

Clone this repository and build the image with docker build <arguments> (imagename) .

Prebuilt Images

Builds of the image are available on Docker Hub

docker pull docker.io/tiredofit/gcds:(latest)

Configuration

Quick Start

• The quickest way to get started is using docker-compose. See the examples folder for a working compose.yml that can be modified for development or production use.

• On another machine, you must setup Oauth tokens, as this container cannot set them up for you. You must enter upgrade-config -exportkeys encrypted.key [password] on the source system.

• Get the contents of this new file and paste it in OAUTH_TOKEN environment variable or use upgrade-config -importkeys encrypted.key [password] inside the container.

• Set MODE environment variables

• Set any environment variables to support scheduling or notifications

Persistent Storage

The following directories are used for configuration and can be mapped for persistent storage.

Directory	Description
/config/	Map this directory and place your GCDS .xml file here. State information is also stored here for encryption.
/logs/	GCDS Log Output Directory

Environment Variables

Base Images used

This image relies on a Debian Linux base image that relies on an init system for added capabilities. Outgoing SMTP capabilities are handlded via msmtp. Individual container performance monitoring is performed by zabbix-agent. Additional tools include: bash,curl,less,logrotate,nano.

Be sure to view the following repositories to understand all the customizable options:

Image	Description
OS Base	Customized Image based on debian Linux

Parameter	Description	Default
AUTO_UPGRADE_CONFIG	Automatically upgrade older versions configuration AND import OAUTH_TOKEN	FALSE
CONFIG_PATH	Configuration Path	/config/
CONFIG_FILE	The name of your GCDS configuration file (e.g. config_file.xml)
DOMAIN	The Domain in question that is being synced
DRY_RUN	Execute a Dry Run Test TRUE / FALSE	TRUE
FLUSH_REMOTE_DATA	Enable Flushing of Data after Sync TRUE/FALSE	FALSE
MODE	STANDALONE (Do Nothing) SCHEDULER (run at scheduled time)	STANDALONE
LOG_LEVEL	GCDS Error Logging level (e.g. ERROR)	INFO
LOG_PATH	Path where logs are kept	/logs/
LOG_FILE	Name of Logfile to output	${DOMAIN}-sync.log
OAUTH_TOKEN	Oauth Token string as recieved from another machine capable of exporting authentication information eg 3FD988...
OAUTH_TOKEN_PASS	If token has been encrypted, enter it here
SYNC_BEGIN	What time to do the first sync. Defaults to immediate. Must be in one of two formats	+0
	Absolute HHMM, e.g. 2330 or 0415
	Relative +MM, i.e. how many minutes after starting the container, e.g. +0 (immediate), +10 (in 10 minutes), or +90 in an hour and a half
SYNC_INTERVAL	How often to sync, in minutes.	60

Notifications

Parameter	Description	Default
NOTIFICATION_TYPE	CUSTOM EMAIL MATRIX MATTERMOST ROCKETCHAT - Seperate Multiple by commas

Custom Notifications

The following is sent to the custom script. Use how you wish:

$1 unix timestamp
$2 logfile
$3 errorcode
$4 subject
$5 body/error message

Parameter	Description	Default
NOTIFICATION_CUSTOM_SCRIPT	Path and name of custom script to execute notification.

Email Notifications

Parameter	Description	Default
MAIL_FROM	What email address to send mail from for errors
MAIL_TO	What email address to send mail to for errors. Send to multiple by seperating with comma.
SMTP_HOST	What SMTP server to use for sending mail
SMTP_PORT	What SMTP port to use for sending mail

Matrix Notifications

Fetch a MATRIX_ACCESS_TOKEN:

curl -XPOST -d '{"type":"m.login.password", "user":"myuserid", "password":"mypass"}' "https://matrix.org/_matrix/client/r0/login"

Copy the JSON response access_token that will look something like this:

{"access_token":"MDAxO...blahblah","refresh_token":"MDAxO...blahblah","home_server":"matrix.org","user_id":"@myuserid:matrix.org"}

Parameter	Description	Default
MATRIX_HOST	URL (https://matrix.example.com) of Matrix Homeserver
MATRIX_ROOM	Room ID eg \!abcdef:example.com to send to. Send to multiple by seperating with comma.
MATRIX_ACCESS_TOKEN	Access token of user authorized to send to room

Mattermost Notifications

Parameter	Description	Default
MATTERMOST_WEBHOOK_URL	Full URL to send webhook notifications to
MATTERMOST_RECIPIENT	Channel or User to send Webhook notifications to. Send to multiple by seperating with comma.
MATTERMOST_USERNAME	Username to send as eg GCDS

Rocketchat Notifications

Parameter	Description	Default
ROCKETCHAT_WEBHOOK_URL	Full URL to send webhook notifications to
ROCKETCHAT_RECIPIENT	Channel or User to send Webhook notifications to. Send to multiple by seperating with comma.
ROCKETCHAT_USERNAME	Username to send as eg GCDS

Maintenance

Shell Access

For debugging and maintenance purposes you may want access the containers shell.

docker exec -it (whatever your container name) bash

Manual Synchronization

Visit the inside of the container and execute sync-now

Contributions

Welcomed. Please fork the repository and submit a pull request for any bug fixes, features or additions you propose to be included in the image. If it does not impact my intended usage case, it will be merged into the tree, tagged as a release and credit to the contributor in the CHANGELOG.

Support

These images were built to serve a specific need in a production environment and gradually have had more functionality added based on requests from the community.

Usage

• The Discussions board is a great place for working with the community on tips and tricks of using this image.
• Sponsor me for personalized support.

Bugfixes

• Please, submit a Bug Report if something isn't working as expected. I'll do my best to issue a fix in short order.

Feature Requests

• Feel free to submit a feature request, however there is no guarantee that it will be added, or at what timeline.
• Sponsor me regarding development of features.

Updates

• Best effort to track upstream changes, More priority if I am actively using the image in a production environment.
• Sponsor me for up to date releases.

License

MIT. See LICENSE for more details.

References

• https://support.google.com/a/answer/106368?hl=en&ref_topic=4497998