This documentation assumes that you already have access to a SQL Server database, either on a server of your own or hosted elsewhere, and that Guacamole has already been installed using Glyptodon Enterprise. If you do not already a SQL Server database ready, please set up SQL Server before proceeding. If you do not already have Guacamole installed, please see the installation instructions.
Installing SQL Server support for Guacamole
Glyptodon Enterprise packages Guacamole’s SQL Server support within the glyptodon-guacamole-auth-jdbc-sqlserver package. This package must be installed before creating Guacamole’s database within SQL Server, as it includes the SQL scripts necessary for doing so:
Creating and initializing the Guacamole database
If you haven’t already done so, a database specific to Guacamole needs to be created within SQL Server. The database can be called anything you like and there are no specific requirements for the size of the database, collation, etc.; all that matters is that the database be dedicated to Guacamole, and not shared by different applications:
Guacamole will not automatically initialize the database with the required schema. You will need to do this yourself using the SQL scripts provided with the glyptodon-guacamole-auth-jdbc-sqlserver package, which are located within the
|Creates all tables and indexes which are required for the SQL Server authentication extension to function.|
|Creates a default administrative user, “guacadmin”, with password “guacadmin”. These credentials will need to be changed once SQL Server authentication is confirmed to be working.|
The above scripts must be run in sequence. The first script,
001-create-schema.sql, creates the database schema:
The second script,
002-create-admin-user.sql, defines a default administrative user and can only successfully run if the tables created by the first script exist:
Creating a Database User for Guacamole
To execute queries against the database, Guacamole will need its own database user with sufficient privileges. Because Guacamole does not automatically apply or update its own schema, the required privileges are minimal, dealing only with creation and maintenance of data within already-defined tables and indexes. Permission to
DELETE from all tables in the database is sufficient and exactly covered by SQL Server's
The login to be used by Guacamole must use SQL Server authentication, with a password which will eventually be stored within
The login must then be associated with a user specific to the Guacamole database:
To grant the necessary
DELETE permissions for all tables in the Guacamole database, the user must be added to the database's
Connecting Guacamole to SQL Server
Once the database and database user have been prepared, Guacamole’s main configuration file,
/etc/guacamole/guacamole.properties, must be modified to specify the credentials of that user and to point the SQL Server instance and database:
The guacamole.properties file provided with Glyptodon Enterprise is organized into sections documented with blocks of comments and example properties. The first section which must be modified is marked “JDBC-1” and defines the TCP connection information for the database in use. Uncomment the sqlserver-hostname and sqlserver-port properties, modifying their values to point to your instance of SQL Server:
The “JDBC-2” section, which defines the database name and associated credentials, must also be modified to specify the correct database name, username, and password. These values are given with the sqlserver-database, sqlserver-username, and sqlserver-password properties respectively:
Guacamole will generally only load new extensions and reread
guacamole.properties during the startup process. To apply the configuration changes, Guacamole must be restarted:
You will not have a standalone "guacamole" service if you have not deployed Guacamole automatically with the "glyptodon-guacamole-standalone" package. This will be the case if:
- You have chosen to manually deploy Guacamole under your own install of Apache Tomcat or JBoss, rather than use the provided version of Tomcat.
- You are maintaining a deployment of Glyptodon Enterprise that was originally installed before the 2.5 release (2021-09-16).
You will instead need to manually restart your install of Tomcat:
If you are using SELinux (the default on both CentOS and RHEL), you must also configure SELinux to allow Tomcat to connect to the database over the network:
If Guacamole is not accessible after the Tomcat service has been restarted, verify that you have indeed configured SELinux to allow Tomcat to connect to the database and check the SELinux audit logs (
/var/log/audit/audit.log) for AVC denials.
Updating SELinux is not necessary if using the version of Tomcat bundled with the glyptodon-guacamole-standalone package.
To make sure everything is working as expected, you should also visit your Guacamole instance with a web browser (most likely at
http://HOSTNAME:8080/guacamole/, where “HOSTNAME” is the hostname or IP address of your server). If all is working correctly, you should see a login screen with a username/password prompt, and you will be able to log in using the default account created with the
Once you have verified that you can log in successfully, you should immediately change the password, as keeping default accounts unchanged is dangerous. While logged into Guacamole, you can access the built-in password changing interface by clicking on your username in the upper-right corner of the screen and selecting “Settings”.