CTDB and Clustered Samba

Introduction

CTDB is a clustered database component in clustered Samba that provides a high-availability load-sharing CIFS server cluster.

The main functions of CTDB are:

• Provide a clustered version of the TDB database with automatic rebuild/recovery of the databases upon node failures.

• Monitor nodes in the cluster and services running on each node.

• Manage a pool of public IP addresses that are used to provide services to clients. Alternatively, CTDB can be used with LVS.

Combined with a cluster filesystem CTDB provides a full high-availablity (HA) environment for services such as clustered Samba, NFS and other services.

It should be noted that CTDB cannot be used with Samba AD DC's, it should only be used with Unix domain members or standalone servers.

Supported platforms

CTDB is primarily developed and tested on Linux. A subset of features may work on other platforms.

Getting and Building CTDB

Samba and CTDB must be installed on all nodes of a cluster. CTDB is part of Samba (>= 4.2.0), so to get CTDB you need to get Samba.

More details:

• Getting and Building CTDB
• Upgrading a CTDB cluster

Configuring Clusters with CTDB

• Basic CTDB configuration
• Setting up a cluster filesystem
• Configuring the CTDB recovery lock
• Adding public IP addresses
• Configuring clustered Samba
• Setting up CTDB for Clustered NFS
• Setting up CTDB with other services
• Advanced CTDB configuration
• CTDB with GPFS
• CTDB with GFS

Analysing CTDB problems

• Merged logs
• CTDB log file search patterns

Developing CTDB

• CTDB database design
• Running CTDB tests

Historical and Background Information

Note that some of this information is out of date.

• CTDB Project
• Clustered Samba
• Samba & Clustering
• Michael Adam's clustered NAS articles