High Availability and Load Balancing Cluster for Linux Terminal Services

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1 Linux Terminal Server Cluster High Availability and Load Balancing Cluster for Linux Terminal Services by Wolfgang Büch University of Hamburg

2 Who am I? Wolfgang Büch, Linux system administrator University of Hamburg Project leader: Linux Terminal Cluster

3 Content General Concept Linux Terminal Services Clustering Linux Terminal Services Example: University of Hamburg Feedback

4 General Concept Software components: LTSP Linux Terminal Server Project Cluster LVS Linux Virtual Server LDAP OpenLDAP

5 What are Thin/Diskless Clients? Minimal system requirements Server based computing No investment costs for clients

6 Terminal Server - Overview Centralized system settings Centralized application server Centralized security management

7 Terminal Server - relevant services DHCP: TFTP: NFS: DNS: XDMCP: LDAP: network configuration kernel transfer root-filesystem name to ip mapping remote display centralized system settings

8 Concept of Clustering LT-Server : LDAP Information (LDAP attributes) Services (DHCP, LTS..) Storage (NAS) Information (LDAP)

9 Concept of Clustering LT-Server : LVS

10 Concept of Clustering LT-Server : Overview

11 Technical Implementation LTSP: Root_NFS with LDAP aware startup script for the clients OpenLDAP: LTSP Schema extension LVS: Load Balancing and redundancy

12 Technical Implementation Ldirectord: Monitoring service availability. Modifying the LVS kernel table entries in case of services crash. Heartbeat: active stand-by for the directors

13 Technical Implementation Ldirectord.cf example for XDMCP:

14 LTSP and LDAP The LDAP holds all information concerning the client configuration (e.g. monitor resolution etc.) The standard configuration startup script is replaced by another one querying the LDAP server instead of a config file

15 LTSP and LDAP

16 LTS at the University of Hamburg 2003: LTS for 100 diskless Linux clients 2005: LTS Cluster System for 250 clients 2006: LTS Cluster System for 550 clients

17 Why Terminal Server Cluster? costs in for 250 windows clients with two AD Servers for 250 linux diskless clients with LTS Cluster at the University of Hamburg. 32 windows linux

18 Conclusion Network-centric computing with LT-Cluster: high availability lower TCO centralized system management high administration efficiency lower or even no hardware costs for clients scalability

19 Feedback Thanks for your attention! Any Questions?

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