Decentralized and Peer-to-Peer Management -- SOON: A Scalable Self-organized Overlay Network for Distributed Information Retrieval -- Dynamic Overlay Node Activation Algorithms for Large-Scale Service Deployments -- Dynamic Querying in Structured Peer-to-Peer Networks -- Web-Based Management of Content Delivery Networks -- Operations and Tools -- Crawling Bug Tracker for Semantic Bug Search -- A Runtime Constraint-Aware Solution for Automated Refinement of IT Change Plans -- SYMIAN: A Simulation Tool for the Optimization of the IT Incident Management Process -- Security and Trust -- Flexible Resolution of Authorisation Conflicts in Distributed Systems -- Trust Management for Host-Based Collaborative Intrusion Detection -- Multi-constraint Security Policies for Delegated Firewall Administration -- Measurements, Monitoring and Diagnosis -- Changes in the Web from 2000 to 2007 -- Ensuring Collective Availability in Volatile Resource Pools Via Forecasting -- Adaptive Monitoring with Dynamic Differential Tracing-Based Diagnosis -- Maintenance of Monitoring Systems Throughout Self-healing Mechanisms.

This volume of the Lecture Notes in Computer Science series contains all papers accepted for presentation at the 19th IFIP/IEEE International Workshop on Distributed Systems: Operations and Management (DSOM 2008),which was held September 25-26, 2008 on the island of Samos, Greece. DSOM 2008 was the 19th event in a series of annual workshops. It followed in the footsteps of previous s- cessful meetings, the most recent of which were held in San Jos´ e, California, USA (DSOM 2007), Dublin, Ireland (DSOM 2006), Barcelona, Spain (DSOM 2005), Davis, California, USA (DSOM 2004), Heidelberg, Germany (DSOM 2003), and Montreal, Canada (DSOM 2002). The goal of the DSOM workshops is to bring together researchers from industry and academia working in the areas of n- works, systems, and service management, to discuss recent advances and foster future growth. In contrast to the larger management conferences, such as IM (Integrated Network Management) and NOMS (Network Operations and M- agement Symposium), DSOM workshops have a single-track program in order to stimulate more intense interaction among participants. The theme of DSOM 2008 was “Managing Large-Scale Service Deployment” focusing both on management of overlay networks and on virtualized service - frastructures. The concepts of abstract overlays and virtualization constitute key contributors for e?cient large-scale service deployment and testing. Scalable - stract overlay networks accompanied with appropriate management techniques o?er ?exibility for future service deployment and consumption with high qu- ity of experience.