LHCb Online Log Analysis and Maintenance System
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1 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 1 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 13 October 2011
2 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 2 Introduction Writing every line of log of the LHCb Online Cluster in a central place 2000 Linux machines Event Filter Farm and other data acquisition systems User nodes Storage 200 Windows machines Experiment Control System device drivers Domain Controllers Numerous services 60 switches and routers O(10000) log sources
3 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 3 Outline 1 Central Logging System 2 Analysis 3 Results
4 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 4 Outline 1 Central Logging System 2 Analysis 3 Results
5 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 5 Requirements Usual requirements: Reliable Available Scalable Fault tolerant Standard -> use well known open source tools Cheap Analysis Fast Logs provide complementary information to snmp Efficient alert system Distribution to users for custom analysis Read only
6 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 6 Log servers Linux based system O(10000) sources for 8 severities and 22 syslog facilities Use Rsyslog Rules can contain regular expressions About 100 rules to write files Push files to syslog protocol Keeping logs for a few months Using standard logrotate Compression ratio: 1/200 Security relevant logs are kept longer Distribute log as a file system hierarchy via NFS and Samba
7 Architecture Figure: Third version of the cluster using Pacemaker and Corosync Switch: Single point of failure Cheap storage solution LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 7
8 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 8 Log clients Syslog over UDP for most of the sources Linux systems and most of the application Windows Event logs using Snare Files using the rsyslog module imfile or Epilog on Windows; e.g. PVSS. Network devices Legacy custom log protocol for Data Acquisition software Over TCP/IP Cannot be distributed over the cluster
9 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 9 Outline 1 Central Logging System 2 Analysis 3 Results
10 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 10 OSSEC Host based Intrusion Detection System Limited use yet: log analysis Log digest Alerts Active responses Hierarchical rule set to improve analysis time Attack signature Problems in data acquisition Router Line card crash -> Get all information for the tech support Running on the exported file system Single node
11 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 11 OSSEC rules Figure: web log analysis
12 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 12 Outline 1 Central Logging System 2 Analysis 3 Results
13 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 13 Network usage Figure: For one node serving NFS in parallel
14 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 14 Split brain recovery Figure: 2 hour recovery, all IO spent reading the disk
15 LHCb Online Log Analysis and Maintenance System Jean-Christophe Garnier 15 Conclusion Third version of the system in production for about one month Final version stores currently 400 GB of logs Alarms about most of important issues in our system, good complement to Icinga Work in progress Issue with rsyslog multi-threads multi-queues, take the time to contribute Implement more analysis and active responses in OSSEC
16
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