ulimits and my limits
- May
- 24
- Posted by TKH Specialist
- Posted in Analysis, java, linux, Oracle, System Administration, System Resources
Even Linux systems have their limits! One of the systems I manage started throwing a “Too many open files” error in /var/log/messages. No error is good but this error is fixable. A little tuning and the error goes away. On this particular server we were running the Oracle Client and a Java Application, two very […]
read moreWhen Tomcat stops responding to Apache
- Sep
- 18
- Posted by TKH Specialist
- Posted in apache, Kuali, tomcat
Today our multi-node tomcat servers became unresponsive to user/web traffic. A quick look at our monitoring tools indicated that the tomcat servers were running healthily. While the application administrator looked at catalina.out to see if we were missing something, I dug into the load balancer logs. I immediately saw the following errors: [Date] [error] ajp_read_header: […]
read morePutting ‘lsof’ to use
- Apr
- 19
- Posted by TKH Specialist
- Posted in redhat, Security, System Administration
- 3
lsof is a powerful tool that has proven very userful over the years in troubleshooting and forensic investigations. Here are some useful lsof command examples: In this example we are looking at all the files a given process has open (pid=1655 here this is the zabbix agent) lsof -p 1767 Note you can clean up […]
read moreSplunk Installation
- Feb
- 13
- Posted by TKH Specialist
- Posted in History, Logging, System Administration
Fairly short and sweet to get the agent installed; details are below. 1) Install the appropriate package from a designated and trusted source: 2) The default installation path, ${INSTALL_PATH} = /opt/splunkforwarder 3) Next, create a file with the path /opt/splunkforwarder/etc/system/local/deploymentclient.conf with the contents: [deployment-client] [target-broker:deploymentServer] targetUri = splunkdeploy.uits.uconn.edu:8089 4) Run the following (supplying your own […]
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