02-27-2020
Application showing "Connection Time Out" very often
Hi,
We have a web serveer running on Apache-Tomcat-6.0.32. For 2 months continuously, we noticed that the app on this server setup has been frequently sending out intermittent "Connection Time Out" issues.
On the OS side, I investigated a lot of things,
1) tcpdump : did not find anything suspicious (no large flooding of suspicious IP, etc)
2) In the apache access_log nothing suspicious either.
3) netstat -an, tulpn : No timeout/dead connection
4) telnet to port 80 is OK
Thus, my teammate concluded that it could be a bug in the tomcat version 6.0.32 itself. Is this possible/true? How can we confirm this?
We use "Uptime" as a monitoring tool, and it sends updates every 3 mins. Whereas other monitoring tools send alerts every 5 mins or more, and do not show the "Connection Time Out" problem.
Is "Uptime" an unstable monitoring tool?
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LEARN ABOUT DEBIAN
ocf_heartbeat_tomcat
OCF_HEARTBEAT_TOMCAT(7) OCF resource agents OCF_HEARTBEAT_TOMCAT(7)
NAME
ocf_heartbeat_tomcat - Manages a Tomcat servlet environment instance
SYNOPSIS
tomcat [start | stop | status | monitor | meta-data | validate-all]
DESCRIPTION
Resource script for Tomcat. It manages a Tomcat instance as a cluster resource.
SUPPORTED PARAMETERS
tomcat_name
The name of the resource, added as a Java parameter in JAVA_OPTS: -Dname=<tomcat_name> to Tomcat process on start. Used to ensure
process is still running and must be unique. (unique, optional, string, no default)
script_log
Log file, used during start and stop operations. (unique, optional, string, no default)
tomcat_stop_timeout
Time-out for stop operation. DEPRECATED (optional, integer, no default)
tomcat_suspend_trialcount
Maximum number of times to retry stop operation before suspending and killing Tomcat. DEPRECATED. Does not retry. (optional, integer,
no default)
tomcat_user
The user who starts Tomcat. (optional, string, no default)
statusurl
URL for state confirmation. (optional, string, no default)
java_home
Home directory of Java. (required, string, no default)
java_opts
Java JVM options used on start and stop. (optional, string, no default)
catalina_home
Home directory of Tomcat. (unique, required, string, no default)
catalina_base
Instance directory of Tomcat (unique, optional, string, no default)
catalina_pid
A PID file name for Tomcat. (unique, optional, string, no default)
tomcat_start_opts
Tomcat start options. (optional, string, no default)
catalina_opts
Catalina options, for the start operation only. (optional, string, no default)
catalina_rotate_log
Rotate catalina.out flag. (optional, string, no default)
catalina_rotatetime
catalina.out rotation interval (seconds). (optional, integer, no default)
SUPPORTED ACTIONS
This resource agent supports the following actions (operations):
start
Starts the resource. Suggested minimum timeout: 60s.
stop
Stops the resource. Suggested minimum timeout: 120s.
status
Performs a status check. Suggested minimum timeout: 60.
monitor
Performs a detailed status check. Suggested minimum timeout: 30s. Suggested interval: 10s.
meta-data
Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5s.
validate-all
Performs a validation of the resource configuration. Suggested minimum timeout: 5.
EXAMPLE
The following is an example configuration for a tomcat resource using the crm(8) shell:
primitive p_tomcat ocf:heartbeat:tomcat
params
java_home=string
catalina_home=string
op monitor depth="0" timeout="30s" interval="10s"
SEE ALSO
http://www.linux-ha.org/wiki/tomcat_(resource_agent)
AUTHOR
Linux-HA contributors (see the resource agent source for information about individual authors)
resource-agents UNKNOWN 03/09/2014 OCF_HEARTBEAT_TOMCAT(7)