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 CENTOS
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, default "root")
statusurl
URL for state confirmation.
(optional, string, no default)
max_stop_time
Number of seconds to wait during a stop before drastic measures (force kill) are used on the tomcat process. This number MUST be less
than your cluster stop timeout for the resource. The default value is five seconds before the timeout value of stop operation. When it
is over this value, it stops a process in kill commands. This parameter is only effective on Tomcat 6 or later.
(optional, integer, 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.
(required, string, no default)
catalina_base
Instance directory of Tomcat
(unique, optional, string, no default)
catalina_out
Log file name of Tomcat
(unique, optional, string, no default)
catalina_pid
A PID file name for Tomcat.
(unique, optional, string, no default)
tomcat_start_script
Absolute path to the custom tomcat start script to use.
(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_tmpdir
Temporary directory of Tomcat
(unique, optional, string, no default)
catalina_rotate_log
Rotate catalina.out flag.
(optional, boolean, default NO)
catalina_rotatetime
catalina.out rotation interval (seconds).
(optional, integer, no default)
java_endorsed_dirs
Java_endorsed_dirs of tomcat
(unique, optional, string, no default)
logging_config
Logging_config of tomcat
(unique, optional, string, no default)
logging_manager
Logging_manager of tomcat
(unique, optional, string, 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 06/09/2014 OCF_HEARTBEAT_TOMCAT(7)