[CentOS] can't get Tomcat5 to work on centos 5.1, how do I get it to work?
Rudi Ahlers
Rudi at SoftDux.com
Fri May 9 13:06:14 UTC 2008
----- Message from lesmikesell at gmail.com ---------
Date: Fri, 09 May 2008 07:54:42 -0500
From: Les Mikesell <lesmikesell at gmail.com>
Reply-To: CentOS mailing list <centos at centos.org>
Subject: Re: [CentOS] can't get Tomcat5 to work on centos 5.1, how
do I get it to work?
To: CentOS mailing list <centos at centos.org>
> Rudi Ahlers wrote:
>> Filipe Brandenburger wrote:
>>> Hi,
>>>
>>> On Thu, May 8, 2008 at 6:00 PM, Rudi Ahlers <Rudi at softdux.com> wrote:
>>>
>>>> Exception in thread "main" java.lang.OutOfMemoryError: Cannot create
>>>>
>>>
>>> It looks like it's running out of memory when starting more threads.
>>> Did you check if you have enough memory in this server to run Tomcat?
>>> I think you need at least 512MB for it, but I would recommend more.
>>>
>>> I know there are some tunings made to the JVM for it to request more
>>> memory. If you do "ps -ef | grep java" when Tomcat is started you will
>>> see some parameters starting with -X that will specify memory sizes,
>>> check how much it requests. I don't really know how to tweak those,
>>> check the script that starts Tomcat to see if it allows changing them.
>>>
>
>>
>>
>> What you're saying could be true, but I don't think it's the case.
>>
>> I have confirmed with the client, and he says that 128MB RAM would
>> be enough for his app.
>
> The default config is probably asking for more than that.
>
>
>> [root at vps06 /]# /etc/init.d/tomcat5 restart
>> Starting tomcat5: [ OK ]
>> [root at vps06 /]# ps -ef | grep java
>> tomcat 13918 1 62 02:40 ? 00:00:02
>> /usr/lib/jvm/java/bin/java
>> -Dcatalina.ext.dirs=/usr/share/tomcat5/shared/lib:/usr/share/tomcat5/common/lib -Dcatalina.ext.dirs=/usr/share/tomcat5/shared/lib:/usr/share/tomcat5/common/lib -Djava.endorsed.dirs=/usr/share/tomcat5/common/endorsed -classpath /usr/lib/jvm/java/lib/tools.jar:/usr/share/tomcat5/bin/bootstrap.jar:/usr/share/tomcat5/bin/commons-logging-api.jar:/usr/share/java/mx4j/mx4j-impl.jar:/usr/share/java/mx4j/mx4j-jmx.jar -Dcatalina.base=/usr/share/tomcat5 -Dcatalina.home=/usr/share/tomcat5 -Djava.io.tmpdir=/usr/share/tomcat5/temp org.apache.catalina.startup.Bootstrap
>> start
>>
>> [root at vps06 /]# ps -ef | grep java
>> root 14011 12038 0 02:40 pts/0 00:00:00 grep java
>> [root at vps06 /]# free -m
>> total used free shared buffers cached
>> Mem: 256 20 235 0 0 0
>> -/+ buffers/cache: 20 235
>>
>>
>> As you can see, the first time I ran "ps -ef | grep java" I could
>> see that it's starting up, but the second time, it's not running
>>
>> I have another terminal open with top running, and the memory usage
>> didn't even blink when I ran it
>
> What jvm are you running? Chances are that you will have to install
> the Sun version to run the app(s) so you might want to do that before
> much other troubleshooting.
>
>
> --
> Les Mikesell
> lesmikesell at gmail.com
> _______________________________________________
Yea, I have upped the RAM to 1024MB, and it's working now.
Is this what you're looking for?
[root at vps06 ~]# java -version
java version "1.4.2"
gij (GNU libgcj) version 4.1.2 20070626 (Red Hat 4.1.2-14)
How / where does one optimize java's usage?
output from top:
top - 09:05:42 up 1:59, 1 user, load average: 0.02, 0.02, 0.00
Tasks: 30 total, 1 running, 29 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1048576k total, 799828k used, 248748k free, 0k buffers
Swap: 0k total, 0k used, 0k free, 0k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
15908 tomcat 15 0 595m 134m 35m S 0 13.1 0:28.89 java
5506 mysql 18 0 133m 18m 3992 S 0 1.8 0:00.08 mysqld
14282 root 18 0 7440 5420 1600 S 0 0.5 0:00.01 miniserv.pl
10132 root 18 0 9144 2884 2200 S 0 0.3 0:00.09 sshd
19532 root 18 0 10428 2832 1388 S 0 0.3 0:00.00 httpd
3674 named 25 0 68504 2752 1756 S 0 0.3 0:00.00 named
19533 apache 25 0 10428 2096 628 S 0 0.2 0:00.00 httpd
19535 apache 25 0 10428 2096 628 S 0 0.2 0:00.00 httpd
19536 apache 25 0 10428 2096 628 S 0 0.2 0:00.00 httpd
19537 apache 25 0 10428 2096 628 S 0 0.2 0:00.00 httpd
19538 apache 25 0 10428 2096 628 S 0 0.2 0:00.00 httpd
19539 apache 25 0 10428 2096 628 S 0 0.2 0:00.00 httpd
19540 apache 25 0 10428 2096 628 S 0 0.2 0:00.00 httpd
19541 apache 25 0 10428 2096 628 S 0 0.2 0:00.00 httpd
11791 postfix 18 0 6820 1868 1496 S 0 0.2 0:00.00 qmgr
11789 root 18 0 6700 1768 1408 S 0 0.2 0:00.01 master
12080 postfix 18 0 6768 1760 1416 S 0 0.2 0:00.00 pickup
25774 root 15 0 2420 1312 1092 S 0 0.1 0:00.02 bash
11784 root 18 0 2420 1308 1088 S 0 0.1 0:00.03 bash
1985 root 17 0 2424 1304 1084 S 0 0.1 0:00.17 bash
5470 root 22 0 2416 1128 964 S 0 0.1 0:00.00 mysqld_safe
3376 root 18 0 3184 1104 576 S 0 0.1 0:00.00 crond
7548 root 18 0 6148 1036 668 S 0 0.1 0:00.00 sshd
10122 root 18 0 2172 1028 824 R 0 0.1 0:00.49 top
3326 root 20 0 2684 856 684 S 0 0.1 0:00.00 xinetd
1 root 15 0 2040 656 564 S 0 0.1 0:00.35 init
3297 root 18 0 1700 580 484 S 0 0.1 0:00.00 syslogd
11908 root 18 0 1664 440 368 S 0 0.0 0:00.00 tail
1980 root 15 0 1868 436 336 S 0 0.0 0:00.28 vzctl
25773 root 17 0 1872 316 216 S 0 0.0 0:00.00 vzctl
--
Kind Regards
Rudi Ahlers
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