[ClusterLabs] Adding Tomcat as a resource to a Cluster on CentOS 7

Sean Beeson seanbeeson at gmail.com
Tue Jan 2 16:31:27 EST 2018 

Hi,

I just wanted to add the solution for future reference.

On CentOS 7 PCS starts and stops Tomcat as a systemd service named
tomcat at tomcat.service, so  a Unit file for the service in
/etc/systemd/system/ is needed. The simplest way to create that Unit file
is to do this on both the primary and secondary-- cp
/etc/systemd/system/tomcat.service
/etc/systemd/system/tomcat at tomcat.service.

Kind regards,

Sean


On Thu, Dec 7, 2017 at 3:47 AM Sean Beeson <seanbeeson at gmail.com> wrote:

> Hi, Oyvind.
>
> Thanks for that lead. I'll try it.
>
> Kind regards,
>
> Sean
>
> On Tue, Dec 5, 2017 at 6:08 PM Oyvind Albrigtsen <oalbrigt at redhat.com>
> wrote:
>
>> On 04/12/17 16:29 +0000, Sean Beeson wrote:
>> >Thank you for the replay, Oyvind. I gave it plenty of time to start up.
>> >using  tomcat_name="tomcat" it starts what I can only call a lifeless
>> PID,
>> >but it never seems to actually start up. The catalina.out file is never
>> >touched, so it never has anything in it to indicate a problem. Pacemaker
>> >does seem to be managing it though because, although this PID shows, it
>> >will report it as not running and then move everything to the other node.
>> >It will do that a couple times, but that eventually stops as well.
>> Try "pcs resource disable <resource>" and then "pcs resource
>> debug-start --full <resource>". The last command will start the
>> resource and show you which commands are run, so you can troubleshoot
>> why it's failing.
>> >
>> >Kind regards,
>> >
>> >Sean
>> >
>> >On Thu, Nov 30, 2017 at 10:40 PM Oyvind Albrigtsen <oalbrigt at redhat.com>
>> >wrote:
>> >
>> >> Tomcat can be very slow at startup depending on the modules you use,
>> >> so you can either disable modules you arent using to make it start
>> >> faster or set a higher start timeout via "pcs resource <resource> op
>> >> start interval=".
>> >>
>> >> On 30/11/17 13:26 +0000, Sean Beeson wrote:
>> >> >Hi, list.
>> >> >
>> >> >This is a pretty basic question. I have gone through what I could
>> find on
>> >> >setting up Tomcat service as a resource to a cluster, but did not find
>> >> >exactly the issue I am having. Sorry, if it has been covered before.
>> >> >
>> >> >I am attempting this on centos-release-7-4.1708.el7.centos.x86_64.
>> >> >The pcs I have installed is pcs-0.9.158-6.el7.centos.x86_64
>> >> >The resource-agents installed is
>> resource-agents-3.9.5-105.el7_4.2.x86_64
>> >> >
>> >> >I have DRBD, MySql, and a virtual IP running spectacularly well and
>> they
>> >> >failover perfectly and do exactly what I want them. I can add Tomcat
>> as a
>> >> >resource just fine, but it never starts and I can not fined anything
>> in
>> >> any
>> >> >log file that indicates why. Pcs does at some point know to check on
>> it,
>> >> >but simply says Tomcat is not running. If I run everything manually
>> on in
>> >> a
>> >> >cluster I can manually get Tomcat to start with systemctl. Here is
>> how I
>> >> am
>> >> >try to configure it.
>> >> >
>> >> >[root at centos7-ha-lab-01 ~]# pcs status
>> >> >Cluster name: ha-cluster
>> >> >Stack: corosync
>> >> >Current DC: centos7-ha-lab-02-cr (version 1.1.16-12.el7_4.4-94ff4df) -
>> >> >partition with quorum
>> >> >Last updated: Thu Nov 30 21:03:36 2017
>> >> >Last change: Thu Nov 30 20:53:37 2017 by root via cibadmin on
>> >> >centos7-ha-lab-01-cr
>> >> >
>> >> >2 nodes configured
>> >> >6 resources configured
>> >> >
>> >> >Online: [ centos7-ha-lab-01-cr centos7-ha-lab-02-cr ]
>> >> >
>> >> >Full list of resources:
>> >> >
>> >> > Master/Slave Set: DRBD_data_clone [DRBD_data]
>> >> >     Masters: [ centos7-ha-lab-01-cr ]
>> >> >     Slaves: [ centos7-ha-lab-02-cr ]
>> >> > fsDRBD_data    (ocf::heartbeat:Filesystem):    Started
>> >> centos7-ha-lab-01-cr
>> >> > OuterDB_Service    (systemd:mysqld):    Started centos7-ha-lab-01-cr
>> >> > OuterDB_VIP    (ocf::heartbeat:IPaddr2):    Started
>> centos7-ha-lab-01-cr
>> >> > tomcat_OuterWeb    (ocf::heartbeat:tomcat):    Stopped
>> >> >
>> >> >Failed Actions:
>> >> >* tomcat_OuterWeb_start_0 on centos7-ha-lab-01-cr 'unknown error' (1):
>> >> >call=67, status=Timed Out, exitreason='none',
>> >> >    last-rc-change='Thu Nov 30 20:56:22 2017', queued=0ms,
>> exec=180003ms
>> >> >* tomcat_OuterWeb_start_0 on centos7-ha-lab-02-cr 'unknown error' (1):
>> >> >call=57, status=Timed Out, exitreason='none',
>> >> >    last-rc-change='Thu Nov 30 20:53:23 2017', queued=0ms,
>> exec=180003ms
>> >> >
>> >> >Daemon Status:
>> >> >  corosync: active/enabled
>> >> >  pacemaker: active/enabled
>> >> >  pcsd: active/enabled
>> >> >
>> >> >I have tried with and without tomcat_name=tomcat_OuterWeb and tomcat
>> and
>> >> >root for tomcat_user=. Neither work.
>> >> >
>> >> >Here is the command I am using to add it.
>> >> >
>> >> >pcs resource create tomcat_OuterWeb ocf:heartbeat:tomcat
>> >> >java_home="/opt/java/jre1.7.0_80" catalina_home="/opt/tomcat7"
>> >> >catalina_opts="-Dbuild.compiler.emacs=true -Dfile.encoding=UTF-8
>> >> >-Djava.util.logging.config.file=/opt/tomcat7/conf/log4j.properties
>> >> >-Dlog4j.configuration=file:/opt/tomcat7/conf/log4j.properties
>> -Xms1024m
>> >> >-Xmx1024m -XX:PermSize=256m -XX:MaxPermSize=512m" tomcat_user="root"
>> op
>> >> >monitor interval="15s" op start timeout="180s"
>> >> >
>> >> >I have tried also the most basic.
>> >> >pcs resource create tomcat_OuterWeb ocf:heartbeat:tomcat
>> >> >java_home="/opt/java/jre1.7.0_80" catalina_home="/opt/tomcat7"
>> >> >tomcat_name="tomcat_OuterWeb" tomcat_user="root" op monitor
>> interval="15s"
>> >> >op start timeout="180s"
>> >> >
>> >> >I other examples I have seen they usually use params then the options
>> in
>> >> >these command to add Tomcat as a resource, but when  I use that it
>> tells
>> >> me
>> >> >that is an unrecognized option and it then accepts the options
>> without it
>> >> >just fine. I was led to think this was a difference in version of the
>> >> >resource-agents perhaps.
>> >> >
>> >> >Any idea why I can not get Tomcat to start or some lead to the
>> logging I
>> >> >could look at to understand why it is failing would be great. Nothing
>> >> shows
>> >> >in messages, catalina.out, pcsd.log, nor the resource
>> >> >log--tomcat_OuterWeb.log. However, it does make the resource log, but
>> it
>> >> >only has this in it, which seems to be false:
>> >> >
>> >> >2017/11/30 20:50:22: start ===========================
>> >> >2017/11/30 20:53:22: stop  ###########################
>> >> >2017/11/30 20:56:22: start ===========================
>> >> >2017/11/30 20:59:22: stop  ###########################
>> >> >
>> >> >The only other thing is: * tomcat_OuterWeb_start_0 on
>> centos7-ha-lab-01-cr
>> >> >'unknown error' (1): call=67, status=Timed Out, exitreason='none',
>> >> >
>> >> >Again, any ideas would be appreciated. Thank you.
>> >> >
>> >> >Kind regards,
>> >> >
>> >> >Sean
>> >>
>> >> >_______________________________________________
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