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From Daniel Mikusa <dmik...@pivotal.io>
Subject Re: Multiple instances?
Date Wed, 10 Dec 2014 17:10:02 GMT
On Wed, Dec 10, 2014 at 10:35 AM, Billy Bones <gael.therond@gmail.com>
wrote:

> Hi Christopher,
>
> Many thanks for your answer, well, I'm pretty comfortable with systemd
> myself as I rely on it for my Fedora box for a long time ago, but on this
> particular topic regarding tomcat, I don't really understand the purpose of
> this special sentence.
> As you pointed it, for me too usually caps names == env variables but as on
> the tomcat-sysd script it's simply called without futher sources I'm not
> quite sure for now.
>
> Well, lets see if another *NIX Admin already had started multi-instances
> tomcat on systemd distributions :D
>

Starting different instances of Tomcat is mostly just a matter of setting
the CATALINA_HOME and CATALINA_BASE environment variables to the right
locations.  I'm sure systemd has a way for you to set environment
variables, so that should be sufficient to start different instances.

For more details on CATALINA_HOME and CATALINA_BASE, check out the
RUNNING.txt file in your download or look here.

  http://svn.apache.org/viewvc/tomcat/tc7.0.x/trunk/RUNNING.txt?view=markup

I'd suggest getting everything working with multiple instance first.  Once
you can start the instances from the command line then worry about starting
them with systemd.


>
> Another way would be to completly duplicate the tomcat directory and
> service unit and start both at runtime but... doesn't seems too shiny for a
> new server :D
>

Also an option, but not as efficient.

Dan


>
> 2014-12-10 16:27 GMT+01:00 Christopher Schultz <
> chris@christopherschultz.net
> >:
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA256
> >
> > Billy,
> >
> > On 12/10/14 9:57 AM, Billy Bones wrote:
> > > Hi guys,
> > >
> > > I'm currently preparing a migration of our Operating System which
> > > handle our current tomcat installation from an OLD Linux using init
> > > scripts to a CentOS7 release using sytemd.
> >
> > Hrm. Good luck getting help with systemd. The ASF doesn't even support
> > init.d scripts, though I'm sure many *NIX admins here can help with
> > init.d scripts (including myself). systemd is a bit new, to ... we'll
> see.
> >
> > > Because I don't want to disturb the way the old server handle the
> > > webapps (not yet :-) ), I have to start 2 separated instances of
> > > tomcat on the new machine.
> > >
> > > Using init script to boot multiples instance is quite easy, but
> > > know I'll use systemd and I have to adapt.
> > >
> > > I installed my OS and Tomcat from the CentOS repos, take a look at
> > > the tomcat.service unit and tomcat-sysd script to see how the
> > > things work. But now I'm a little bit disappointed, I don't
> > > understand how to have multiple instances.
> > >
> > > I created a tomcat@jcr.service unit file on my systemd directory
> > > and read about the steps to achieve.
> > >
> > > The first step said that *"by default SERVICE_NAME=tomcat. and must
> > > be defined BEFORE tomcat-sysd is called"*
> > >
> > > Well, OK, but how am I suppose to do that? Using environnement
> > > variables? PreStartExec directive? Environnement directive?
> >
> > I have no idea. Generally, whenever I see something in ALL_CAPS that
> > needs to be set to a value, it's an environment variable. With
> > systemd, it could mean just about anything.
> >
> > > I really don't get it, even looking at the tomcat-sysd wrapper
> > > script which indicate me HOW the system run multiple instance don't
> > > help me to understand WHERE am I suppose to put that information.
> > >
> > > I understand that I have to create a new unit file, a new
> > > /etc/sysconfig/tomcat file named according to the systemd unit, but
> > > I don't get it about the SERVICE_NAME.
> > >
> > > So if someone could help me a little bit, I'll be happy ^^
> >
> > Ultimately, it will all boil down to CATALINA_BASE and CATALINA_HOME
> > as far as Tomcat is concerned. The SERVICE_NAME is probably a
> > systemd-only thing.
> >
> > Good luck,
> > - -chris
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> >
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