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From: Neill Lima <neill.lima@visual-meta.com>
Date: Thu, 3 Dec 2015 09:31:55 +0100
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 <CAPGYHbs4EQ=0aWJa+M0PcnW=ySA3aj5BDVG28=n8w6FsuMopJw@mail.gmail.com>
Subject: Re: Zero downtime deployments
To: Tomcat Users List <users@tomcat.apache.org>
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Hello Jason,

This approach of using httpd in front of 2+ Tomcats via AJP works well in
my company. There is a bit of config necessary at httpd level so httpd is
aware of all the Tomcats and also Tomcat config needs to be set to listen
to AJP port instead of default port but it is not rocket science.

This facilitates the deployment of nodes sequentially with no downtime. Of
course, there is a shared session server to take care the sessions are not
lost when Tomcats flip up and down.

Reply in pvt if you need help setting up this.

Thanks,

Neill

On Thu, Dec 3, 2015 at 12:08 AM, Jason Britton <jbritton31@gmail.com> wrote:

> Thank you Christopher, reading now and we'll see if I can swing the
> conference :)
>
> On Wed, Dec 2, 2015 at 4:00 PM, Christopher Schultz <
> chris@christopherschultz.net> wrote:
>
> > Jason,
> >
> > On 12/2/15 4:07 PM, Jason Britton wrote:
> > > I was looking for information for how those on the list achieve zero
> > > downtime deployments of their tomcat hosted web applications.  I
> imagine
> > > this can be achieved in a variety of ways, but would love to hear what
> > > works for you.  In our current environment we front multiple tomcat
> > > instances with apache httpd, each tomcat instance hosting one or more
> > > unique web apps.  In order to support this effort we do have the
> > resources
> > > where we could spin up multiple tomcat instances to serve requests for
> a
> > > single application.  I know there is mod_proxy_balancer available for
> > > httpd, and I understand starting with tomcat 7 there is support for
> > > parallel deployment of versioned wars, and tomcat also supports
> > > clustering.  I'm just unsure of what approach I should start digging
> into
> > > and would very much appreciate any of your experiences.  The servers
> > we'll
> > > be rolling out will be using the latest versions of tomcat 8 and apache
> > > httpd 2.4.  Thanks for any insights!
> >
> > Check this out:
> >
> >
> http://people.apache.org/~schultz/ApacheCon%20NA%202015/Load-balancing%20Tomcat%20with%20mod_jk.pdf
> >
> > Start on slide/page 41.
> >
> > Then come to ApacheCon NA 2016 and discuss it!
> >
> > -chris
> >
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>

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