Reload applications multiple instances in cluster

Question

Apologies if this in another post but could not find
anything.
I am looking for strategies to reload app vars across
instances in a cluster.
Any suggestions?
thanks,
Mike

Answer 1

Grizzly9279 wrote:
> Say you have a web server, let's call it "WEB1". WEB1
could be hosting IIS,
> Apache, etc. It doesn't really matter.
Let's say IIS with a wwwroot at c:\inetpub\wwwroot. So the
index.cfm of
the application is located at c:\inetpub\wwwroot\index.cfm
> Now let's say you have two CF application servers, let's
call them "APP1", and
> "APP2". Each application server hosts 2 CF instances. So
APP1 has two CF
> instances on port 8301 and 8302. APP2 has two CF
instances on port 8303 and
> 8304.
Ans each of those instances has its own webroot at the root
dir of the
CF WAR file, which is (in UNC notation):
\\APP1\c$\JRun4\servers\instance1\cfusion.ear\cfusion.war\
\\APP1\c$\JRun4\servers\instance2\cfusion.ear\cfusion.war\
\\APP2\c$\JRun4\servers\instance1\cfusion.ear\cfusion.war\
\\APP2\c$\JRun4\servers\instance2\cfusion.ear\cfusion.war\
> "Normal" requests to the site are sent to WEB1, which in
turn forwards CFM
> requests to the CF cluster, which could fall on any one
of 4 possible CF
> instances (8301, 8302, 8303, and 8304).
Correct.
> Under this schema, you can make DIRECT requests to the
application on the
> internal network as follows:
> -
http://app1:8301/
> -
http://app1:8302/
> -
http://app2:8303/
> -
http://app2:8304/
You can make requests to those locations indeed. And they
will arrive at
the internal JRun server. And the internal JRun server will
resolve them
relative to its own webroot, not relative to the IIS webroot.
To get this to work, you have several options:
- make the JRun webroot equal to the IIS webroot (change its
location in
the xml config file);
- place a bootstrap file in each JRun webroot that call the
application
through cfmodule / cfinvoke / cfinclude;
- switch on sticky sessions in your cluster and include a
jsessionid in
your http request that is specific to the instance you want
to hit
(first 4 characters of the jsessionid equal to the serv
er.if).
> Does that make sense? Is there something particularly
exotic or unique about
> your current infrastructure that prevents you from
individually referencing
> each cluster instance internally?
Nothing exothic. In fact, I would say that the majority of
the clusters
have a JRun webroot that is not the same as the IIS / Apache
webroot.
Jochem
Jochem van Dieten
Adobe Community Expert for ColdFusion