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From Jason Dillon <ja...@planet57.com>
Subject Re: New GShell-based Geronimo Server launcher now in server/trunk
Date Sat, 08 Sep 2007 19:40:59 GMT
A little bit more insight into what I'm thinking of doing... since  
some of you can't read minds to well :-P

I'd like to convert all of the assemblies to basically look like what  
the assemblies/geronimo-jetty6-javaee5-gshell produces.

And then I'd like to start converting the other cli bits to gshell  
command impls, like: deployer, client and shutdown.

And then (maybe around the same time or before the above), I'd like  
to adapt the gshell of target jvm bits to load jars from the  
repository, instead of using the lib/* bits.

A little background for those who haven't looked at assemblies/ 
geronimo-jetty6-javaee5-gshell and what it produces from a lib/*  
perspective.  Right now I've set up the assembly to produce:

     geronimo-jetty6-javaee5-gshell-2.1-SNAPSHOT/lib
     geronimo-jetty6-javaee5-gshell-2.1-SNAPSHOT/lib/boot
     geronimo-jetty6-javaee5-gshell-2.1-SNAPSHOT/lib/endorsed
     geronimo-jetty6-javaee5-gshell-2.1-SNAPSHOT/lib/gshell

Where the bits in lib/* and lib/endorsed/* are the same as they were  
before.  The bits in lib/boot/* and lib/gshell/* are specific to  
gshell.  And normally a gshell installation would have everything I  
put into lib/gshell/* into lib/*, but I moved them to a sub dir for  
now... since the bin/*.jar's load jars from the ../lib/* dirs.

The lib/boot/* stuff is the very minimal gshell bootstrap classes,  
which setup up the other happiness... and let you do things like:

     java -jar ./geronimo-jetty6-javaee5-gshell-2.1-SNAPSHOT/lib/boot/ 
gshell-bootstrap.jar

And that will give you a nice shell... or

     java -jar ./geronimo-jetty6-javaee5-gshell-2.1-SNAPSHOT/lib/boot/ 
gshell-bootstrap.jar start-server

That will launch the G server process using all of the right - 
Djava.ext.dirs and whatever properties that we currently have hacked  
into platform scripts.

Anyways, so the idea is to move all of the bits which are current in  
the lib/* into the repository, and then configure the gshell command  
impl to load put the correct dependency artifacts onto the classpath  
of the target jvm that is booted up.  This will augment the existing  
kernel bootstrap from repo stuff, putting evertying except what is  
needed from gshell into the repository...

And really, what I'd like to eventually get to is having the  
bootstrap from the repository... so that everything except for what  
is now it lib/boot/* and lib/endorsed/* can live in the repository  
like happy little communistic jars should be :-P

  * * *

And then there are longer term things for GShell...

Remote administration (via, telnet, ssh, or custom ssl protocol...  
last is most likely to actually happen soonish)

Process management, which is great for clusters, or staging ->  
production management.  A full suite of command-line tools which can  
manage the configuration of a server... easily.  So, for example,  
lets say you've got a configuration that is working really well for  
you... but you want to play with something new...

So you might:

     ./bin/gsh backup-configuration before-mucking
     ./bin/gsh start-server

And then go and change a whole bunch of stuff...  and it doesn't  
work... yikes... so rollback...

     ./bin/gsh backup-configuration hosed-server
     ./bin/gsh restore-configuration before-mucking
     ./bin/gsh start-server

And then maybe you want to play with the "hosed-server" configuration  
again...

     ./bin/gsh start-server --configuration hosed-server

Of course, all of these could have been run from a single ./bin/gsh,  
but just for clarity, you can run them one off too.

Maybe list or mange the configurations

     ./bin/gsh list-configurations
     ./bin/gsh remove-configuration some-unwanted-config
     ./bin/gsh copy-configuration default some-new-config

The sky is the limit really... for what kind of management we can do...

Lets say you wanted to do the above on a remote node?

     ./bin/gsh remote-shell someserver:9443
     Connecting to someserver:9447...
     Connected

     username: system
     password: **** (remember this is all jline, so we can mask  
passwords like one woudl expect)

     someserver:9447 > list-configurations
     someserver:9447 > remove-configuration some-unwanted-config
     someserver:9447 > copy-configuration default some-new-config

So, all of these operations would happen on the node named  
"someserver" listening on 9443 (over ssl of course).  Or how about  
you want to reboot a server remotely?

     someserver:9447 > restart-server now
     Geronimo server shutting down...
     ....
     Geronimo server shutdown.
     Geronimo server starting...
     ...
     Geronimo server started in ...

Since GShell manages the processes its really easy to perform a full  
restart of a Server w/o needing magical platform scripting muck.  And  
it will just work the same on each platform too.

Once we have clustering, then we can do the same kinda thing for an  
entire cluster of nodes...

     someserver:9447 > restart-cluster now
     Shutting down 2 nodes...
     <node1> Geronimo server shutting down...
     <node1>....
     <node2> Geronimo server shutting down...
     <node2>....
     <node1>Geronimo server shutdown.
     <node2>Geronimo server shutdown.
     Starting up 2 nodes...
     <node1>Geronimo server starting...
     <node1>..
     <node2>Geronimo server starting...
     <node2>..
     <node1>Geronimo server started in ...
     <node2>Geronimo server started in ...
     Started up 2 nodes.

And well, if you had some kinda script file which controlled say a  
logical grouping of nodes you could easily invoke that script (ya  
even on a remote system) and it will go and do it:

someserver:9447 > script -l groovy local:file://restart- 
universe.groovy qa-universe

The local: bit of the uri siginals the local URL handler to be used,  
which will cause the file://restart-universe.groovy to be loaded from  
the gsh instance where you are actually logged into (and ran the  
remote-shell gshell command) and will pipe its contents securely to  
the remote shell running on someserver:9447 and pass it to the script  
command to execute.

The restart-universe.groovy might look something like this:

<snip>
import universe.Lookup

assert args.size == 1 : 'Missing universe name'

def universe = args[0]

// Look up a list of nodes (for now say they are basically  
hostname:port)
def nodes = Lookup.lookup(universe)

log.info("Stopping universe ${universe}...")
nodes.each { host ->
	shell.execute("remove-shell $host stop-server")		
}
log.info("Universe ${universe} stopped")

log.info("Starting universe ${universe}...")
nodes.each { host ->
	shell.execute("remove-shell $host start-server")		
}
log.info("Universe ${universe} started")
</snip>

Its kinda crude script, but I think you get the general point...

  * * *

Anyways... I see... well, *HUGE* potential for this stuff...

And really, a lot of what I just described above isn't that far into  
fantasy, its all relatively easy to implement on top of GShell... as  
it is now (or really as it was a year+ ago when I wrote it).  Its  
really a matter of do others see the same value... and do others see  
the vision of using GShell as the core process launcher to allow  
things like "restart-server", or a "stop-server; copy-configuration  
default known-good; copy-configuration default testing; start- 
server", or that uber-fancy remote-shell muck.

So, I'm gonna give y'all a few days to grok (or try to) what I've  
just spit out... please ask questions or comment, as I like to know  
I'm not just talking to myself here.

And then maybe later next week, we might vote or come to some other  
consensus that this is the right direction for Geronimo, and well...  
then I'll make it become reality.

Aighty, and now I'll shut up :-P

--jason



On Sep 8, 2007, at 11:53 AM, Jason Dillon wrote:

> Aighty, well... I've done some long awaited re-factoring, and while  
> its still not _perfect_ its a whole lot better now IMO  I think  
> from a framework perspective that its probably mature enough to  
> take on the task of being the server bootloader.
>
> I'm going to continue to refactor the guts of GShell over time, of  
> course... but I think that what is there now is highly usable for a  
> simple platform independent launcher, as well as for porting over  
> the other cli bits we have.
>
> I've done a lot of work in the past week, incase you didn't see the  
> storm of scm messages... pulled out pico, plopped in plexus, pulled  
> out commons-logging and commons-lang, which are suck and boated (in  
> that order).  I've gotten the basic framework and supported classes  
> to use GShell down to ~ 1mb (a wee bit under)... though when I  
> started to add the layout.xml abstraction stuff, I had to pull in  
> xstream which bloated her back up to ~1.4m.  I may eventually fix  
> that... or not, cause xstream is soooo very handy for xml -> object  
> stuff.
>
> I've fallen in love with annotations... they are *ucking great.   
> They work really well for handling the cli option and argument muck  
> which most every command needs to do.  And striping out the insano- 
> sucking commons-cli really simplified command implementations  
> dramatically IMO.
>
> Anyways... I've make a heck of a lot of progress on cleaning up the  
> GShell framework... and more is to come I'm sure...  But for now, I  
> think its probably ready for use primetime as the Geronimo Server's  
> bootloader.
>
> I think this provides a some significant value...
>
>  1) Platform scripts become consistent and relatively simple, easy  
> to maintain
>
>  2) Everyone will now have a consist way of launching the server,  
> even if you like a .sh, .bat, or java -jar, then end process that  
> is launched will be the same for everyone.
>
>  3) Opens up the door for some really nice and fancy fancy  
> management muck (like restarting the server from the web console,  
> or cloning a server instance or backing up a server instance...)
>
>  4) Lays the ground work for future features, like cluster  
> management, remote administration and scripting...
>
>  * * *
>
> So, I think its time to decide... are we a go or no go for GShell  
> as the core CLI for Geronimo thingys and even more important, are  
> we go or no go for using GShell to boot up the server process?
>
> --jason
>


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