Tim, In Install Wizard, we do take user-input and invoke arbitrary commands on the agent-side. On the "Confirm Hosts" page, the following call is made to invoke "Host Checks":
POST http://c6401.ambari.apache.org:8080/api/v1/requests Form data: { "RequestInfo":{ "action":"check_host", "context":"Check host", "parameters":{ "check_execute_list":"host_resolution_check", "jdk_location":"http://c6401.ambari.apache.org:8080/resources/";, "threshold":"20", "hosts":"c6401.ambari.apache.org,c6402.ambari.apache.org, c6403.ambari.apache.org" } }, "Requests/resource_filters":[ { "hosts":"c6401.ambari.apache.org,c6402.ambari.apache.org, c6403.ambari.apache.org" } ] } You can see that this "check_host" custom action is defined via a file called system_action_definitions.xml [1]. There's a corresponding "check_host.py" script that gets executed upon "action=check_host" API call invocation [2]. I hope this helps. There's also a feature to allow commands directly on the server without involving the agent, but this is WIP [3] For now you can achieve a similar effect by executing commands on the ambari-agent co-hosted with ambari-server. [1] https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/custom_action_definitions/system_action_definitions.xml#L23 [2] https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/custom_actions/check_host.py [3] https://issues.apache.org/jira/browse/AMBARI-7985 Yusaku On Tue, Nov 11, 2014 at 7:01 AM, Tim <[email protected]> wrote: > Yusaku Sako, > > I've been learning about ember and how client side frameworks work only > recently. We have a script we'd like to run with user input during ambari > setup in order to prepare the nodes. We have three or four different LANs > for each node, and the script makes sure we're using the right LAN and > hostname on each node. This isn't a use case that makes sense for anyone > but Unisys and our clusters. > > So, I've added a step 3.5 to the install wizard in ambari-web which seems > to work fine. However, it needs to give ambari-server the user input, have > ambari-server save it to a file, and then wait for ambari-server to invoke > and finish running the script. > > I've tried looking at how the other install wizard steps interact with > ambari-server, but it doesn't make sense just yet. If you could let me know > where to look in ambari-server, that would be help a lot. > > Thanks, > Tim Schoenheider > > 2014-11-10 18:33 GMT-06:00 Yusaku Sako <[email protected]>: > > > If you can describe your concrete use case, we may be able to help you > with > > what kind of changes should be made where. > > > > Yusaku > > > > On Mon, Nov 10, 2014 at 4:30 PM, Yusaku Sako <[email protected]> > > wrote: > > > > > Hi Tim, > > > > > > Ambari-web code runs on the browser (it's not server-side JavaScript). > > > Ambari-web communicates with ambari-server over REST and REST only. > > > So if you want to log stuff on the server, you need to modify > > > ambari-server code. > > > > > > Yusaku > > > > > > On Sun, Nov 9, 2014 at 10:31 AM, Tim <[email protected]> wrote: > > > > > >> Srimanth Gunturi, > > >> > > >> We have a bash script that we'd like to run during the ambari install > > >> wizard. I'm trying to add another step to the wizard that can invoke > the > > >> script. I'm not understanding ember as a client-side framework and how > > >> ambari does things on the server (such as writing to disk). We > wouldn't > > >> submit these changes back to the community since they're oddly > specific > > to > > >> our setup. > > >> > > >> Thanks, > > >> Tim Schoenheider > > >> > > >> 2014-11-08 14:01 GMT-06:00 Srimanth Gunturi <[email protected] > >: > > >> > > >> > Hi Tim, > > >> > I was hoping if you could elaborate on the use-case of why Ambari UI > > >> should > > >> > access the filesystem? > > >> > Regards, > > >> > Srimanth > > >> > > > >> > > > >> > On Sat, Nov 8, 2014 at 11:44 AM, Tim <[email protected]> wrote: > > >> > > > >> > > Hello again, > > >> > > > > >> > > I'm trying to do something like "var fs = require('fs')" somewhere > > in > > >> > > ambari-web so that I can write to a file in a controller. Adding > it > > to > > >> > > "ambari-web\app\controllers\wizard\step3_controller.js", I get > > >> > > > > >> > > Uncaught Error: Cannot find module "fs" from > > >> > > "controllers/wizard/step3_controller" > > >> > > > > >> > > > > >> > > I get similar errors/exceptions when adding to app.js or > > installer.js > > >> > too. > > >> > > My question is, how can I either require this module or write to a > > >> file > > >> > in > > >> > > one of ambari's controllers? > > >> > > > > >> > > Is it likely that something is wrong with my setup/node > > installation? > > >> It > > >> > > seems that this should always work. > > >> > > > > >> > > I've tried this on a clean ambari-web without any of my changes, > > >> > following > > >> > > > > >> > > > > >> > > > >> > > > https://cwiki.apache.org/confluence/display/AMBARI/Coding+Guidelines+for+Ambari > > >> > > to acquire and build it. > > >> > > > > >> > > Thanks, > > >> > > Tim Schoenheider > > >> > > > > >> > > > >> > -- > > >> > CONFIDENTIALITY NOTICE > > >> > NOTICE: This message is intended for the use of the individual or > > >> entity to > > >> > which it is addressed and may contain information that is > > confidential, > > >> > privileged and exempt from disclosure under applicable law. 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