Changes between Version 4 and Version 5 of GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopoQuagga/DesignSetup


Ignore:
Timestamp:
06/24/16 19:22:31 (8 years ago)
Author:
pjayanth@bbn.com
Comment:

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  • GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopoQuagga/DesignSetup

    v4 v5  
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    172 == d. Install Script ==
    173 
    174 Launch Flack for your slice, and import the RSpec `4node-v1.rspec` we just saved.
    175 
    176 Click '''Import''' and select '''Import from file''' from the pull-down list, then select `4node-v1.rspec` from the location where you have just saved to, and confirm it. You will see the four-node topology on your canvas, and each node has been configured to have the custom image.
    177 
    178 [[Image(GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopo/DesignSetup:import-rspec-from-file.png)]]
    179 
    180 Now, we are ready to add an install script by editing the node property. For each node, click [[Image(GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopo/DesignSetup:info.jpg)]] to see the node information. By clicking [[Image(GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopo/DesignSetup:add-service-btn.png)]], we are able to add a service that usually refers to an install script. In this tutorial, we will add an install script called `xorp_autostart.tar.gz`, by entering the link ''http://www.gpolab.bbn.com/exp/sysexpr/xorp_autostart.tar.gz'', and the install path is set as ''/local''. By clicking [[Image(GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopo/DesignSetup:add-exe-serv-btn.png)]], we can add the commend that execute the install script. In the execute box, we enter `/bin/bash /local/xorp_autostart/start-xorp.sh`, and the shell type is `sh`.
    181 
    182 [[Image(GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopo/DesignSetup:node-install-service.png)]]
    183 
    184 Once we added the service and the execute service in Flack, apply the changes and submit the VM reservation request, the OSPF configuration file will be automatically created and the XORP will be started at `router-1` once it is initialized.
    185 
    186 Repeat the same procedures for the other three routers (i.e., `router-2`, `router-3`, `router-4`), and then '''submit''' the request. When all resources are ready, '''Save''' the RSpec as `4node-v2.rspec` at this stage, we will load this RSpec in the next step to get the same setup. (You can download a sample RSpec for `4node-v2.rspec` at [http://www.gpolab.bbn.com/exp/sysexpr/rspec-for-wiki/4node-v2.rspec here])
    187 
    188 Setting up the install script will automate installation or configuration process at every node's postboot stage, and we do not need to login to every node to run `start-xorp.sh` manually.
    189 
    190 = 2. Impact to Request RSpec =
    191 
    192 Whenever we make a change to node information or link information in Flack, the user request RSpec is modified accordingly. In other words, we can rely on Flack to easily modify the request RSpec.
    193 
    194 Now let's take a look at how the steps [wiki:GENIExperimenter/Tutorials/SystematicExprCaseStudy/InstallSoftware#a4.VerifyInstaGENICustomImage Load a Custom Image] and [wiki:GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopo/DesignSetup#e.InstallScript Adding Install Scripts] will modify the request RSpec. For instance, before adding the custom image and install scripts, the RSpec describing `router-1` was like:
    195 
    196 {{{
    197 <node client_id="router-1" component_manager_id="urn:publicid:IDN+instageni.stanford.edu+authority+cm" component_id="urn:publicid:IDN+instageni.stanford.edu+node+pc3" component_name="pc3" exclusive="false">
    198     <vnode name="pcvm3-3" xmlns="http://www.protogeni.net/resources/rspec/ext/emulab/1"/>
    199     <location latitude="37.43" longitude="-122.17" country="US"/>
    200     <interface client_id="xen-0:if0">
    201       <ip address="192.168.1.1" netmask="255.255.255.0" type="ipv4"/>
    202       <flack:interface_info addressBound="true" bound="false"/>
    203     </interface>
    204     <interface client_id="xen-0:if1">
    205       <ip address="192.168.4.2" netmask="255.255.255.0" type="ipv4"/>
    206       <flack:interface_info addressBound="true" bound="false"/>
    207     </interface>
    208     <flack:node_info x="150" y="407" unbound="true"/>
    209   </node>
    210 }}}
    211 
    212 First, when we added the custom image (see [wiki:GENIExperimenter/Tutorials/SystematicExprCaseStudy/InstallSoftware#a4.VerifyInstaGENICustomImage Load a Custom Image]), a new tag `<sliver>` will be added to `router-1`'s RSpec, which is
    213 
    214 {{{
    215   <sliver_type name="emulab-xen">
    216       <disk_image url="https://www.instageni.clemson.edu/image_metadata.php?uuid=5417bcef-224e-11e4-aa5a-000000000000"/>
    217   </sliver_type>
    218 }}}
    219 
    220 
    221 Secondly, when we added the install scripts (see [wiki:GENIExperimenter/Tutorials/SystematicExprCaseStudy/SmallTopo/DesignSetup#e.InstallScript Adding Install Scripts]), a new tag `<service>` will be added to `router-1`'s RSpec, which is
    222 {{{
    223    <services>
    224       <execute command="/bin/bash /local/xorp_autostart/start-xorp.sh" shell="sh"/>
    225       <install install_path="/local" url="http://www.gpolab.bbn.com/exp/sysexpr/xorp_autostart.tar.gz"/>
    226    </services>
    227 }}}
    228 
    229 This indicates that we can add custom image and postboot scripts by directly modifying the request RSpec, this is helpful when we have a larger topology.
    230 
    231 
    232 
    233 
    234 = 3. Script to Capture Routing Table Periodically =
    235 
    236 
    237 In this tutorial, one metric we would like to evaluate is how often the routing table will be updated when there is a link/node failure. To emulate a link failure, we can disable the virtual interfaces, and to emulate a virtual router failure, we can stop the XORP process at the virtual router. A short script (downloaded from [http://www.gpolab.bbn.com/exp/sysexpr/xorp_run.tar.gz here] is available to be loaded as an install script.
    238 
    239 Delete any existing resources or create a new slice, '''LOAD''' the RSpec `4node-v2.rspec`, and add a new install service to every node in Flack. Now, the service portion for each node becomes to
    240 {{{
    241     <services>
    242       <execute command="/bin/bash /local/xorp_autostart/start-xorp.sh" shell="sh"/>
    243       <install install_path="/local" url="http://www.gpolab.bbn.com/exp/sysexpr/xorp_autostart.tar.gz"/>
    244       <install install_path="/local" url="http://www.gpolab.bbn.com/exp/sysexpr/xorp_run.tar.gz"/>
    245     </services>
    246 }}}
    247 
    248 After adding the new install script to every node, send the resource reservation request. When all nodes are ready to login,  we save the new modified RSpec as `4node-v3.rspec`. (You can download a sample RSpec for `4node-v3.rspec` at [http://www.gpolab.bbn.com/exp/sysexpr/rspec-for-wiki/4node-v3.rspec here])
    249 
    250 In the next step, we will add two end hosts to current four-node topology, so now we can delete existing resources from the current slice.
    251 
    252 = 4. Add End Hosts and Install `iperf` =
     172
     173
     174= 2. Add End Hosts and Install `iperf` =
    253175
    254176