Changes between Initial Version and Version 1 of GENIExperimenter/Tutorials/jFed/GettingStarted_PartI/Procedure/Execute


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Timestamp:
10/16/14 13:01:03 (7 years ago)
Author:
rrhain@bbn.com
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  • GENIExperimenter/Tutorials/jFed/GettingStarted_PartI/Procedure/Execute

    v1 v1  
     1= [http://groups.geni.net/geni/wiki/GENIExperimenter/Tutorials/GettingStarted_PartI/Procedure  Lab Zero: A First Experiment Using GENI] =
     2{{{
     3#!html
     4
     5<div style="text-align:center; width:495px; margin-left:auto; margin-right:auto;">
     6<img id="Image-Maps_5201305222028436" src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/Execute.jpg?format=raw" usemap="#Image-Maps_5201305222028436" border="0" width="495" height="138" alt="" />
     7<map id="_Image-Maps_5201305222028436" name="Image-Maps_5201305222028436">
     8<area shape="rect" coords="18,18,135,110" href="./DesignSetup" alt="" title=""    />
     9<area shape="rect" coords="180,18,297,111" href="./Execute" alt="" title=""    />
     10<area shape="rect" coords="344,17,460,110" href="./Finish" alt="" title=""    />
     11<area shape="rect" coords="493,136,495,138" href="http://www.image-maps.com/index.php?aff=mapped_users_5201305222028436" alt="Image Map" title="Image Map" />
     12</map>
     13<!-- Image map text links - End - -->
     14
     15</div>
     16}}}
     17
     18
     19== 4.  Configure and Initialize ==
     20
     21
     22Now that you have reserved your resources, you are ready to run your first GENI experiment.
     23
     24=== 4.1 Login to nodes ===
     25{{{
     26#!html
     27<table border="0">
     28      <tr>
     29
     30       <td >
     31         <ol type='a'>
     32            <li>To login to a VM, again click the <b>i</b> in the circle.</li>
     33           <li>Now, click on the ssh link. If you have installed <a target="https://addons.mozilla.org/en-us/firefox/addon/firessh/"> FireSSH </a> a new tab will open up.
     34
     35           <ol type='i'>
     36           <li> If you are using FireSSH, in the window that will pop up :
     37                <ul>
     38                  <li> in the password field type in your passphrase</li>
     39                  <li> for the private key, browse to the file that has your private key
     40                   <li> <b> Press OK </b> </li>
     41                </ul>
     42             </li>
     43           </ol>
     44           </li>
     45           <li><FONT COLOR="black">Repeat the previous step for the second VM.</font></li>
     46          </ol>
     47
     48<table id="Table_03" border="0" cellpadding="5" cellspacing="0">
     49        <tr>
     50                <td>
     51                        <img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/Symbols-Tips-icon.png?format=raw" width="50" height="50" alt="Tip">
     52               </td>
     53               <td>
     54                    To ssh from the command line, do the following (substituting the values shown on the screen):
     55<pre>
     56ssh USERNAME@HOSTNAME -p PORT
     57</pre>
     58        </tr>
     59</table>
     60
     61       </td>
     62        <td>
     63        <img border="0" src="http://groups.geni.net/geni/attachment/wiki/GEC17Agenda/GettingStartedWithGENI_I/Graphics/client_ssh_highlight_v1.png?format=raw" alt="Login information for a VM"  height="325" title="Login information for a VM" />
     64<br />
     65         <b>Figure 4-1</b> <i>Login to a VM</i>.</i>
     66       </td>
     67    </tr>
     68 </table>
     69}}}
     70
     71== 5.  Execute Experiment ==
     72
     73=== 5.1 Send IP traffic ===
     74The first simple experiment that we will run is to verify the IP connectivity between our hosts.
     75 
     76    a. Check the interfaces of your nodes. In the terminal type:
     77    {{{
     78   sudo ifconfig
     79  }}}
     80    You should see at least two interfaces:
     81      * The '''control interface'''. This is the interface you use to access the node, e.g. ssh into your host. The control interface is mainly used for control traffic, i.e. traffic for controlling the node and the experiment.
     82      * The '''data interface'''. This is the interface that is used for sending experimental traffic. This is the interface that connects to the other hosts of your experiment through GENI. The links between these interfaces are the ones that allow you to run non-IP experiments. '''The data interface is the one that has an IP address and mask that match what you configured before you reserved your resources.'''
     83    b. Fill in the worksheet, noting the name and  IP address of the control and of the data interfaces for each node. 
     84{{{
     85#!html
     86
     87<table id="Table_02" border="0" cellpadding="5" cellspacing="0">
     88        <tr>
     89                <td>
     90                        <img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/Symbols-Tips-icon.png?format=raw" width="50" height="50" alt="Tip">
     91               </td>
     92               <td>
     93                    The command prompt on each node says "client" or "server" respectively.
     94               </td>
     95        </tr>
     96</table>
     97}}} 
     98    c. From the client, `ping` the server '''data plane interface'''. From the terminal window that is logged in to the client type :
     99{{{
     100    ping <server data IP addr> -c 5
     101}}}
     102       For example:
     103{{{
     104    ping 10.1.1.2 -c 5
     105}}}
     106    d. Now, `ping` the server '''control plane interface'''. From the terminal window that is logged in to the client type :
     107{{{
     108    ping <server control IP addr> -c 5
     109}}}
     110       For example:
     111{{{
     112    ping 172.17.1.9  -c 5
     113}}}
     114   
     115
     116=== 5.2 Install and use `iperf` ===
     117    a. Install the `iperf` software on both nodes, by running the
     118    appropriate command below.
     119
     120{{{
     121#!html
     122<table id="Table_03" border="0" cellpadding="5" cellspacing="0">
     123        <tr>
     124                <td>
     125                        <img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/instageni-logo.png?format=raw" width="50" height="50" alt="InstaGENI">
     126               </td>
     127               <td>
     128If you are using resources at an InstaGENI aggregate do:
     129<pre>
     130    sudo yum install iperf
     131</pre>
     132</td>
     133                   
     134        </tr>
     135</table>
     136}}}
     137
     138{{{
     139#!html
     140<table id="Table_03" border="0" cellpadding="5" cellspacing="0">
     141        <tr>
     142                <td>
     143                        <img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/exogeni-logo.png?format=raw" width="50" height="50" alt="ExoGENI">
     144               </td>
     145               <td>
     146If you are using resources at an ExoGENI aggregate do:
     147<pre>
     148    sudo apt-get install iperf
     149    hash
     150</pre>
     151</td>
     152                   
     153        </tr>
     154</table>
     155}}}
     156
     157
     158    b. Start an `iperf` server on the server node:
     159{{{
     160    iperf -s
     161}}}
     162    c. Run an `iperf` client via the data plane:
     163{{{
     164    iperf -c <server data IP addr>
     165}}}
     166       For example:
     167{{{
     168    iperf -c 10.1.1.2
     169}}}
     170''What is the bandwidth of this link?''
     171
     172''Why?''
     173    d. Run an `iperf` client via the control plane:
     174{{{
     175iperf -c <server control IP addr>
     176}}}
     177       For example:
     178{{{
     179iperf -c 172.17.2.2
     180}}}
     181''What is the bandwidth of this link?''
     182
     183''Why?''
     184    e. Type `CTRL-C` on the server node to stop the `iperf` server.
     185
     186=== 5.3 Bring down the server's data interface ===
     187
     188    a. ExoGENI nodes run a service called "neuca" that managed network interfaces on the node.  To manually adjust the IP address, we must first disable neuca on both nodes.
     189{{{
     190sudo service neuca stop
     191}}}
     192{{{
     193#!html
     194<table id="Table_03" border="0" cellpadding="5" cellspacing="0">
     195        <tr>
     196                <td>
     197                        <img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/exogeni-logo.png?format=raw" width="50" height="50" alt="ExoGENI">
     198               </td>
     199               <td>The ExoGENI "neuca" service controls a variety of network configuration details.</td>
     200                   
     201        </tr>
     202</table>
     203}}}
     204    b. From the client node, start pinging the server '''data plane interface''':
     205{{{
     206    ping <server data IP addr>
     207}}}
     208    c. On the server node, bring down the '''data plane interface'''
     209    (being careful to disable the data interface NOT the control interface):
     210{{{
     211    sudo ifconfig <server data interface name> down
     212}}}
     213
     214''After you bring down the data interface, the pings should indicate that the destination is
     215unreachable.''
     216
     217''Why?''
     218
     219{{{
     220#!html
     221
     222<table id="Table_01" border="0" cellpadding="5" cellspacing="0">
     223        <tr>
     224                <td>
     225                        <img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/warning-icon-hi.png?format=raw" width="50" height="50" alt="Warning">
     226               </td>
     227               <td>
     228                    Be extra careful to disable the IP on the data interface, bringing down the IP on the control interface means that you will lose connectivity to your host.
     229               </td>
     230        </tr>
     231</table>
     232}}}
     233
     234=== 5.4 Bring down the server's control interface ===
     235    a. From the client node, start pinging the server '''control plane interface''':
     236{{{
     237    ping <server control IP addr>
     238}}}
     239    b. From the server node, bring down the '''control plane interface''' and try to ping it from the client node:
     240{{{
     241    sudo ifconfig <server control interface name> down
     242}}}
     243
     244''Your ssh session should immediately hang.''' 
     245
     246''Why?''
     247
     248''After you bring down the control interface, the pings should indicate that the destination is
     249unreachable.  Why?''
     250
     251{{{
     252#!html
     253<table id="Table_03" border="0" cellpadding="5" cellspacing="0">
     254        <tr>
     255                <td>
     256                        <img src="http://groups.geni.net/geni/attachment/wiki/GENIExperimenter/Tutorials/Graphics/Symbols-Tips-icon.png?format=raw" width="50" height="50" alt="Tip">
     257               </td>
     258               <td>
     259                    Unfortunately, in order to recover from a situation like this where you've lost the ability to login to your nodes, the only way to recover is to delete your resources and start again.
     260        </tr>
     261</table>
     262}}}
     263
     264== 6.  Analyze Experiment ==
     265
     266Now is when you would ordinarily analyze the results of your experiment.
     267
     268=== 6.1 Logout of your nodes ===
     269 * Then type `exit` in your open terminal.
     270
     271Congratulations you have run an experiment in GENI!
     272
     273----
     274
     275= [wiki:GENIExperimenter/Tutorials/jFed/GettingStarted_PartI/Procedure Introduction] =
     276= [wiki:GENIExperimenter/Tutorials/jFed/GettingStarted_PartI/Procedure/Finish Next:  Finish] =