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<title>Configuring Networking on the Compute Node</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"/><link rel="home" href="index.html" title="OpenStack Compute Administration Manual"/><link rel="up" href="ch06.html" title="Chapter 6. Networking"/><link rel="prev" href="ch06s01.html" title="Networking Options"/><link rel="next" href="ch07.html" title="Chapter 7. Running OpenStack Compute"/><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><script type="text/javascript">

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</style><link rel="shortcut icon" href="../favicon.ico" type="image/x-icon"/><link rel="stylesheet" type="text/css" href="../common/css/positioning.css"/><link rel="stylesheet" type="text/css" href="../common/jquery/theme-redmond/jquery-ui-1.8.2.custom.css"/><link rel="stylesheet" type="text/css" href="../common/jquery/treeview/jquery.treeview.css"/><script type="text/javascript" src="../common/jquery/jquery-1.4.2.min.js"></script><script type="text/javascript" src="../common/jquery/jquery-ui-1.8.2.custom.min.js"></script><script type="text/javascript" src="../common/jquery/jquery.cookie.js"></script><script type="text/javascript" src="../common/jquery/treeview/jquery.treeview.min.js"></script><script type="text/javascript" src="search/htmlFileList.js"></script><script type="text/javascript" src="search/htmlFileInfoList.js"></script><script type="text/javascript" src="search/nwSearchFnt.js"></script><script type="text/javascript" src="search/stemmers/en_stemmer.js"/><script type="text/javascript" src="search/index-1.js"></script><script type="text/javascript" src="search/index-2.js"></script><script type="text/javascript" src="search/index-3.js"></script></head><body><div id="header"><img src="../common/images/openstack-logo.png" alt="OpenStack Documentation" width="157" height="47"/><p class="breadcrumbs"><a href="#">OpenStack Manuals</a><a href="#">Object Storage</a></p><h1>Configuring Networking on the Compute Node<br/>Chapter 6. Networking</h1><div id="navheader" align="right"><table class="navLinks"><tr><td><a id="showHideButton" onclick="showHideToc();" class="pointLeft" title="Hide TOC tree">Sidebar

</a></td><td><a accesskey="p" class="navLinkPrevious" href="ch06s01.html">Prev</a>

<a accesskey="n" class="navLinkNext" href="ch07.html">Next</a></td></tr></table></div></div><div id="content"><div class="section" title="Configuring Networking on the Compute Node"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="d5e400"/>Configuring Networking on the Compute Node</h2></div></div></div>

<p>To configure the Compute node's networking for the VM images, the overall steps are:</p>

<p>Set the --network-manager flag in nova.conf.</p>

</li><li class="listitem">

<p>Use the <code class="code">nova-manage network create CIDR n n</code> command to

create the subnet that the VMs reside on.</p>

</li><li class="listitem">

<p>Integrate the bridge with your network. </p>

</li></ol></div>

<p>By default, Compute uses the VLAN Network Mode. You choose the networking mode for your

virtual instances in the nova.conf file. Here are the three possible options: </p>

<p>--network_manager = nova.network.manager.FlatManager</p>

<p>Simple, non-VLAN networking</p>

</li><li class="listitem">

<p>--network_manager = nova.network.manager.FlatDHCPManager</p>

<p>Flat networking with DHCP</p>

</li><li class="listitem">

<p>--network_manager = nova.network.manager.VlanManager</p>

<p>VLAN networking with DHCP. This is the Default if no network manager is

defined in nova.conf. </p>

</li></ul></div>

<p>Use the "nova-manage network create 192.168.0.0/24 1 255" command to create the subnet

that your VMs will run on. </p><div class="section" title="Configuring Flat Networking"><div class="titlepage"><div><div><h3 class="title"><a id="d5e423"/>Configuring Flat Networking</h3></div></div></div>

<p>Ensure that your nova.conf file contains the line:</p>

<p>

</p><div class="literallayout"><p>--network_manager = nova.network.manager.FlatManager</p></div><p>

</p>

<p>Compute defaults to a bridge device named ‘br100’ which is stored in the Nova

database, so you can change the name of the bridge device by modifying the entry in

the database. </p>

<p>Set the compute node's external IP address to be on the bridge and add eth0 to

that bridge. To do this, edit your network interfaces configuration to look like the

following example: </p>

<p>

</p><div class="literallayout"><p>< begin /etc/network/interfaces > <br/>

# The loopback network interface <br/>

auto lo <br/>

iface lo inet loopback <br/>

<br/>

# Networking for OpenStack Compute <br/>

auto br100 <br/>

<br/>

iface br100 inet dhcp <br/>

bridge_ports eth0 <br/>

bridge_stp off <br/>

bridge_maxwait 0 <br/>

bridge_fd 0 <br/>

< end /etc/network/interfaces > </p></div><p>

</p>

<p>Next, restart networking to apply the changes: <code class="code">sudo /etc/init.d/networking

restart</code></p></div>

<div class="section" title="Configuring Flat DHCP Networking"><div class="titlepage"><div><div><h3 class="title"><a id="d5e434"/>Configuring Flat DHCP Networking</h3></div></div></div><p>FlatDHCP doesn't create VLANs, it creates a bridge. This bridge works just fine on a single

host, but when there are multiple hosts, traffic needs a way to get out of the

bridge onto a physical interface. Be careful when setting up --flat_interface, if

you specify an interface that already has an IP it will break and if this is the

interface you are connecting through with SSH, you cannot fix it unless you have

ipmi/console access.</p>

<p>If you have an unused interface on your hosts that has connectivity with no ip

address, you can simply tell FlatDHCP to bridge into the interface by specifying

--flat_interface=<interface> in your flagfile. The network host will

automatically add the gateway ip to this bridge. You can also add the interface to

br100 manually and not set flat_interface. If this is the case for you, edit your

100

nova.conf file to contain the following lines: </p>

101

<p>

102

</p><div class="literallayout"><p>--dhcpbridge_flagfile=/etc/nova/nova.conf<br/>

103

--dhcpbridge=/usr/bin/nova-dhcpbridge<br/>

104

--network_manager=nova.network.manager.FlatDHCPManager<br/>

105

--flat_network_dhcp_start=10.0.0.2<br/>

106

--flat_interface=eth2<br/>

107

--flat_injected=False<br/>

108

--public_interface=eth0</p></div><p>

109

</p>

110

<p>Integrate your network interfaces to match this configuration.</p></div>

111

<div class="section" title="Configuring VLAN Networking"><div class="titlepage"><div><div><h3 class="title"><a id="d5e441"/>Configuring VLAN Networking</h3></div></div></div><p>TBW</p></div>

112

<div class="section" title="Enabling Ping and SSH on VMs"><div class="titlepage"><div><div><h3 class="title"><a id="d5e444"/>Enabling Ping and SSH on VMs</h3></div></div></div>

113

<p>Be sure you enable access to your VMs by using the ‘euca-authorize’ command. Below,

114

you will find the commands to allow ‘ping’ and ‘ssh’ to your VMs: </p>

115

<div class="literallayout"><p>euca-authorize -P icmp -t -1:-1 default <br/>

116

euca-authorize -P tcp -p 22 default</p></div><p>If

117

you still cannot ping or SSH your instances after issuing the ‘euca-authorize’ commands,

118

look at the number of ‘dnsmasq’ processes that are running. If you have a running

119

instance, check to see that TWO ‘dnsmasq’ processes are running. If not, perform the

120

following: <code class="code">killall dnsmasq service nova-network restart</code></p></div></div><script type="text/javascript" src="../common/main.js"></script><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch06s01.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch06.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch07.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div></div><div><div id="leftnavigation" style="padding-top:3px; background-color:white;"><div id="tabs"><ul><li><a href="#treeDiv"><span class="contentsTab">Contents</span></a></li><li><a href="#searchDiv"><span class="searchTab">Search</span></a></li></ul><div id="treeDiv"><img src="../common/images/loading.gif" 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href="ch04s02.html#d5e242">Installing the Compute Node</a></span></li><li><span class="file"><a href="ch04s02.html#d5e252">Restart All Relevant Services on the Compute Node</a></span></li></ul></li></ul></li><li><span class="file"><a href="ch04s03.html">Configuring OpenStack Compute</a></span><ul><li><span class="file"><a href="ch04s03.html#d5e260">Set Up OpenStack Compute Environment on the Compute Node</a></span></li><li><span class="file"><a href="ch04s03.html#d5e269">Create Certifications</a></span></li><li><span class="file"><a href="ch04s03.html#d5e276">Setting Flags in the nova.conf File</a></span></li><li><span class="file"><a href="ch04s03.html#d5e336">Enable Access to VMs on the Compute Node</a></span></li></ul></li></ul></li><li><span class="file"><a href="ch05.html">Installing and Configuring OpenStack Imaging Service</a></span><ul><li><span class="file"><a href="ch05s01.html">System Requirements</a></span></li><li><span class="file"><a href="ch05s02.html">Installing OpenStack Imaging Service on Ubuntu </a></span><ul><li><span class="file"><a href="ch05s02.html#d5e361">Example Installation Architecture</a></span></li><li><span class="file"><a href="ch05s02.html#d5e364">Installing the OpenStack Imaging Service</a></span><ul><li><span class="file"><a href="ch05s02.html#d5e379">Setting up the SQL Database</a></span></li></ul></li></ul></li></ul></li><li><span class="file"><a href="ch06.html">Networking</a></span><ul><li><span class="file"><a href="ch06s01.html">Networking Options</a></span></li><li id="webhelp-currentid"><span class="file"><a href="ch06s02.html">Configuring Networking on the Compute Node</a></span><ul><li><span class="file"><a href="ch06s02.html#d5e423">Configuring Flat Networking</a></span></li><li><span class="file"><a href="ch06s02.html#d5e434">Configuring Flat DHCP Networking</a></span></li><li><span class="file"><a href="ch06s02.html#d5e441">Configuring VLAN Networking</a></span></li><li><span class="file"><a 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