[ovs-discuss] Fwd: Assistance with setting-up Open vSwitch

Tue Dec 22 00:51:28 UTC 2009

All,
    For both openssl and the kernel-headers, I have the same versions installed as the ones given by the two links below and I'm still getting the same errors. I read somewhere online that the second error (the one where the "build" folder does not exist) occurs because I have not built my kernel.  Is that possible?

--Sydney

----- Original Message -----
From: "Justin Pettit" <jpettit at nicira.com>
To: "Ali Sydney" <asydney at k-state.edu>
Cc: "Openvswitch" <discuss at openvswitch.org>
Sent: Monday, December 21, 2009 6:13:52 PM GMT -05:00 US/Canada Eastern
Subject: Re: [ovs-discuss] Assistance with setting-up Open vSwitch

On Dec 21, 2009, at 2:31 PM, Ali Sydney wrote:

ERROR 1.
checking for SSL... no
configure: WARNING: Cannot find libssl:

No package 'libssl' found

OpenFlow connections over SSL will not be supported.

ERROR 2.
checking for /lib/modules/2.6.27.41-170.2.117.fc10.x86_64/build directory... no
configure: error: source dir /lib/modules/2.6.27.41-170.2.117.fc10.x86_64/build doesn't exist

Now I know that OpenSSL (The package which contains libssl) is installed (because I have checked on the installed version "OpenSSL 0.9.8g 19 Oct 2007"). Can you please provide some idea as to why I would be encountering this problem? Also, is it a MUST to install a "kernel" based switch to obtain MAXIMUM switch performance?

My guess is that you don't have the OpenSSL development package installed (this contains headers and libraries that we need to link against).  I don't use Fedora, but a quick search indicates that the package is called "openssl-devel".  This may be the one you want:

         http://tinyurl.com/yjdyrcy

On the kernel issue, my guess is that you don't have the kernel headers installed.  I think this is the package you likely want:

         http://tinyurl.com/yzqh5of

For maximum performance, you do need the kernel-based switch.  If you run it from userspace, then every packet has to make the kernel/userspace transition.

 4. To bypass these 2 errors, I simply run "./configure," then "make," and "make install." Everything seems to have worked fine.

 Right, this bypasses building the kernel module and SSL support...

 5. Now, I have setup a simple configuration file with a bridge named "lucia" which has three external ports.

 bridge.lucia.port=eth0
 bridge.lucia.port=eth1
 bridge.lucia.port=eth2

If you're not going to use the kernel module, you need to use a slightly different configuration.  It's described below:

         http://tinyurl.com/yfu7abw

Note that you need to be working from the master branch in order to have userspace support.  The tarballs we've been putting up on the site are from the "citrix" branch.  You can get a snapshot of the master branch by clicking here:

         http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=snapshot;sf=tgz

 6. Below is the 4 final lines in the output of the command "#ovs-vswitchd":

 Dec 21 16:14:46|00514|dpif|WARN|/dev/net/dp255: open failed (No such device or address)
 Dec 21 16:14:46|00515|bridge|ERR|failed to delete datapath dp255: No such device or address
 Dec 21 16:14:46|00516|dpif|WARN|/dev/net/dp0: open failed (No such device or address)
 Dec 21 16:14:46|00517|bridge|ERR|failed to create datapath lucia: No such device or address

 How do I define the device/bridge "lucia" and its 3 external ports (eth0, eth1, eth2)?

 If you follow those userspace instructions (or build the kernel module), you shouldn't see these errors.

--Justin

----- Forwarded Message -----
From: "Ali Sydney" <asydney at k-state.edu>
To: "Openvswitch" <discuss at openvswitch.org>
Sent: Monday, December 21, 2009 5:31:57 PM GMT -05:00 US/Canada Eastern
Subject: Assistance with setting-up Open vSwitch

All,
   I have just started experimenting with open vswitch and my objective is to use a linux host as an openflow switch and manage this switch using an openflow controller. However, I am having difficulties building the switch. Please take note of the following 6 points and I would appreciate it if you could provide responses accordingly:

Note: All points are related to the document "INSTALL.Linux" found in openvswitch-0.90.7.tar.gz file.

1. I am running Fedora 10 (2.6.27.41-170.2.117.fc10.x86_64) 
2. I am pretty sure that I have all the requirements from the "INSTALL.Linux" file
3. From the "Building and Installing Open vSwitch for Linux" section I attempted to run the following configuration command:

./configure --with-l26=/lib/modules/`uname -r`/build --enable-ssl=yes

I am assuming that this command allows me to obtain a kernel based switch which will be managed by an openflow controller.  However, below is a snapshot of the 2 errors obtained: