Re: [Xen-users] new xen guest cannot communicate with the network

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Feb 12, 2014 at 12:51:37AM -0800, simon ben wrote:
> Dear Guys,
> please excuse me and take it as a new post
> 
> I was a little worked up so i decide i start right from scratch and since 
> this are new Cisco Blade servers and not yet in procduction i had the liberty 
> to play around 
> 
> 
> Now i do face a issue again which i feel is quite weird..
> let me explain..
> I did install centos 6.5 and xen as per the docs below and everything went 
> smooth
> 
> -----------------
> 
> http://wiki.centos.org/HowTos/Xen/Xen4QuickStart
> 
> ---------
> 
> now the server has 2 NIC and I can reach the server from out entire network..
> xm info shows the below
> ----------------
> 
> [root@xenserver1 scripts]# xm info
> host                   : xenserver1.baladia.gov.kw
> release                : 3.10.29-11.el6.centos.alt.x86_64
> version                : #1 SMP Tue Feb 11 22:00:02 UTC 2014
> machine                : x86_64
> nr_cpus                : 24
> nr_nodes               : 2
> cores_per_socket       : 6
> threads_per_core       : 2
> cpu_mhz                : 2000
> hw_caps                : 
> bfebfbff:2c100800:00000000:00003f40:17bee3ff:00000000:00000001:00000000
> virt_caps              : hvm hvm_directio
> total_memory           : 32698
> free_memory            : 30222
> free_cpus              : 0
> xen_major              : 4
> xen_minor              : 2
> xen_extra              : .3-27.el6
> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
> hvm-3.0-x86_32p hvm-3.0-x86_64 
> xen_scheduler          : credit
> xen_pagesize           : 4096
> platform_params        : virt_start=0xffff800000000000
> xen_changeset          : unavailable
> xen_commandline        : dom0_mem=2048M,max:3072M loglvl=all guest_loglvl=all
> cc_compiler            : gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
> cc_compile_by          : mockbuild
> cc_compile_domain      : centos.org
> cc_compile_date        : Fri Jan 24 20:49:25 UTC 2014
> xend_config_format     : 4
> --------------
> to enable multiple guest network bridges to use multiple network cards i 
> followed the link below
> -------------------
> https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Virtualization/chap-Virtualization-Pre_Red_Hat_Enterprise_Linux_5.4_Xen_networking.html
> 

This is too old. Chances are that it won't work.

> ----
> 
> but when i run brctl show it only shows me
> 
> bridge name     bridge id               STP enabled     interfaces
> virbr0          8000.000000000000       yes
> 

There's no interface, physical or virtual, attached to this bridge. I
would suggest you configure your bridge manually instead of trying to
follow the above document. IIRC you're almost there with your previous
configuration -- at least you've got interfaces attached to bridge. TBH
I don't think following random configuration guidelines can help you
much.

Wei.

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