On 6/11/2014 10:03 AM, Zoltan Frombach wrote: > > On 6/11/2014 3:50 PM, Steve Campbell wrote: >> On 6/10/2014 4:00 PM, Zoltan Frombach wrote: >>> On 6/10/2014 9:51 PM, Steve Campbell wrote: >>>> On 6/10/2014 3:38 PM, Zoltan Frombach wrote: >>>>> On 6/10/2014 9:27 PM, Steve Campbell wrote: >>>>>> On 6/10/2014 3:09 PM, Zoltan Frombach wrote: >>>>>>> Steve, >>>>>>> >>>>>>> Try the following config. >>>>>>> >>>>>>> On your host: >>>>>>> >>>>>>> /etc/sysconfig/network-scripts/ifcfg-eth0 : >>>>>>> >>>>>>> DEVICE=eth0 >>>>>>> BOOTPROTO=none >>>>>>> ONBOOT=yes >>>>>>> NM_CONTROLLED=no >>>>>>> TYPE=Ethernet >>>>>>> HWADDR=xx:xx:xx:xx:xx:xx <- put your physical NIC's MAC address >>>>>>> here >>>>>>> BRIDGE=br0 >>>>>>> USERCTL=no >>>>>>> IPV6INIT=no >>>>>>> IPV6_AUTOCONF=no >>>>>>> >>>>>>> >>>>>>> /etc/sysconfig/network-scripts/ifcfg-br0 : >>>>>>> >>>>>>> DEVICE=br0 >>>>>>> BOOTPROTO=static >>>>>>> ONBOOT=yes >>>>>>> NM_CONTROLLED=no >>>>>>> TYPE=Bridge >>>>>>> IPADDR=10.0.5.16 >>>>>>> NETMASK=255.255.255.0 <- you may need to adjust this to your >>>>>>> network >>>>>>> GATEWAY=10.0.5.1 >>>>>>> DNS1=8.8.8.8 >>>>>>> DNS2=8.8.4.4 >>>>>>> PEERDNS=yes >>>>>>> DELAY=0 >>>>>>> STP=off >>>>>>> USERCTL=no >>>>>>> IPV6INIT=no >>>>>>> IPV6_AUTOCONF=no >>>>>>> >>>>>>> >>>>>>> Restart networking on the host. >>>>>>> >>>>>>> Then inside you VM: >>>>>>> >>>>>>> /etc/sysconfig/network-scripts/ifcfg-eth0 : >>>>>>> >>>>>>> DEVICE=eth0 >>>>>>> BOOTPROTO=static >>>>>>> ONBOOT=yes >>>>>>> NM_CONTROLLED=no >>>>>>> TYPE=Ethernet >>>>>>> HWADDR=xx:xx:xx:xx:xx:xx <- it must be a unique MAC address for >>>>>>> your VM >>>>>>> IPADDR=10.0.5.17 >>>>>>> NETMASK=255.255.255.0 <- you may need to adjust this to your >>>>>>> network >>>>>>> GATEWAY=10.0.5.1 >>>>>>> DNS1=8.8.8.8 >>>>>>> DNS2=8.8.4.4 >>>>>>> PEERDNS=yes >>>>>>> USERCTL=no >>>>>>> IPV6INIT=no >>>>>>> IPV6_AUTOCONF=no >>>>>>> >>>>>>> >>>>>>> Then in Virtual Machine Manager make sure that your VM's NIC is >>>>>>> connected to the br0 bridge, like this: >>>>>>> >>>>>>> Network Source: Specify shared device name >>>>>>> Bridge Name: br0 >>>>>>> >>>>>>> >>>>>>> >>>>>>> On 6/10/2014 8:16 PM, Steve Campbell wrote: >>>>>>>> On 6/10/2014 12:43 PM, Digimer wrote: >>>>>>>>> On 10/06/14 12:38 PM, Steve Campbell wrote: >>>>>>>>>> On 6/10/2014 12:05 PM, Digimer wrote: >>>>>>>>>>> On 10/06/14 11:46 AM, Steve Campbell wrote: >>>>>>>>>>>> On 6/10/2014 10:46 AM, Digimer wrote: >>>>>>>>>>>>> On 10/06/14 10:03 AM, Steve Campbell wrote: >>>>>>>>>>>>>> I had so much trouble putting Centos 6 guest VMs on a >>>>>>>>>>>>>> Centos 5 >>>>>>>>>>>>>> host >>>>>>>>>>>>>> that >>>>>>>>>>>>>> I finally switched to a Centos 6 host. >>>>>>>>>>>>>> >>>>>>>>>>>>>> I've not needed more that test VMs, so I've used Virtual >>>>>>>>>>>>>> Machine >>>>>>>>>>>>>> Manager >>>>>>>>>>>>>> on the old system, which worked pretty well, so I decided to >>>>>>>>>>>>>> create my >>>>>>>>>>>>>> first KVM guest machine. I noticed when I created it, I only >>>>>>>>>>>>>> had the >>>>>>>>>>>>>> options of NAT for my network interface, so I used that >>>>>>>>>>>>>> (obvious). >>>>>>>>>>>>>> >>>>>>>>>>>>>> Well, after starting the VM, I find I don't have >>>>>>>>>>>>>> connectivity >>>>>>>>>>>>>> with >>>>>>>>>>>>>> that >>>>>>>>>>>>>> interface. Reading, I find examples where I need to create >>>>>>>>>>>>>> bridges >>>>>>>>>>>>>> perhaps. Xen did most of this for me, so it's a little >>>>>>>>>>>>>> new to >>>>>>>>>>>>>> me. >>>>>>>>>>>>>> >>>>>>>>>>>>>> Can anyone throw me a clue, please? >>>>>>>>>>>>>> >>>>>>>>>>>>>> steve campbell >>>>>>>>>>>>> Setting up a bridge is not that hard, and it will give >>>>>>>>>>>>> your VMs >>>>>>>>>>>>> direct >>>>>>>>>>>>> access to the outside world, and host <-> VM access just >>>>>>>>>>>>> fine as >>>>>>>>>>>>> well. >>>>>>>>>>>>> >>>>>>>>>>>>> Here is a link showing how to setup a bridge connected to a >>>>>>>>>>>>> bond >>>>>>>>>>>>> device. Ignore the bond and pretend it is a straight ethX >>>>>>>>>>>>> device: >>>>>>>>>>>>> >>>>>>>>>>>>> https://alteeve.ca/w/AN!Cluster_Tutorial_2#Configuring_our_Bridge.2C_Bonds_and_Interfaces >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>> The host has a device named virbr0 that is installed during >>>>>>>>>>>> system >>>>>>>>>>>> installation. It also has a network device vnet0. There are no >>>>>>>>>>>> files in >>>>>>>>>>>> /etc/sysconfig/network-scripts for these. >>>>>>>>>>>> >>>>>>>>>>>> Shouldn't I be able to use the virbr0 virtual bridge for this? >>>>>>>>>>>> I've >>>>>>>>>>>> tried setting up the VM's device with all of the options >>>>>>>>>>>> that is >>>>>>>>>>>> listed, >>>>>>>>>>>> but to no avail. >>>>>>>>>>>> >>>>>>>>>>>> Should I need to set up another bridge for this? >>>>>>>>>>>> >>>>>>>>>>>> And thanks for the link. >>>>>>>>>>>> >>>>>>>>>>>> steve >>>>>>>>>>> virbr0 is created and managed by libvirtd. If you open Virtual >>>>>>>>>>> Machine >>>>>>>>>>> Manager, connect to localhost and then double-click on >>>>>>>>>>> 'localhost', >>>>>>>>>>> you will see a tab for creating/managing bridges (NAT'ed, >>>>>>>>>>> generally). >>>>>>>>>>> I disable 'virbr0' as NAT'ing is generally not what I want. >>>>>>>>>>> >>>>>>>>>>> The 'vnetX' devices are dynamically created to link a VM's >>>>>>>>>>> interface >>>>>>>>>>> to a bridge. Think of them as virtual network cables. They get >>>>>>>>>>> created >>>>>>>>>>> and destroyed as needed. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>> Sorry, but I'm confused: >>>>>>>>>> >>>>>>>>>> My host server has a real NIC and IP address with a real >>>>>>>>>> gateway to >>>>>>>>>> the >>>>>>>>>> outside: >>>>>>>>>> virtbr0 IP: 192.168.122.1 >>>>>>>>>> Host IP: 10.0.5.16 >>>>>>>>>> Gateway IP: 10.0.5.1 >>>>>>>>>> on eth0 and this works >>>>>>>>>> >>>>>>>>>> My VM server has all fake stuff currently: >>>>>>>>>> Host IP: 10.0.5.17 >>>>>>>>>> Gateway IP: 10.0.5.1 >>>>>>>>>> on eth0 and this is like NIC without a cable. >>>>>>>>>> >>>>>>>>>> So I need to create a bridge device on both the host and VM >>>>>>>>>> (lets >>>>>>>>>> say I >>>>>>>>>> name it br1). I change the eth0 config file on both host and >>>>>>>>>> VM to >>>>>>>>>> point >>>>>>>>>> to br1 and give the br1 config file on both host and VM the >>>>>>>>>> correct >>>>>>>>>> IP. >>>>>>>>>> But won't this just let the two talk to each other. How will >>>>>>>>>> the VM >>>>>>>>>> server get outside? >>>>>>>>>> >>>>>>>>>> steve >>>>>>>>> The bridge is created only on the host. Think of the bridge as >>>>>>>>> being >>>>>>>>> like a virtual switch. When a VM is created, you tell it to >>>>>>>>> connect to >>>>>>>>> the bridge, similar to how you would plug a physical wire into a >>>>>>>>> real >>>>>>>>> switch. That provides the link to the network, and then you >>>>>>>>> configure >>>>>>>>> the virtual server's network just as if it was a real network. >>>>>>>>> >>>>>>>>> On the host, you don't set the IP on the ethX device, instead you >>>>>>>>> tell >>>>>>>>> ethX to connect to the bridge (look at 'bond2' in the link above >>>>>>>>> for >>>>>>>>> the 'BRIDGE="..."' line). Then you move the host's IP >>>>>>>>> address/config >>>>>>>>> to the bridge itself (look at the 'vbr2' in the link above). >>>>>>>>> >>>>>>>>> If you're still stuck, tell me the IP addresses you want to >>>>>>>>> set in >>>>>>>>> the >>>>>>>>> host and VM and I'll see if I can bang out a couple sample >>>>>>>>> 'ifcfg-X' >>>>>>>>> files. >>>>>>>>> >>>>>>>> I'm running into some problems with my config files where I get a >>>>>>>> message that says the network can't determine my interface names. >>>>>>>> I'll >>>>>>>> look further, but the IPs above are what I need. 10.0.5.1 is a >>>>>>>> firewall >>>>>>>> that NATs the 10.0.5.0/24 network to another outside public >>>>>>>> firewall. >>>>>>>> >>>>>>>> Thanks >>>>>>>> steve >>>>>>>> _______________________________________________ >>>>>>>> CentOS-virt mailing list >>>>>>>> CentOS-virt@xxxxxxxxxx >>>>>>>> http://lists.centos.org/mailman/listinfo/centos-virt >>>>>>>> >>>>>> Stuck in a rut now. Restarting the network indicates : >>>>>> >>>>>> Device eth0 does not seem to be present, delaying initialization. >>>>>> >>>>>> I thought it might be due to the fact I didn't have the "TYPE" in >>>>>> the >>>>>> ifcfg-eth0 file, but after adding that, I still get the error. >>>>> NM_CONTROLLED=no might help with that. >>>> I turned off and stopped NetworkManager and had already specified >>>> this. >>>>>> I'm using the same hardware address that was in the original eth0 >>>>>> file. >>>>> That is fine. >>>>> >>>>>> My bridge device starts fine, but I'll tailor it to your specs. >>>>> Also, you might want to check the contents of your >>>>> /etc/udev/rules.d/70-persistent-net.rules file. Is the MAC address >>>>> for >>>>> eth0 the same as in your /etc/sysconfig/network-scripts/ifcfg-eth0 >>>>> file? >>>>> >>>> They are the same except the udev file has lower case letters in it. >>> You mean the hexadecimal numbers are lower case? That shouldn't matter. >>> >>> Try to delete the file /etc/udev/rules.d/70-persistent-net.rules and >>> reboot your host machine. >>> ( See >>> http://www.andrewklau.com/device-eth0-does-not-seem-to-be-present-delaying-initialization/ >>> >>> ) >>> >> All is well on the host now, and I've brought up the VM and configured >> it to use the bridge. I can ping the host from the VM but I have no >> access beyond the local network. The host sees the world, but the VM >> only sees the 10.0.5.0/24 network. > Did you set the gateway in your VM to 10.0.5.1 ? > Can you ping the gateway ( ping 10.0.5.1 ) from the VM? > Do you have a firewall configured in your VM (or host) ? If so, try to > disable the firewall temporarily for testing. > The gateway is set. Can't ping the gateway. Firewalls (iptables and ip6tables) are stopped and off. Previous post suggested the route. I'll check it. steve _______________________________________________ CentOS-virt mailing list CentOS-virt@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos-virt
