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    Unsolved Help me understand KVM Networking

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    kvm networking setup help fedora fedora 27 cockpit
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    • JaredBuschJ
      JaredBusch @stacksofplates
      last edited by JaredBusch

      @stacksofplates said in Help me understand KVM Networking:

      @jaredbusch said in Help me understand KVM Networking:

      @stacksofplates said in Help me understand KVM Networking:

      I also usually just use macvtap. If I need host to guest communication I just set up a private network for them to communicate on.

      Well, I cannot think of a reason to require host to guest communication, except that I may want to connect from a guest to the host to update the ISO store I use occasionally.

      Ya that's really the only advantage to a full bridge.

      And for my lab, colo, and most clients, I do not see that ever being an issue.

      But I do have one specific client that will have a stand alone RHEL 7 box running KVM on a remote site. It will be running a single VM. I will have easy access to the VM, but not the host, because of "reasons" that have nothing to do with IT.

      stacksofplatesS ObsolesceO 2 Replies Last reply Reply Quote 1
      • JaredBuschJ
        JaredBusch
        last edited by

        [root@kvm ~]# nmcli connection show
        NAME                UUID                                  TYPE            DEVICE   
        Wired connection 1  5371d5ee-0c26-3e5a-ae0d-6d3683d7d584  802-3-ethernet  enp1s0f0 
        Wired connection 2  a2977c44-7e0a-3f9d-8ecc-74e222e150a9  802-3-ethernet  enp1s0f1 
        bridge0             0febbbde-8d06-475a-a21b-a88ebdf006d8  bridge          bridge0  
        eno1                3a2e709f-49c8-3ac8-aa99-aab4d616e650  802-3-ethernet  eno1     
        team0               74aa71fe-e149-49e9-94ce-ab4a22a319e4  team            team0    
        virbr0              0df1e6b8-e9e2-4538-a581-0f1c727495c4  bridge          virbr0   
        bridge-slave-team0  d44dd210-92d7-4337-b4dd-66afbd048370  802-3-ethernet  --       
        [root@kvm ~]# 
        
        1 Reply Last reply Reply Quote 0
        • JaredBuschJ
          JaredBusch @stacksofplates
          last edited by

          @stacksofplates said in Help me understand KVM Networking:

          Do the guests have network access if you give them a static address?

          I will try that.

          1 Reply Last reply Reply Quote 0
          • stacksofplatesS
            stacksofplates @JaredBusch
            last edited by stacksofplates

            @jaredbusch said in Help me understand KVM Networking:

            @stacksofplates said in Help me understand KVM Networking:

            @jaredbusch said in Help me understand KVM Networking:

            @stacksofplates said in Help me understand KVM Networking:

            I also usually just use macvtap. If I need host to guest communication I just set up a private network for them to communicate on.

            Well, I cannot think of a reason to require host to guest communication, except that I may want to connect from a guest to the host to update the ISO store I use occasionally.

            Ya that's really the only advantage to a full bridge.

            And for my lab, colo, and most clients, I do not see that ever being an issue.

            But I do have one specific client that will have a stand alone RHEL 7 box running KVM on a remote site. It will be running a single VM. I will have easy access to the VM, but not the host, because of "reasons" that have nothing to do with IT.

            Ah ic. I really wish there was an easy way to get ovs installed on RHEL 7/CentOS 7.

            1 Reply Last reply Reply Quote 0
            • JaredBuschJ
              JaredBusch
              last edited by

              So working, but lots of packet loss for a while.

              0_1514491104806_d57c0e5a-bcbf-4512-8d41-507781e19336-image.png

              It seems solid now.
              0_1514491185933_152af0bb-9c5e-4e27-bc15-f61046d98734-image.png

              Nevermind.. while it was trying to communicate out to get the base repo info, the pings failed. Once that timed out, the pings worked. Just tried it a couple times...

              1 Reply Last reply Reply Quote 0
              • JaredBuschJ
                JaredBusch @stacksofplates
                last edited by

                @stacksofplates said in Help me understand KVM Networking:

                I also usually just use macvtap. If I need host to guest communication I just set up a private network for them to communicate on.

                So how do you setup a private connection?

                I have no issues with using macvtap on the team.

                stacksofplatesS 1 Reply Last reply Reply Quote 0
                • stacksofplatesS
                  stacksofplates @JaredBusch
                  last edited by

                  @jaredbusch said in Help me understand KVM Networking:

                  @stacksofplates said in Help me understand KVM Networking:

                  I also usually just use macvtap. If I need host to guest communication I just set up a private network for them to communicate on.

                  So how do you setup a private connection?

                  I have no issues with using macvtap on the team.

                  You can just create it in Virt-Manager. I'll jump on my laptop and take a screenshot.

                  1 Reply Last reply Reply Quote 0
                  • stacksofplatesS
                    stacksofplates
                    last edited by stacksofplates

                    Just click on your connection and go to edit -> connection details and click on the Virtual Networks tab.

                    Click the plus

                    0_1514491907472_createprivate.png

                    Then run through the wizard.

                    0_1514491928279_name.png

                    0_1514491934772_ipv4 settings.png

                    0_1514491943423_last.png

                    If you choose NAT instead it will still work but is kind of pointless since you will already have an address through the macvtap.

                    You can do this through virsh as well. The host uses dnsmasq to configure everything so you can also add reservations and all of the other goodies as well. For reservations you can just add it in after the range line:

                        <host mac='de:ad:be:ef:ca:fe' name='test-vm' ip='192.168.30.50'/>
                    

                    0_1514492370729_virsh.png

                    1 Reply Last reply Reply Quote 2
                    • JaredBuschJ
                      JaredBusch
                      last edited by

                      Works perfectly.

                      1 Reply Last reply Reply Quote 3
                      • stacksofplatesS
                        stacksofplates
                        last edited by

                        Too bad ovs isnt in the repos for RHEL/CentOS. You can set up these private networks and connect them through a VXLAN with ovs. That way you can have something like a separate dev network on the same hosts and they can communicate between hosts.

                        black3dynamiteB 1 Reply Last reply Reply Quote 0
                        • black3dynamiteB
                          black3dynamite @stacksofplates
                          last edited by

                          @stacksofplates said in Help me understand KVM Networking:

                          Too bad ovs isnt in the repos for RHEL/CentOS. You can set up these private networks and connect them through a VXLAN with ovs. That way you can have something like a separate dev network on the same hosts and they can communicate between hosts.

                          Not available in the epel repo?

                          wirestyle22W 1 Reply Last reply Reply Quote 0
                          • wirestyle22W
                            wirestyle22 @black3dynamite
                            last edited by

                            @black3dynamite said in Help me understand KVM Networking:

                            @stacksofplates said in Help me understand KVM Networking:

                            Too bad ovs isnt in the repos for RHEL/CentOS. You can set up these private networks and connect them through a VXLAN with ovs. That way you can have something like a separate dev network on the same hosts and they can communicate between hosts.

                            Not available in the epel repo?

                            That is apparently the case unless my google--fu isn't up to snuff

                            stacksofplatesS 1 Reply Last reply Reply Quote 0
                            • ObsolesceO
                              Obsolesce @JaredBusch
                              last edited by

                              @jaredbusch said in Help me understand KVM Networking:

                              I will have easy access to the VM, but not the host, because of "reasons" that have nothing to do with IT.

                              You can't access the host externally, as in you will only be able to access the host via one of it's guests? That seems like a weird requirement.

                              JaredBuschJ 1 Reply Last reply Reply Quote 0
                              • JaredBuschJ
                                JaredBusch @Obsolesce
                                last edited by

                                @tim_g said in Help me understand KVM Networking:

                                @jaredbusch said in Help me understand KVM Networking:

                                I will have easy access to the VM, but not the host, because of "reasons" that have nothing to do with IT.

                                You can't access the host externally, as in you will only be able to access the host via one of it's guests? That seems like a weird requirement.

                                Yes it is. Yet, if I drive 5 hours to be on site, I can have all the local console I want.

                                As I stated, not IT related reasoning.

                                1 Reply Last reply Reply Quote 0
                                • stacksofplatesS
                                  stacksofplates @wirestyle22
                                  last edited by

                                  @wirestyle22 said in Help me understand KVM Networking:

                                  @black3dynamite said in Help me understand KVM Networking:

                                  @stacksofplates said in Help me understand KVM Networking:

                                  Too bad ovs isnt in the repos for RHEL/CentOS. You can set up these private networks and connect them through a VXLAN with ovs. That way you can have something like a separate dev network on the same hosts and they can communicate between hosts.

                                  Not available in the epel repo?

                                  That is apparently the case unless my google--fu isn't up to snuff

                                  Nope. It is available in Fedora though. If you want to install it you have to manually build the RPMs. While not hard to build it would be a pain to maintain updates.

                                  matteo nunziatiM 1 Reply Last reply Reply Quote 1
                                  • matteo nunziatiM
                                    matteo nunziati @stacksofplates
                                    last edited by

                                    @stacksofplates said in Help me understand KVM Networking:

                                    @wirestyle22 said in Help me understand KVM Networking:

                                    @black3dynamite said in Help me understand KVM Networking:

                                    @stacksofplates said in Help me understand KVM Networking:

                                    Too bad ovs isnt in the repos for RHEL/CentOS. You can set up these private networks and connect them through a VXLAN with ovs. That way you can have something like a separate dev network on the same hosts and they can communicate between hosts.

                                    Not available in the epel repo?

                                    That is apparently the case unless my google--fu isn't up to snuff

                                    Nope. It is available in Fedora though. If you want to install it you have to manually build the RPMs. While not hard to build it would be a pain to maintain updates.

                                    OVS is used by oVirt so maybe the centos ovirt repo has it (or the ovirt stable repo)

                                    stacksofplatesS 1 Reply Last reply Reply Quote 1
                                    • stacksofplatesS
                                      stacksofplates @matteo nunziati
                                      last edited by

                                      @matteo-nunziati said in Help me understand KVM Networking:

                                      @stacksofplates said in Help me understand KVM Networking:

                                      @wirestyle22 said in Help me understand KVM Networking:

                                      @black3dynamite said in Help me understand KVM Networking:

                                      @stacksofplates said in Help me understand KVM Networking:

                                      Too bad ovs isnt in the repos for RHEL/CentOS. You can set up these private networks and connect them through a VXLAN with ovs. That way you can have something like a separate dev network on the same hosts and they can communicate between hosts.

                                      Not available in the epel repo?

                                      That is apparently the case unless my google--fu isn't up to snuff

                                      Nope. It is available in Fedora though. If you want to install it you have to manually build the RPMs. While not hard to build it would be a pain to maintain updates.

                                      OVS is used by oVirt so maybe the centos ovirt repo has it (or the ovirt stable repo)

                                      I'm assuming it's just building the RPM since it's not in the normal repo.

                                      http://resources.ovirt.org/pub/ovirt-4.2/

                                      1 Reply Last reply Reply Quote 0
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