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--- virtualisation:kvm [2018/07/18 11:08]
Luc Nieland [Distribution: Ubuntu 18.04 LTS]
+++ virtualisation:kvm [2020/02/13 17:05] (current)
Luc Nieland CentOS-8: bond + vlan + bridge
@@ Line 207: / Line 207: @@
 Remove all .yaml files in /etc/netplan/ (or rename them to *.disabled)
-==One bridge with static IP==
+==One network, one bridge==
+A simple configuration for a simple network. The server has one bridge, with a static IP on the bridge.
 Add to  /etc/netplan/10-netconfig-bridge-static.yaml
@@ Line 234: / Line 236: @@
 ==One bridge per VLAN==
-When the system is directly connected to a network-trunk, with one or more VLANs on it:
+A more complex setup. The system has one physical NIC. This is connected to a switch. This port is in trunc-mode, and has four VLANs configured on this port.
+On the server, the four VLANs are split, and for every VLAN a bridge is created. A static IP number is configured on one bridge, to access the server.
+Remove alle files in /etc/netplan/ and create the file /etc/netplan/10-netconfig-bridge-per-vlan.yaml with the following:
-Add to  /etc/netplan/10-netconfig-bridge-per-vlan.yaml
 <code>
 network:
@@ Line 244: / Line 250: @@
     eno1:
       dhcp4: no
+      dhcp6: no
   bridges:
-    br0099:
+    br0010:
       interfaces:
-        - vlan0099
+        - vlan0010
       parameters:
         stp: false
         forward-delay: 0
-      dhcp4: no
+      addresses:
-    br0102:
+        - 192.168.10.42/24
+      gateway4: 192.168.10.1
+      nameservers:
+        addresses:
+          - 1.1.1.1
+          - 8.8.8.8
+    br0011:
       interfaces:
-        - vlan0102
+        - vlan0011
       parameters:
         stp: false
         forward-delay: 0
-      addresses:
+      dhcp4: no
-        - 192.168.2.203/24
+      dhcp6: no
-      gateway4: 192.168.2.1
+    br0012:
-      nameservers:
-        addresses:
-          - 194.109.6.66
-          - 194.109.9.99
-    br0103:
       interfaces:
-        - vlan0103
+        - vlan0012
       parameters:
         stp: false
         forward-delay: 0
       dhcp4: no
-    br1001:
+      dhcp6: no
+    br0013:
       interfaces:
-        - vlan1001
+        - vlan0013
       parameters:
         stp: false
         forward-delay: 0
       dhcp4: no
+      dhcp6: no
   vlans:
-    vlan0099:
+    vlan0010:
       accept-ra: no
-      id: 99
+      id: 10
       link: eno1
-    vlan0102:
+    vlan0011:
       accept-ra: no
-      id: 102
+      id: 11
       link: eno1
-    vlan0103:
+    vlan0012:
       accept-ra: no
-      id: 103
+      id: 12
       link: eno1
-    vlan1001:
+    vlan013:
       accept-ra: no
-      id: 1001
+      id: 13
       link: eno1
 </code>
@@ Line 303: / Line 313: @@
 <code>
 [Match]
-Name=br0*
+Name=br00*
 [Network]
@@ Line 310: / Line 320: @@
 </code>
-Explanation. This is to bring up the anonymous bridges (the ones which have no ip-address on it). Due to a bug in netplan in combination networkd, these (anonymous) bridges will have operational status 'off' after boot. This can be checked with:
+Explanation. This is to bring up the anonymous bridges automatically after boot (the bridges which have no ip-address configured on it). Due to a bug in the combination of netplan and networkd, anonymous bridges will have operational status 'off' after boot.
+This can be checked with:
   networkctl list
@@ Line 316: / Line 328: @@
 This can be solved manually with:
-  ip link set dev br0099 up
+  ip link set dev br0011 up
-  ip link set dev br0103 up
+  ip link set dev br0012 up
-  ip link set dev br1001 up
+  ip link set dev br0013 up
 for the above netplan yaml example.
@@ Line 335: / Line 347: @@
-=====Distribution: CentOS 6.0 =====
+=====Distribution: CentOS =====
 ===preparation===
-Install a minimal CentOS 6.0 system with a static IP-number.
+Install a minimal CentOS system with a static IP-number.
+===network config CentOS-8===
+With nmcli
+Add to /etc/sysconfig/
+Bonding:
+<code>
+ nmcli con add type bond con-name bond0 ifname bond0  autoconnect yes \
+         ipv4.method disabled  \
+         ipv6.method ignore
+ nmcli con add type ethernet ifname eno1 con-name bond0-sl1    master bond0
+ nmcli con add type ethernet ifname eno2 con-name bond0-sl2    master bond0
+<code>
+Split the trunc-datastream to VLAN's:
+<code>
+ nmcli con add type vlan ifname vlan20 con-name vlan20 vlan.id 20 \
+       vlan.parent bond0 \
+       ipv4.method disabled \
+       ipv6.method ignore
+ # repeat per VLAN
+<code>
+Create a bridge per VLAN:
+<code>
+BR_NAME="br20"
+BR_INT="vlan20"
+SUBNET_IP="192.168.103.32/24"
+GW="192.168.103.1"
+DNS1="192.168.102.144"
+DNS2="192.168.102.146"
+nmcli connection add    type bridge  con-name ${BR_NAME} ifname ${BR_NAME}  autoconnect yes
+ nmcli connection modify ${BR_NAME} ipv4.method manual   ipv4.addresses ${SUBNET_IP}
+ nmcli connection modify ${BR_NAME} ipv4.gateway ${GW}
+ nmcli connection modify ${BR_NAME} ipv4.dns ${DNS1} +ipv4.dns ${DNS2}
+ nmcli connection up ${BR_NAME}
+nmcli connection add type bridge-slave  con-name ${BR_INT} ifname ${BR_INT} master ${BR_NAME}    autoconnect yes
+ nmcli connection up ifname ${BR_INT}
+#
+ip r add default  via 192.168.103.1
+#
+<code>
+===hypervisor kvm===
 Install the software:
   yum install kvm virt-manager libvirt
@@ Line 632: / Line 697: @@
+======Migration of VMs to another host ======
+Instructions how to migrate VMs to another hypervisor-host.
+====Offline====
+Create a destination KVM-hypervisor system, including bridges on the required networks and VLANs. Try to use the same names for bridges, filesystems, logical-volumes. Else use "virsh edit" to make the modifications befor starting the VM on the destination hypervisor.
+===On the source-hypervisor===
+create a definition-file:
+  virsh list --all
+  virsh dumpxml --security-info  vpstest2  >  /var/lib/libvirt/images/vpstest2.xml
+  virsh shutdown vpstest2
+  virsh destroy  vpstest2   # if needed
+===On the destination-hypervisor===
+Create the required logical-volumes, and symlinks:
+  lvcreate -L 4G -n vpstest2 vg0
+  ln -s /dev/mapper/vg0-vpstest2 /var/lib/libvirt/images/vpstest2.img
+And get the raw-logical-volume with a dd piped through ssh:
+  ssh root@sourcehyp "dd if=/dev/mapper/vg0-vpstest2" | dd of=/dev/mapper/vg0-vpstest2
+And get the config-definition-file:
+  scp root@sourcehyp:/var/lib/libvirt/images/vpstest2.xml  /var/lib/libvirt/images/vpstest2.xml
+And create the VM:
+  virsh define /var/lib/libvirt/images/vpstest2.xml
+And start the VM:
+  virsh start vpstest2

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