++ blog / uncloud 2

content/u/blog/uncloud-next

@@ -4,3 +4,62 @@
 - trigger / postgres / etcd
 - metadata!
 - building vm images!
+- generate tap names matching vm??? problem, because inteerfaces are
+  limited in length!
+
+[root@diamond hackcloud]# ip link add b23456789012345 type bridge
+[root@diamond hackcloud]# ip link add b234567890123456 type bridge
+Error: argument "b234567890123456" is wrong: "dev" not a valid ifname
+[root@diamond hackcloud]#
+
+- VMID is not uuid, but counter; using hexa; using 16**10,
+gives 1099511627776 VMs
+
+>>> (16**10)/(1000*24*365)
+125515.02600182648
+
+interface names:
+
+x = vxlan ?
+b = bridge
+v = vm
+
+
+=> 16 types possible
+
+10+1 used => 4 left
+
+2 positions for interface id? => 256 interfaces per VM
+
+mac:
+
+48 bits = 6 bytes
+1 byte = 2hexa positions
+
+prefix is 02:00: = 2 bytes
+we have 4 bytes = 8 hexa left!!!!
+embed mac suffix as ID!
+full mac = 12 bytes
+
+No vmprefix + counter -> because counter size might always be wrong
+(how many interfaces? 16? 256? ... )
+
+--------------------------------------------------------------------------------
+No stale firewall entries as we regnerate, not keep the list!
+
+table bridge filter {
+    chain prerouting {
+        type filter hook prerouting priority 0;
+        policy accept;
+
+        ibrname br100 jump netpublic-$version
+    }
+    chain netpublic-10 {
+    ...
+    }
+
+}
+
+can generate new full chain, change only the jump
+
+--------------------------------------------------------------------------------