Changes

Suppose you need to know how much traffic VPS eatsyour [[VE]]s eat. It can be easily done

Lets Let's consider the very simple situation: one VPS VE with one IP address on the [[Hardware Node (HN)]]with only one network interface. To be more exact , assume that VPS id [[VE]] ID is <tt>200</tt>, ip the IP address of the [[HN]]is <tt>192.168.0.56</tt>, the network interface name is <tt>eth0</tt>, ip and the IP address of VPS the [[VE]] is <tt>192.168.0.117</tt>.And you You wish to know how much bytes 200th VPS VE 200 eats. One more assumption that ther is no iptables rules

Almost any trafic that goes to and from vps a VE can be catched from by FORWARD chain of iptables module in [[VE0]],

It means, that all traffic forwarded to ip IP 192.168.0.117 and from ip IP 192.168.0.117 will be accounted.To obtain current traffic usage of VPS VE you can give issue the command:

"'''Bytes" ''' column is the column we need. It's worth to say, that restarting VPS a VE doesn't affect accounting,it remains right. But if you restart your [[hardware node ]], all the rules and consequently statistics are dropeddropped. So it'sis recommended torecomended to * run some cron job that dumps statistic on hard drive and also statistics to some file* add init script that createsiptables rules on [[HN ]] start.

As is easy to see, it's not per VPS -VE statistic, but rather per -IP statistic. Thus you must be carefullcarefulthen changing IPs of VPSsVE IP addresses, otherwise you'll get mess of results.

Saing "By saying ''almost any trafic", '' I mean, that traffic between a [[VE ]] and and [[VE0 isn't ]] is not accounted by rules above. Don't knowNot sure if it can it be useful for anybody, but to account such traffic these rules passare needed:

[root@dhcp0-56 traffic_accounting]# iptables -nv -L INPUT

[root@dhcp0-56 traffic_accounting]# iptables -nv -L OUTPUT

[root@dhcp0-56 traffic_accounting]# iptables -nv -L FORWARD

[root@dhcp0-56 traffic_accounting]# iptables -R FORWARD 1 -s 192.168.0.117[root@dhcp0-56 traffic_accounting]# iptables -nv -L FORWARD

* More than one VPS VE on the nodeJust add the rules like above for each VPS's VE IP.* More than one IP per VPSVE.

of VPS a VE you have to summarize over all IPs that this VPS VE owns.

As you see this way can be time-consuming in case of big amount number of VPSsVEs.