| Handle ip from inside VE [message #22121] | 
			Sun, 21 October 2007 16:18   | 
		 
		
			
				
				
				
					
						  
						dagr
						 Messages: 83 Registered: February 2006 
						
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		Is there a way to add and remove VE ip from inside VE ? (may be there is special vzctl capability)
		
		
		
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			| Re: Handle ip from inside VE [message #22136 is a reply to message #22132] | 
			Mon, 22 October 2007 07:59    | 
		 
		
			
				
				
				
					
						  
						dagr
						 Messages: 83 Registered: February 2006 
						
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		i checked    http://wiki.openvz.org/Virtual_Ethernet_device#Making_a_veth -device_persistent 
 
And found out problem - to make IP work i need to run on HN  
 
ip route add 192.168.0.101 dev veth101.0
  
And when i move this IP to another VPS - i will need to change routes on HNs. 
 
 
My goal is to exclude any need to make changes on HN side.  
Lets say i have 2 VEs with db and standby:  A and B . Each has main ip - ip_A and ip_B. 
And also they have migrating production IP (for switchover). 
What i want if to be able to  migrate prod_ip from A to B and back  running commands from inside VEs. (without any access to HNs ssh or else, though VEs  have access to each other). Is it possible ? 
 
 
P.S - Actually changing routes isnt necessary if there are no clients  on same HNs  which need communicate to prod_ip. In this case it would be possible just to make ifdown/ifup eth0:1 inside VEs. Still i found out problem with arp announce during ifup. I can see it via tcpdump inside VE but not on HN interface. Ie clients cant refresh their arp cache.  
i have  
/proc/sys/net/ipv4/conf/eth0/proxy_arp 
/proc/sys/net/ipv4/conf/eth0/forwarding  
/proc/sys/net/ipv4/conf/vethX/proxy_arp 
/proc/sys/net/ipv4/conf/vethX/forwarding  
set to 1.  
I also tried to set  
/proc/sys/net/ipv4/conf/.../arp_announce to 1 - but no result.  
How do i make HN to retransmit arp announce ? 
 
		
		
		[Updated on: Mon, 22 October 2007 09:37] Report message to a moderator  
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			| Re: Handle ip from inside VE [message #22165 is a reply to message #22139] | 
			Mon, 22 October 2007 17:58   | 
		 
		
			
				
				
				
					
						  
						piavlo
						 Messages: 159 Registered: January 2007 
						
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		http://en.wikipedia.org/wiki/Proxy_ARP 
 
If it might help , this is my network configuration for bridge: 
projsrv1 ~ # cat /etc/vz/vznet.conf 
#!/bin/bash
EXTERNAL_SCRIPT="/etc/vz/bin/vzbridge.add"
projsrv1 ~ # cat /etc/vz/bin/vzbridge.add 
#!/bin/bash
CONFIGFILE=/etc/vz/conf/$VEID.conf
. $CONFIGFILE
VZHOSTIF=`echo $NETIF |sed 's/^.*host_ifname=\(.*\),.*$/\1/g'`
BRIDGED_VES_REGEXP='(101|102|103)'
echo "$VEID" | egrep -e "$BRIDGED_VES_REGEXP" > /dev/null
if [ "$?" == "0" ]; then
        if [ ! -n "$VZHOSTIF" ]; then
                echo "According to $CONFIGFILE VE$VEID has no veth interface configured."
                exit 1
        fi
        ifconfig veth${VEID}.0 0
        brctl addif br0 veth${VEID}.0
        exit $?
fi
exit 0
projsrv1 ~ # 
The eth0 is enslaved to br0
		
		
		[Updated on: Mon, 22 October 2007 18:00] Report message to a moderator  
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