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Could it be that server1 isn't working correctly that the LVS DR does
not route traffic to that server?
It can connect:
root@vps704:~/scripts# telnet server1.pcintelligence.nl 25
Trying 194.145.200.17...
Connected to server1.pcintelligence.nl.
Escape character is '^]'.
220 PCIntelligence mailserver 1 - mx1.pcintelligence.nl ESMTP
quit
221 PCIntelligence mailserver 1 - mx1.pcintelligence.nl
Connection closed by foreign host.
But I keep getting forward only to real server2:
221 PCIntelligence mailserver 2 - mx2.pcintelligence.nl
Connection closed by foreign host.
michiel@wmichiele:~$ telnet 194.145.200.87 25
Trying 194.145.200.87...
telnet: Unable to connect to remote host: No route to host
michiel@wmichiele:~$ telnet 194.145.200.87 25
Trying 194.145.200.87...
Connected to 194.145.200.87.
Escape character is '^]'.
220 PCIntelligence mailserver 2 - mx2.pcintelligence.nl ESMTP
quit
221 PCIntelligence mailserver 2 - mx2.pcintelligence.nl
Connection closed by foreign host.
And because it is RR, that is perhaps why I get the first time server2
and the 2nd time server1 and I get the telnet: Unable to connect to
remote host: No route to host
What should I check on server1?
I also tried to change the weight on the LVS DR server from server 1 to
2 so it would get more hits but no avail:
I am running this on the LVS server:
#!/bin/bash
#---------------mini-rc.lvs_dr-director------------------------
#set ip_forward OFF for lvs-dr director (1 on, 0 off)
#(there is no forwarding in the conventional sense for LVS-DR)
cat /proc/sys/net/ipv4/ip_forward
echo "0" >/proc/sys/net/ipv4/ip_forward
#director is not gw for realservers: leave icmp redirects on
echo 'setting icmp redirects (1 on, 0 off) '
echo "1" >/proc/sys/net/ipv4/conf/all/send_redirects
cat /proc/sys/net/ipv4/conf/all/send_redirects
echo "1" >/proc/sys/net/ipv4/conf/default/send_redirects
cat /proc/sys/net/ipv4/conf/default/send_redirects
echo "1" >/proc/sys/net/ipv4/conf/eth0/send_redirects
cat /proc/sys/net/ipv4/conf/eth0/send_redirects
#add ethernet device and routing for VIP 194.145.200.87
/sbin/ifconfig eth0:110 194.145.200.87 broadcast 194.145.200.87 netmask
255.255.255.255
/sbin/route add -host 194.145.200.87 dev eth0:110
#listing ifconfig info for VIP 194.145.200.87
/sbin/ifconfig eth0:110
#check VIP 194.145.200.87 is reachable from self (director)
/bin/ping -c 1 194.145.200.87
#listing routing info for VIP 194.145.200.87
/bin/netstat -rn
#setup_ipvsadm_table
#clear ipvsadm table
/sbin/ipvsadm -C
#installing LVS services with ipvsadm
#add smtp to VIP with round robin scheduling
/sbin/ipvsadm -A -t 194.145.200.87:smtp -s rr
#forward smtp to realserver using direct routing with weight 1
/sbin/ipvsadm -a -t 194.145.200.87:smtp -r 194.145.200.17 -g -w 2
#check realserver reachable from director
ping -c 1 194.145.200.17
#forward smtp to realserver using direct routing with weight 1
/sbin/ipvsadm -a -t 194.145.200.87:smtp -r 194.145.200.171 -g -w 1
#check realserver reachable from director
ping -c 1 194.145.200.171
#displaying ipvsadm settings
/sbin/ipvsadm
#not installing a default gw for LVS_TYPE vs-dr
#---------------mini-rc.lvs_dr-director------------------------
And on the real servers:
#!/bin/bash
#----------mini-rc.lvs_dr-realserver------------------
#installing default gw 192.168.1.254 for vs-dr
#/sbin/route add default gw 192.168.1.254
#showing routing table
/bin/netstat -rn
#checking if DEFAULT_GW 192.168.1.254 is reachable
#ping -c 1 192.168.1.254
#set_realserver_ip_forwarding to OFF (1 on, 0 off).
echo "0" >/proc/sys/net/ipv4/ip_forward
cat /proc/sys/net/ipv4/ip_forward
#looking for DIP 192.168.1.9
ping -c 1 194.145.200.86
#looking for VIP (will be on director)
ping -c 1 194.145.200.87
#install_realserver_vip
/sbin/ifconfig lo:110 194.145.200.87 broadcast 194.145.200.87 netmask
0xffffffff up
#ifconfig output
/sbin/ifconfig lo:110
#installing route for VIP 194.145.200.87 on device lo:110
/sbin/route add -host 194.145.200.87 dev lo:110
#listing routing info for VIP 194.145.200.87
/bin/netstat -rn
#hiding interface lo:110, will not arp
#echo "1" >/proc/sys/net/ipv4/conf/all/hidden
#cat /proc/sys/net/ipv4/conf/all/hidden
#echo "1" >/proc/sys/net/ipv4/conf/lo/hidden
#cat /proc/sys/net/ipv4/conf/lo/hidden
echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
#----------mini-rc.lvs_dr-realserver------------------
Am I missing something?
I found it awkward it server1 does not give a banner..I think LVS sees
the server up (server1) but something goes wrong with the return traffic
so that is perhaps why I sometimes get the 'Unable to connect to remote
host: No route to host'
How can I troubleshoot and confirm this?
Kind Regards,
Michiel
-------- Original Message --------
Subject: Re: [lvs-users] question about LVS
From: Michiel van Es <mve@xxxxxxxxxxxxxxxxx>
To: LinuxVirtualServer.org users mailing list.
<lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Date: 05/03/2010 02:39 PM
>
>
> -------- Original Message --------
> Subject: Re: [lvs-users] question about LVS
> From: Michael Schwartzkopff<misch@xxxxxxxxxxx>
> To: LinuxVirtualServer.org users mailing list.
> <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
> Date: 05/03/2010 02:34 PM
>
>> Am Montag, 3. Mai 2010 14:31:32 schrieb Michiel van Es:
>>> So to get it right:
>>>
>>> On the director:
>>> >>>> net.ipv4.ip_forward = 1
>>>
>>> On the real servers:
>>> >>>> net.ipv4.conf.all.arp_ignore = 1
>>> >>>> net.ipv4.conf.eth0.arp_ignore = 1
>>> >>>> net.ipv4.conf.all.arp_announce = 2
>>> >>>> net.ipv4.conf.eth0.arp_announce = 2
>>>
>>> No forwarding on the real servers right?
>>
>> Correct
>
> Thanks.
>
> I still got the same results:
>
> I only connect to server2 and never to server1, also 1 of the 2 times I
> get a 'No route to host':
>
> michiel@wmichiele:~$ telnet 194.145.200.87 25
> Trying 194.145.200.87...
> Connected to 194.145.200.87.
> Escape character is '^]'.
> 220 PCIntelligence mailserver 2 - mx2.pcintelligence.nl ESMTP
> quit
> 221 PCIntelligence mailserver 2 - mx2.pcintelligence.nl
> Connection closed by foreign host.
> michiel@wmichiele:~$ telnet 194.145.200.87 25
> Trying 194.145.200.87...
> telnet: Unable to connect to remote host: No route to host
> michiel@wmichiele:~$ telnet 194.145.200.87 25
> Trying 194.145.200.87...
> Connected to 194.145.200.87.
> Escape character is '^]'.
> 220 PCIntelligence mailserver 2 - mx2.pcintelligence.nl ESMTP
> quit
> 221 PCIntelligence mailserver 2 - mx2.pcintelligence.nl
> Connection closed by foreign host.
> michiel@wmichiele:~$ telnet 194.145.200.87 25
> Trying 194.145.200.87...
> telnet: Unable to connect to remote host: No route to host
>
>
>>
>
> _______________________________________________
> Please read the documentation before posting - it's available at:
> http://www.linuxvirtualserver.org/
>
> LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
> Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
_______________________________________________
Please read the documentation before posting - it's available at:
http://www.linuxvirtualserver.org/
LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
or go to http://lists.graemef.net/mailman/listinfo/lvs-users
|
