Re: [lvs-users] keepalived how to load balance

[Sharif Uddin <sharif@xxxxxxxxxx>]

I have set up keepalived for load balancing. It works for redundancy but
does not work when trying to load balance.

I am using multiple servers and have exact same configurations on both
servers. debian 64 bit squeeze.

keepalived conf:

[CODE]
# Configuration File for Keepalived

# Global Configuration
global_defs {
    notification_email {
      sharif@xxxxxxxx
    }
    notification_email_from keepalived@xxxxxxxx
    smtp_server smtp.xxxx.lan
    smtp_connect_timeout 30
    router_id DEBIAN2        # string identifying the machine
}

# describe virtual service ip
vrrp_instance VI_1 {
    # initial state
    state BACKUP
    interface eth0
    # arbitary unique number 0..255
    # used to differentiate multiple instances of vrrpd
    virtual_router_id 1
    # for electing MASTER, highest priority wins.
    # to be MASTER, make 50 more than other machines.
    priority 60
    authentication {
      auth_type PASS
      auth_pass xxx
    }

    virtual_ipaddress {
      192.168.0.199/32
    }

    smtp_alert
}

# describe virtual web server
virtual_server 192.168.0.199 8080 {
#  delay_loop 5

    # lc = least connected
    lb_algo rr

    # DR = Dynamic routing (best)
    lb_kind NAT

#  persistence_timeout 50
    protocol TCP

    real_server 192.168.0.212 80 {
      TCP_CHECK {
        connect_timeout 1
#      nb_get_retry 2
#      delay_before_retry 60
      }
    }
    real_server 192.168.0.213 80 {
      TCP_CHECK {
        connect_timeout 1
#      nb_get_retry 2
#      delay_before_retry 60
      }
    }
}


[/CODE]





The servers are debain2 and debain3.

Now if debian3 is master i can netcat into port 8080 to debian2 but it
won't work for debian3 locally using rr algorithm. same would happen if
debian2 was master and debian3 backup. however i can ping the VIP from
any local pc.



[CODE]
rootdebian3:/etc/keepalived# ipvsadm -l -n --stats
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port               Conns   InPkts  OutPkts  InBytes
OutBytes
    ->  RemoteAddress:Port
TCP  192.168.0.199:8080                  8       21       10
1205      572
    ->  192.168.0.212:80                    4       17       10
965      572
    ->  192.168.0.213:80                    4        4        0
240        0

[/CODE]

In the above debian3 is master and debian 2 is backup. nothing is sent
back when it tries itself



[CODE]

rootdebian3:/etc/keepalived# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
    ->  RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.0.199:8080 rr
    ->  192.168.0.212:80             Masq    1      0          0
    ->  192.168.0.213:80             Local   1      0          0



2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP>  mtu 1500 qdisc pfifo_fast
state UP qlen 1000
      link/ether 00:17:31:8f:74:1c brd ff:ff:ff:ff:ff:ff
      inet 192.168.0.213/24 brd 192.168.0.255 scope global eth0
      inet 192.168.0.199/32 scope global eth0
      inet6 fe80::217:31ff:fe8f:741c/64 scope link
         valid_lft forever preferred_lft forever



[/CODE]



I have the following in ''/etc/sysctl.conf''
net.ipv4.ip_forward = 1
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.default.rp_filter = 0



I have manually tried to add NAT rule onto backup using ''iptables -A
PREROUTING -t nat -d 192.168.0.199 -p tcp -j REDIRECT'' but that doesn't
work. I have also tried to change ''lb_kind'' to ''DR'' but that doesn't
work. I have read many how to guides and have followed exactly same
procedures and none seem to work.

I have loaded modules using modprobe




On 14/04/11 11:26, Roy van Baekel wrote:
> On 04/14/2011 10:34 AM, Sharif Uddin wrote:
>> Hi,
>>
>> I have read many "how to guides" on load balancing with keepalived and I
>> can't seem to get it to work. They all seem to be outdated or something
>> missing or wrong.  I have posted before but no one seems to reply.
>>
>>
>> Can anyone help?
>>
>> I want to load balance using only keepalived multiple servers.
>>
>> _______________________________________________
>> 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
>>
> Show us some configurations you've tried and we'll be able to help
> further... The documentation might be old (2001), but mostly it's still
> correct... :)
>

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