ipvsadm lists a few hosts by IP only, rest by name
- by dmourati
We use keepalived to manage our Linux Virtual Server (LVS) load balancer. The LVS VIPs are setup to use a FWMARK as configured in iptables.
virtual_server fwmark 300000 {
delay_loop 10
lb_algo wrr
lb_kind NAT
persistence_timeout 180
protocol TCP
real_server 10.10.35.31 {
weight 24
MISC_CHECK {
misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.31"
misc_timeout 30
}
}
real_server 10.10.35.32 {
weight 24
MISC_CHECK {
misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.32"
misc_timeout 30
}
}
real_server 10.10.35.33 {
weight 24
MISC_CHECK {
misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.33"
misc_timeout 30
}
}
real_server 10.10.35.34 {
weight 24
MISC_CHECK {
misc_path "/usr/local/sbin/check_php_wrapper.sh 10.10.35.34"
misc_timeout 30
}
}
}
http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.fwmark.html
[root@lb1 ~]# iptables -L -n -v -t mangle
Chain PREROUTING (policy ACCEPT 182G packets, 114T bytes)
190M 167G MARK tcp -- * * 0.0.0.0/0 w1.x1.y1.4 multiport dports 80,443 MARK set 0x493e0
62M 58G MARK tcp -- * * 0.0.0.0/0 w1.x1.y2.4 multiport dports 80,443 MARK set 0x493e0
[root@lb1 ~]# ipvsadm -L
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
FWM 300000 wrr persistent 180
-> 10.10.35.31:0 Masq 24 1 0
-> dis2.domain.com:0 Masq 24 3 231
-> 10.10.35.33:0 Masq 24 0 208
-> 10.10.35.34:0 Masq 24 0 0
At the time the realservers were setup, there was a misconfigured dns for some hosts in the 10.10.35.0/24 network. Thereafter, we fixed the DNS. However, the hosts continue to show up as only their IP numbers (10.10.35.31,10.10.35.33,10.10.35.34) above.
[root@lb1 ~]# host 10.10.35.31
31.35.10.10.in-addr.arpa domain name pointer dis1.domain.com.
OS is CentOS 6.3. Ipvsadm is ipvsadm-1.25-10.el6.x86_64. kernel is kernel-2.6.32-71.el6.x86_64. Keepalived is keepalived-1.2.7-1.el6.x86_64.
How can we get ipvsadm -L to list all realservers by their proper hostnames?
