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Full Discussion: Virtual IP address in HACMP
Operating Systems AIX Virtual IP address in HACMP Post 302309460 by zaxxon on Wednesday 22nd of April 2009 01:34:52 AM
Old 04-22-2009
I guess you mean IP alias instead of "virtual IP address".
It depends in which state the cluster node is and if RGs are up. Usually production addresses are configured as alias when RGs are started. Else a cluster node has it's boot addresses configured which are usually permanent addresses, no aliases.

To get a glimpse at current active IP configuration, use:
Code:
/usr/es/sbin/cluster/clstat -o

Not sure if there is an easier way to distinguish what is an alias and what not, you can check with ifconfig -a, which adapter has more than 1 IP configured, example:
Code:
$> ifconfig -a
...
en5: flags=7e040823,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),PSEG,LARGESEND,CHAIN>
        inet 10.10.29.111 netmask 0xffffff00 broadcast 10.10.29.255
        inet 10.10.30.111 netmask 0xffffff00 broadcast 10.10.30.255
         tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0
...

Ok, en5 has 2 addresses; let's check the ODM:

Code:
$> odmget -q "name = en5" CuAt

CuAt:
        name = "en5"
        attribute = "netaddr"
        value = "10.10.30.111"
        type = "R"
        generic = "DU"
        rep = "s"
        nls_index = 4

CuAt:
        name = "en5"
        attribute = "netmask"
        value = "255.255.255.0"
        type = "R"
        generic = "DU"
        rep = "s"
        nls_index = 8

CuAt:
        name = "en5"
        attribute = "state"
        value = "up"
        type = "R"
        generic = "DU"
        rep = "sl"
        nls_index = 5

As you can see the address 10.10.29.111 showing up with ifconfig is not in the ODM. So this is the alias which is only configured on this cluster node, when the related RG (Resource Group) is activated.
Last edited by zaxxon; 04-22-2009 at 02:58 AM.. Reason: Added Info
 

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LEARN ABOUT MINIX

hostaddr

HOSTADDR(1)						      General Commands Manual						       HOSTADDR(1)

NAME

       hostaddr - show ethernet address, IP address or hostname

SYNOPSIS

       hostaddr [-eia] [-E eth-device] [-I ip-device]

DESCRIPTION

       Without	any  of  the -eia options, hostaddr shows the ethernet address, IP address and hostname of the local host on one line in the given
       order.  With options only the wanted fields are shown, still in the same order, not in option order.

OPTIONS

       -e     Show the ethernet address.

       -i     Show the IP address.  This will not work if no IP address has been found by RARP or by setting it with ifconfig(8).

       -a     Show the fully qualified hostname.  The IP address is shown again if it can't be translated to a host name.  (This usually indicates
	      that the DNS reverse address translation tables are incomplete.)

SEE ALSO

       ifconfig(8), rarpd(8), nonamed(8), set_net_default(8), boot(8).

DIAGNOSTICS

       "Timeout"
       Hostaddr  timed	out trying to get the IP address.  This means that the network connection is out of order or that the setup of the machine
       is bad.

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																       HOSTADDR(1)
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