Can you suggest a more efficient way for this? - Shell Programming and Scripting

mikie · #1 (**permalink**) 11-20-2006

Hi

I have the following at the end of a service shutdown script used in part of an active-passive failover setup:

Code:

###
# Shutdown all primary Network Interfaces
# associated with failover
###

# get interface names based on IP's
# and shut them down to simulate loss of
# heartbeatd

PRIV_IP="10.0.4.81"
INT_IP="192.168.0.10"

PRIV_IF=`ifconfig |grep -B 1 ${PRIV_IP}| awk '{ printf ("%s\t" , $1) }'| awk '{ print $1 }'|tr -d ":"`
INT_IF=`ifconfig |grep -B 1 ${INT_IP}| awk '{ printf ("%s\t" , $1) }'| awk '{ print $1 }'|tr -d ":"`


ifconfig ${PRIV_IF} down
ifconfig ${INT_IF} down
exit 0

Essentially it uses the IP to obtain the name of the interface associated with that IP, and then shutdown the relevant interface (this simulates a loss of connection and instigates failover. I have another NIC that I am able to ssh into to make sure that the server remains in its failed state - i.e. the script does not shutdown the primary server). The PRIV_IP, for example, is associated with bond0. The output for bond0 is the following:

Code:

bond0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 10.0.4.81 netmask 0xff000000 broadcast 10.255.255.255
        inet x.x.x.x netmask xxxxxxxxxx broadcast x.x.x.x
        ether 00:0d:93:9d:9e:8f 
        media: autoselect (1000baseT <full-duplex,flow-control>) status: active
        supported media: autoselect
        bond interfaces: en0 en1

Is there any way to make this more elegant/efficient?

Mike

aigles · #2 (**permalink**) 11-20-2006

Code:

###
# Shutdown all primary Network Interfaces
# associated with failover
###

# get interface names based on IP's
# and shut them down to simulate loss of
# heartbeatd

PRIV_IP="10.0.4.81"
INT_IP="192.168.0.10"

PRIV_IF=`ifconfig |grep -B 1 ${PRIV_IP}| awk -v FS=: '{ print $1 }`
INT_IF=`ifconfig |grep -B 1 ${INT_IP}| awk -v FS=: '{ print $1 }'`


ifconfig ${PRIV_IF} down
ifconfig ${INT_IF} down
exit 0

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