Bash grep file for string and use each as a variable in another commands -
in ha configuration checking periodically vip address on eth0, (lets call 2.2.2.2). if up, need bring group of ip address defined eth0 in /etc/network/interfaces configuration file:
up ip addr add **1.2.3.34** dev $iface ip addr add **1.2.3.40** dev $iface ip addr add **1.2.3.48** dev $iface and pass each ip group of commands:
ip a **1.2.3.34/32** dev eth0 ip a **1.2.3.40/32** dev eth0 ip a **1.2.3.48/32** dev eth0 what i've done far is:
#!/bin/bash status=$(ip s eth0 | grep inet | awk '{print $2}' | sed 's/addr://') if ip s eth0 | grep inet | awk '{print $2}' | sed 's/addr://' | grep 2.2.2.2/27 ; cat /etc/network/interfaces | grep -o "up ip addr add [0-9]*\.[0-9]*\.[0-9]*\.[0-9]*" | grep -o "[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*" > /tmp/ext_ip.txt now need how pass each line command mentioned above (ip a 1.2.3...), have no idea how properly.
optionally i'd revert operation if vip not present in system - in case if primary ha host go offline.
one way achieve parse ip addresses array , use for loop assign them interface:
#!/bin/bash iface='eth0' vip='192.168.0.1' ifaces_file='/etc/network/interfaces' status=$( ip address show "$iface" | grep -o "$vip" ) if [ ! -z "$status" ]; ip_addresses=( $( grep -o '[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*' "$ifaces_file" ) ) ip in "${ip_addresses[@]}"; ip address add "$ip" dev "$iface" done fi this simplified example. may want add more checks, add logging messages provide output useful debugging. also, depending on server configuration commands may not work without sudo.
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