Consider the below scenario
2 vms - 192.168.229.131, 192.168.229.132
Both the vms has it's ip as 192.168.229.151 & 192.168.229.152 in it's /etc/hosts file
Say there are around 50 vms like I said above. But as of now, I am considering only the above 2.
I saved ips of the 2 vms in a file named server
#cat server
192.168.229.131
192.168.229.132
Below is the script
#!/bin/bash
cat server | while read line
do
/usr/bin/sshpass -e ssh -t -q -o StrictHostKeyChecking=no root@$line << EOF
echo successfully logged in $line
MYIP=$(ifconfig | sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p')
for i in 151 152
do
echo 192.168.229.\$i >> errips
done
for data in `cat errips`
do
echo data currently has $data
grep $data /etc/hosts
if [ $? -eq 0 ]
then
sed -i "s/$data/$MYIP/g" /etc/hosts
echo "completed"
unset MYIP
rm -rf errips
exit 0
fi
done
EOF
done
Below is the output
root@master:~# ./script
cat: errips: No such file or directory
successfully logged in 192.168.229.131
cat: errips: No such file or directory
successfully logged in 192.168.229.132
Why does the for loop after logging in the server is getting executed before logging in?
I tried using the below instead of 'for'
cat errips |while read line
echo line currently has $line
In this case, I found that line is still taking the IP from server file in localhost, whereas it should read it from errips file of the server i remotely logged in.
Output was
line currently has 192.168.229.131
line currently has 192.168.229.132
whereas I expected that it should read the values in file "errips" and output should be something like below
line currently has 192.168.229.151
line currently has 192.168.229.151
Now, I tried below command
cat errips |while read data
echo data currently has $data
In this case, the output was empty for the value data
data currently has
data currently has
How would I read the file "errips" in my remote server line by line, and grep for the line in /etc/hosts and then execute the if loop, which will replace the wrong ip with right ip?
