How to check ssh is working with public key / private key

rajeshkumar created the topic: How to check ssh is working with public key / private key
Code – ssh serverhostname -o ‘BatchMode=yes’ -o ‘ConnectionAttempts=1’ true

Every time a ssh attempt fails, it rights a string “Failed” to the /var/log/secure.
Maybe you can just count that number, and if it goes above a threshold you can alert. Obviously you will need some more logic to check for the day to get your full requirement.

*** this is bash code ***
[root@jralph-linux jralph]# cat check_ssh.sh
#!/bin/bash

COUNT=$(tr -s ' ' '\n' < /var/log/secure | grep -c 'Failed') if [ $COUNT -ge "1" ] then echo "Failed SSH $COUNT" echo "We have some ssh failures" else echo "Things seem to be ok" fi

[root@jralph-linux jralph]# ./check_ssh.sh
Failed SSH 2
We have some ssh failures
Regards,
Rajesh Kumar
Twitt me @ twitter.com/RajeshKumarIn

rajeshkumar replied the topic: How to check ssh is working with public key / private key
How to check if any errors occurred during ssh?
#!/bin/bash
result=`ssh myapp 'mkdir /some/dir' 2>&1`
if -n $result; then
echo "the following error occurred: $result"
fi
Regards,
Rajesh Kumar
Twitt me @ twitter.com/RajeshKumarIn

rajeshkumar replied the topic: How to check ssh is working with public key / private key
How to check if ssh works without connecting to server?
su -c "ssh oracle@$MY_IP -o 'BatchMode=yes' -o 'ConnectionAttempts=1' true" oracle
returnCode=$?

echo "$returnCode"
if [ $returnCode != 0 ]
then
echo "Configuration is not valid"
return 1;
else
echo "Configuration is valid"
return 0;
fi
Regards,
Rajesh Kumar
Twitt me @ twitter.com/RajeshKumarIn

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

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