I need to check plenty of servers everyday. because of few servers down or changes happend… password less authentication is failing on few hosts. I need a command or script to verify that password less authentication is working fine or not on all the servers.
Usually… I get the server name on all the servers using **ssh -q <servername> uname -a **
If servers are down or key is not working… my script is getting stuck in the middle. I want to avoid it.
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If you’re using a bash script to check the status, you could use something relatively simple, such as:
checkSsh()
{
local username="${1}"
local hostname="${2}"
local privatekey="${3}"
local checkConn=$(ssh ${username}@${hostname} -i ${privatekey} "echo 2>&1" && echo UP || DOWN)
if [ "${checkConn}" == "DOWN" ];
then
# Action taken when host is down.
echo DOWN
else
# Action taken when host is up.
echo UP
fi
}
checkSsh "${1}" "${2}" "${3}"
You’d then pass on the details:
./checkssh.sh root 111.222.333.444 /path/to/key
You could even reduce that down to:
if ssh ${1}@${2} -i ${3} "echo 2>&1"; then
echo UP
else
echo DOWN
fi
And replace the echo UP|DOWN with whatever action you needed to perform. Or, if the user you’re trying to login as to test is always the same:
if ssh root@${1} -i ${2} "echo 2>&1"; then
echo UP
else
echo DOWN
fi
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