檢查 ssh-key 多個伺服器

我需要編寫一個腳本來檢查在多個 Redhat 伺服器（大約 980 個伺服器）上使用 ssh-key 對使用者進行的身份驗證。

使用者可以編輯使用者 ID 和私有 ssh 密鑰位置的腳本。

腳本必須：

• 檢查成功登錄或失敗（如果要求輸入密碼）並輸出到日誌文件；
• 從 servers.txt 讀取伺服器 IP/主機名；
• 如果伺服器離線則跳過。

最好的方法是什麼？

像這樣的東西：

#!/bin/bash
# I assume "logfile" is the log file. If you just want the last run 
# in the log fil, use date> logfile.
# It is always a good idea to get a time stamp in this kind of logs.
date >> logfile 

# The read takes the input from servers.txt, which is done at the
# bottom using `done < servers.txt`.
# Some people like to do `cat servers.txt | while read -r hostname ; do`
# but they get negative comments on stackexchange :-)
while read -r hostname ; do

   # Test if the host is up with a simple ping
   # Throw away all output.
   if ping -c1 "$hostname"  > /dev/null 2>/dev/null; then

       # We now test if a host is up with a simple command, echo.
       # with -o PasswordAuthentication=no, we make sure that password
       # authentication is not used. Output the result to the logfile.
       if ssh  -o PasswordAuthentication=no "$hostname" echo ' '; then
           echo "OK - $hostname" >>logfile
       else
           echo "AArrrghhh $hostname" >> logfile
       fi
   else
       # I assumed you want some idea of how many servers are skipped.
       echo "skipped $hostname" >> logfile
   fi
done < servers.txt

這是一個快速的寫作，它可能需要一些調整。評論應該給你一些關於檢查什麼的提示。

引用自：https://unix.stackexchange.com/questions/531134