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打算在跳板机上写一个shell脚本，批量检查远程服务器上的main进程是否在健康运行中。
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先找出其中一台远程机器，查看main进程运行情况
[root@two002 tmp]# ps -ef|grep main root 23448 23422 0 11:40 pts/0 00:00:00 grep --color=auto main [root@two002 tmp]# ps -ef|grep main|grep -v grep|wc -l
shell检查脚本如下
[root@two002 tmp]# cat /tmp/main_check.sh #!/bin/bash NUM=$(ps -ef|grep main|grep -v grep|wc -l) if [ $NUM -eq 0 ];then echo "It's not good! main is stoped!" else echo "Don't worry! main is running!" fi
执行脚本
[root@two002 tmp]# sh -x /tmp/main_check.sh ++ grep main ++ grep -v grep ++ wc -l ++ ps -ef + NUM=2 + '[' 2 -eq 0 ']' + echo 'Don'\''t worry! main is running!' Don't worry! main is running! [root@two002 tmp]# sh /tmp/main_check.sh Don't worry! main is running!
如上执行结果，发现脚本执行过程中，看到赋予NUM参数的结果值是2！但是手动执行ps -ef|grep main|grep -v grep|wc -l的结果明明是0！！
这是由于grep匹配的问题，需要grep进行精准匹配，即"grep -w"。这就需要将main_check.sh脚本内容修改如下：
[root@two002 tmp]# cat /tmp/main_check.sh #!/bin/bash NUM=$(ps -ef|grep -w main|grep -v grep|wc -l) if [ $NUM -eq 0 ];then echo "Oh!My God! It's broken! main is stoped!" else echo "Don't worry! main is running!" fi
再次执行检查脚本，就OK了
[root@two002 tmp]# sh -x /tmp/main_check.sh ++ grep -w main ++ grep -v grep ++ wc -l ++ ps -ef + NUM=0 + '[' 0 -eq 0 ']' + echo 'Oh!My God! It'\''s broken! main is stoped!' Oh!My God! It's broken! main is stoped! [root@two002 tmp]# sh /tmp/main_check.sh Oh!My God! It's broken! main is stoped!
故在跳板机上，批量检查远程服务器的main进程运行状态的脚本为：
[root@tiaoban ~]# cat /usr/bin/main_check #!/bin/bash NUM=$(ps -ef|grep -w main|grep -v grep|wc -l) if [ $NUM -eq 0 ];then echo "Oh!My God! It's broken! main is stoped!" else echo "Don't worry! main is running!" fi [root@tiaoban ~]# cat /opt/script/main_check.sh #!/bin/bash for i in $(cat /opt/ip.list) do /usr/bin/rsync -e "ssh -p22" -avpgolr /usr/bin/main_check $i:/usr/bin/ > /dev/null 2>&1 ssh -p22 root@$i "echo $i;sh /usr/bin/main_check" done