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Home System Tutorial LINUX Use Bash script to write a simple and practical Linux health check tool

Use Bash script to write a simple and practical Linux health check tool

Feb 13, 2024 pm 01:18 PM
linux linux tutorial linux system linux command shell script embeddedlinux Getting started with linux linux learning

Linux是一个强大而复杂的操作系统,它可以运行在各种硬件和环境中,提供各种功能和服务。但是,Linux也需要定期地进行健康检查,以确保系统的正常运行和性能。Linux有很多内置的命令和工具可以用来检查系统的状态和参数,但是这些命令和工具可能需要手动地输入和执行,比较繁琐和耗时。本文将介绍如何使用Bash脚本来编写一个简单而实用的Linux健康检查工具,可以一键地检查系统的基本信息、资源使用情况、网络连接情况等。

编写脚本

$ vim linuxmi

#! /bin/bash
#color notes
NC='\033[0m'
GREEN='\033[0;32m'
RED='\033[0;31m'
YELLOW='\033[0;33m'
cyan='\033[0;36m'
yellow='\033[0;33m'
#Sectioning .........
echo -e "${YELLOW}----------------------
--------------------------------------------------------------------------------
---------${NC}"
echo "Server details:"
echo -e "${YELLOW}---------------------------
-----------------------------------------------------------------------------------

-${NC}"

#fetching basic specs from the server(user,ip,os)

user=`whoami`
echo -e "${cyan}User:${NC} $user"

hostname=`hostname`
echo -e "${cyan}hostname:${NC} $hostname"

ip=`hostname -I`
echo -e "${cyan}IP address:${NC} $ip"

os=`cat /etc/os-release | grep 'NAME\|VERSION' | grep -v 'VERSION_ID' | grep -v 
'PRETTY_NAME' | grep NAME`
echo -e "${cyan}OS:${NC} $os"

#Sectioning.....
echo -e "${YELLOW}-------------------
------------------------------------------------------------------------------------
--------${NC}"
echo "Service status:"
echo -e "${YELLOW}-------------------------------
--------------------------------------------------------------------------------${NC}"
sleep 1

#checking tomcat status
echo -e "${yellow}1) Tomcat${NC}"
#grepping tomcat status from ps aux

pp=`ps aux | grep tomcat | grep "[D]java.util"`
if [[ $pp =~ "-Xms512M" ]];then

 echo -e "   Status: ${GREEN}UP${NC}"

else

 echo -e "   Status: ${RED}DOWN${NC}"

fi
echo ""
#function to check apache is running or 

not!
function apache(){
echo -e "${yellow}2) Apache-httpd${NC}"
#grepping apache status from ps aux

httpd=`ps aux | grep httpd | grep apache`
if [[ $httpd =~ "apache" ]];then

 echo -e "   Status: ${GREEN}UP${NC}"

else

 echo -e "   Status: ${RED}DOWN${NC}"

fi


}

#function to check elastic is running or not
function elastic(){
echo -e "${yellow}3) Elasticsearch${NC}"
#grepping elasticsearch status from ps aux

elastic=`ps aux | grep elasticsearch`
if [[ $elastic =~ "elastic+" ]];then

  echo -e "   Status: ${GREEN}UP${NC}"
else

 echo -e "    Status: ${RED}DOWN${NC}"

fi
#function to check mysql is running or not

}
function mysql(){
echo -e "${yellow}4) Mysql${NC}"
#grepping mysql status from ps aux

mysql=`ps aux | grep mysqld`
if [[ $mysql =~ "mysqld" ]];then

 echo -e "   Status: ${GREEN}UP${NC}"
else

 echo -e "   Status: ${RED}DOWN${NC}"

fi

}


function docker(){
echo -e "${yellow}5) Docker${NC}"
#grepping docker status from ps aux

docker=`systemctl status docker | grep dead`
if [[ $docker =~ "dead" ]];then

 echo -e "   Status: ${GREEN}UP${NC}"
else

 echo -e "   Status: ${RED}DOWN${NC}"

fi

}

#calling functions
apache
echo ""
elastic
echo ""
mysql
echo ""
docker
echo ""
#Sectioning............
#Fetching mem and cpu informations
echo -e "${YELLOW}--
-------------------------------------------------------------------------------------
------------------------${NC}"
echo "Memory Details:"
echo -e "${YELLOW}----------------
----------------------------------------------------------------------------------------
-------${NC}"

sleep 1
#view mem info

free -h
#get uptime details
uptime=$(uptime | awk '{print $3,$4}' | cut -f1 -d,)
echo -e "${cyan}System Uptime:${NC} :$uptime"
#Fetching the load average

loadaverage=$(top -n 1 -b | grep "load average:" | awk '{print $10 $11 $12}')
echo -e "${cyan}Load average:${NC}: $loadaverage"
echo -

e "${cyan}The top 10 services with high resource usage are listed below.${NC}"
#Get
 top services with high resource utilization

ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head


#sectioning...........
#Fetching server space details!
echo -e "${YELLOW}--------------------

------------------------------------------------------------------------------------------

-${NC}"
echo "Server space Details:"
echo -e "${YELLOW}--------------------------------------

------------------------------------------------------------------------

-${NC}"
#View disk space details

df -h


echo "-------------------------------------------------------------------------------------

---------------------------"
Copy after login
Use Bash script to write a simple and practical Linux health check tool

2、我们可以将该脚本转换为全局命令,将文件移动到 sbin 目录,并赋予执行权限。

linuxmi@linuxmi ~/www.linuxmi.com
 % sudo cp linuxmi /usr/sbin/               
[sudo] linuxmi 的密码: 
linuxmi@linuxmi ~/www.linuxmi.com
 % sudo chmod +x /usr/sbin/linuxmi
linuxmi@linuxmi ~/www.linuxmi.com
Copy after login

3、现在您可以在 shell 的任何位置调用该脚本。

linuxmi@linuxmi ~/www.linuxmi.com
 % linuxmi
Copy after login

示例输出如下:

Use Bash script to write a simple and practical Linux health check toolUse Bash script to write a simple and practical Linux health check tool

优势

  • 只需一个命令就可以轻松访问完整的服务器信息,并且还可以在出现问题时安排警报通知。
  • 编辑脚本并添加服务非常简单。
  • 显示有关正在运行的进程、磁盘空间、宕机时间、内存详细信息、高进程列表等的详细信息。

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