一、编写安装脚本

[root@jindada ~]$ vim Ins-Node-Exporter.sh 
##########################################################################
# Author:          jin.hui
# QQ:              974089352
# File Name:       Ins-Node-Exporter.sh
# Copyright (C):   2021 All rights reserved
# Created Time:    2021年07月14日 星期三 10时30分09秒
#########################################################################
#!/usr/bin/bash
. /etc/init.d/functions

software_storage_path=/data/software
node_exporter_url=https://github.com/prometheus/node_exporter/releases/download/v1.1.2/node_exporter-1.1.2.linux-amd64.tar.gz
node_exporter_tar=node_exporter-1.1.2.linux-amd64.tar.gz
node_exporter_ins_dir=/opt
node_exporter_version=node_exporter-1.1.2.linux-amd64
node_exporter_link=node_exporter

# 判断软件目录是否存在
function software_storage_dir(){
	if [ -d $software_storage_path ];then
		echo "Software storage path is exist;"
	else
		echo "Software storage path is not exist,creating $software_storage_path now"
		mkdir $software_storage_path
	fi                                                                                                              
}


# 判断是否下载node_exporter
function download_node_exporter(){
	if [ -f "$software_storage_path/$node_exporter_tar" ];then
		echo "File $software_storage_path/$node_exporter_tar is exist,deleting this file"
		rm -rf $software_storage_path/$node_exporter_tar
		cd $software_storage_path
		wget $node_exporter_url &>/dev/null
	else
		echo "File $software_storage_path/$node_exporter_tar is not exist,starting download file"
		cd $software_storage_path
		wget $node_exporter_url &>/dev/null
	fi
}


# 判断是否存在旧的node_exporter应用程序
function ins_node_exporter(){
	ls $node_exporter_ins_dir |grep $node_exporter_version &>/dev/null
	if [ $? -eq 0 ];then
		echo "Directory $node_exporter_ins_dir/$node_exporter_version is exist,deleting this directory..."
		rm -rf $node_exporter_ins_dir/$node_exporter_version
		tar xf $software_storage_path/$node_exporter_tar -C $node_exporter_ins_dir
	else
		tar xf $software_storage_path/$node_exporter_tar -C $node_exporter_ins_dir
	fi
}


# 判断是否存在旧的node_exporter软连接
function node_exporter_link(){
	if [ -L "$node_exporter_ins_dir"/"$node_exporter_link" ];then
		echo "Link $node_exporter_ins_dir/$node_exporter_link is exist"
	else
		echo "Link $node_exporter_ins_dir/$node_exporter_link is not exist,creating link $node_exporter_link"
		ln -s $node_exporter_ins_dir/$node_exporter_version $node_exporter_ins_dir/$node_exporter_link
	fi
}


# 判断是否存在node_exporter的system启动
function system_node_exporter(){
ls /etc/systemd/system/ |grep node_exporter.service &>/dev/null
if [ $? -eq 0 ];then
	echo "File node_exporter.service  is exist"
else
	echo "File node_exporter.service  doesn't' exist,creating file node_exporter.service..."
cat > /etc/systemd/system/node_exporter.service << EOF
[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=root
ExecStart=/opt/node_exporter/node_exporter

[Install]
WantedBy=default.target
EOF

fi

systemctl daemon-reload
systemctl enable --now node_exporter

}

# 判断node_exporter服务是否启动
function node_exporter_start(){
ps -ef |grep node_e[xporter] &>/dev/null
if [ $? -eq 0 ];then
	action "node_exporter is started..." /bin/true
else
	systemctl restart node_exporter
	action "node_exporter is starting..." /bin/true
fi
}


# 调用函数
software_storage_dir
download_node_exporter
ins_node_exporter
node_exporter_link
system_node_exporter
node_exporter_start

二、添加执行权限

[root@jindada ~]$ chmod +x Ins-Node-Exporter.sh

三、执行脚本

[root@jindada ~]$ sh Ins-Node-Exporter.sh