centos 監控

1.pom.xml引入

<dependency>
           <groupId>ch.ethz.ganymed</groupId>
           <artifactId>ganymed-ssh2</artifactId>
           <version>262</version>
        </dependency>

2.java程式碼

package com.ruoyi.project.system.learn.controller;

import ch.ethz.ssh2.ChannelCondition;
import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

public class SSHClient {

    private String ip;
    private String username;
    private String password;

    private String charset = Charset.defaultCharset().toString();
    private static final int TIME_OUT = 1000 * 5 * 60;

    private Connection conn;

    public SSHClient(String ip, String username, String password) {
        this.ip = ip;
        this.username = username;
        this.password = password;
    }

    /**
     * 登入指遠端伺服器
     * @return
     * @throws IOException
     */
    private boolean login() throws IOException {
        conn = new Connection(ip);
        conn.connect();
        return conn.authenticateWithPassword(username, password);
    }

    public int exec(String shell)  {
        int ret = -1;
        try {
            if (login()) {
                Session session = conn.openSession();
                session.execCommand(shell);
                session.waitForCondition(ChannelCondition.EXIT_STATUS, TIME_OUT);
                ret = session.getExitStatus();
                
             // 獲得標準輸出流
                InputStream is = new StreamGobbler(session.getStdout());
                BufferedReader brs = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                List<String> result = new ArrayList<>();
                for (String line = brs.readLine(); line != null; line = brs.readLine()) {
                    System.out.println(line);
                }
                 


            } else {
                throw new Exception("登入遠端機器失敗" + ip); // 自定義異常類 實現略
            }
        }catch(Exception e){
            e.printStackTrace();
        } finally {
            if (conn != null) {
                conn.close();
            }
        }
        return ret;
    }

    public static void main(String[] args){
        try {
            SSHClient sshClient = new SSHClient("IP地址", "使用者名稱", "密碼");
            sshClient.exec("/root/free.sh"); //指令碼檔案
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

3.指令碼檔案free.sh，賦予許可權：chmod +x free.sh

# FNR = 行， print = 列
#記憶體
MEM_USED=$(free | awk 'FNR == 2 {print $3}')
MEM_TOTAL=$(free | awk 'FNR == 2 {print $2}')
echo $MEM_TOTAL $MEM_USED

#磁碟使用率
DISK_USAGE=$(df -h | awk 'FNR == 6 {sub(/%/, ""); print $5}')
echo $DISK_USAGE

#檢視java程序cpu使用率
echo $(top -bn 1 | grep "java" | awk '{print $9}')

#IO
iowait=`vmstat |awk '{if(NR==3) print $16}'`
echo  ${iowait}

#檢視RuoYi.jar程序ID
id=`ps -ef | grep RuoYi.jar | grep -v grep | awk '{print $2}'`
echo $id