stress模拟系统负载较高时的场景

#!/bin/bash

#获取网卡名称
network_adapter=`ip a|grep "BROADCAST"|awk '{print $2}'|awk -F: '{print $1}'`

function Net_speed_limiting {
    #输入提示
    read -p "Please input Net speed limiting rate(kbit): " Net_rate
    read -p "Waiting time(s): " wait_time
    #echo -e "Please input Net speed limiting rate:  \c\t  "
    #与单位拼接成字符串
    Net_rate_=$Net_rate"kbit"
    #带宽限制命令
    tc qdisc add dev $network_adapter root tbf rate $Net_rate latency 50ms burst 1000 >/dev/null 2>&1 &
    #等待时间，单位s
    for i in $(seq 1 $wait_time)
    do
        echo -ne "Count down $wait_time \r"  #不换行刷新数据
        sleep 1
        ((wait_time--));
    done
    
    #解除带宽限制命令
    tc qdisc del dev $network_adapter root
}

function CPU_limiting {
    #输入提示
    read -p "Please input CPU limiting numbers: " CPU_numbers
    #使n个CPU利用率达到100%
    stress -c $CPU_numbers >/dev/null 2>&1 &
}

function MEM_limiting {
    #输入提示
    read -p "Please input process numbers: " process_numbers
    read -p "Please input limiting MEM numbers(M) of per process: " MEM_numbers
    MEM_numbers_=$MEM_numbers"M"
    #起几个进程，每个进程占n M的内存
    stress --vm $process_numbers --vm-bytes $MEM_numbers_ --vm-keep >/dev/null 2>&1 &
}

function status {
    echo "======限流状态======"
        tc -s qdisc ls dev $network_adapter

    echo "======限CPU状态======"
    ps -ef|grep stress |grep -v grep |grep c
    if [ $? -ne 0 ]; then
            echo "CPU没限制"
    fi

    echo "======限内存状态======"
    ps -ef|grep stress |grep -v grep |grep vm
    if [ $? -ne 0 ]; then
                echo "内存没限制"
        fi

    echo "======tips======"
    echo "pkill -9 stress 或 kill -9 PID 可解除CPU和内存限制"
    echo "限流倒计时结束，限制也解除"
}

case "$1" in
"Net_speed_limiting")
        Net_speed_limiting 
        ;;
"CPU_limiting")
        CPU_limiting 
        ;;
"MEM_limiting")
        MEM_limiting 
        ;;
"status")
        status
        ;;
"" |*)
        echo "Usage: $0 [ Net_speed_limiting | CPU_limiting | MEM_limiting | status ]"; echo ""
        ;;
esac

exit 0