Linux记录-一些常用操作

1.查杀三天前的进程

ps -ef|grep 进程名 |grep `date +"%b%d" --date '2 days ago'`|awk '{print $2}'|xargs kill -9

2.配置jdk

export JAVA_HOME=/usr/jdk/jdk1.8.0_192
export JRE_HOME=/usr/jdk/jdk1.8.0_192/jre
export CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

3.新建用户

groupadd -g 6000 apps
useradd -s /bin/bash -G apps -m app
echo "Apps@123" | passwd ‐‐stdin "app"

4.selinux
sed -i '/^SELINUX/s/=.*/=disabled/' /etc/selinux/config
setenforce 0
5.sudo
vim /etc/sudoers.d/app
app ALL=(ALL) ALL
app ALL=(ALL) NOPASSWD: ALL
Defaults !env_reset
6.免密
su app
ssh-keygen -t rsa
cat ~/.ssh/id_rsa.pub >> /home/app/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

合并id_rsa.pub到authorized_keys

7.划分磁盘
查看分区（fdisk -l，没有Start-End磁盘分区表示可用）
添加分区（fdisk /dev/vdb n p 回车 回车 w）
查看新建的分区（fdisk -l）
格式化分区：mkfs.ext4 /dev/vdb1
新建目录mkdir /data，并挂载分区（mount /dev/vdb1 /data）
永久写入磁盘：将分区信息写入/etc/fstab: echo '/dev/vdb1 /data ext4 defaults 0 0' >> /etc/fstab

8.修改swap大小
cd /data
dd if=/dev/zero of=/data/swapfile128G bs=1024 count=134217728
mkswap /data/swapfile128G
swapon /data/swapfile128G
cat /proc/swaps
echo '/data/swapfile128G swap swap defaults 0 0' >> /etc/fstab

9.关闭swap
swapoff -a
echo 0 >/proc/sys/vm/swappiness
echo 'vm.swappiness=0' >> /etc/sysctl.conf

10.检测服务是否存在

 

#!/bash/sh

#Check if the fate service exists


set -e

service_name=$1
port=$2

check_port() {
        /usr/sbin/lsof -i:$port | grep -i "listen"
}

#check is not exist
check_isnotExist(){
    if check_port $port
    then
        value=0
        echo $service_name "is running" 
    else
       value=1
       echo $service_name "is dead"
    fi
    echo "{"$service_name","$value"}"
}

if [[ $2 == "" ]]
then
 echo "usage: $0 {mysql|redis} {port}"
else
case "$1" in
    mysql)
        check_isnotExist
        ;;
    redis)
        check_isnotExist
        ;;
    *)
        
     echo "usage: $0 {mysql|redis} {port}"
     exit -1
esac
fi

 

11.find操作

job_date=`date '+%Y'`

find $dir/$job_date* -mtime +2 -type d -maxdepth 1 -exec rm -rf {} ;  --删除两天前文件

find $dir/$job_date* -mtime +2 -type f ! -name "*txt*" -exec rm -rf {} ; --删除两天前不包括txt的文件

12.获取cpu  内存  io

us=`top -b -n1 | grep %Cpu | tail -1  | awk -F ":" '{print $2}' | awk -F "," '{print $1}' | awk -F " " '{print $1}'`
sy=`top -b -n1 | grep %Cpu | tail -1  | awk -F ":" '{print $2}' | awk -F "," '{print $2}' | awk -F " " '{print $1}'`
ni=`top -b -n1 | grep %Cpu | tail -1  | awk -F ":" '{print $2}' | awk -F "," '{print $3}' | awk -F " " '{print $1}'`
id=`top -b -n1 | grep %Cpu | tail -1  | awk -F ":" '{print $2}' | awk -F "," '{print $4}' | awk -F " " '{print $1}'`
wa=`top -b -n1 | grep %Cpu | tail -1  | awk -F ":" '{print $2}' | awk -F "," '{print $5}' | awk -F " " '{print $1}'`
echo "===cpu使用占比统计==="
echo "用户使用cpu%:" $us
echo "系统使用cpu%:" $sy
echo "用户优先级使用cpu%:" $ni
echo "空闲占比cpu%:" $id
echo "等待输入输出cpu%:" $wa

total=`free -m | grep "Mem" | awk -F ":" '{print $2}'  |  awk -F " " '{print $1}'`
used=`free -m | grep "Mem" | awk -F ":" '{print $2}'  |  awk -F " " '{print $2}'`
free=`free -m | grep "Mem" | awk -F ":" '{print $2}'  |  awk -F " " '{print $3}'`
shared=`free -m | grep "Mem" | awk -F ":" '{print $2}'  |  awk -F " " '{print $4}'`
cache=`free -m | grep "Mem" | awk -F ":" '{print $2}'  |  awk -F " " '{print $5}'`
available=`free -m | grep "Mem" | awk -F ":" '{print $2}'  |  awk -F " " '{print $6}'`
echo "===内存使用统计==="
echo "总分配内存（m）:" $total
echo "已使用内存（m）:" $used
echo "已使用内存占比（%）:" `echo "scale=2;$used/$total*100" |bc`%
echo "空闲内存（m）" $free
echo "共享内存（m）:" $shared
echo "磁盘缓存（m）:" $cache
echo "可用内存（m）:" $available

#!/bash/sh

set -e 

root_total=`df -TH / | tail -1 | awk '{print $3}'`
data_total=`df -TH /data | tail -1 | awk '{print $3}'`
root_used=`df -TH / | tail -1 | awk '{print $6}'`
root_used=`df -TH / | tail -1 | awk '{print $6}'`
data_used=`df -TH /data | tail -1 | awk '{print $6}'`
echo "===磁盘使用统计==="
echo "根目录磁盘大小（G）:" $root_total
echo "根目录使用（%）:" $root_used
echo "data分区磁盘大小（G）:" $data_total
echo "data分区使用（%）:" $data_used


echo "===磁盘io输入/输出操作花费统计==="
disk_name=($(cat /proc/diskstats | awk -F " " '{print $3}'))
disk_time=($(cat /proc/diskstats | awk -F " " '{print $13/$14}'))
number=1000
for((i=0;i<${#disk_name[@]};i++))
do
  for((j=0;j<${#disk_time[@]};j++))
  do
    if [[ $i -eq $j ]] 
    then
       echo "磁盘"${disk_name[i]}"分区输入/输出操作花费的时间是(%):" `echo "scale=2;${disk_time[j]}*100/1" |bc`%
    fi
  done
done

13. 限速

#!/bin/bash
set -e 

speed=9mbit
iplist=(10.0.0.10)

sudo yum install net-tools -y
sudo tc qdisc add dev eth0 root handle 1: htb r2q 1
sudo tc class add dev eth0 parent 1: classid 1:1 htb rate $speed ceil $speed
for ip in ${iplist[@]}
do
  sudo tc filter add dev eth0 parent 1: protocol ip prio 16 u32 match ip dst $ip flowid 1:1
done
sudo yum install iftop -y
sudo iftop -i eth0

 14.时间计算

#!/bin/bash

#clean jobs

set -e



check_xxx(){
 xxx
}

a_list=($(xxx))

for a_id in ${a_list[@]}
do
    aa_id=$(xxx | awk -F '"' '{print $4}' | awk 'NR==1{print $1}')
    ab=$(xxx | grep "xxx" | grep -v "xxx" | awk -F '"' '{print $4}' | awk 'NR==1{print $1}' )
    cd xxx
    log_time=$(tail -1 INFO.log | awk -F' ' '{ print $1 " " substr($2,0,8)}' | sed 's/"//g')
    current_time=`date '+%Y-%m-%d %H:%M:%S'`
    days=$(python date_diff.py  $current_time $log_time | awk 'NR==1{print $1}')
    hours=$(python date_diff.py  $current_time $log_time | awk 'NR==2{print $1}')
    if [[ $days -eq 0 ]]
    then
        if [[ $hours -gt 2 ]]
        then
           xxx
        fi
    else
        xxx
    fi
done



# -*- coding: utf-8 -*-  

import sys
from datetime import datetime
import time

current_time=sys.argv[1]+" "+sys.argv[2]
log_time=sys.argv[3]+" "+sys.argv[4]

format = '%Y-%m-%d %H:%M:%S'
a = datetime.strptime(log_time, format)
b = datetime.strptime(current_time, format)
t1 = time.mktime(a.timetuple()) * 1000 + a.microsecond / 1000
t2 = time.mktime(b.timetuple()) * 1000 + b.microsecond / 1000
a = t2-t1
b = a/1000/3600
c = int(b/24)
d = int(b%24)
print(c)
print(d)