linux常用命令总结

Posted 2021-09-12 伟0rn7h

内存 cpu查看

free -h  以合适内存单位显示内存情况

free -s 数字 每几秒刷新内存显示

top   按e切换显示单位

防火墙

centos7

查看防火墙状态

firewall-cmd --state

停止firewall

systemctl stop firewalld.service

禁止firewall开机启动

systemctl disable firewalld.service 

端口转发

开启内核转发
vim /etc/sysctl.conf
net.ipv4.ip_forward=1

保存后，使修改内容生效
sysctl -p



中转服务器(IP 2.2.2.2)    目标服务器(IP 1.1.1.1)
iptables -t nat -A PREROUTING -p tcp --dport 4000 -j DNAT --to-destination 1.1.1.1:4000
iptables -t nat -A PREROUTING -p udp --dport 4000 -j DNAT --to-destination 1.1.1.1:4000
iptables -t nat -A POSTROUTING -p tcp -d 1.1.1.1 --dport 4000 -j SNAT --to-source 2.2.2.2
iptables -t nat -A POSTROUTING -p udp -d 1.1.1.1 --dport 4000 -j SNAT --to-source 2.2.2.2


service iptables save
service iptables restart

docker安装

curl -fsSL get.docker.com -o get-docker.sh && sh get-docker.sh --mirror Aliyun&&systemctl enable docker&&systemctl start docker

docker-compose安装

最新版本号自行查看：https://github.com/docker/compose/releases

curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose 

chmod +x /usr/local/bin/docker-compose

docker下安装oracle数据库，以及导入导出数据

docker安装oracle参考
docker-compose.yml文件

version: \'3.1\'
services:
  oracle:
    image: jaspeen/oracle-xe-11g
    container_name: oracle11g
    privileged: true
    environment:
      - TZ=Asia/Shanghai
      - ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_2
    volumes:
      - ./data:/u01/app/oracle
    ports:
      - 1521:1521
    restart: always

-- 创建表空间
 create tablespace qxjnew
   datafile \'/u01/app/oracle/oradata/XE/qxjnew.dbf\'
   size 1000M
   autoextend on;

-- 创建用户 默认表空间
create user qxjnew identified by password default tablespace qxjnew;
alter user qxjnew default tablespace ytj_data;
-- dba权限
grant  dba  to qxjnew;
-- 删除表空间
drop tablespace test2 including contents and datafiles;
-- 删除用户
drop user flww cascade;



-- 进入docker
docker exec -it oracle11g bash
-- 切换到oracle用户
 su - oracle
-- 导出某个用户下数据 dmp文件   
exp flww/password@ip:port:XE file=./flwwback.dmp log=./flwwback.log owner=flww
-- 导入数据库
imp test2/password@XE file=./flwwback.dmp full=y ignore=y

window杀死某个端口进程

tasklist | findstr 2000

taskkill -PID 进程号 -F //强制关闭某个进程

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