Centos 常见操作

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一、程序安装

1. re|sz上传下载命令

//1.安装
yum -y install lrzsz 

//2.上传
rz

//3.下载
sz [文件名]

2. JDK安装

• JDK8：
  https://www.cnblogs.com/wandoupeas/p/centos_jdk_install.html

• JDK11：
  https://www.cnblogs.com/biem/p/13307438.html

• JDK14：
  上传安装包到 /data/java

  //安装jdk14
  tar -xzvf jdk-14.0.2_linux-x64_bin.tar.gz
  

3. unzip 解压命令

https://blog.youkuaiyun.com/wxyjuly/article/details/79398559

4.git安装

https://www.cnblogs.com/jhxxb/p/10571227.html

5. Telnet安装

https://www.cnblogs.com/sjpv/p/11812238.html

6. dstat命令安装

https://www.cnblogs.com/shoufeng/p/9739805.html

7. iostat安装及使用

https://www.cnblogs.com/architectforest/p/12628399.html

iostat -xmt 1
Key fields from iostat:
%util: this is the most useful field for a quick check, it indicates what percent of the time the device/drive is in use.
avgrq-sz: average request size. Smaller number for this value reflect more random IO operations.

8. wget命令安装

yum -y install wget

9. crul安装

yum -y install curl

二、环境配置

1. 防火墙端口

https://www.cnblogs.com/heqiuyong/p/10460150.html

//1.查看防火墙所有开放的端口
firewall-cmd --zone=public --list-ports

//2.开发端口
firewall-cmd --zone=public --add-port=27017/tcp --permanent

//3.生效
firewall-cmd --reload

//4 查看端口
netstat -lnpt
//查看指定端口
netstat -lnpt |grep 5672

2. 连接数设置

https://blog.youkuaiyun.com/hunhun1122/article/details/79391147?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight

3. 网络超时设置

https://segmentfault.com/a/1190000021057175
https://docs.mongodb.com/v3.6/faq/diagnostics/#adjusting-the-tcp-keepalive-value

//使网络超时设置5分钟，超时后检测3次，每次30秒
vim /etc/sysctl.conf
//加入如下内容
net.ipv4.tcp_keepalive_time=300
net.ipv4.tcp_keepalive_intvl=30
net.ipv4.tcp_keepalive_probes=3

sysctl -p
sysctl -a | grep keepalive

三、命令参考

1. java cpu、内存分析命令

https://www.cnblogs.com/wu-wu/p/11923250.html

2. top命令详细

https://blog.youkuaiyun.com/xujiamin0022016/article/details/89072116

3. tar解压缩

// 1.打包压缩目录
tar -czvf kdnn_hall_20201209.tar.gz kdnn_hall_20201209121360/

4. 目录文件操作

// 1.删除backups目录30天之前修改的文件
find backups/ -mtime +30 -delete