linux下面安装软件

yum install 

rpm -ivh 

编译安装

三部曲：./configure make make install

卸载  

rpm -e

1）通过yum安装软件 需要你联网

通过ping 命令测试是否联网

2) 更改系统的yum源 阿里云

#https://opsx.alibaba.com/mirror 来源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

1.更改系统的yum源
#阿里云 mirrors.aliyun.com
https://opsx.alibaba.com/mirror

#清华
https://mirrors.tuna.tsinghua.edu.cn/help/centos/

#网易
http://mirrors.163.com/.help/centos.html

3)安装常用软件

yum install -y tree bash-completion wget vim   #  bash-completion命令    参数补全工具  wget 相当于迅雷一样  #vim类似 notepad++

4)关闭SElinux

2.关闭SElinux
rpm -qa
#-qa query all
rpm -qa

1#永久 修改配置文件 重启服务器之后生效

# enforcing - 已开启 正在运行
# permissive - selinux关闭 警告提示
# disabled - 彻底关闭

5)关闭防火墙

systemctl 管理服务
如何关闭防火墙
systemctl stop firewalld
systemctl disable firewalld

getenforce

systemctl status firewalld
systemctl is-active firewalld
systemctl is-enabled firewalld

systemctl enable firewalld.service

6)检查crond状态

[root@oldboyedu-s8 ~]# rpm -qa cronie
cronie-1.4.11-17.el7.x86_64
[root@oldboyedu-s8 ~]# systemctl is-active crond.service
active
[root@oldboyedu-s8 ~]# systemctl is-enabled crond.service
enabled