centos7基础环境配置

1. 先安装补充软件包
   yum -y install wget vim lrzsz bash-completion telnet nmap
   注意：
   安装完成后，请重新登录一下，否则自动补全命令无法生效
2. 关闭selinux:
   /etc/selinux/config
3. 关闭防火墙

• systemctl stop firewalld.service
  Active: inactive (dead) since Thu 2019-10-17 23:59:4 显示关闭
  [root@oldboy-c ~]# systemctl disable firewalld.service 关闭防火墙开机自动启
  Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
  Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

1. 防火墙开机自启动关闭

• [root@oldboy-c ~]# systemctl status firewalld.service
  ● firewalld.service - firewalld - dynamic firewall daemon
  Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
  Active: inactive (dead) 当前是否在启动
  Docs: man:firewalld(1)

Oct 17 23:08:45 oldboy-c systemd[1]: Starting firewalld - dynamic firewall daemon...
Oct 17 23:08:48 oldboy-c systemd[1]: Started firewalld - dynamic firewall daemon.
网络相关命令

1. 显示网卡
   [root@oldboy-c ~]# ip a show eth0
   2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
   link/ether 00:0c:29:52:6a:2e brd ff:ff:ff:ff:ff:ff
   inet 10.0.0.201/24 brd 10.0.0.255 scope global noprefixroute eth0
   valid_lft forever preferred_lft forever
   inet6 fe80::f4f5:94d1:6970:8364/64 scope link noprefixroute
   valid_lft forever preferred_lft forever
2. ss -lntup 查看端口开启
3. ss -ant
   修改hostname
   /etc/hostname 配置文件
   hostname set-hostname oldboy 临时加永久修改主机名
   修改字符集
   localectl set-locale LANG=zh_CN.UTF-8
   查看版本
   [root@oldboy-c ~]# cat /etc/os-release
   NAME="CentOS Linux"
   VERSION="7 (Core)"
   ID="centos"
   ID_LIKE="rhel fedora"
   VERSION_ID="7"
   PRETTY_NAME="CentOS Linux 7 (Core)"
   ANSI_COLOR="0;31"
   CPE_NAME="cpe:/o:centos:centos:7"
   HOME_URL="https://www.centos.org/"
   BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

修改自启动的文件，需要加执行权限

查看和修改运行级别