centos7 foundation environment configuration

1. Install the supplementary packages
   yum -y install wget vim lrzsz bash- completion telnet nmap
   Note:
   After installation is complete, log it again, or automatically fill all orders not take effect
2. Close SELinux:
   / etc / SELinux / config
3. Turn off the firewall

• STOP firewalld.service systemctl
  the Active: inactive (Dead) Operating since 2019-10-17 23 is Thu: 59: display off. 4
  [root @ oldboy-c ~] # systemctl disable firewalld.service firewall switched off automatically start
  Removed symlink / etc / systemd /system/multi-user.target.wants/firewalld.service.
  Removed The symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

1. Firewall boot from the start to close

• [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 view the port open
3. ss -ant
   modify hostname
   / etc / hostname configuration file
   hostname set-hostname oldboy temporary and permanent modify the host name
   to modify the character set
   localectl set-locale LANG = zh_CN.UTF- 8
   view version
   [root @ oldboy-c ~] # cat / etc / OS-Release
   NAME = "the CentOS the Linux"
   VERSION = ". 7 (Core)"
   ID = "CentOS"
   ID_LIKE = "RHEL Fedora"
   VERSION_ID = ". 7"
   PRETTY_NAME = "the CentOS the Linux. 7 (Core)"
   ANSI_COLOR = "0; 31 is "
   CPE_NAME =" CPE: / O: CentOS: CentOS:. 7 "
   HOME_URL to =" 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"

Modify the file from the start, you need to add execute permissions

to view and modify the run level