概述

CentOS 安装后，需要对网络，dns等进行配置。

配置网络

ONBOOT是指明在系统启动时是否激活网卡，只有在激活状态的网卡才能去连接网络，进行网络通讯

cd /etc/sysconfig/network-scripts

vi ifcfg-enp0s3  //ONBOOT改成yes

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=enp0s3
UUID=38f7d015-94e8-4387-b440-4347a4218129
DEVICE=enp0s3
ONBOOT=yes

重启网络

service network restart

配置DNS

检查NetworkManager状态

systemctl status NetworkManager.service
â—� NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: **active (running)** since Tue 2020-12-08 16:38:44 CST; 56min ago
     Docs: man:NetworkManager(8)
 Main PID: 618 (NetworkManager)
   CGroup: /system.slice/NetworkManager.service
          |——618 /usr/sbin/NetworkManager --no-daemon
          |——657 /sbin/dhclient -d -q -sf /usr/libexec/nm-dhcp-helper -pf /var/run/dhclient-enp0s3.pid -lf /var/lib/NetworkManager/dhclient-38f7d015-94e8-...

Dec 08 16:38:50 localhost.localdomain NetworkManager[618]: <info>  [1607416730.9761] device (enp0s3): Activation: successful, device activated.
Dec 08 16:38:50 localhost.localdomain NetworkManager[618]: <info>  [1607416730.9765] manager: startup complete
Dec 08 16:38:50 localhost.localdomain NetworkManager[618]: <info>  [1607416730.9768] manager: NetworkManager state is now CONNECTED_GLOBAL
Dec 08 16:38:54 localhost.localdomain dhclient[663]: XMT: Info-Request on enp0s3, interval 7990ms.
Dec 08 16:39:02 localhost.localdomain dhclient[663]: XMT: Info-Request on enp0s3, interval 16420ms.
Dec 08 16:39:18 localhost.localdomain dhclient[663]: XMT: Info-Request on enp0s3, interval 33000ms.
Dec 08 16:39:32 localhost.localdomain NetworkManager[618]: <warn>  [1607416772.6475] dhcp6 (enp0s3): request timed out
Dec 08 16:39:32 localhost.localdomain NetworkManager[618]: <info>  [1607416772.6475] dhcp6 (enp0s3): state changed unknown -> timeout
Dec 08 16:39:32 localhost.localdomain NetworkManager[618]: <info>  [1607416772.6486] dhcp6 (enp0s3): canceled DHCP transaction, DHCP client pid 663
Dec 08 16:39:32 localhost.localdomain NetworkManager[618]: <info>  [1607416772.6486] dhcp6 (enp0s3): state changed timeout -> done

检查NetworkManager网络管理接口

[root@localhost network-scripts]# nmcli dev status
DEVICE  TYPE      STATE      CONNECTION 
enp0s3  ethernet  connected  enp0s3     
lo      loopback  unmanaged  --         

检查NetworkManager网络连接

[root@localhost network-scripts]# nmcli connection show
NAME    UUID                                  TYPE      DEVICE 
enp0s3  38f7d015-94e8-4387-b440-4347a4218129  ethernet  enp0s3 

设置dns

nmcli con mod enp0s3 ipv4.dns "114.114.114.114 8.8.8.8"

dns生效

nmcli con up enp0s3 

查看resolv.conf文件

[root@localhost network-scripts]# vi /etc/resolv.conf 
# Generated by NetworkManager
nameserver 172.20.10.1
nameserver 114.114.114.114
nameserver 8.8.8.8

配置 hosts

172.20.10.3 www.myhost.com

关闭防火墙

一些软件如集群之间需要打开固定的端口，防止连接不上，先关闭防火墙

[root@localhost network-scripts]# systemctl stop firewalld.service
[root@localhost network-scripts]# systemctl disable firewalld.service

配置 yum 工具

yum clean all
# 生成缓存，安装的时候从缓存中查询相关数据，提高安装速度
yum makecache

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.tuna.tsinghua.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
base                                                                                                                                  | 3.6 kB  00:00:00     
extras                                                                                                                                | 2.9 kB  00:00:00     
updates                                                                                                                               | 2.9 kB  00:00:00     
(1/6): extras/7/x86_64/filelists_db                                                                                                   | 224 kB  00:00:00     
(2/6): base/7/x86_64/filelists_db                                                                                                     | 7.2 MB  00:00:02     
(3/6): extras/7/x86_64/other_db                                                                                                       | 134 kB  00:00:15     
(4/6): updates/7/x86_64/other_db                                                                                                      | 226 kB  00:00:15     
(5/6): updates/7/x86_64/filelists_db                                                                                                  | 2.1 MB  00:00:16     
(6/6): base/7/x86_64/other_db                                                                                                         | 2.6 MB  00:00:16     
Metadata Cache Created

安装jdk1.8

[root@localhost yum.repos.d]# yum list|grep jdk
java-1.8.0-openjdk.i686                     1:1.8.0.272.b10-1.el7_9    updates  
java-1.8.0-openjdk.x86_64                   1:1.8.0.272.b10-1.el7_9    updates  

[root@localhost yum.repos.d]# yum install -y java-1.8.0-openjdk.x86_64