CentOS7 네트워크 설정하기

 

 

CentOS7을 처음 설치하게 되면 설치 조건에 따라 종종 net-tools 패키지가 설치되지 않는 경우가 있다.

 

이럴경우 기존 CentOS6 이하 버전에서 사용되던 ifconfig등의 명령어를 수행할 수 없어 network 설정에 있어 어려움이 있을 수 있다.

 

CentOS7 버전부터는 NetworkManager 서비스를 기본 네트워크 관리 서비스로 채용하고 있으며 설정 방법은 아래와 같다.

 

 

1.  NetworkManager 서비스 기동여부 확인

 

 

 

[root@centos7 /]# [root@centos7 /]# systemctl status NetworkManager NetworkManager.service - Network Manager    Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled)    Active: active (running) since Fri 2015-01-02 13:44:52 KST; 2min 16s ago  Main PID: 824 (NetworkManager)    CGroup: /system.slice/NetworkManager.service            └─824 /usr/sbin/NetworkManager --no-daemon [root@centos7 /]# [root@centos7 /]#

 

 

2. NetworkManager 서비스가 기동되어 있지 않을경우 아래와 같이 기동

 

[root@centos7 ~]# [root@centos7 ~]# systemctl list-unit-files | grep NetworkManager dbus-org.freedesktop.NetworkManager.service enabled NetworkManager-dispatcher.service           enabled NetworkManager-wait-online.service          disabled NetworkManager.service                      disabled [root@centos7 ~]# [root@centos7 ~]# [root@centos7 ~]# systemctl enable NetworkManager.service [root@centos7 ~]# [root@centos7 ~]# systemctl start NetworkManager.service [root@centos7 ~]# [root@centos7 ~]# systemctl status NetworkManager.service NetworkManager.service - Network Manager    Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled)    Active: active (running) since Fri 2015-01-02 14:59:01 KST; 2h 21min ago  Main PID: 9504 (NetworkManager)    CGroup: /system.slice/NetworkManager.service            ???€9504 /usr/sbin/NetworkManager --no-daemon Jan 02 17:20:36 centos7 systemd[1]: Started Network Manager. [root@centos7 ~]# [root@centos7 ~]#

 

 

3. Network Device 연결 상태 확인하기

 

[root@centos7 /]# [root@centos7 /]# nmcli device DEVICE  TYPE      STATE         CONNECTION enp0s3  ethernet  disconnected  --         lo      loopback  unmanaged     --         [root@centos7 /]# 혹은 아래와 같이 Alias로 옵션수행   [root@centos7 /]# [root@centos7 /]# nmcli d DEVICE  TYPE      STATE         CONNECTION enp0s3  ethernet  disconnected  --         lo      loopback  unmanaged     --         [root@centos7 /]# [root@centos7 /]#

 

 

 

4. 네트워크 Config Script 수동 작성

 

[root@centos7 /]# [root@centos7 /]# cd /etc/sysconfig/network-scripts/ [root@centos7 network-scripts]# [root@centos7 network-scripts]# [root@centos7 network-scripts]# vi ifcfg-enp0s3 TYPE=Ethernet BOOTPROTO=none DEFROUTE=yes IPV4_FAILURE_FATAL=no NAME=enp0s3 UUID=567cbcc2-dd0c-4ea0-af1c-2057b4c4467a ONBOOT=yes HWADDR=08:00:27:19:5C:C6 IPADDR=192.168.137.70 NETMASK=255.255.255.0 GATEWAY=192.168.137.1 DNS1=168.126.63.1 [root@centos7 network-scripts]# [root@centos7 network-scripts]# [root@centos7 network-scripts]# [root@centos7 network-scripts]# vi /etc/sysconfig/network # Created by anaconda NETWORKING=YES HOSTNAME=centos7 GATEWAY=192.168.137.1 [root@centos7 network-scripts]# [root@centos7 network-scripts]# [root@centos7 network-scripts]# vi /etc/resolv.conf # Generated by NetworkManager nameserver 168.126.63.1 [root@centos7 network-scripts]#

 

 

5. Network 서비스 재기동 및 IP 할당 상태 확인

 

[root@centos7 network-scripts]# [root@centos7 network-scripts]# systemctl restart NetworkManager [root@centos7 network-scripts]# [root@centos7 network-scripts]# systemctl restart network [root@centos7 network-scripts]# [root@centos7 network-scripts]# ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00     inet 127.0.0.1/8 scope host lo        valid_lft forever preferred_lft forever     inet6 ::1/128 scope host        valid_lft forever preferred_lft forever 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000     link/ether 08:00:27:19:5c:c6 brd ff:ff:ff:ff:ff:ff     inet 192.168.137.70/24 brd 192.168.137.255 scope global enp0s3        valid_lft forever preferred_lft forever     inet6 fe80::a00:27ff:fe19:5cc6/64 scope link        valid_lft forever preferred_lft forever [root@centos7 network-scripts]# [root@centos7 network-scripts]# [root@centos7 network-scripts]# ping -c 5 -i 0.1 192.168.137.1 PING 192.168.137.1 (192.168.137.1) 56(84) bytes of data. 64 bytes from 192.168.137.1: icmp_seq=1 ttl=128 time=0.305 ms 64 bytes from 192.168.137.1: icmp_seq=2 ttl=128 time=0.206 ms 64 bytes from 192.168.137.1: icmp_seq=3 ttl=128 time=0.231 ms 64 bytes from 192.168.137.1: icmp_seq=4 ttl=128 time=0.265 ms 64 bytes from 192.168.137.1: icmp_seq=5 ttl=128 time=0.094 ms --- 192.168.137.1 ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 403ms rtt min/avg/max/mdev = 0.094/0.220/0.305/0.071 ms [root@centos7 network-scripts]# [root@centos7 network-scripts]# [root@centos7 network-scripts]# [root@centos7 network-scripts]# nslookup google.com Server:  168.126.63.1 Address: 168.126.63.1#53 Non-authoritative answer: Name: google.com Address: 173.194.126.233 Name: google.com Address: 173.194.126.238 Name: google.com Address: 173.194.126.224 Name: google.com Address: 173.194.126.225 Name: google.com Address: 173.194.126.226 Name: google.com Address: 173.194.126.227 Name: google.com Address: 173.194.126.228 Name: google.com Address: 173.194.126.229 Name: google.com Address: 173.194.126.230 Name: google.com Address: 173.194.126.231 Name: google.com Address: 173.194.126.232 [root@centos7 network-scripts]#

 

 

6. Text User Interface 환경으로 설정 (CUI 가 아닌 TUI 환경)

 

[root@centos7 ~]# [root@centos7 ~]# nmtui [root@centos7 ~]# [root@centos7 /]#