[CentOS 8] 초기 세팅 | 네트워크 설정

서버를 이용하기 위해서는 네트워크 설정이 필요하며, 서비스 제공을 위해 기본적으로 고정IP가 필요하다.

 

이번 포스팅에서는 서버간 이름을 지정하는 Hostname 설정과 고정 IP 설정 방법, 사용하지 않는 IPv6를 비활성화하는 방법에 대해 알아보자.

 

1. 초기 세팅 | Hostname 설정

# Hostname 설정
[root@localhost ~]# hostnamectl set-hostname magicpipe

# 설정된 Hostname 확인
[root@localhost ~]# hostname
magicpipe

 

2. 초기 세팅 | 고정 IP 설정

# 서버의 네트워크 인터페이스 확인
[root@localhost ~]# nmcli device
DEVICE      TYPE      STATE      CONNECTION
enp0s3      ethernet  connected  enp0s3
enp0s8      ethernet  connected  enp0s8
lo          loopback  unmanaged  --
virbr0-nic  tun       unmanaged  --

# 고정 IP와 Subnet 설정
[root@localhost ~]# nmcli connection modify enp0s3 ipv4.addresses 10.0.2.101/24

# Gateway IP 설정
[root@localhost ~]# nmcli connection modify enp0s3 ipv4.gateway 10.0.2.1

# DNS IP 설정
[root@localhost ~]# nmcli connection modify enp0s3 ipv4.dns 10.0.2.1

# 고정 IP 사용하기 수동 설정 적용
[root@localhost ~]# nmcli connection modify enp0s3 ipv4.method manual

# 고정 IP 설정한 네트워크 인터페이스 재시작
[root@localhost ~]# nmcli connection down enp0s3; nmcli connection up enp0s3
Connection 'enp0s3' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/1)
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/5)

# 고정 IP 설정 확인
[root@localhost ~]# nmcli device show enp0s3
GENERAL.DEVICE:                         enp0s3
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         08:00:27:D8:9A:B1
GENERAL.MTU:                            1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     enp0s3
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/6
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         10.0.2.101/24
IP4.GATEWAY:                            10.0.2.1
IP4.ROUTE[1]:                           dst = 10.0.2.0/24, nh = 0.0.0.0, mt = 102
IP4.ROUTE[2]:                           dst = 0.0.0.0/0, nh = 10.0.2.1, mt = 102
IP4.DNS[1]:                             10.0.2.1
IP6.ADDRESS[1]:                         fe80::ba7d:47e7:e20a:bdb0/64
IP6.GATEWAY:                            --
IP6.ROUTE[1]:                           dst = fe80::/64, nh = ::, mt = 102
IP6.ROUTE[2]:                           dst = ff00::/8, nh = ::, mt = 256, table=255

# 상태 확인하기
[root@localhost ~]# ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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 fq_codel state UP group default qlen 1000
    link/ether 08:00:27:d8:9a:b1 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.101/24 brd 10.0.2.255 scope global noprefixroute enp0s3
       valid_lft forever preferred_lft forever
    inet6 fe80::ba7d:47e7:e20a:bdb0/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:eb:57:81 brd ff:ff:ff:ff:ff:ff
    inet 192.168.56.107/24 brd 192.168.56.255 scope global dynamic noprefixroute enp0s8
       valid_lft 1094sec preferred_lft 1094sec
    inet6 fe80::2bf0:8265:9997:cb41/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

 

3. IPv6 사용 비활성화 하기

# IPv6 비활성화 설정
[root@localhost ~]# vi /etc/default/grub

# 설정 변경 전 Config
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto resume=/dev/mapper/cl-swap rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
GRUB_ENABLE_BLSCFG=true

# 설정 변경 후 Config
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto ipv6.disable=1 resume=/dev/mapper/cl-swap rd.lvm.lv=cl/root rd.lvm.lv=cl/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
GRUB_ENABLE_BLSCFG=true

# 설정 적용 후 서버 재시작
[root@localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
done
[root@localhost ~]# reboot