CentOS7 설치 후 할 일 몇가지

1. virbr0 제거

1) 서비스 중지

# systemctl stop libvirtd.service 

 

2) 서비스 비활성화

# systemctl disable libvirtd.service 

 

3) 인터페이스 확인

# brctl show

bridge name     bridge id               STP enabled     interfaces
virbr0          8000.5254001aead9       yes             virbr0-nic

 

4) 인터페이스 다운

# ip link set virbr0 down

 

5) 인터페이스 삭제

# brctl delbr virbr0

또는

# ip link delete virbr0

 

6) 인터페이스 확인

# brctl show

bridge name     bridge id               STP enabled     interfaces

 

2. virbr0-nic 삭제

1) link 확인

# ip link show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 00:50:56:b8:d0:4a brd ff:ff:ff:ff:ff:ff
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 52:54:00:1a:ea:d9 brd ff:ff:ff:ff:ff:ff

 

2) link 삭제

# ip link delete virbr0-nic

 

3) link 확인

# ip link show 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens192: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 00:50:56:b8:d0:4a brd ff:ff:ff:ff:ff:ff

 

 

3. ipv6 제거

1) 상태 확인 (0=ipv6 사용, 1=ipv6 사용 안함)

# sysctl net.ipv6.conf.all.disable_ipv6

net.ipv6.conf.all.disable_ipv6 = 0

 

# ifconfig -a | grep inet

        inet 192.168.0.991  netmask 255.255.255.192  broadcast 192.168.0.999
        inet6 fe80::250:56ff:feb8:d04a  prefixlen 64  scopeid 0x20<link>

 

2) ipv6 사용 안함으로 설정

# sysctl net.ipv6.conf.all.disable_ipv6=1

net.ipv6.conf.all.disable_ipv6=1

 

3) 확인

# sysctl net.ipv6.conf.all.disable_ipv6

net.ipv6.conf.all.disable_ipv6 = 1

 

# ifconfig -a | grep inet

        inet 192.168.0.991  netmask 255.255.255.192  broadcast 192.168.0.999