Linux 7 Failed to start LSB: Bring up/down net

OS환경 : Oracle Linux 7.6 (64bit)

 

에러 : Failed to start LSB: Bring up/down net

ifconfig 시 network 정보가 나오지 않아서 network를 재기동 하려할때 발생한 메세지

 

 

현재 네트워크 상태 확인

# ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 21  bytes 2185 (2.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 21  bytes 2185 (2.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo(loopback)만 있고 public network가 나오지 않음

 

network 기동

# systemctl start network
Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.

systemctl status network.service 명령을 사용하라고 나옴

 

 

systemctl status network.service 명령 사용해서 상태확인

# systemctl status network.service
?? network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2022-02-14 14:53:27 KST; 8s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 10158 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
 
Feb 14 14:53:27 oel19db1 network[10158]: RTNETLINK answers: File exists
Feb 14 14:53:27 oel19db1 network[10158]: RTNETLINK answers: File exists
Feb 14 14:53:27 oel19db1 network[10158]: RTNETLINK answers: File exists
Feb 14 14:53:27 oel19db1 network[10158]: RTNETLINK answers: File exists
Feb 14 14:53:27 oel19db1 network[10158]: RTNETLINK answers: File exists
Feb 14 14:53:27 oel19db1 network[10158]: RTNETLINK answers: File exists
Feb 14 14:53:27 oel19db1 systemd[1]: network.service: control process exite...=1
Feb 14 14:53:27 oel19db1 systemd[1]: Failed to start LSB: Bring up/down net...g.
Feb 14 14:53:27 oel19db1 systemd[1]: Unit network.service entered failed state.
Feb 14 14:53:27 oel19db1 systemd[1]: network.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

에러 발생

 

 

해결 방법 : NetworkManager stop 후 disable 후 network 재기동

기존 이더넷 값 확인

# cd /etc/sysconfig/network-scripts/
# ls -al ifcfg-*
-rw-r--r--  1 root root 350 Mar  4  2020 ifcfg-ens32
-rw-r--r--  1 root root 199 Mar  4  2020 ifcfg-ens35
-rw-r--r--. 1 root root 254 Aug 24  2018 ifcfg-lo
# cat ifcfg-ens32 
HWADDR=00:0C:29:D3:6D:16
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens32
DEVICE=ens32
ONBOOT=yes
IPADDR=192.168.137.10
PREFIX=24
GATEWAY=192.168.137.2
DNS1=168.126.63.1
IPV6_PRIVACY=no
 
# cat ifcfg-ens35 
HWADDR=00:0C:29:D3:6D:20
TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
IPADDR=10.10.10.10
PREFIX=24
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
NAME=ens35
ONBOOT=yes
DEVICE=ens35

모두 정상

 

 

NetworkManager 정지

# systemctl stop NetworkManager

 

 

NetworkManager 비활성화

# systemctl disable NetworkManag

 

 

network 재기동

# systemctl restart network

 

 

network 상태 확인

# ifconfig
ens32: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.137.10  netmask 255.255.255.0  broadcast 192.168.137.255
        inet6 fe80::20c:29ff:fed3:6d16  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:d3:6d:16  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 13  bytes 946 (946.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
ens35: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.10.10.10  netmask 255.255.255.0  broadcast 10.10.10.255
        inet6 fe80::20c:29ff:fed3:6d20  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:d3:6d:20  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 15  bytes 1070 (1.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 21  bytes 2185 (2.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 21  bytes 2185 (2.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

정상화됨

 

 

*다시 NetworkManager을 enable하고 reboot 하면 network 가 또 사라지기때문에 disable 상태 유지

 

 

원인 : NetworkManager 문제로 보임

현재 정확한 원인은 알수없음

 

 

참조 : https://nowordeath.tistory.com/134