centos7+virtualbox設置靜態ip的-無效果-重啓路由器，ok

默認路徑爲：

/etc/sysconfig/network-scripts/ifcfg-enp0s3

之前安裝的時候，設置是好的，不知爲何過了一段時間就無效果了。

在centos7下 獲得mac的值。

在CentOS7下獲取Mac地址的值

[root@localhost shell]# ifconfig eth0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.2.10  netmask 255.255.255.0  broadcast 192.168.2.255

        inet6 fe80::20c:29ff:fed7:8537  prefixlen 64  scopeid 0x20<link>

        ether 00:0c:29:d7:85:37  txqueuelen 1000  (Ethernet)

        RX packets 137188  bytes 184028883 (175.5 MiB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 42678  bytes 3437016 (3.2 MiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

 

 

[root@localhost shell]# ifconfig eth0 |egrep "ether" 

        ether 00:0c:29:d7:85:37  txqueuelen 1000  (Ethernet)

[root@localhost shell]# ifconfig eth0 |egrep "ether" |awk '{print $2}'

00:0c:29:d7:85:37

[root@localhost shell]# 

嘗試方式2:

[root@CentOS7x64 ~]# getenforce

setenforce 0

虛擬機器中，配置了靜態ip 但是 允許1分鐘後就自動消失了，

採用ipconfig 查看，發現ip丟失了。

又重啓了 service network restart後就又有了ip。但是，過不了多久，繼續丟失這類現象。

--解決方案：將設置成了HOst-only 模式。

缺點：無法上網。

採用方式，重新安裝一個新的續集，看是否可以通過“網絡橋接‘進行上網。

---

vi /etc/sysconfig/network-scripts/ifcfg-eno16777736裏面的name和device，並把配置文件名改爲ifcfg-eth0。重啓網絡：systemctl restart network.service。後來因重啓失敗還原爲原來的信息，以爲會正常，但仍沒有解決。

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

根據提示查看網卡信息
# systemctl status network.service

查看日誌
# cat /var/log/messages |grep network
Jul  4 10:05:10 dg-p systemd: Starting LSB: Bring up/down networking...
Jul  4 10:05:10 dg-p network: Bringing up loopback interface:  Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jul  4 10:05:10 dg-p network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jul  4 10:05:10 dg-p network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jul  4 10:05:10 dg-p network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo'
Jul  4 10:05:10 dg-p network: [  OK  ]
Jul  4 10:05:11 dg-p network: Bringing up interface eno16777736:  Error: Connection activation failed: No suitable device found for this connection.
Jul  4 10:05:11 dg-p network: [FAILED]
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p network: RTNETLINK answers: File exists
Jul  4 10:05:11 dg-p systemd: network.service: control process exited, code=exited status=1
Jul  4 10:05:11 dg-p systemd: Failed to start LSB: Bring up/down networking.
Jul  4 10:05:11 dg-p systemd: Unit network.service entered failed state.
Jul  4 10:05:11 dg-p systemd: network.service failed.

解決：
百度後很多說是MAC地址或者NetworkManager服務的問題，試過後仍未解決。解鈴還須繫鈴人，試着修改網卡名---
（1）修改網卡名和配置文件
# mv /etc/sysconfig/network-scripts/ifcfg-eno16777736 /etc/sysconfig/network-scripts/ifcfg-eth0
修改配置文件裏面name和device
# vi /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
BOOTPROTO=static 實際我配置的是dch
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=eth0
UUID=d890d6e6-01f6-4063-bf70-cd4e1787d0a8
HWADDR=00:50:56:8b:57:82             #這裏原文件沒有，手動添加上去
DEVICE=eth0
ONBOOT=yes
#IPADDR=192.168.70.42--我沒有配置，自動獲取的
#NETMASK=255.255.255.0
#GATEWAY=192.168.70.254
（2）修改/etc/sysconfig/grub，添加net.ifnames=0 biosdevname=0
# vi  /etc/sysconfig/grub 
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 rd.lvm.lv=centos/root rd.lvm.lv=centos/swap net.ifnames=0 biosdevname=0rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
（3）手動生成70-persistent-net.rules以及其他方法
查看接口的MAC地址
# ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eno16777728: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 00:0c:29:28:ac:54 brd ff:ff:ff:ff:ff:ff
生成文件
# vi /etc/udev/rules.d/70-persistent-net.rules
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:28:ac:54", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

或

#grub2-mkconfig -o /boot/grub2/grub.cfg            #這個沒有試過，有興趣的可以自己試試

重啓機器:
# reboot
---嘗試效果：：：不行。失敗了。

大招：

重啓了我路由器，一切都可以了。

總共花費了2天時間。