VM，VBOX中CentOS 7 配置網卡

咱們常常須要複製VM和VBOX的虛擬機，繞不開的一個步驟是網卡的從新配置。
有時候這個東西特別繁瑣。
這裏記錄一個稍微簡單的操做，沒有udev的設備綁定各類騷操做。。。

一、 新複製的虛擬機，請選擇從新生成MAC地址，這個步驟在複製（克隆，WHATEVER）的時候，或者在複製完成，又或者完成後點配置，網卡屬性，高級屬性（各類平臺各不相同，找到從新生成MAC地址，勾上或者刷新）。記錄下這個MAC地址
二、新虛擬機啓動之後，不管網絡是否正常，停掉NetworkManager.Service...真的沒有那麼好用。
systemctl stop NetworkManager
systemctl disable NetworkManager
三、運行ifconfig -a, 獲得新網卡的網卡名稱，（也是設備名稱，結合剛纔記錄下的MAC地址，很容易對上）
四、到/etc/sysconfig/network-scripts文件夾修改ifcfg-enxxx網卡啓動配置文件
4.一、 強烈建議刪除ifcfg-profile1相似這個腳本，這個是NetManager遺留。
4.二、 用uuidgen enxxx這樣的格式獲得uuid寫入配置檔。
4.三、 寫完配置檔，重啓網卡設備systemctl restart network。若是沒有報錯就完成了。

####舉例：
###配置一個網卡最終要三個要素，設備名，MAC地址，UUID

eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.201  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::20c:29ff:fe4a:b12c  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:4a:b1:2c  txqueuelen 1000  (Ethernet)
        RX packets 3647  bytes 3417904 (3.2 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 142  bytes 18249 (17.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eno33554992: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.199.241  netmask 255.255.255.0  broadcast 192.168.199.255
        inet6 fe80::20c:29ff:fe4a:b136  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:4a:b1:36  txqueuelen 1000  (Ethernet)
        RX packets 5605  bytes 3465915 (3.3 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1400  bytes 322360 (314.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

###uuidgen （注意，UUID每次生成都不一樣，可是每一個生成的ID都是能夠用的）

[root@mysql01 dev]# uuidgen eno16777736
fd32246b-c655-45c6-ab6a-7a6aa84faa72
[root@mysql01 network-scripts]# uuidgen eno33554992
44e70d2f-4bf1-4753-865b-8fb042ecc8d6

設備名	MAC地址	UUID
eno16777736	00:0c:29:4a:b1:2c	fd32246b-c655-45c6-ab6a-7a6aa84faa72
eno33554992	00:0c:29:4a:b1:36	44e70d2f-4bf1-4753-865b-8fb042ecc8d6

###中止NetworkManager

[root@mysql01 network-scripts]# systemctl stop NetworkManager
[root@mysql01 network-scripts]# systemctl disable NetworkManager
Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.

[root@mysql01 network-scripts]# systemctl status NetworkManager
* NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; disabled; vendor preset: enabled)
   Active: inactive (dead) since 日 2020-01-26 14:22:15 CST; 36s ago
 Main PID: 8417 (code=exited, status=0/SUCCESS)

1月 26 14:22:07 mysql01 NetworkManager[8417]: <info>  (eno16777736): Activation: successful, device activated.
1月 26 14:22:07 mysql01 NetworkManager[8417]: <info>  wpa_supplicant running
1月 26 14:22:07 mysql01 NetworkManager[8417]: <info>  (virbr0): device state change: secondaries -> activated (reason 'none...100 0]
1月 26 14:22:07 mysql01 NetworkManager[8417]: <info>  (virbr0): Activation: successful, device activated.
1月 26 14:22:15 mysql01 NetworkManager[8417]: <info>  caught SIGTERM, shutting down normally.
1月 26 14:22:15 mysql01 NetworkManager[8417]: <info>  (virbr0): bridge port virbr0-nic was detached
1月 26 14:22:15 mysql01 NetworkManager[8417]: <info>  (virbr0-nic): released from master virbr0
1月 26 14:22:15 mysql01 systemd[1]: Stopping Network Manager...
1月 26 14:22:15 mysql01 NetworkManager[8417]: <info>  exiting (success)
1月 26 14:22:15 mysql01 systemd[1]: Stopped Network Manager.
Hint: Some lines were ellipsized, use -l to show in full.
[root@mysql01 network-scripts]# ifconfig

###寫配置檔：（這裏的UUID可能和我上面得到的不一樣,由於配置檔是以前就寫好的.）
-rw-r--r--. 1 root root 292 1月 24 14:52 ifcfg-eno16777736
-rw-r--r--. 1 root root 367 1月 26 13:29 ifcfg-eno33554992

[root@mysql01 network-scripts]# cat ifcfg-eno16777736
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eno16777736
UUID=a808b074-580f-4ff7-b70a-e307769e8d96
DEVICE=eno16777736
ONBOOT=yes
IPADDR=192.168.1.201
PREFIX=24
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes

[root@mysql01 network-scripts]# cat ifcfg-eno33554992
TYPE=Ethernet
BOOTPROTO=static
IPADDR0=192.168.199.241
PREFIXO0=24
GATEWAY=192.168.199.1
DNS1=192.168.199.1
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
NAME=eno33554992
UUID=9c7d8550-2d46-45c1-9c40-ef09570e1608
DEVICE=eno33554992
ONBOOT=yes
PEERDNS=yes
PEERROUTES=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes

###重啓網絡服務:

[root@mysql01 network-scripts]# systemctl restart network.service
[root@mysql01 network-scripts]#

###沒有報錯

[root@mysql01 network-scripts]# systemctl status network.service
* network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network)
   Active: active (exited) since 日 2020-01-26 14:27:22 CST; 18s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 8612 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 8839 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)

1月 26 14:27:17 mysql01 systemd[1]: Starting LSB: Bring up/down networking...
1月 26 14:27:17 mysql01 network[8839]: [29B blob data]
1月 26 14:27:19 mysql01 network[8839]: [37B blob data]
1月 26 14:27:22 mysql01 network[8839]: [37B blob data]
1月 26 14:27:22 mysql01 systemd[1]: Started LSB: Bring up/down networking.
[root@mysql01 network-scripts]#

###嘗試ifup/ifdown腳本：

[root@mysql01 network-scripts]# ifdown eno16777736
[root@mysql01 network-scripts]# ifconfig eno16777736
eno16777736: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 00:0c:29:4a:b1:2c  txqueuelen 1000  (Ethernet)
        RX packets 4359  bytes 4215191 (4.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 169  bytes 22144 (21.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@mysql01 network-scripts]# ifup eno16777736
[root@mysql01 network-scripts]# ifconfig eno16777736
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.201  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::20c:29ff:fe4a:b12c  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:4a:b1:2c  txqueuelen 1000  (Ethernet)
        RX packets 4362  bytes 4218484 (4.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 187  bytes 25011 (24.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@mysql01 network-scripts]# 
[root@mysql01 network-scripts]# ifdown eno33554992
[root@mysql01 Desktop]# ifconfig eno33554992
eno33554992: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 00:0c:29:4a:b1:36  txqueuelen 1000  (Ethernet)
        RX packets 7980  bytes 4516864 (4.3 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2422  bytes 504771 (492.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@mysql01 Desktop]# ifup eno33554992
[root@mysql01 Desktop]# ifconfig eno33554992
eno33554992: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.199.241  netmask 255.255.255.0  broadcast 192.168.199.255
        inet6 fe80::20c:29ff:fe4a:b136  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:4a:b1:36  txqueuelen 1000  (Ethernet)
        RX packets 7982  bytes 4519567 (4.3 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2440  bytes 507648 (495.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@mysql01 Desktop]#

完成