网卡激活－up(dhcp方式获得ip)

一次修复记录

采样：

[root@fp-web-124 network-scripts]# cat /etc/redhat-release 
CentOS Linux release 7.2.1511 (Core)

[root@fp-web-124 network-scripts]# uname -r
3.10.0-327.el7.x86_64

//下记录中的ip和mac地址,uuid都已修改了地址，为了演示方便，都是实际的命令显示，但是修改了真实的地址情况

用nmtui创建网卡配置文件，创建前

[root@fp-web-124 network-scripts]# ls
 ifdown-bnep  ifdown-ipv6  ifdown-routes    ifdown-tunnel  ifup-eth   ifup-isdn   ifup-ppp     ifup-TeamPort     network-functions
 ifdown-eth   ifdown-isdn  ifdown-sit       ifup           ifup-ib    ifup-plip   ifup-routes  ifup-tunnel       network-functions-ipv6
ifcfg-lo      ifdown-ib    ifdown-post  ifdown-Team      ifup-aliases   ifup-ippp  ifup-plusb  ifup-sit     ifup-wireless
ifdown        ifdown-ippp  ifdown-ppp   ifdown-TeamPort  ifup-bnep      ifup-ipv6  ifup-post   ifup-Team    init.ipv6-global

用nmtui创建网卡配置文件，创建后

[root@fp-web-124 network-scripts]# ls
ifcfg-ens192  ifdown-bnep  ifdown-ipv6  ifdown-routes    ifdown-tunnel  ifup-eth   ifup-isdn   ifup-ppp     ifup-TeamPort     network-functions
ifcfg-ens224  ifdown-eth   ifdown-isdn  ifdown-sit       ifup           ifup-ib    ifup-plip   ifup-routes  ifup-tunnel       network-functions-ipv6
ifcfg-lo      ifdown-ib    ifdown-post  ifdown-Team      ifup-aliases   ifup-ippp  ifup-plusb  ifup-sit     ifup-wireless
ifdown        ifdown-ippp  ifdown-ppp   ifdown-TeamPort  ifup-bnep      ifup-ipv6  ifup-post   ifup-Team    init.ipv6-global

这里生成的网卡配置文件需要修改 ONBOOT=yes, 否则你reboot机器启动不起来．

//这里做个测试
这里重启的时候，把第一张网卡ens192设置为yes，第二张副网卡ens224的配置文件的ONBOOT=no之后，启动

[root@fp-web-124 network-scripts]# cat ifcfg-ens192
HWADDR=06:3F:F8:20:22:EB
TYPE=Ethernet
BOOTPROTO=dhcp
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=ens192
#UUID=dd778217-31b8-459b-848e-c4f3a676da74
ONBOOT=yes

[root@fp-web-124 network-scripts]# cat ifcfg-ens224
HWADDR=06:E3:53:00:2F:F6
TYPE=Ethernet
BOOTPROTO=dhcp  //动态获得的ip
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=ens224
UUID=fbde6f80-512a-4682-87fb-9305157c211c
ONBOOT=no

重启之后查看ens224的网卡状态

[root@fp-web-124 network-scripts]# ifconfig ens224
ens224: flags=4098<BROADCAST,MULTICAST>  mtu 1500  //是禁用状态
        ether 02:e9:32:10:1f:f3  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

启用

[root@fp-web-124 network-scripts]# ifconfig ens224 up

再次查看

[root@fp-web-124 network-scripts]# ifconfig ens224
ens224: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500  //网卡已启用
        ether 06:e1:62:00:1f:f3  txqueuelen 1000  (Ethernet)  //但是还没有分配ip
        RX packets 1  bytes 60 (60.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

重启网络

[root@fp-web-124 network-scripts]# systemctl restart network.service
[root@fp-web-124 network-scripts]# ifconfig
//查看ip分配情况
ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.121.40.56  netmask 255.255.255.0  broadcast 10.121.40.255
        ether 01:7e:f2:03:10:eb  txqueuelen 1000  (Ethernet)
        RX packets 118  bytes 15392 (15.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 79  bytes 13736 (13.4 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens224: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.121.50.56  netmask 255.255.255.0  broadcast 10.121.50.255
        ether 01:e9:61:01:1f:f6  txqueuelen 1000  (Ethernet)
        RX packets 4  bytes 804 (804.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5  bytes 810 (810.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

查看网络状态情况:

[root@fp-web-124 network-scripts]# systemctl status network.service
● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: active (running) since Wed 2022-03-23 18:24:50 CST; 26min ago
     Docs: man:systemd-sysv-generator(8)
  Process: 23094 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 23383 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)
   Memory: 24.4M
   CGroup: /system.slice/network.service
           ├─23642 /sbin/dhclient -H fp-web-124 -1 -q -lf /var/lib/dhclient/dhclient--ens192.lease -pf /var/run/dhclient-ens192.pid ens192
           └─23793 /sbin/dhclient -H fp-web-124 -1 -q -lf /var/lib/dhclient/dhclient-fbde3f80-512a-4582-97fc-93052573291c-ens224.lease -pf /var/run/dhclient-ens224...

Mar 23 17:24:47 fp-web-124 network[23383]: [  OK  ]
Mar 23 17:24:48 fp-web-124 network[23383]: Bringing up interface ens224:
Mar 23 17:24:48 fp-web-124 dhclient[23735]: DHCPDISCOVER on ens224 to 255.255.255.255 port 67 interval 4 (xid=0x3ae71a7f)
Mar 23 17:24:48 fp-web-124 dhclient[23735]: DHCPREQUEST on ens224 to 255.255.255.255 port 67 (xid=0x3ae71a7f)
Mar 23 17:24:48 fp-web-124 dhclient[23735]: DHCPOFFER from 10.121.50.10
Mar 23 17:24:48 fp-web-124 dhclient[23735]: DHCPACK from 10.121.50.10 (xid=0x4ae43b7c)
Mar 23 17:24:50 fp-web-124 dhclient[23735]: bound to 10.121.50.56 -- renewal in 2147483646 seconds.
Mar 23 17:24:50 fp-web-124 network[23383]: Determining IP information for ens224... done.
Mar 23 17:24:50 fp-web-124 network[23383]: [  OK  ]
Mar 23 17:24:50 fp-web-124 systemd[1]: Started LSB: Bring up/down networking.