centos7如何把虚拟网卡名称ifcfg

2024-05-31 14:46| 来源: 网络整理| 查看: 265

写在前面：遇到centos网络配置的问题，请先参考https://blog.csdn.net/zhuzj12345/article/details/80747862《CentOS 7下无法上网的终极解决方案》如果试过后仍未解决，可以参考下面的做法。

问题：centos7无法重启网卡，虚拟网卡无法使用

最近帮朋友调试虚拟机遇到个问题，出现了以下问题：

#重启网卡 [root@localhost network-scripts]# service network start Starting network (via systemctl): Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn' for details.[FAILED] #查看网卡状态 [root@localhost network-scripts]# systemctl status network.service network.service - LSB: Bring up/down networking Loaded: loaded (/etc/rc.d/init.d/network) Active: failed (Result: exit-code) since Sat 2015-03-07 02:53:12 EST; 6s ago Process: 8596 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE) Aug 24 10:03:28 localhost.localdomain network[8596]: RTNETLINK answers: File ...Aug 24 10:03:28 localhost.localdomain network[8596]: RTNETLINK answers: File ...Aug 24 10:03:28 localhost.localdomain network[8596]: RTNETLINK answers: File ...Aug 24 10:03:28 localhost.localdomain network[8596]: RTNETLINK answers: File ...Aug 24 10:03:28 localhost.localdomain network[8596]: RTNETLINK answers: File ...Aug 24 10:03:28 localhost.localdomain network[8596]: RTNETLINK answers: File ...Aug 24 10:03:28 localhost.localdomain systemd-sysctl[8913]: Overwriting earli... Aug 24 10:03:28 localhost.localdomain systemd[1]: network.service: control pr... Aug 24 10:03:28 localhost.localdomain systemd[1]: Failed to start LSB: Bring ... Aug 24 10:03:28 localhost.localdomain systemd[1]: Unit network.service entere... Hint: Some lines were ellipsized, use -l to show in full. #查看日志 cat /var/log/messages |grep network Aug 24 10:05:10 dg-p systemd: Starting LSB: Bring up/down networking... Aug 24 10:05:10 dg-p network: Bringing up loopback interface: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo' Aug 24 10:05:10 dg-p network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo' Aug 24 10:05:10 dg-p network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo' Aug 24 10:05:10 dg-p network: Could not load file '/etc/sysconfig/network-scripts/ifcfg-lo' Aug 24 10:05:10 dg-p network: [ OK ] Aug 24 10:05:11 dg-p network: Bringing up interface eno16777736: Error: Connection activation failed: No suitable device found for this connection. Aug 24 10:05:11 dg-p network: [FAILED] Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p network: RTNETLINK answers: File exists Aug 24 10:05:11 dg-p systemd: network.service: control process exited, code=exited status=1 Aug 24 10:05:11 dg-p systemd: Failed to start LSB: Bring up/down networking. Aug 24 10:05:11 dg-p systemd: Unit network.service entered failed state. Aug 24 10:05:11 dg-p systemd: network.service failed.

于是开始排查，通过vi /etc/sysconfig/network-scripts/ifcfg-eno16777736查看网卡配置：

#查看网卡配置 [root@localhost network-scripts]# vi /etc/sysconfig/network-scripts/ifcfg-eno16777736 TYPE=Ethernet BOOTPROTO=static 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=eno16777736 DEVICE=eno16777736 ONBOOT=yes IPADDR=192.168.138.158 NETMASK=255.255.255.0 GATEWAY=192.168.138.1 DNS1=8.8.8.8 DNS2=8.8.4.4

没有问题！然后用vi /etc/sysconfig/grub命令查看系统启动项配置

#查看系统启动项配置 [root@localhost network-scripts]# 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 net.ifnames=0 biosdevname=0 rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet" GRUB_DISABLE_RECOVERY="true"

问题来了！内核参数手动设置”GRUB_CMDLINE_LINUX“变量添加“net.ifnames=0 biosdevname=0”，使得默认的eno16777736不可用

centos7.X版本默认的网卡名称为eno16777736

内核参数组合使用的时候，其结果如下：默认内核参数(biosdevname=0，net.ifnames=1): 网卡名 “enp5s2” biosdevname=1，net.ifnames=0：网卡名 “em1” biosdevname=0，net.ifnames=0：网卡名 “eth0” (最传统的方式,eth0 eth1 )

解决方案一，保留默认的网卡名称eno16777736：

（1）删除/etc/sysconfig/grub内核参数手动设置”GRUB_CMDLINE_LINUX“中的“net.ifnames=0 biosdevname=0”

#查看系统启动项配置 [root@localhost network-scripts]# 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 rhgb quiet" GRUB_DISABLE_RECOVERY="true"

：wq！保存

（2）清空/etc/udev/rules.d/70-persistent-net.rules里面的内容（3）重启机器:

[root@localhost network-scripts]# reboot 解决方案二，把网卡名称改成eth0：

（1）修改网卡名和配置文件 mv /etc/sysconfig/network-scripts/ifcfg-eno16777736 /etc/sysconfig/network-scripts/ifcfg-eth0

[root@localhost network-scripts]# mv /etc/sysconfig/network-scripts/ifcfg-eno16777736 /etc/sysconfig/network-scripts/ifcfg-eth0

（2）修改配置文件里面name和device vi /etc/sysconfig/network-scripts/ifcfg-eth0

#查看网卡配置 [root@localhost network-scripts]# vi /etc/sysconfig/network-scripts/ifcfg-eno16777736 TYPE=Ethernet BOOTPROTO=static 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 DEVICE=eth0 ONBOOT=yes IPADDR=192.168.138.158 NETMASK=255.255.255.0 GATEWAY=192.168.138.1 DNS1=8.8.8.8 DNS2=8.8.4.4

（3）配置/etc/sysconfig/grub，保留net.ifnames=0 biosdevname=0 vi /etc/sysconfig/grub

（4）手动生成70-persistent-net.rules以及其他方法查看接口的MAC地址

# 查看接口的MAC地址 [root@localhost network-scripts]# ip link show 1: lo: 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: eno16777736: mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 00:50:56:22:9b:24 brd ff:ff:ff:ff:ff:ff

（5）重启机器:

[root@localhost network-scripts]# reboot

网卡命名规则和linux启动项说明可参考：参考https://blog.csdn.net/hzj_001/article/details/81587824《linux网卡命名规则》系统启动项https://blog.csdn.net/sfslife/article/details/50935867《系统启动项(/etc/default/grub文件详解)》

【本文地址】

公司简介

联系我们