如何检测/防止系统网络启动失败

Question

使用Centos 7(最近的更新)，在200英里之外的远程防火墙机器上，我偶尔会遇到重新启动网络堆栈时遇到的困难。这个盒子有3个接口，外部DHCP接口通常只需要稍长时间才能打开，而且网络堆栈没有正确等待，结果是服务器启动了，但无法通过互联网到达。

网卡是使用e1000e驱动的双英特尔芯片组。我有这个问题更严重的车载接口，所以我得到了这张卡，以解决问题。它起了作用，但仍未完全解决。大多数情况下，网络堆栈的另一次软重新启动或重新启动会使其重新正常运行。

我使用的是遗留的网络脚本，而不是NetworkManager，因为接口复杂，需要良好的远程设置；我经常很难让NM正确启动复杂的配置。

即使考虑某种类型的紧急网络监视器，如果它看到网络不在联机，就会尝试重新启动/重新启动。当它失败时，我必须指导我85岁的母亲学习基本的Linux网络命令，我相信你们都会意识到这是一个挑战。

下面是最近一次引导失败的/var/log/消息。

May 14 04:58:55 windward network: Bringing up loopback interface:  Cannot get current device settings: No such device
May 14 04:58:55 windward network: not setting speed
May 14 04:58:55 windward network: not setting duplex
May 14 04:58:55 windward network: not setting autoneg
May 14 04:58:55 windward network: [  OK  ]
May 14 04:58:55 windward network: Bringing up interface enp1s0f0:  Cannot get current device settings: No such device
May 14 04:58:55 windward network: not setting speed
May 14 04:58:55 windward network: not setting duplex
May 14 04:58:55 windward network: not setting autoneg
May 14 04:58:55 windward kernel: IPv6: ADDRCONF(NETDEV_UP): enp1s0f0: link is not ready
May 14 04:59:00 windward kernel: e1000e: enp1s0f0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None
May 14 04:59:00 windward kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enp1s0f0: link becomes ready
May 14 04:59:01 windward network: Determining IP information for enp1s0f0... failed; no link present.  Check cable?
May 14 04:59:01 windward network: [FAILED]
May 14 04:59:01 windward network: Bringing up interface enp1s0f1:  Cannot get current device settings: No such device
May 14 04:59:01 windward network: not setting speed
May 14 04:59:01 windward network: not setting duplex
May 14 04:59:01 windward network: not setting autoneg
May 14 04:59:01 windward kernel: IPv6: ADDRCONF(NETDEV_UP): enp1s0f1: link is not ready
May 14 04:59:03 windward kernel: e1000e: enp1s0f1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
May 14 04:59:03 windward kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enp1s0f1: link becomes ready
May 14 04:59:04 windward network: Determining if ip address 10.20.128.1 is already in use for device enp1s0f1...
May 14 04:59:06 windward network: [  OK  ]
May 14 04:59:06 windward systemd: network.service: control process exited, code=exited status=1
May 14 04:59:06 windward systemd: Failed to start LSB: Bring up/down networking.
May 14 04:59:06 windward systemd: Unit network.service entered failed state.
May 14 04:59:06 windward systemd: network.service failed.
May 14 04:59:06 windward systemd: Reached target Network.
May 14 04:59:06 windward systemd: Starting Network.
May 14 04:59:06 windward systemd: Started OpenSSH server daemon.

Answer 1

您是否试图在配置文件中增加DHCP客户端超时？

您能否尝试编辑/etc/dhcp/dhclient.conf并设置‘超时值’选项，如下所示：

timeout=60