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codemonkey
Asked: 2019-04-06 14:09:22 +0800 CST

Ubuntu Server DNS Problem with Static IP

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I am running an Ubuntu Server on my VMBox and need to set static IP. By following the steps described in https://www.techrepublic.com/article/how-to-configure-a-static-ip-address-in-ubuntu-server-18-04/, I created the configuration file 01-netcfg.yaml as follows.

network:
  version: 2
  renderer: networkd        
  ethernets:
    enp0s3:
      dhcp4: no
      addresses: [10.10.21.8/24]
      gateway4: 10.10.21.100
      nameservers:
        addresses: [8.8.8.8, 8.8.4.4]

Running sudo netplan apply --debugresults in:

debug

Which I'm not sure if the process is succesful or not since it mentions a merged config but gives no error at the end. However, I can not connect to Internet. sudo ping www.facebook.com returns "Temporary failure in name resolution". ping 64.233.169.104 results in "Destination Host Unreachable". sudo apt-get update fails as well.

sudo lshw -C network:

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 cat /etc/netplan/*

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After trying the answer. 

cat /etc/resolv.conf

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ls -al /etc/resolv.conf

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ls -al /etc/netplan

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sudo netplan generate --debug

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sudo netplan apply

No output. 

systemd-resolve --status

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server dns netplan

2 Answers

  1. Best Answer

    Partial answer...

    From the comments...

    In /etc/netplan we have three files...

    01-network-card.yaml          # the file that you created
50-cloud-init.yaml            # the file that was already there
99-disable-network-config.cfg # who knows where this file came from

    cd /etc/netplan # change directories

    sudo mv 50-cloud-init.yaml 50-cloud-init.yaml.HOLD # rename file

    sudo mv 99-disable-network-config.cfg 99-disable-network-config.cfg.HOLD # rename file

    sudo netplan --debug generate # generate config files

    sudo netplan apply # apply new configuration

    Note: The new configuration may already work at this point.

    reboot # confirm operation

    Update #1:

    The 10.10.21.8 and 10.10.21.100 addresses are not correct. Go back to your instructor and get valid addresses, and then it should all work now. This all works when using dhcp4: true instead of static IP's.

    • 1

  2. After hours of trying suggestions with no success and since I was also having this issue with a VM machine I was able to finally do an apt-get update/upgrade by just creating another VM NIC on the VM settings. Ubuntu Server 18.04 reconigzed it right away and configured the new NIC with DHCP. Apt-get was able to connect to repositories, download and upgrade the install. I then turned off the Ubuntu VM, removed the secondary NIC form its settings and was able to use Apt-get and ping google.com after rebooting using only the original NIC. My static IP settings did not changed.

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