A concise run-book to set up a Ubuntu VM in Proxmox, configure networking with Netplan, and install Nginx.

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network setting

Ubuntu 24.04 uses Netplan + systemd-networkd by default, so you set both a static address and custom DNS by editing a small YAML file and re-applying it. Below is a concise run-book you can execute over your current SSH session; afterwards Outlook-style validation tips confirm everything is working.Ubuntu 24.04 默认使用 Netplan + systemd-networkd ，因此您可以通过编辑一个小型 YAML 文件并重新应用它来设置静态地址和自定义 DNS。下面是一个简洁的运行手册，您可以在当前的 SSH 会话中执行；之后，Outlook 风格的验证提示将确认一切正常。

Prepare and back-up1 准备和备份

sudo mkdir -p /etc/netplan/backup 
sudo cp /etc/netplan/*.yaml /etc/netplan/backup/ 
ip a            # confirm the NIC name (ens18 in your screenshot)

Backing up before changes is recommended in all Netplan docs to avoid lock-outs. 所有 Netplan 文档都建议在更改之前进行备份，以避免锁定。

Write the static configuration2 编写静态配置

Create or edit /etc/netplan/01-static.yaml:创建或编辑 /etc/netplan/01-static.yaml

network:
  version: 2
  renderer: networkd      # default on Server; keep NetworkManager on Desktop
  ethernets:
    ens18:
      dhcp4: false
      addresses: [192.168.0.153/24]     # <-- static IP
      gateway4: 192.168.0.1             # adjust to your router if different
      nameservers:
        addresses: [192.168.0.200, 1.1.1.1]

apply the setting

sudo netplan generate    # syntax check
sudo netplan apply       # puts the config live

Tip: If you lose the SSH session because the IP changed, reconnect with the new address. Netplan rolls back automatically after 120 seconds if it cannot reach the network. netplan.io提示：如果您因 IP 地址更改而丢失 SSH 会话，请使用新地址重新连接。如果 Netplan 无法连接到网络，则会在 120 秒后自动回滚

keep the .local zone and force unicast DNS修复 A – 保留 .local 区域并强制使用单播 DNS

1 Create a resolved override1 创建已解析覆盖

sudoedit /etc/systemd/resolved.conf

Add (or un-comment) the following:添加（或取消注释）以下内容：

[Resolve]
DNS=192.168.0.200 1.1.1.1
Domains=~greenhuang.local          # “tilde” routes only this zone
MulticastDNS=no                    # keep mDNS off
LLMNR=no

Domains=~zone tells resolved to send queries for that zone exclusively to the listed DNS servers even though the suffix is .local.Unix & Linux Stack ExchangeDomains=~zone 指示 solved 将针对该区域的查询专门发送到列出的 DNS 服务器，即使后缀是 .local。Unix & Linux Stack Exchange

Restart the resolver2 重启解析器 sudo systemctl restart systemd-resolved

test

root@ubuntu:/etc/netplan# resolvectl query mail.greenhuang.local
mail.greenhuang.local: 192.168.0.199           -- link: ens18

-- Information acquired via protocol DNS in 6.9ms.
-- Data is authenticated: no; Data was acquired via local or encrypted transport: no
-- Data from: network


root@ubuntu:/etc/netplan# ping -c3 mail.greenhuang.local
PING mail.greenhuang.local (192.168.0.199) 56(84) bytes of data.
64 bytes from 192.168.0.199: icmp_seq=1 ttl=128 time=1.12 ms
64 bytes from 192.168.0.199: icmp_seq=2 ttl=128 time=0.576 ms
^C
--- mail.greenhuang.local ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 0.576/0.848/1.120/0.272 ms


root@ubuntu:/etc/netplan# ping -c3 google.com
PING google.com (142.250.66.238) 56(84) bytes of data.
64 bytes from syd15s15-in-f14.1e100.net (142.250.66.238): icmp_seq=1 ttl=116 time=19.9 ms
64 bytes from syd15s15-in-f14.1e100.net (142.250.66.238): icmp_seq=2 ttl=116 time=20.3 ms
64 bytes from syd15s15-in-f14.1e100.net (142.250.66.238): icmp_seq=3 ttl=116 time=19.7 ms

--- google.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 19.683/19.960/20.269/0.240 ms

nginx

sudo apt install nginx
sudo systemctl enable --now nginx   # start at boot

setup ssh

generate ssh key on windowsssh-keygen files under C:\Users\huang\.ssh

mkdir -p ~/.ssh
nano ~/.ssh/authorized_keys
# copy xx.pub files on it

chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys

setup a Ubuntu VM in Proxmox