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Pause autoinstall on network screen

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This commit is contained in:
Jino Jose 2026-06-24 18:54:49 +05:30
parent 9217511f84
commit e589e48511
3 changed files with 46 additions and 3 deletions
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2
README.md
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@ -10,6 +10,8 @@ sudo bash install.sh
Server reboots automatically after NVIDIA drivers install. Phase 2 runs on its own after reboot.
On the custom ISO, Ubuntu autoinstall now pauses on the installer network screen so the operator can choose the final IP address from the VM console before installation continues.
## What Gets Installed (Entry Tier)
| Service | Port | Notes |

8
autoinstall/user-data
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@ -1,14 +1,18 @@
#cloud-config
autoinstall:
version: 1
interactive-sections:
- network
# ── Locale & keyboard ──────────────────────────
locale: en_IN.UTF-8
keyboard:
layout: us
# ── Network: DHCP on first ethernet ───────────
# Final network config is set by the web setup UI (browser on port 80)
# ── Network: stop on installer network screen ─
# Subiquity will show the network UI and use the values below as defaults.
# This lets the operator set the final static IP from the VM console before
# installation completes.
network:
network:
version: 2

39
autoinstall/websetup/server.py
View File

@ -58,6 +58,19 @@ def validate_static_network(ip, prefix, gateway, dns):
raise ValueError("CIDR prefix must be between 1 and 32")
return str(prefix_int)
def is_ip_in_use(ip):
"""Best-effort conflict check before taking a static IP."""
try:
result = subprocess.run(
["ping", "-c", "1", "-W", "1", ip],
stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL,
check=False,
)
return result.returncode == 0
except Exception:
return False
def apply_static_ip(iface, ip, prefix, gateway, dns):
prefix = validate_static_network(ip, prefix, gateway, dns)
config = f"""network:
@ -270,6 +283,9 @@ HTML = r"""<!DOCTYPE html>
</div>
<div class="static-fields" id="static-fields">
<div class="alert alert-info">
We will ping the IP before applying it. If it replies, we will block the change to avoid taking an address that is already in use.
</div>
<div class="ip-row">
<div class="form-group">
<label>IP Address</label>
@ -437,7 +453,15 @@ function applyStaticIP() {
dns: document.getElementById('ip-dns').value,
};
fetch('/api/network', { method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify(body) })
.then(r=>r.json()).then(d=>{ if(!d.ok) alert('Network config failed: ' + d.error); });
.then(r=>r.json()).then(d=>{
if(!d.ok) {
alert('Network config failed: ' + d.error);
return;
}
if (d.warning) {
alert(d.warning);
}
});
}
// ── Tier ───────────────────────────────────────────────────
@ -663,7 +687,20 @@ class Handler(BaseHTTPRequestHandler):
if body.get("mode") == "static":
ifaces = get_interfaces()
iface = ifaces[0] if ifaces else "eth0"
validate_static_network(body["ip"], body["prefix"], body["gateway"], body["dns"])
if is_ip_in_use(body["ip"]):
self.send_json({
"ok": False,
"error": f"IP address {body['ip']} is already replying to ping. Choose a different address."
}, 409)
return
apply_static_ip(iface, body["ip"], body["prefix"], body["gateway"], body["dns"])
self.send_json({
"ok": True,
"ip": get_ip(),
"warning": "Ping check passed before applying the static IP. Note: a non-reply does not guarantee the address is unused if another host blocks ICMP."
})
return
self.send_json({"ok": True, "ip": get_ip()})
except Exception as e:
self.send_json({"ok": False, "error": str(e)}, 500)