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changeset 38:4026b6b8028f

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get dhcp mapping from lanscape
author drewp@bigasterisk.com
date Sun, 16 Jan 2022 12:12:21 -0800
parents fbd0849dfdbd
children 3a52d3e69724
files dns.py templates/dnsmasq/dhcp_hosts.j2 templates/dnsmasq/dnsmasq.conf.j2
diffstat 3 files changed, 33 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/dns.py	Sat Jan 15 17:10:10 2022 -0800
+++ b/dns.py	Sun Jan 16 12:12:21 2022 -0800
@@ -1,16 +1,45 @@
+import subprocess
+import tempfile
+
+import requests
 from pyinfra import host
 from pyinfra.operations import apt, files, server, systemd
 
+
+def prepare_dhcp_hosts():
+    lanscape_ip = subprocess.check_output([
+        'kubectl',
+        'get',
+        'svc',
+        '--field-selector=metadata.name=lanscape',
+        "-o=jsonpath={.items[0].spec.clusterIP}",
+    ],
+                                          encoding='ascii')
+    url = f'http://{lanscape_ip}/dnsConfig'
+    resp = requests.get(url)
+    resp.raise_for_status()
+    lanscape_config = resp.json()
+
+    dhcp_hosts = tempfile.NamedTemporaryFile(mode='wt', encoding='ascii')
+    dhcp_hosts.write("# written by pyinfra\n\n")
+    for row in lanscape_config['dhcp_table']:
+        dhcp_hosts.write(f'{row["mac"]},{row["hostname"]},{row["ip"]},infinite\n')
+    dhcp_hosts.flush()
+    return dhcp_hosts
+
+
 if host.name == 'bang':
     apt.packages(packages=['dnsmasq'])
     systemd.service(service='dnsmasq', enabled=False, running=False)
     files.directory(path='/opt/dnsmasq')
 
+    dhcp_hosts = prepare_dhcp_hosts()
+
     for net_name in ['10.1', '10.2', '10.5']:
         files.directory(path=f'/opt/dnsmasq/{net_name}')
         files.template(src='templates/dnsmasq/dnsmasq.conf.j2', dest=f'/opt/dnsmasq/{net_name}/dnsmasq.conf', net=net_name)
         files.template(src='templates/dnsmasq/hosts.j2', dest=f'/opt/dnsmasq/{net_name}/hosts', net=net_name)
-        files.template(src='templates/dnsmasq/dhcp_hosts.j2', dest=f'/opt/dnsmasq/{net_name}/dhcp_hosts', net=net_name)
+        files.template(src=dhcp_hosts.name, dest=f'/opt/dnsmasq/{net_name}/dhcp_hosts', net=net_name)
 
         files.template(src='templates/dnsmasq/dnsmasq.service.j2',
                        dest=f'/etc/systemd/system/dnsmasq_{net_name}.service',
--- a/templates/dnsmasq/dhcp_hosts.j2	Sat Jan 15 17:10:10 2022 -0800
+++ b/templates/dnsmasq/dhcp_hosts.j2	Sun Jan 16 12:12:21 2022 -0800
@@ -1,3 +1,5 @@
+this is old; see /my/serv/lanscape/netdevices.n3
+
 b8:97:5a:17:d7:1f,dash,10.1.0.5,infinite
 c8:60:00:98:ec:74,slash,10.1.0.6,infinite
 7c:c3:a1:b0:83:03,kelsi-imac,10.1.0.7,infinite
--- a/templates/dnsmasq/dnsmasq.conf.j2	Sat Jan 15 17:10:10 2022 -0800
+++ b/templates/dnsmasq/dnsmasq.conf.j2	Sun Jan 16 12:12:21 2022 -0800
@@ -46,7 +46,7 @@
 dhcp-hostsfile=/opt/dnsmasq/{{ net }}/dhcp_hosts
 dhcp-leasefile=/opt/dnsmasq/{{ net }}/leases
 dhcp-range=ens5,10.2.0.0,static,infinite
-dhcp-range=tag:!known,ens5,10.2.0.21,10.2.0.120,24h
+dhcp-range=tag:!known,ens5,10.2.0.125,10.2.0.200,24h
 dhcp-option=ens5,option:dns-server,10.2.0.1
 dhcp-option=ens5,option:router,10.2.0.1
 {% endif %}