def start_worker():
''' Start kubelet using the provided API and DNS info.'''
# Note that the DNS server doesn't necessarily exist at this point. We know
# what its IP will eventually be, though, so we can go ahead and configure
# kubelet with that info. This ensures that early pods are configured with
# the correct DNS even though the server isn't ready yet.
kube_api = endpoint_from_flag('kube-api-endpoint.available')
kube_control = endpoint_from_flag('kube-control.dns.available')
cni = endpoint_from_flag('cni.available')
servers = get_kube_api_servers(kube_api)
dns = kube_control.get_dns()
ingress_ip = get_ingress_address(kube_control.relation_name)
cluster_cidr = cni.get_config()['cidr']
if cluster_cidr is None:
hookenv.log('Waiting for cluster cidr.')
return
creds = db.get('credentials')
data_changed('kube-control.creds', creds)
create_config(servers[get_unit_number() % len(servers)], creds)
configure_kubelet(dns, ingress_ip)
configure_kube_proxy(configure_prefix, servers, cluster_cidr)
set_state('kubernetes-worker.config.created')
restart_unit_services()
update_kubelet_status()
set_state('kubernetes-worker.label-config-required')
remove_state('kubernetes-worker.restart-needed')
def get_api_url(endpoints):
"""
Choose an API endpoint from the list and build a URL from it.
"""
if not endpoints:
return None
urls = get_api_urls(endpoints)
return urls[kubernetes_common.get_unit_number() % len(urls)]
def get_api_endpoint(relation=None):
"""
Determine the best endpoint for a client to connect to.
If a relation is given, it will take that into account when choosing an
endpoint.
"""
endpoints = get_lb_endpoints()
if endpoints:
# select a single endpoint based on our local unit number
return endpoints[kubernetes_common.get_unit_number() % len(endpoints)]
elif relation:
ingress_address = hookenv.ingress_address(relation.relation_id,
hookenv.local_unit())
return (ingress_address, STANDARD_API_PORT)
else:
return (hookenv.unit_public_ip(), STANDARD_API_PORT)
def start_worker():
"""Start kubelet using the provided API and DNS info."""
# Note that the DNS server doesn't necessarily exist at this point. We know
# what its IP will eventually be, though, so we can go ahead and configure
# kubelet with that info. This ensures that early pods are configured with
# the correct DNS even though the server isn't ready yet.
kube_control = endpoint_from_flag("kube-control.dns.available")
servers = get_kube_api_servers()
dns = kube_control.get_dns()
dns_domain = dns["domain"]
dns_ip = dns["sdn-ip"]
registry = get_registry_location()
cluster_cidr = kubernetes_common.cluster_cidr()
if cluster_cidr is None:
hookenv.log("Waiting for cluster cidr.")
return
if not servers:
hookenv.log("Waiting for API server URL")
return
if kubernetes_common.is_ipv6(cluster_cidr):
kubernetes_common.enable_ipv6_forwarding()
creds = db.get("credentials")
data_changed("kube-control.creds", creds)
create_config(servers[get_unit_number() % len(servers)], creds)
configure_default_cni(kube_control.get_default_cni())
configure_kubelet(dns_domain, dns_ip, registry, has_xcp=kube_control.has_xcp)
configure_kube_proxy(configure_prefix, servers, cluster_cidr)
set_state("kubernetes-worker.config.created")
restart_unit_services()
update_kubelet_status()
set_state("kubernetes-worker.label-config-required")
set_state("nrpe-external-master.reconfigure")
remove_state("kubernetes-worker.restart-needed")
remove_state("endpoint.kube-control.has-xcp.changed")
def update_nrpe_config():
services = ["snap.{}.daemon".format(s) for s in worker_services]
data = render("nagios_plugin.py", None, {"node_name": get_node_name()})
plugin_path = install_nagios_plugin_from_text(data, "check_k8s_worker.py")
hostname = nrpe.get_nagios_hostname()
current_unit = nrpe.get_nagios_unit_name()
nrpe_setup = nrpe.NRPE(hostname=hostname)
nrpe_setup.add_check("node", "Node registered with API Server", str(plugin_path))
nrpe.add_init_service_checks(nrpe_setup, services, current_unit)
nrpe_setup.write()
creds = db.get("credentials")
servers = get_kube_api_servers()
if creds and servers:
server = servers[get_unit_number() % len(servers)]
create_kubeconfig(
nrpe_kubeconfig_path,
server,
ca_crt_path,
token=creds["client_token"],
user="******",
)
# Make sure Nagios dirs are the correct permissions.
cmd = ["chown", "-R", "nagios:nagios"]
for p in ["/var/lib/nagios/", os.path.dirname(nrpe_kubeconfig_path)]:
if os.path.exists(p):
check_call(cmd + [p])
remove_state("nrpe-external-master.reconfigure")
set_state("nrpe-external-master.initial-config")
# request CPU governor check from nrpe relation to be performance
rel_settings = {
"requested_cpu_governor": "performance",
}
for rid in hookenv.relation_ids("nrpe-external-master"):
hookenv.relation_set(relation_id=rid, relation_settings=rel_settings)