mirror of https://github.com/helm/helm
jackgr
9 years ago
parent
fb0e722ed9
commit
e46a1eb752
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name: replicatedservice
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description: Port of the replicatedservice template from kubernetes/charts
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version: 3
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expander:
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name: Expandybird
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entrypoint: templates/replicatedservice.py
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schema: templates/replicatedservice.py.schema
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"""Defines a ReplicatedService type by creating both a Service and an RC.
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This module creates a typical abstraction for running a service in a
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Kubernetes cluster, namely a replication controller and a service packaged
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together into a single unit.
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"""
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import yaml
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SERVICE_TYPE_COLLECTION = 'Service'
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RC_TYPE_COLLECTION = 'ReplicationController'
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def GenerateConfig(context):
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"""Generates a Replication Controller and a matching Service.
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Args:
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context: Template context. See schema for context properties
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Returns:
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A Container Manifest as a YAML string.
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"""
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# YAML config that we're going to create for both RC & Service
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config = {'resources': []}
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name = context.env['name']
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container_name = context.properties.get('container_name', name)
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namespace = context.properties.get('namespace', 'default')
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# Define things that the Service cares about
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service_name = context.properties.get('service_name', name + '-service')
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service_type = SERVICE_TYPE_COLLECTION
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# Define things that the Replication Controller (rc) cares about
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rc_name = context.properties.get('rc_name', name + '-rc')
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rc_type = RC_TYPE_COLLECTION
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service = {
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'name': service_name,
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'type': service_type,
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'properties': {
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'apiVersion': 'v1',
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'kind': 'Service',
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'namespace': namespace,
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'metadata': {
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'name': service_name,
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'labels': GenerateLabels(context, service_name),
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},
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'spec': {
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'ports': [GenerateServicePorts(context, container_name)],
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'selector': GenerateLabels(context, name)
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}
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}
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}
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set_up_external_lb = context.properties.get('external_service', None)
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if set_up_external_lb:
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service['properties']['spec']['type'] = 'LoadBalancer'
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cluster_ip = context.properties.get('cluster_ip', None)
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if cluster_ip:
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service['properties']['spec']['clusterIP'] = cluster_ip
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config['resources'].append(service)
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rc = {
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'name': rc_name,
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'type': rc_type,
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'properties': {
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'apiVersion': 'v1',
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'kind': 'ReplicationController',
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'namespace': namespace,
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'metadata': {
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'name': rc_name,
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'labels': GenerateLabels(context, rc_name),
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},
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'spec': {
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'replicas': context.properties['replicas'],
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'selector': GenerateLabels(context, name),
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'template': {
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'metadata': {
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'labels': GenerateLabels(context, name),
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},
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'spec': {
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'containers': [
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{
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'env': GenerateEnv(context),
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'name': container_name,
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'image': context.properties['image'],
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'ports': [
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{
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'name': container_name,
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'containerPort': context.properties['container_port'],
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}
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],
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}
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],
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}
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}
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}
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}
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}
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# Set up volume mounts
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if context.properties.get('volumes', None):
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rc['properties']['spec']['template']['spec']['containers'][0]['volumeMounts'] = []
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rc['properties']['spec']['template']['spec']['volumes'] = []
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for volume in context.properties['volumes']:
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# mountPath should be unique
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volume_name = volume['mount_path'].replace('/', '-').lstrip('-') + '-storage'
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rc['properties']['spec']['template']['spec']['containers'][0]['volumeMounts'].append(
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{
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'name': volume_name,
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'mountPath': volume['mount_path']
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}
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)
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del volume['mount_path']
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volume['name'] = volume_name
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rc['properties']['spec']['template']['spec']['volumes'].append(volume)
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if context.properties.get('privileged', False):
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rc['properties']['spec']['template']['spec']['containers'][0]['securityContext'] = {
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'privileged': True
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}
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config['resources'].append(rc)
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return yaml.dump(config)
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# Generates labels either from the context.properties['labels'] or generates
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# a default label 'name':name
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def GenerateLabels(context, name):
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"""Generates labels from context.properties['labels'] or creates default.
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We make a deep copy of the context.properties['labels'] section to avoid
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linking in the yaml document, which I believe reduces readability of the
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expanded template. If no labels are given, generate a default 'name':name.
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Args:
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context: Template context, which can contain the following properties:
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labels - Labels to generate
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Returns:
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A dict containing labels in a name:value format
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"""
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tmp_labels = context.properties.get('labels', None)
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ret_labels = {'name': name}
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if isinstance(tmp_labels, dict):
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for key, value in tmp_labels.iteritems():
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ret_labels[key] = value
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return ret_labels
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def GenerateServicePorts(context, name):
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"""Generates a ports section for a service.
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Args:
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context: Template context, which can contain the following properties:
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service_port - Port to use for the service
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target_port - Target port for the service
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protocol - Protocol to use.
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Returns:
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A dict containing a port definition
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"""
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container_port = context.properties['container_port']
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target_port = context.properties.get('target_port', container_port)
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service_port = context.properties.get('service_port', target_port)
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protocol = context.properties.get('protocol')
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ports = {}
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if name:
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ports['name'] = name
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if service_port:
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ports['port'] = service_port
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if target_port:
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ports['targetPort'] = target_port
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if protocol:
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ports['protocol'] = protocol
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return ports
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def GenerateEnv(context):
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"""Generates environmental variables for a pod.
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Args:
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context: Template context, which can contain the following properties:
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env - Environment variables to set.
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Returns:
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A list containing env variables in dict format {name: 'name', value: 'value'}
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"""
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env = []
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tmp_env = context.properties.get('env', [])
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for entry in tmp_env:
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if isinstance(entry, dict):
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env.append({'name': entry.get('name'), 'value': entry.get('value')})
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return env
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@ -0,0 +1,91 @@
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info:
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title: Replicated Service
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description: |
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Defines a ReplicatedService type by creating both a Service and an RC.
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This module creates a typical abstraction for running a service in a
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Kubernetes cluster, namely a replication controller and a service packaged
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together into a single unit.
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required:
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- image
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properties:
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container_name:
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type: string
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description: Name to use for container. If omitted, name is used.
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service_name:
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type: string
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description: Name to use for service. If omitted, name-service is used.
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namespace:
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type: string
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description: Namespace to create resources in. If omitted, 'default' is
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used.
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default: default
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protocol:
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type: string
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description: Protocol to use for the service.
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service_port:
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type: int
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description: Port to use for the service.
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target_port:
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type: int
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description: Target port to use for the service.
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container_port:
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type: int
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description: Port to use for the container.
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replicas:
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type: int
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description: Number of replicas to create in RC.
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image:
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type: string
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description: Docker image to use for replicas.
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labels:
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type: object
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description: Labels to apply.
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env:
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type: array
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description: Environment variables to apply.
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properties:
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name:
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type: string
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value:
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type: string
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external_service:
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type: boolean
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description: If set to true, enable external load balancer.
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cluster_ip:
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type: string
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description: IP to use for the service
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privileged:
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type: boolean
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description: If set to true, enable privileged container
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volumes:
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type: array
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description: Volumes to mount.
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items:
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type: object
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properties:
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mounth_path:
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type: string
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description: Path to mount volume
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# See https://cloud.google.com/container-engine/docs/spec-schema?hl=en for possible volumes. Since we only use gcePersistentDisk and NFS in our examples we have only added these ones.
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oneOf:
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gcePersistentDisk:
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pdName:
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type: string
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description: Persistent's disk name
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fsType:
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type: string
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description: Filesystem type of the persistent disk
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nfs:
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server:
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type: string
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description: The hostname or IP address of the NFS server
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path:
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type: string
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description: The path that is exported by the NFS server
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readOnly:
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type: boolean
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description: Forces the NFS export to be mounted with read-only permissions
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