1 # ONAP DCAE Kubernetes Plugin for Cloudify
3 This directory contains a Cloudify plugin used to orchestrate the deployment of containerized DCAE service components into a Kubernetes ("k8s")
4 environment. This work is based on the [ONAP DCAE Docker plugin] (../docker).
6 This plugin is *not* a generic Kubernetes plugin that exposes the full set of Kubernetes features.
7 In fact, the plugin largely hides the fact that we're using Kubernetes from both component developers and blueprint authors.
8 The Cloudify node type definitions are very similar to the Cloudify type definitions used in the ONAP DCAE Docker plugin.
10 For the node types `ContainerizedServiceComponent` and `ContainerizedServiceComponentUsingDmaap`, this plugin
11 creates the following Kubernetes entities:
13 - A Kubernetes `Deployment` containing information about what containers to run and what volume to mount.
14 - The `Deployment` always includes a container that runs the component's Docker image
15 - The `Deployment` includes any volumes specified in the blueprint
16 - If the blueprint specifies a logging directory via the `log_info` property, the `Deployment` includes a second container,
17 running the `filebeat` logging sidecar that ships logging information to the ONAP ELK stack. The `Deployment` will include
18 some additional volumes needed by filebeat.
19 - If the blueprint specifies that the component uses TLS (HTTPS) via the `tls_info` property, the `Deployment` includes an init container,
20 a volume that holds TLS certificate artifacts, and volume mounts on the init container and the component's container. The init container
21 populates the TLS certificate artifacts volume with certificates, keys, keystores, etc.
22 - If the blueprint indicates that the component exposes any ports, the plugin will create a Kubernetes `Service` that allocates an address
23 in the Kubernetes network address space that will route traffic to a container that's running the component. This `Service` provides a
24 fixed "virtual IP" for the component.
25 - If the blueprint indicates that the component exposes a port externally, the plugin will create an additional Kubernetes `Service` that opens up a
26 port on the external interface of each node in the Kubernetes cluster.
28 Through the `replicas` property, a blueprint can request deployment of multiple instances of the component. The plugin will still create a single `Deployment` (and,
29 if needed one or two `Services`), but the `Deployment` will cause multiple instances of the container to run. (Specifically, the `Deployment` will create
30 a Kubernetes `Pod` for each requested instance.) Other entities connect to a component via the IP address of a `Service`, and Kubernetes takes care of routing
31 traffic to an appropriate container instance.
35 #### Configuration file
36 The plugin expects a configuration file in the Python "ini" format to be stored at `/opt/onap/config.txt`. This file contains the address of the Consul cluster.
40 address=10.12.5.115:30270
42 #### Configuration entry in Consul
43 Additional configuration information is stored in the Consul KV store under the key `k8s-plugin`.
44 The configuration is provided as JSON object with the following properties:
46 - `namespace`: k8s namespace to use for DCAE
47 - `consul_dns_name`: k8s internal DNS name for Consul (passed to containers)
48 - `image_pull_secrets`: list of names of k8s secrets for accessing Docker registries, with the following properties:
49 - `filebeat`: object containing onfiguration for setting up filebeat container
50 - `log_path`: mount point for log volume in filebeat container
51 - `data_path`: mount point for data volume in filebeat container
52 - `config_path`: mount point for config volume in filebeat container
53 - `config_subpath`: subpath for config data in filebeat container
54 - `config_map`: name of a ConfigMap holding the filebeat configuration file
55 - `image`: Docker image to use for filebeat
56 - `tls`: object containing configuration for setting up TLS init container
57 - `cert_path`: mount point for the TLS certificate artifact volume in the init container
58 - `image`: Docker image to use for the TLS init container
61 #### Kubernetes access information
62 The plugin accesses a Kubernetes cluster. The information and credentials for accessing a cluster are stored in a "kubeconfig"
63 file. The plugin expects to find such a file at `/etc/cloudify/.kube/config`.
65 #### Additional Kubernetes configuration elements
66 The plugin expects certain elements to be provided in the DCAE/ONAP environment, namely:
67 - Kubernetes secret(s) containing the credentials needed to pull images from Docker registries, if needed
68 - A Kubernetes ConfigMap containing the filebeat.yml file used by the filebeat logging container
69 - An ExternalName service
73 ### `start` operation parameters
75 These input parameters are for the `start` `cloudify.interfaces.lifecycle` and are inputs into the variant task operations `create_and_start_container*`.
79 A map of environment variables that is intended to be forwarded to the container as environment variables. Example:
83 EXTERNAL_IP: '10.100.1.99'
86 These environment variables will be forwarded in addition to the *platform-related* environment variables like `CONSUL_HOST`.
90 List of maps used for setting up Kubernetes volume mounts. Example:
95 path: '/var/run/docker.sock'
97 bind: '/tmp/docker.sock'
101 The table below describes the fields.
105 path | Full path to the file or directory on the host machine to be mounted
106 bind | Full path to the file or directory in the container where the volume should be mounted to
107 mode | Readable, writeable: `ro`, `rw`
111 List of strings - Used to bind container ports to host ports. Each item is of the format: `<container port>:<host port>` or
112 <container port>/<protocol>:<host port>, where <protocol> can be "TCP", "tcp", "UDP", or "udp". If the first format is used, the
113 protocol defaults to TCP.
122 In the Kubernetes environment, most components will communicate over the Kubernetes network using private addresses. For those cases,
123 setting the `<host port>` to 0 will expose the `<container port>` to other components on the Kubernetes network, but not will not expose any
124 ports on the Kubernetes host's external interface. Setting `<host port>` to a non-zero value will expose that port on the external interfaces
125 of every Kubernetes host in the cluster. (This uses the Kubernetes `NodePort` service type.)
129 Integer - seconds to wait for component to become ready before throwing a `NonRecoverableError`. For example:
136 Default is 300 seconds.
140 The node type `dcae.nodes.ContainerizedServiceComponentUsingDmaap` is intended to be used by components that use DMaaP and expects to be connected with the DMaaP node types found in the DMaaP plugin.
144 The properties `streams_publishes` and `streams_subscribes` both are lists of objects that are intended to be passed into the DMaaP plugin and used to create additional parameters that will be passed into the DMaaP plugin.
148 For message router publishers and subscribers, the objects look like:
157 Where `name` is the node name of `dcae.nodes.Topic` or `dcae.nodes.ExistingTopic` that the Docker node is connecting with via the relationships `dcae.relationships.publish_events` for publishing and `dcae.relationships.subscribe_to_events` for subscribing.
161 For data router publishers, the object looks like:
169 Where `name` is the node name of `dcae.nodes.Feed` or `dcae.nodes.ExistingFeed` that the Docker node is connecting with via the relationships `dcae.relationships.publish_files`.
171 For data router subscribers, the object looks like:
183 Where the relationship to use is `dcae.relationships.subscribe_to_files`.
185 If `username` and `password` are not provided, then the plugin will generate username and password pair.
187 `route` and `scheme` are parameter used in the dynamic construction of the delivery url which will be passed to the DMaaP plugin to be used in the setting up of the subscriber to the feed.
189 `route` is the http path endpoint of the subscriber that will handle files from the associated feed.
191 `scheme` is either `http` or `https`. If not specified, then the plugin will default to `http`.
193 ### Component configuration
195 The DMaaP plugin is responsible to provision the feed/topic and store into Consul the resulting DMaaP connection details. Here is an example:
200 "client_role": "XXXX",
203 "topic_url": "https://some-topic-url.com/events/abc"
208 This is to be merged with the templatized application configuration:
212 "some-param": "Lorem ipsum dolor sit amet",
213 "streams_subscribes": {
215 "type": "message_router",
216 "aaf_username": "user-foo",
217 "aaf_password": "password-bar",
218 "dmaap_info": "<< topic00 >>"
221 "streams_publishes": {},
226 To form the application configuration:
230 "some-param": "Lorem ipsum dolor sit amet",
231 "streams_subscribes": {
233 "type": "message_router",
234 "aaf_username": "user-foo",
235 "aaf_password": "password-bar",
237 "client_role": "XXXX",
240 "topic_url": "https://some-topic-url.com/events/abc"
244 "streams_publishes": {},
249 This also applies to data router feeds.
251 ## Additional Operations Supported by the Plugin
252 In addition to supporting the Cloudify `install` and `uninstall` workflows, the plugin provides two standalone operations that can be invoked using the Cloudify [`execute_operation` workflow](https://docs.cloudify.co/4.3.0/working_with/workflows/built-in-workflows/). The `dcae.nodes.ContainerizedApplication`, `dcae.nodes.ContainerizedServiceComponent`, and `dcae.nodes.ContainerizedServiceComponentUsingDmaap` node types support these operations.
254 Currently, there's no convenient high-level interface to trigger these operations, but they could potentially be exposed through some kind of dashboard.
256 ### Scaling Operation (`scale`)
257 The `scale` operation provides a way to change the number of replicas running for a node instance. The operation is implemented by modifying the number of replicas in the Kubernetes Deployment specification associated with a node instance and submitting the updated specification to the Kubernetes API. The scale operation works for increasing the number of replicas as well as decreasing the number of replications. The minimum number of replicas is 1.
259 The `scale` operation takes two parameters:
260 - `replicas`: Number of desired replicas. Integer, required.
261 - `max_wait`: Number of seconds to wait for successful completion of the operation. Integer, optional, defaults to 300 seconds.
263 One way to trigger a `scale` operation is by using the Cloudify command line. For example:
265 cfy executions start -d my_deployment -p scale_params.yaml execute_operation
267 where `my_deployment` is the name of an existing Cloudify deployment and
268 `scale_params.yaml` is a a file containing the operation parameters:
276 Note that the `node_ids` list is required by the `execute_operation` workflow. The list contains all of the nodes that are being targeted by the workflow. If a blueprint contains more than one node, it's possible to scale all of them--or some subset--with a single workflow execution.
278 ### Image Update Operation (`image_update`)
279 The `update_image` operation provides a way to change the Docker image running for a node instance, using the Kubernetes _rolling update_ strategy. (See this [tutorial](https://kubernetes.io/docs/tutorials/kubernetes-basics/update/update-intro/) and this [discussion of the concept](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#updating-a-deployment) in the Kubernetes documentation.) The operation is implemented by modifying the image property in the Kubernetes Deployment specification associated with a node instance and submitting the updated specification to the Kubernetes API.
281 The `update_image` operation takes two parameters:
282 - `image`: Full name (including registry, if not the default Docker registry, and tag) of the new image to use for the component. String, required.
283 - `max_wait`: Number of seconds to wait for successful completion of the operation. Integer, optional, defaults to 300 seconds.
285 The `update_image` operation can be triggered using the Cloudify command line. For example:
287 cfy executions start -d my_deployment -p update_params.yaml execute_operation
289 where `my_deployment` is the name of an existing Cloudify deployment and
290 `update_params.yaml` is a a file containing the operation parameters:
292 operation: update_image
294 image: myrepository.example.com/server/web:1.15
298 Note that the `node_ids` list is required by the `execute_operation` workflow. The list contains all of the nodes that are being targeted by the workflow. For an `update_image` operation, the list typically has only one element.
300 Note also that the `update_image` operation targets the container running the application code (i.e., the container running the image specified in the `image` node property). This plugin may deploy "sidecar" containers running supporting code--for example, the "filebeat" container that relays logs to the central log server. The `update_image` operation does not touch any "sidecar" containers.