Deploy layotto pod in k8s.

[kevinten10]

What would you like to be added:

添加在k8s中快速部署一个layotto节点的方式。

就像k8s官方提供的示例，仅用一行kubectl即可完成部署：

https://kubernetes.io/zh-cn/docs/tasks/run-application/run-stateless-application-deployment/

kubectl apply -f https://k8s.io/examples/application/deployment.yaml

Why is this needed:

此部署并非layotto作为sidecar的部署方式，而是layotto作为一个单独pod的部署方式。

使用场景主要为：

• 支持本地调试：https://mosn.io/layotto/#/zh/operation/local
• quickstart，体验layotto
• 作为独立节点模式，与k8s集成。see: Proposal: make layotto more friendly in Cloud Native Ecosystem #392

[kevinten10]

1. 创建configMap
2. 创建deploymeny

apiVersion: v1
kind: ConfigMap
metadata:
    name: layotto-runtime-config
data:
  config.json: |
    {
      "servers": [
        {
          "default_log_path": "stdout",
          "default_log_level": "DEBUG",
          "routers": [
            {
              "router_config_name": "actuator_dont_need_router"
            }
          ],
          "listeners": [
            {
              "name": "grpc",
              "address": "0.0.0.0:34904",
              "bind_port": true,
              "filter_chains": [
                {
                  "filters": [
                    {
                      "type": "grpc",
                      "config": {
                        "server_name": "runtime",
                        "grpc_config": {
                          "hellos": {
                            "quick_start_demo": {
                              "type": "helloworld",
                              "hello": "greeting"
                            }
                          },
                          "state": {
                            "state_demo": {
                              "type": "in-memory",
                              "metadata": {
                              }
                            }
                          },
                          "lock": {
                            "lock_demo": {
                              "type": "in-memory",
                              "metadata": {
                              }
                            }
                          },
                          "pub_subs": {
                            "pub_subs_demo": {
                              "type": "in-memory",
                              "metadata": {
                                "consumerID": "1"
                              }
                            }
                          },
                          "sequencer": {
                            "sequencer_demo": {
                              "type": "in-memory",
                              "metadata": {}
                            }
                          },
                          "secret_store": {
                            "secret_demo": {
                              "type": "local.env",
                              "metadata": {
                              }
                            }
                          },
                          "bindings": {
                            "bindings_demo": {
                              "type": "http",
                              "metadata": {
                                "url": "https://mosn.io/layotto"
                              }
                            }
                          },
                          "custom_component": {
                            "helloworld": {
                              "demo": {
                                "type": "in-memory",
                                "metadata": {}
                              }
                            }
                          },
                          "app": {
                            "app_id": "app1",
                            "grpc_callback_port": 9999
                          }
                        }
                      }
                    }
                  ]
                }
              ]
            },
            {
              "name": "actuator",
              "address": "127.0.0.1:34999",
              "bind_port": true,
              "filter_chains": [
                {
                  "filters": [
                    {
                      "type": "proxy",
                      "config": {
                        "downstream_protocol": "Http1",
                        "upstream_protocol": "Http1",
                        "router_config_name": "actuator_dont_need_router"
                      }
                    }
                  ]
                }
              ],
              "stream_filters": [
                {
                  "type": "actuator_filter"
                }
              ]
            }
          ]
        }
      ],
      "tracing": {
        "enable": true,
        "driver": "SOFATracer",
        "config": {
          "generator": "mosntracing",
          "exporter": [
            "stdout"
          ]
        }
      },
      "metrics": {
        "sinks": [
          {
            "type": "prometheus",
            "config": {
              "port": 34903
            }
          }
        ]
      }
    }

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: layotto-runtime-deployment
  labels:
    app: layotto-runtime-deployment
spec:
  selector:
    matchLabels:
      app: layotto-runtime
  replicas: 1
  template:
    metadata:
      labels:
        app: layotto-runtime
    spec:
      containers:
      - name: layotto-runtime
        image: layotto/layotto:latest
        command: ["/runtime/layotto", "start"]
        args: ["-c", "/runtime/configs/config.json"]
        ports:
        - containerPort: 34904
        volumeMounts:
        - name: runtime-config
          mountPath: /runtime/configs
          readOnly: false
      volumes:
      - name: runtime-config
        configMap:
          name: layotto-runtime-config
          items:
          - key: config.json
            path: config.json

[kevinten10]

使用以上yaml我已经成功部署到k8s中。

configmap配置copy from：https://github.com/mosn/layotto/blob/main/configs/config.json

[kevinten10]

我觉得可以拆成3个yaml，提交到仓库中：

1. configmap.yaml：提供一份默认配置
2. deployment.yaml：同以上deployment
3. layotto-deploy-default.yaml：使用默认configmap，部署以上deployment

这样用户可以直接部署到k8s中，类似：

kubectl apply -f https://layotto/deploy/layotto-deploy-default.yaml

如果想自行修改配置，也可以自己提供一个configmap，再使用上面的deployment.yaml

[seeflood]

lgtm. It makes local development much easier !

@Xunzhuo Could u help review this proposal?

[seeflood]

使用场景主要为：
....
作为独立节点模式，与k8s集成

如何理解“独立节点模式”?

[kevinten10]

因为上面的deployment中只有一个layotto的容器

所以使layotto不是作为sidecar部署

部署一个pod，pod中只有一个layotto容器，我称它为"独立节点模式"

[seeflood]

@kevinten10 OK. So the benefits of the "standalone mode" is still to make the local development easier, right?
LGTM. Could u help submit a PR for it?

[kevinten10]

Yes, I will submit a PR~

[kevinten10]

@seeflood I plan to put the deployment yaml in this directory, please help to see if it is ok:

/layotto/demo/deploy/k8s/standalone/

1. default_configmap.yaml
2. default_deployment.yaml
3. default_quickstart.yaml (1+2)

[seeflood]

@kevinten10 LGTM