├── LICENSE ├── README.md ├── config-sidecar ├── Dockerfile └── main.go ├── configs └── user.toml ├── deployments └── hello-habitat.yaml ├── habitat ├── config │ └── config.json ├── default.toml └── plan.sh ├── main.go └── services └── hello-habitat.yaml /LICENSE: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. Definitions. 9 | 10 | "License" shall mean the terms and conditions for use, reproduction, 11 | and distribution as defined by Sections 1 through 9 of this document. 12 | 13 | "Licensor" shall mean the copyright owner or entity authorized by 14 | the copyright owner that is granting the License. 15 | 16 | "Legal Entity" shall mean the union of the acting entity and all 17 | other entities that control, are controlled by, or are under common 18 | control with that entity. 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We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Hello Habitat 2 | -------------------------------------------------------------------------------- /config-sidecar/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM ubuntu:16.04 2 | MAINTAINER Kelsey Hightower 3 | ADD config-sidecar /config-sidecar 4 | ADD hab /usr/bin/hab 5 | ENTRYPOINT ["/config-sidecar"] 6 | -------------------------------------------------------------------------------- /config-sidecar/main.go: -------------------------------------------------------------------------------- 1 | // Copyright 2017 Google Inc. All Rights Reserved. 2 | // Licensed under the Apache License, Version 2.0 (the "License"); 3 | // you may not use this file except in compliance with the License. 4 | // 5 | // You may obtain a copy of the License at 6 | // http://www.apache.org/licenses/LICENSE-2.0 7 | // 8 | // Unless required by applicable law or agreed to in writing, software 9 | // distributed under the License is distributed on an "AS IS" BASIS, 10 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 | // See the License for the specific language governing permissions and 12 | // limitations under the License. 13 | 14 | package main 15 | 16 | import ( 17 | "flag" 18 | "log" 19 | "os" 20 | "os/exec" 21 | "os/signal" 22 | "strconv" 23 | "syscall" 24 | "time" 25 | 26 | "github.com/fsnotify/fsnotify" 27 | ) 28 | 29 | var ( 30 | configFile string 31 | configVersion int 32 | serviceGroup string 33 | watcher *fsnotify.Watcher 34 | ) 35 | 36 | func main() { 37 | flag.StringVar(&configFile, "user-configuration-file", "/etc/habitat/user.toml", "Path to service configuration") 38 | flag.StringVar(&serviceGroup, "service-group", "", "The Habitat service group") 39 | flag.Parse() 40 | 41 | configVersion = 1 42 | 43 | log.Println("Starting the Habitat config sidecar...") 44 | 45 | if err := loadConfig(); err != nil { 46 | log.Fatal(err) 47 | } 48 | 49 | if err := newWatcher(); err != nil { 50 | log.Fatal(err) 51 | } 52 | 53 | go func() { 54 | for { 55 | if watcher == nil { 56 | if err := resetWatcher(); err != nil { 57 | log.Println(err) 58 | } 59 | time.Sleep(5 * time.Second) 60 | continue 61 | } 62 | 63 | select { 64 | case <-watcher.Events: 65 | if err := loadConfig(); err != nil { 66 | log.Println(err) 67 | } 68 | if err := resetWatcher(); err != nil { 69 | log.Println(err) 70 | } 71 | case err := <-watcher.Errors: 72 | log.Println(err) 73 | } 74 | } 75 | }() 76 | 77 | signalChan := make(chan os.Signal, 1) 78 | signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM) 79 | <-signalChan 80 | 81 | log.Printf("Shutdown signal received, exiting...") 82 | } 83 | 84 | func newWatcher() error { 85 | var err error 86 | watcher, err = fsnotify.NewWatcher() 87 | if err != nil { 88 | return err 89 | } 90 | return watcher.Add(configFile) 91 | } 92 | 93 | func resetWatcher() error { 94 | err := watcher.Close() 95 | if err != nil { 96 | return err 97 | } 98 | return newWatcher() 99 | } 100 | 101 | func loadConfig() error { 102 | out, err := exec.Command("hab", "config", "apply", serviceGroup, 103 | strconv.Itoa(configVersion), configFile).CombinedOutput() 104 | if err != nil { 105 | log.Println(string(out)) 106 | return err 107 | } 108 | 109 | log.Println(string(out)) 110 | configVersion += 1 111 | 112 | return nil 113 | } 114 | -------------------------------------------------------------------------------- /configs/user.toml: -------------------------------------------------------------------------------- 1 | go_max_procs=0 2 | -------------------------------------------------------------------------------- /deployments/hello-habitat.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: apps/v1beta1 2 | kind: Deployment 3 | metadata: 4 | labels: 5 | app: hello-habitat 6 | name: hello-habitat 7 | spec: 8 | template: 9 | metadata: 10 | labels: 11 | app: hello-habitat 12 | spec: 13 | containers: 14 | - name: hello-habitat 15 | image: "gcr.io/hightowerlabs/hello-habitat:0.0.1-20170524080850" 16 | ports: 17 | - name: http 18 | containerPort: 8080 19 | protocol: TCP 20 | - name: liveness-port 21 | containerPort: 9631 22 | protocol: TCP 23 | livenessProbe: 24 | httpGet: 25 | path: /services/hello-habitat/default/health 26 | port: 9631 27 | initialDelaySeconds: 5 28 | periodSeconds: 10 29 | resources: 30 | requests: 31 | cpu: 500m 32 | memory: 256Mi 33 | - name: habitat-config-sidecar 34 | image: "gcr.io/hightowerlabs/habitat-config-sidecar:0.0.4" 35 | args: 36 | - "--service-group=hello-habitat.default" 37 | resources: 38 | requests: 39 | cpu: 500m 40 | memory: 256Mi 41 | volumeMounts: 42 | - name: "hello-habitat-config" 43 | mountPath: "/etc/habitat" 44 | volumes: 45 | - name: "hello-habitat-config" 46 | configMap: 47 | name: "hello-habitat" 48 | -------------------------------------------------------------------------------- /habitat/config/config.json: -------------------------------------------------------------------------------- 1 | { 2 | "go_max_procs": {{cfg.go_max_procs}} 3 | } 4 | -------------------------------------------------------------------------------- /habitat/default.toml: -------------------------------------------------------------------------------- 1 | go_max_procs = 0 2 | 3 | [server] 4 | http = 8080 5 | -------------------------------------------------------------------------------- /habitat/plan.sh: -------------------------------------------------------------------------------- 1 | pkg_name="hello-habitat" 2 | pkg_description="Hello Habitat demo application." 3 | pkg_origin="kelseyhightower" 4 | pkg_version="0.1.0" 5 | pkg_license=('Apache-2.0') 6 | pkg_upstream_url="https://github.com/kelseyhightower/hello-habitat" 7 | 8 | pkg_svc_run="hello-habitat --config-file ${pkg_svc_config_path}/config.json" 9 | pkg_svc_user="hab" 10 | pkg_svc_group="${pkg_svc_user}" 11 | pkg_bin_dirs=(bin) 12 | 13 | pkg_exports=( 14 | [http]=server.http 15 | ) 16 | pkg_exposes=(http) 17 | 18 | pkg_build_deps=(core/go) 19 | 20 | do_build() { 21 | pushd "${PLAN_CONTEXT}"/.. > /dev/null 22 | go build -o hello-habitat . 23 | popd > /dev/null 24 | } 25 | 26 | do_install() { 27 | mkdir -p "${pkg_prefix}/bin" 28 | cp "${PLAN_CONTEXT}"/../hello-habitat "${pkg_prefix}/bin" 29 | } 30 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | // Copyright 2017 Google Inc. All Rights Reserved. 2 | // Licensed under the Apache License, Version 2.0 (the "License"); 3 | // you may not use this file except in compliance with the License. 4 | // 5 | // You may obtain a copy of the License at 6 | // http://www.apache.org/licenses/LICENSE-2.0 7 | // 8 | // Unless required by applicable law or agreed to in writing, software 9 | // distributed under the License is distributed on an "AS IS" BASIS, 10 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 11 | // See the License for the specific language governing permissions and 12 | // limitations under the License. 13 | 14 | package main 15 | 16 | import ( 17 | "encoding/json" 18 | "flag" 19 | "fmt" 20 | "io/ioutil" 21 | "log" 22 | "net/http" 23 | "os" 24 | ) 25 | 26 | var ( 27 | configFile string 28 | ) 29 | 30 | type Config struct { 31 | Hostname string `json:"hostname"` 32 | MaxProcs int `json:"go_max_procs"` 33 | } 34 | 35 | func main() { 36 | flag.StringVar(&configFile, "config-file", "", "The configuration file") 37 | flag.Parse() 38 | 39 | hostname, err := os.Hostname() 40 | if err != nil { 41 | log.Fatal("Error getting hostname") 42 | } 43 | 44 | log.Println("Starting the hello-habitat service...") 45 | 46 | data, err := ioutil.ReadFile(configFile) 47 | if err != nil { 48 | log.Fatalf("Error loading configuration file: %v", err) 49 | } 50 | 51 | var config Config 52 | err = json.Unmarshal(data, &config) 53 | if err != nil { 54 | log.Fatalf("Error loading configuration file: %v", err) 55 | } 56 | 57 | config.Hostname = hostname 58 | 59 | http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { 60 | fmt.Fprintf(w, "Hello Habitat!\n") 61 | }) 62 | 63 | http.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) { 64 | fmt.Fprintf(w, "Hello Habitat Version: 1.0.0\n") 65 | }) 66 | 67 | http.HandleFunc("/config", func(w http.ResponseWriter, r *http.Request) { 68 | data, err := json.MarshalIndent(config, "", " ") 69 | if err != nil { 70 | log.Printf("error formatting JSON response: %v", err) 71 | http.Error(w, "Error loading the internal configuration", 500) 72 | return 73 | } 74 | w.Write(data) 75 | fmt.Fprintf(w, "\n") 76 | }) 77 | 78 | log.Fatal(http.ListenAndServe(":8080", nil)) 79 | } 80 | -------------------------------------------------------------------------------- /services/hello-habitat.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: v1 2 | kind: Service 3 | metadata: 4 | labels: 5 | app: hello-habitat 6 | name: hello-habitat 7 | spec: 8 | ports: 9 | - port: 80 10 | protocol: TCP 11 | targetPort: 8080 12 | selector: 13 | app: hello-habitat 14 | type: LoadBalancer 15 | --------------------------------------------------------------------------------