goservice

Golang Rest service based on gorilla, gorm using Spring cloud config and PostgreSql

using

• "context"
• "os"
• "os/signal"
• "syscall"
• "fmt"
• "time"
• "net/http"
• "net/http/httputil"
• "log"
• "encoding/json"
• "github.com/gorilla/mux"
• "github.com/gorilla/handlers"
• "github.com/jinzhu/gorm"
• "github.com/jinzhu/gorm/dialects/postgres"
• "github.com/jinzhu/gorm/dialects/sqlite"
• "github.com/satori/go.uuid"
• "github.com/joho/godotenv"
• "github.com/prometheus/client_golang/prometheus/promhttp"

build

• go get -d -v
• go clean
• go build

build windows

• install https://jmeubank.github.io/tdm-gcc/
• go get github.com/mattn/go-sqlite3 in windows shell

depends on

• PostgreSQL instance: https://github.com/wlanboy/Dockerfiles/tree/master/Postgres

run

• go run main.go

debug

• go get -u github.com/go-delve/delve/cmd/dlv
• dlv debug ./goservice

dockerize (docker image size is 9.89MB)

• GOOS=linux GOARCH=386 go build (386 needed for busybox)
• GOOS=linux GOARCH=arm GOARM=6 go build (Raspberry Pi build)
• GOOS=linux GOARCH=arm64 go build (Odroid C2 build)
• docker build -t goservice .

Docker publish to github registry

• docker tag goservice:latest docker.pkg.github.com/wlanboy/goservice/goservice:latest
• docker push docker.pkg.github.com/wlanboy/goservice/goservice:latest

Docker Hub

• https://hub.docker.com/r/wlanboy/goservice

Docker Registry repro

• https://github.com/wlanboy/goservice/packages/278503

run docker container

*docker run -d -p 8000:8000 goservice

Kubernets deployment

Prepare

cd ~
git clone https://github.com/wlanboy/goservice.git

check you local kubectl

kubectl cluster-info
kubectl get pods --all-namespaces

deploy service on new namespace

cd ~/goservice
kubectl create namespace go
kubectl apply -f goservice-deployment.yaml
kubectl apply -f goservice-service.yaml
kubectl get pods -n go -o wide

check deployment and service

kubectl describe deployments -n go goservice 
kubectl describe services -n gp goservice-service

expose service and get node port

kubectl expose deployment -n go goservice --type=NodePort --name=goservice-serviceexternal --port 8000
kubectl describe services -n go goservice-serviceexternal 

Result:

Name:                     goservice-serviceexternal
Namespace:                go
Labels:                   app=goservice
Annotations:              <none>
Selector:                 app=goservice
Type:                     NodePort
IP Family Policy:         SingleStack
IP Families:              IPv4
IP:                       10.108.40.139
IPs:                      10.108.40.139
Port:                     <unset>  8000/TCP
TargetPort:               8002/TCP
NodePort:                 <unset>  30413/TCP  <--- THIS IS THE PORT WE NEED
Endpoints:                10.10.0.8:8000
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

call microservice

• curl http://192.168.56.100:30413/api/v1/event

create event

• curl -X POST http://127.0.0.1:8000/api/v1/event -H 'Content-Type: application/json' -d '{"name": "test", "type": "info"}'

get all events

• curl -X GET http://127.0.0.1:8000/api/v1/event

get prometheus metrics

• curl -X GET http://127.0.0.1:8000/metrics