Friday, June 9, 2017

Deploy Golang Web Application to Heroku cloud Platform

Deploy Golang Web Application to Heroku cloud Platform


Here I will provide you the details to deploy simple golang web application on Heroku. 

I hope reader of this post has already installed Golang package and have basic knowledge about golang and basic skill about git not mandatory.

I am using go1.6 version on Linux-Ubuntu machine for this post.

sujin@sujin:~$ lsb_release -d
Description: Ubuntu 14.04.4 LTS

sujin@sujin:~$ go version
go version go1.6 linux/amd64

Setup Go directory structure and set GOPATH env variable. add GOPATH/bin to PATH env variable.

set working directory in GOPATH

sujin@sujin:~$ echo $GOPATH
/home/sujin/godir/work

create a simple web app in golang. For this example i create a folder called HerokuTest, inside a file called HerokuTest.go that contain program below

package main



import (

"fmt"

"net/http"

"os"
)

func homeHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, " Hello World From Golang on Heroku")
}

func main() {
http.HandleFunc("/", homeHandler)

fmt.Println("Server Listening...")
err := http.ListenAndServe(":"+os.Getenv("PORT"), nil)
if err != nil {
panic("ListenAndServe")
}
}

Compile and test the program locally

sujin@sujin:~/godir/work/src/blog/HerokuTest$ go build
sujin@sujin:~/godir/work/src/blog/HerokuTest$ ls
HerokuTest  HerokuTest.go
sujin@sujin:~/godir/work/src/blog/HerokuTest$ PORT=7070 HerokuTest 
Server Listening...

Go to the url http://127.0.0.1:7070/ from web browser it will print Hello World From Golang on Heroku in web page.

We should manage dependency package using Godep

install godep

go get github.com/kr/godep

save all golang dependencies

sujin@sujin:~/godir/work/src/blog/HerokuTest$ godep savesujin@sujin:~/godir/work/src/blog/HerokuTest$ ls Godeps HerokuTest HerokuTest.go

We should create Procfile to tell Heroku which command to execute on web

sujin@sujin:~/godir/work/src/blog/HerokuTest$ echo web: HerokTest > Procfile

Now its time to configure git for the project.

git init
git add .
git git commit -m "Heroku Test Project Initial Commit"
git remote add origin https://github.com/sujinsr/HerokuTest.git
git push origin master


Register in heroku website to get free account https://signup.heroku.com/?c=70130000001x9jFAAQ


install heroku tool belt

sujin@sujin:~/godir/work/src/blog$ heroku login
Enter your Heroku credentials.
Email: sujinsr@gmail.com
Password (typing will be hidden): 
Logged in as sujinsr@gmail.com


Pull the HerokuTest project from git

go get github.com/sujinsr/HerokuTest/...


Move to project directory and create heroku instance for your application




sujin@sujin:~/godir/work/src/github.com/sujinsr/HerokuTest$ heroku create heroku-test-app-blog -b https://github.com/kr/heroku-buildpack-go.git
Creating heroku-test-app-blog... done, stack is cedar-14
Setting buildpack to https://github.com/kr/heroku-buildpack-go.git... done
https://heroku-test-app-blog.herokuapp.com/ | https://git.heroku.com/heroku-test-app-blog.git

Now push your application to git heroku master

sujin@sujin:~/godir/work/src/github.com/sujinsr/HerokuTest$ git push heroku master
Counting objects: 14, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (12/12), done.
Writing objects: 100% (14/14), 1.48 KiB | 0 bytes/s, done.
Total 14 (delta 2), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Fetching set buildpack https://github.com/kr/heroku-buildpack-go.git... done
remote: -----> Go app detected
remote: -----> Checking Godeps/Godeps.json file.
remote: -----> Installing go1.6... done
remote: -----> Running: godep go install -tags heroku ./...
remote: 
remote: -----> Discovering process types
remote:        Procfile declares types -> web
remote: 
remote: -----> Compressing...
remote:        Done: 2.2M
remote: -----> Launching...
remote:        Released v3
remote:        https://heroku-test-app-blog.herokuapp.com/ deployed to Heroku
remote: 
remote: Verifying deploy.... done.
To https://git.heroku.com/heroku-test-app-blog.git
 * [new branch]      master -> master

Check whether application running

sujin@sujin:~/godir/work/src/github.com/sujinsr/HerokuTest$ heroku ps
=== web (Free): HerokuTest (1)
web.1: up 2016/02/28 14:09:45 +0530 (~ 37s ago)

Check the aplication by running heroku open

sujin@sujin:~/godir/work/src/github.com/sujinsr/HerokuTest$ heroku open
Opening heroku-test-app-blog... done
Created new window in existing browser session.


Check the logs 

sujin@sujin:~/godir/work/src/github.com/sujinsr/HerokuTest$ heroku logs --tail
2016-02-28T08:38:42.408669+00:00 heroku[api]: Enable Logplex by sujinsr@gmail.com
2016-02-28T08:38:42.408669+00:00 heroku[api]: Release v2 created by sujinsr@gmail.com
2016-02-28T08:39:43.323594+00:00 heroku[api]: Scale to web=1 by sujinsr@gmail.com
2016-02-28T08:39:43.566013+00:00 heroku[slug-compiler]: Slug compilation started
2016-02-28T08:39:43.566018+00:00 heroku[slug-compiler]: Slug compilation finished
2016-02-28T08:39:43.414709+00:00 heroku[api]: Deploy 51ae268 by sujinsr@gmail.com
2016-02-28T08:39:43.414779+00:00 heroku[api]: Release v3 created by sujinsr@gmail.com
2016-02-28T08:39:44.250976+00:00 heroku[web.1]: Starting process with command `HerokuTest`
2016-02-28T08:39:45.250323+00:00 app[web.1]: Server Listening...
2016-02-28T08:39:45.844980+00:00 heroku[web.1]: State changed from starting to up


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