docker-nginx-blue-green's Introduction

Docker blue green upstreams for nginx with ngx_http_perl_module

Proof of concept for blue-green upstream proxy with nginx + ngx_http_perl_module.

Docker run

This method pulls the latest image from Docker Hub. Ready for use as a stateless container proxy for use on container platforms like ECS, EKS

Objectives

Set up environment file and docker run
Print current upstream
Switch upstream
Clean up container

Copy sample environment file, modify values to suit, and docker run

# cp .env.sample .env
# docker run -p 80:80 -d --name nginx --env-file ./.env meappy/nginx-blue-green

Print current upstream

# docker exec -it nginx /deploy.py -p
Current deploy status: apache:80

Switch upstream

# docker exec -it nginx /deploy.py -d green
Current deploy status: apache:81

Clean up container

# docker stop nginx
# docker rm nginx

Docker Compose method

This method pulls an nginx image from Docker Hub. Docker volume is used with deploy script. Good for use as stateful setup where persistent storage is used.

Objectives

Start up nginx + Apache containers
Setup config.ini and deploy blue or green upstream
Test

Start up nginx + Apache containers

docker-compose up -d

Setup config.ini and deploy blue or green upstream

# cp config.ini.sample config.ini

# ./deploy.py -d blue 
Current deploy status: blue:8081

Test

# ./deploy.py -p 
Current deploy status: blue:8081

# curl -H 'Host: poc' -k -iL http://127.0.0.1
HTTP/1.1 200 OK
Server: nginx/1.15.12
Date: Thu, 23 May 2019 07:19:00 GMT
Content-Type: text/html
Content-Length: 45
Connection: keep-alive
Last-Modified: Mon, 11 Jun 2007 18:53:14 GMT
ETag: "2d-432a5e4a73a80"
Accept-Ranges: bytes

<html><body><h1>It works!</h1></body></html>

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