Description

Small image (~6.44MB) based on alpine (version 3.8), to run 2048 app cloned from Gabriel repo, with nginx.

How to run

• Step 1 : Clone repo

$ git clone git@github.com:ykaaouachi/2048.git

• Step 2 : Build new image 🚧

$ cd /dir/repo/2048
$ docker build -t ykaaouachi/2048:v1.0-alpine.3.8-nginx .

Sending build context to Docker daemon  636.9kB
Step 1/9 : FROM alpine:3.8
 ---> 196d12cf6ab1
Step 2/9 : LABEL version="1.0.0"  maintainer="Youssef KAAOUACHI<ykaaouachi@gmail.com>"   description="Image based on alpine v3.8, to run 2048 app on nginx"
 ---> Using cache
 ---> 9891aa0e8bcc
Step 3/9 : ARG APP_PATH=/usr/share/nginx/html
 ---> Using cache
 ---> 63a024e7087f
Step 4/9 : RUN apk --update add nginx &&     rm -rf /var/cache/apk/* &&     mkdir -p /run/nginx
 ---> Using cache
 ---> e2775c71a5e7
Step 5/9 : COPY conf/nginx/nginx-nobody-user.conf /etc/nginx/nginx.conf
 ---> Using cache
 ---> b915e46a4851
Step 6/9 : COPY 2048 ${APP_PATH}
 ---> Using cache
 ---> faa8b21624f1
Step 7/9 : EXPOSE 80
 ---> Using cache
 ---> bfff85654851
Step 8/9 : HEALTHCHECK CMD /usr/bin/nc 127.0.0.1 80 < /dev/null || exit 1
 ---> Using cache
 ---> 99595e727daf
Step 9/9 : CMD ["nginx", "-g", "daemon off;"]
 ---> Using cache
 ---> a751a085e3f9
Successfully built a751a085e3f9
Successfully tagged ykaaouachi/2048:v1.0-alpine.3.8-nginx
Tagging alpine@sha256:8fe3a924c6d74fc9dfeabece9aff67f4481034bda815c8b9cad4964db084fbca as alpine:3.8

• Step 3 : Sign your image (Docker best practice) For security needs, add this env variable :

$ export DOCKER_CONTENT_TRUST=1

For more details : docker documentation

Now, to sign 📑 our image, use docker trust sign Docker command :

$ docker trust sign ykaaouachi/2048:v1.0-alpine.3.8-nginx

• Step 4 : Run container 🚀

$ docker run -d --name 2048 -p 8080:80 ykaaouachi/2048:v1.0-alpine.3.8-nginx
43551384f420c80283063864b8cdd160bce01d9e93e57d687175e8a9da097dd0

• Step 5 : Check if everything is OK 🚦

List running containers, we must see our container (2048) :

$ docker ps 

And to check that root user run nginx master process & nobody user run nginx worker process :

$ docker exec 2048 ps aux | grep -i nginx | grep -v grep
    1 root      0:00 nginx: master process nginx -g daemon off;
    6 nobody    0:00 nginx: worker process

• Step 6 : Docker Health check

When run docker ps, we must see '(healthy)' on STATUS :

$ docker ps
CONTAINER ID  IMAGE                                  ...  STATUS                  PORTS                NAMES
8dd6cea8a447  ykaaouachi/2048:v1.0-alpine.3.8-nginx  ...  Up 13 minutes (healthy) 0.0.0.0:8080->80/tcp 2048

• Step 7 : Start game

• If you run Docker on host machine : Launch on your browser http://localhost:8080/
• If you use VM to run Docker : launch http://<IP.ADDRESS.VM.MACHINE>:8080/

And, Voilaa :

Destroy Docker object

• Remove 2048 container :

$ docker kill 2048 && docker rm 2048

• Remove 2048 image

$ docker rmi ykaaouachi/2048:v1.0-alpine.3.8-nginx

References

• Docker documentation,
• Content trust in Docker,
• Gabriel repo,
• To fix some issues with nginx,
• ...