Book Image

Docker High Performance. - Second Edition

By : Allan Espinosa, Russ McKendrick
Book Image

Docker High Performance. - Second Edition

By: Allan Espinosa, Russ McKendrick

Overview of this book

Docker is an enterprise-grade container platform that allows you to build and deploy your apps. Its portable format lets you run your code right from your desktop workstations to popular cloud computing providers. This comprehensive guide will improve your Docker work?ows and ensure your application's production environment runs smoothly. This book starts with a refresher on setting up and running Docker and details the basic setup for creating a Docker Swarm cluster. You will then learn how to automate this cluster by using the Chef server and cookbooks. After that, you will run the Docker monitoring system with Prometheus and Grafana, and deploy the ELK stack. You will also learn best practices for optimizing Docker images. After deploying containers with the help of Jenkins, you will then move on to a tutorial on using Apache JMeter to analyze your application's performance. You will learn how to use Docker Swarm and NGINX to load-balance your application, and how common debugging tools in Linux can be used to troubleshoot Docker containers. By the end of this book, you will be able to integrate all the optimizations that you have learned and put everything into practice in your applications.
Table of Contents (16 chapters)
Title Page
Copyright and Credits
About Packt
Contributors
Preface
Index

Building and deploying a container


Now that Jenkins has been configured, we need to decide on an application to configure and deploy.

Preparing our application

If you recall, in Chapter 4Optimizing Docker Images, we created a simple Go application, which prints hello world to the screen when you open it in a browser. Dockerfile contained a multi-stage build that looked like the following:

FROM golang:1.11-stretch

ADD hello.go hello.go
RUN go build hello.go

FROM busybox
COPY --from=0 /go/hello /app/hello
COPY --from=0 /lib/x86_64-linux-gnu/libpthread.so.0 \
              /lib/x86_64-linux-gnu/libpthread.so.0
COPY --from=0 /lib/x86_64-linux-gnu/libc.so.6 /lib/x86_64-linux-gnu/libc.so.6
COPY --from=0 /lib64/ld-linux-x86-64.so.2 /lib64/ld-linux-x86-64.so.2
WORKDIR /app
EXPOSE 8080
ENTRYPOINT ["./hello"]

The hello.go file contains the following:

package main

import (
  "fmt"
  "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
  fmt.Fprintf(w, "hello world")
}

func main() ...