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PROBLEM

We ran in to a lot of space issues with storing docker images in Azure cloud VMs. Because by default docker images, layers and containers are stored in the

/var/lib/docker

It is the same with the Amazon AWS as well.

The problem with this is most of the virtual machines have a very limited space in the OS Disk and the space can run out very soon. It is wise to save the docker images and attach your data containers to point a mount volume.

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import java.util.*;

/**
 * Created by rg3 on 10/17/17.
 */

public class UniqueStringTask {

    private static String findFirstUnique(String ...names){
        if (names.length ==0) {                     // Check for empty array

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/**
 * Created by rg3 on 10/17/17.
 */

import java.util.ArrayList;

public class NoOfStories {
    static int small=1;
    static int large=2;

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@Bean
public ClientHttpRequestFactory createRequestFactory(@Value("${connection.timeout}") String maxConn) {
    PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
     connectionManager.setMaxTotal(maxTotalConn);
     connectionManager.setDefaultMaxPerRoute(maxPerChannel);

    RequestConfig config = RequestConfig.custom().setConnectTimeout(100000).build();
    CloseableHttpClient httpClient = HttpClientBuilder.create().setConnectionManager(connectionManager)
            .setDefaultRequestConfig(config).build();
    return new HttpComponentsClientHttpRequestFactory(httpClient);

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When we were trying to create a docker image for our Node JS based application, we chose to use the official Node docker image (~700MB). On top of that we need to add the node modules, business logic, etc and so on. The final image size was staggering (~1.2GB). It was not what we wanted. Secondly, the average build time to do NPM install and run a grunt task totally took 15 minutes for every build. I am not even talking about the pain of configuring this for different CI/CD pipelines and environments.

The initial docker file was looking something like this:

Initial Docker File

FROM node:6.10.1-alpine

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docker build -t order-service:latest .

docker run -p 9910:8080 order-service:latest

docker images

docker ps # This will give the container id

docker exec -it <container id> /bin/sh

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• Go to start.spring.io
• Add service discovery, eureka or similar
• Eureka client in .Net - https://steeltoe.io/docs/steeltoe-discovery/
• 1. EnableDiscoverClient
• Change the port
• Give the application a name - because service discovery happens by name
• Circuit Breaker - Hystrix, Resilience4J, https://steeltoe.io/docs/steeltoe-circuitbreaker
• Chaos Engineering
• Log Analysis - ELK
• Metrics - Prometheus, InfluxDB (Time series database)