{"id":24179,"date":"2019-02-26T12:15:59","date_gmt":"2019-02-26T10:15:59","guid":{"rendered":"https:\/\/www.webcodegeeks.com\/?p=24179"},"modified":"2019-02-26T10:46:01","modified_gmt":"2019-02-26T08:46:01","slug":"docker-basics-docker-compose","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/devops\/docker-basics-docker-compose\/","title":{"rendered":"Docker basics: Docker compose"},"content":{"rendered":"\n

Docker Compose is a tool that allows you to run multi-container applications. With compose we can use yaml files to configure our application\u2019 services and then using a single command create and start all of the configured services. I use this tool a lot when it comes to local development in a microservice environment. It is also lightweight and needs just a small effort. Instead of managing how to run each service while developing you can have the environment and services needed preconfigured and focus on the service that you currently develop.<\/p>\n\n\n\n

With docker compose we can configure a network for our services, volumes, mount-points, environmental variables just about everything.
To showcase this we are going to solve a problem. Our goal would be to extract data from mongodb using grafana. Grafana does not have out of the box support for MongoDB therefore we will have to use a plugin<\/a>.<\/p>\n\n\n\n

First step we shall create our networks. Creating a network is not necessary since your services once started will join the default network. We shall make a showcase of using custom networks. We shall have a network for backend services and a network for frontend services. Apparently network configuration can get more advanced and specify custom network<\/a> drivers or even configure static addresses<\/a>.<\/p>\n\n\n\n

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version: <\/code>'3.5'<\/code><\/div>\n
 <\/div>\n
networks:<\/code><\/div>\n
  <\/code>frontend:<\/code><\/div>\n
    <\/code>name: frontend<\/code>-<\/code>network<\/code><\/div>\n
  <\/code>backend:<\/code><\/div>\n
    <\/code>name: backend<\/code>-<\/code>network<\/code><\/div>\n
    <\/code>internal: true<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

The backend network is going to be internal therefore there won\u2019t be any outbound connectivity to the containers attached to it.<\/p>\n\n\n\n

Then we shall setup our mongodb instance.<\/p>\n\n\n\n

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version: <\/code>'3.5'<\/code><\/div>\n
 <\/div>\n
services:<\/code><\/div>\n
  <\/code>mongo:<\/code><\/div>\n
    <\/code>image: mongo<\/code><\/div>\n
    <\/code>restart: always<\/code><\/div>\n
    <\/code>environment:<\/code><\/div>\n
      <\/code>MONGO_INITDB_ROOT_USERNAME: ${MONGO_USER}<\/code><\/div>\n
      <\/code>MONGO_INITDB_ROOT_PASSWORD: ${MONGO_PASSWORD}<\/code><\/div>\n
    <\/code>volumes:<\/code><\/div>\n
      <\/code>-<\/code> ${DB_PATH}:<\/code>\/<\/code>data<\/code>\/<\/code>db<\/code><\/div>\n
    <\/code>networks:<\/code><\/div>\n
      <\/code>-<\/code> backend<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

As you see we specified a volume. Volumes can also be specified separately and attach them to a service.
Also we used environmental variables for the root account, you might as well have spotted that the password is going to be provided through environmental variables ie. MONGO_USER=root MONGO_PASSWORD=root docker-compose -f stack.yaml up. The same applies for the volume path too. You can have a more advanced configuration for volumes in your compose configuration and reference them from your service.<\/p>\n\n\n\n

Our next goal is to setup the proxy server which shall be in the middle of our grafana and mongodb server. Since it needs a custom Dockerfile to create it, we shall do it through docker-compose. Compose has the capability to spin up a service by specifying the docker file.<\/p>\n\n\n\n

So let\u2019s start with the Dockerfile.<\/p>\n\n\n\n

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FROM node<\/code><\/div>\n
 <\/div>\n
WORKDIR <\/code>\/usr\/src\/mongografanaproxy<\/code><\/div>\n
 <\/div>\n
COPY . <\/code>\/usr\/src\/mongografanaproxy<\/code><\/div>\n
 <\/div>\n
EXPOSE 3333<\/code><\/div>\n
 <\/div>\n
RUN <\/code>cd<\/code> \/usr\/src\/mongografanaproxy<\/code><\/div>\n
RUN npm <\/code>install<\/code><\/div>\n
ENTRYPOINT [<\/code>\"npm\"<\/code>,<\/code>\"run\"<\/code>,<\/code>\"server\"<\/code>]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Then let\u2019s add it to compose<\/p>\n\n\n\n

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version: <\/code>'3.5'<\/code><\/div>\n
 <\/div>\n
services:<\/code><\/div>\n
  <\/code>mongo-proxy:<\/code><\/div>\n
    <\/code>build:<\/code><\/div>\n
      <\/code>context: .<\/code><\/div>\n
      <\/code>dockerfile: ProxyDockerfile<\/code><\/div>\n
    <\/code>restart: always<\/code><\/div>\n
    <\/code>networks:<\/code><\/div>\n
      <\/code>- backend<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

And the same shall be done to the Grafana image that we want to use. In stead of using a ready grafana image we shall create one with the plugin preinstalled.<\/p>\n\n\n\n

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FROM grafana<\/code>\/grafana<\/code><\/div>\n
 <\/div>\n
COPY . <\/code>\/var\/lib\/grafana\/plugins\/mongodb-grafana<\/code><\/div>\n
 <\/div>\n
EXPOSE 3000<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n
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version: <\/code>'3.5'<\/code><\/div>\n
 <\/div>\n
services:<\/code><\/div>\n
  <\/code>grafana:<\/code><\/div>\n
    <\/code>build:<\/code><\/div>\n
      <\/code>context: .<\/code><\/div>\n
      <\/code>dockerfile: GrafanaDockerfile<\/code><\/div>\n
    <\/code>restart: always<\/code><\/div>\n
    <\/code>ports:<\/code><\/div>\n
      <\/code>- 3000:3000<\/code><\/div>\n
    <\/code>networks:<\/code><\/div>\n
      <\/code>- backend<\/code><\/div>\n
      <\/code>- frontend<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

Let\u2019s wrap them all together<\/p>\n\n\n\n

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version: <\/code>'3.5'<\/code><\/div>\n
 <\/div>\n
services:<\/code><\/div>\n
  <\/code>mongo:<\/code><\/div>\n
    <\/code>image: mongo<\/code><\/div>\n
    <\/code>restart: always<\/code><\/div>\n
    <\/code>environment:<\/code><\/div>\n
      <\/code>MONGO_INITDB_ROOT_USERNAME: ${MONGO_USER}<\/code><\/div>\n
      <\/code>MONGO_INITDB_ROOT_PASSWORD: ${MONGO_PASSWORD}<\/code><\/div>\n
    <\/code>volumes:<\/code><\/div>\n
      <\/code>-<\/code> ${DB_PATH}:<\/code>\/<\/code>data<\/code>\/<\/code>db<\/code><\/div>\n
    <\/code>networks:<\/code><\/div>\n
      <\/code>-<\/code> backend<\/code><\/div>\n
  <\/code>mongo<\/code>-<\/code>proxy:<\/code><\/div>\n
    <\/code>build:<\/code><\/div>\n
      <\/code>context: .<\/code><\/div>\n
      <\/code>dockerfile: ProxyDockerfile<\/code><\/div>\n
    <\/code>restart: always<\/code><\/div>\n
    <\/code>networks:<\/code><\/div>\n
      <\/code>-<\/code> backend<\/code><\/div>\n
  <\/code>grafana:<\/code><\/div>\n
    <\/code>build:<\/code><\/div>\n
      <\/code>context: .<\/code><\/div>\n
      <\/code>dockerfile: GrafanaDockerfile<\/code><\/div>\n
    <\/code>restart: always<\/code><\/div>\n
    <\/code>ports:<\/code><\/div>\n
      <\/code>-<\/code> 3000<\/code>:<\/code>3000<\/code><\/div>\n
    <\/code>networks:<\/code><\/div>\n
      <\/code>-<\/code> backend<\/code><\/div>\n
      <\/code>-<\/code> frontend<\/code><\/div>\n
networks:<\/code><\/div>\n
  <\/code>frontend:<\/code><\/div>\n
    <\/code>name: frontend<\/code>-<\/code>network<\/code><\/div>\n
  <\/code>backend:<\/code><\/div>\n
    <\/code>name: backend<\/code>-<\/code>network<\/code><\/div>\n
    <\/code>internal: true<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

So let\u2019s run them all together.<\/p>\n\n\n\n

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docker-compose -f stack.yaml build<\/code><\/div>\n
MONGO_USER=root MONGO_PASSWORD=root DB_PATH=~<\/code>\/grafana-mongo<\/code>  docker-compose -f stack.yaml up<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n\n\n\n

The above can be found on github<\/a>.<\/p>\n\n\n\n

You might as well find the Docker Images<\/a>, Docker Containers<\/a> and Docker registry<\/a> posts useful.<\/p>\n\n\n\n

\n\n\n\n
\n

Published on Web Code Geeks with permission by Emmanouil Gkatziouras, partner at our WCG program<\/a>. See the original article here: Docker basics: Docker compose<\/a><\/p>\n

Opinions expressed by Web Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Docker Compose is a tool that allows you to run multi-container applications. With compose we can use yaml files to configure our application\u2019 services and then using a single command create and start all of the configured services. I use this tool a lot when it comes to local development in a microservice environment. It …<\/p>\n","protected":false},"author":99,"featured_media":10356,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[217],"class_list":["post-24179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops","tag-docker"],"yoast_head":"\nDocker basics: Docker compose - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn about Docker compose? 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