I'm using Docker for Mac. I have two containers. 1st: A PHP application that is attempting to connect to localhost:3306 to MySQL.
2nd: MySQL When running with links, they are able to reach each other. However, I would like to avoid changing any of the code in the PHP application (e.g. Changing localhost to 'mysql') and stay with using localhost. Host networking seems to do the trick, the problem is, when I enable host networking I can't access the PHP application on port 80 on my host mac.
If I docker exec -it into the php application and curl localhost, i see the HTML, so it looks like the port is just not forwarding to the host machine? This is an example for docker-compose it runs mysql in one container and phpmyadmin in another the containers are linked together you can access the containers via your host machine on the ports 3316 and 8889 mymysql: image: mysql/mysql-server:latest containername: mymysql environment: - MYSQLROOTPASSWORD=1234 - MYSQLDATABASE=test - MYSQLUSER=test - MYSQLPASSWORD=test ports: - 3316:3306 restart: always phpmyadmin: image: phpmyadmin/phpmyadmin containername: mymyadmin links: - mymysql:mymysql environment: - PMAARBITRARY=0 - PMAHOST=mymysql ports: - 8889:80 restart: always.
Introduction So docker is a wonderful tool, easily extensible to replicate almost any enviroment across multiple setups, There's alot of buzz words out there about docker and what its capable of, but in this session we are going to review building decentralized architecture using docker and getting functional with it. A typical setup for this play would be seperating two different modules of the same application so that they can communicate seperately, fun fact is that with docker running the show, they could both be connected to the same data source using docker networking. What is Docker Docker is a technology focused on building container based architecture for improving developer's workflow. A container image is a lightweight, stand-alone, executable package of a piece of software that includes everything needed to run it: code, runtime, system tools, system libraries, settings.
Available for both Linux and Windows based apps, containerized software will always run the same, regardless of the environment Setting up Docker and Docker Compose Docker being a widely used tool has a lot resource related with getting started, without much ado, I'd highlight a few resource that can help you get started asap ( with respect to this post, its assumed that you are already some bit familiar with docker and how it works) For the Linux developers in the house apart from the docs from docker's site, this resources ensure debian based users get the gist easy and quickly. For Linux users (Debian guys in particular (ubuntu, debian, kali, etc)).
For Windows Users, we know you guys use installations files a lot, so the docker docs provide good leverage. For Mac users, The documentation also did justice to this and here you go After installing docker you'll need docker compose, Docker for Mac and Docker for Windows already have this installed, so you are good to go, for the linux users in the house we have work to do. Run this command to download the latest version of docker compose. $ docker-compose -version $ docker-compose version 1.17.0, build 1719ceb Architecture of A Container Containers are not as complex as they sound, turns out they are pretty simple concept and so is their architecture, a docker container is simply a service running on a setup Your containers run on the docker architecture using the configuration in the dockerFile, the docker-compose.yml file or the image specified in the docker run command to setup your containers. These containers usually have exposed ports if they are to connect to each other. Your containers are services on their own and can work off each other using resources from the other via the network setup in them, these networks are created the docker-compose file Your docker file setup typically sets you up with an image, a profile based off which the container is created, To fully explain this we'll dockerize a node application. Dockerizing a node app For this simple set up we are going to set up docker on a web app, node based to show the cool nature of docker.
Code of the project can be found in the reference repository. So first we set up the express application. $ docker run -rm -it -p bindport:exposedport:latest With a container is launched and set. Connecting Containers To connect our container with another container we can set this up using docker compose, fun part is we can run multiple containers and decentralized parts of the same application.
Document Network On Docker For Machine
To accomplish this we'll setup a docker-compose file and build the container from it, as a service, using the docker-compose setup we can set up multiple containers as services and link them via the container's name Here's a sample docker-compose.yml file. Version: '3' services: application: image: mozartted/base-node:latest ports: - '4000:4500' links: - mongo mongo: image: mongo:latest ports: - '7' volumes: -./data:/data/db Using the links tag we connected the application container or service to the mongo service, and with the volume tag we setup a directory data in our project folder as the data volume of the mongo container, using the link in the application's configurations we can connect to the mongo service using the name mongo as the service's address and the exposed port 27017 as the port in the container. But this method of connecting containers limits us to a project set therefore we cant connect containers across two different project, Using the network tags we can set up a network that we can use across different containers and project bases. Version: '3' services: appplication: image: mozartted/base-node:latest ports: - '4000:4500' links: - mongo networks: - backend mongo: image: mongo:latest ports: - '7' volumes: -./data:/data/db networks: - backend networks: backend: driver: 'bridge' With this setup the containers are connected to the backend network therefore external containers can also connect with the backend network to be able access the services in it. To get a list of the networks connected to the container simply run the command.