Docker mongodb how to#
Docker mongodb manual#
Docker mongodb full#
Docker mongodb software#

There are other tools to synchronize the execution of the various containers. Since the configuration command must be executed when at least one MongoDB instance is ready, we will use the wait-for-it script. It will also copy inside the container the file with MongoDB shell commands for configuring the replica set (called mongo-setup.js) and a bash script (mongo-setup.sh) to forward the commands to a mongo instance. The Dockerfile will rely on the mongo image to have the client with which to connect to the other instances of the replica set. So we create a folder called mongo-setup and inside it we define a Docker file. How is it possible to automate this aspect as well? Let’s see it together!įirst we need to create a new service that will have the task of configuring the replica set. In fact, every time the project will have to be installed on a machine we will have to repeat it introducing possible errors.

Docker mongodb manual#

This manual procedure, which must be done when creating the services, reduces the advantages of having a Docker-based architecture.

However, in the example shown, it was necessary to connect to a MongoDB instance and execute the commands to initialize the replica set. 'replicaSetId' : ObjectId('60180880996f5407158e79e8')Īs we saw earlier, it is possible to create a MongoDB replica set using Docker Compose. 'writeConcernMajorityJournalDefault' : true, To initialize the replica set you only need to pass this variable to the rs.initiate() command as shown below. In fact, having given higher priority to the mongodb1 node, we are sure that unless there are problems with that service, it will always be elected as primary. Although it is not necessary, this information will allow us to influence the election of the primary. We have also inserted a priority property for each member of the replica set.

It will be the Docker’s task to route the traffic appropriately. This is because it is not possible a priori to know the IP address assigned to each container. For the host, being inside a Docker service, we use the name of the container followed by the port on which the service is listening. Each node, represented by an embedded document, will be characterized by an _id equal to a number and by the host. Inside this folder we create a file called docker-compose.yml that will have the following content.Īs you can see the _id of the document is the name of the replica set, rsmongo, while the members vector contains the description of each node that will belong to the replica set. Let’s go ahead and create a folder for our tutorial that we will call mongo_example. MongoDB instances will, in fact, be created within Docker. It is not necessary to have MongoDB installed.

Docker mongodb how to#

You can find all the information on how to install and properly configure your PC in the article Introduction to Docker. In particular, you must have both Docker and Docker Compose installed on your machine.

Docker mongodb software#

Workspace configurationīefore starting, you should verify that you have all the necessary software installed. In this article we’ll look at how you can create a MongoDB installation configured in replica set by leveraging Docker Compose. Moreover, if there is a failure or even a blackout of the servers, the automatic restart of the databases may reserve some unpleasant surprises.Īs we saw in the Introduction to Docker and Docker compose – how to orchestrate different containers articles, using Docker and Docker Compose allows us to create a highly reliable virtual environment for both development and production.

Docker mongodb full#

When it comes to configuring a MongoDB replica set, the job can be even harder and full of pitfalls. Finding the right configuration so that other services are not compromised and at the same time ensuring a high level of efficiency and security is not always an easy task. Installing and configuring a database often takes hours of work.