what is docker-compose

docker-compose is an open source project based on docker. It is hosted on github and implemented by python. It calls the API of the docker service to implement the rapid orchestration of the docker container cluster, which is defined through a separate yaml file. A set of related containers to serve a project.

The operating environment of this article: ubuntu 18.04 system, docker-compose version 1.24.1, Dell G3 computer.

What is docker-compose?

docker-compose is an open source project based on docker, hosted on github, implemented by python, and is responsible for calling the API of the docker service. The rapid orchestration of docker container clusters uses a single yaml file to define a set of related containers to serve a project.

So, the default management object of docker-compose is the project, and the life cycle management of a group of containers in the project is carried out through subcommands.

Installation of docker-compose:

Two ways to install docker-compose. The first way is relatively simple, but due to network problems, it often cannot be installed. And it often disconnects. The second method is slightly troublesome, but the installation process is relatively stable.

1. Download and install directly from github:

curl -L https://github.com/docker/compose/releases/download/1.24.1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose 
chmod +x /usr/local/bin/docker-compose
docker-compose --version

Check the version after successful installation, but it often fails due to network problems

2. Install through python-pip:

Using pip to install docker-compose relies on the python3 environment, and the default Python version of the centos7 system is 2.7.5, so more dependencies need to be installed. The process is as follows:

yum -y install epel-release python-pip gcc python-devel -y  （执行两次）
pip -V
pip install --upgrade pip
pip install six --user -U
pip install docker-compose
docker-compose version

The above I have tested the process many times. When upgrading pip and install six --user-U, a timeout error was reported. I turned on the hotspot on my mobile phone and changed the network, and there was no problem.

pip install ipython -- user -U If the network is not a problem and an error is still reported, you can try this

as above. If the network is not good, an error will be reported.

3. A simpler solution:

When installing the pip tool, directly choose to install the pip3 version. Using pip3 to install docker-compose does not require the installation of additional dependencies. The process is as follows :

yum -y install epel-release python3-pip gcc python-devel -y  （执行两次）
pip3 install docker-compose
docker-compose version

The above problem will not occur on the Ubuntu18.04 system, because the default Python environment of Ubuntu18.04 is 3.6.8.

Recommended learning: "docker video tutorial"

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