How to use docker on ecs (tutorial)

With the development of cloud computing technology, cloud servers (ECS) have become an indispensable part of Internet enterprise operation and maintenance. As a fast and convenient containerization technology, Docker has gradually become a popular choice for enterprise development and operation and maintenance. This article will introduce how to use Docker on Alibaba Cloud ECS.

1. Purchase ECS

First, you need to purchase an ECS instance in the Alibaba Cloud console. You need to select an operating system when purchasing. It is recommended to choose the CentOS 7.X version here because Docker has better support for CentOS 7.X. After successful purchase, you need to log in to the ECS instance.

2. Install Docker

1. Update the yum package manager
   In CentOS, you can use the yum package manager to install Docker. First, you need to update the yum package manager:

sudo yum update

2. Install Docker
   Execute the following command to install Docker:

sudo yum install docker

3. Start Docker
   After the installation is successful, execute the following command to start Docker:

sudo service docker start

4. Set Docker to start automatically
   If you want to automatically start Docker when starting an ECS instance, you can execute the following command:

sudo chkconfig docker on

3. Docker commonly used Command

1. Search image
   You can use Docker Hub to search for official images, for example, search for Tomcat images:

sudo docker search tomcat

2. Download image
   Use the following command to download Tomcat 9 image:

sudo docker pull tomcat:9.0

3. View downloaded images
   Execute the following command to view all downloaded images:

sudo docker images

4. Start the container
   Use the following command to start the Tomcat 9 container, where the -p parameter maps the 8080 port to the 8080 port of the ECS instance:

sudo docker run -d -p 8080:8080 --name tomcat9 tomcat:9.0

5. View the container running status
   Execute the following command to view the running status of the container:

sudo docker ps

6. Stop the container
   Use the following command to stop the container:

sudo docker stop 容器ID或容器名

7. Delete container
   Use the following command to delete the container:

sudo docker rm 容器ID或容器名

4. Solutions to common problems

1. The error message "Got permission denied while trying to connect to the Docker daemon socket..."
   This error is usually because the current user cannot access the Docker engine. You can use the following command to solve it:

sudo usermod -aG docker 用户名

2. Failed to use the ping command in the Docker container
   This error is usually because The ping command is missing in the Docker container. You can use the following command to install it:

sudo yum install iputils -y

Summary

It is very convenient to use Docker on Alibaba Cloud ECS. You only need to purchase an ECS instance and install Docker. . By studying this article, you have learned how to use Docker on ECS and learned solutions to some common problems. I hope it will be helpful to your work and study.

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