How to solve the problem that ubuntu docker cannot start

In the process of using Docker, sometimes we will encounter some problems. For example, when using Docker under the Ubuntu system, we may encounter the problem of being unable to start. This article explains how to resolve this issue.

1. Check if Docker is running

First, we need to check if Docker is running. We can enter the following command in the terminal:

sudo service docker status

If the output shows that Docker is running, Docker is not the reason why it cannot be started. If it is not running, we need to start Docker. Enter the following command:

sudo service docker start

Now, Docker should have started, you can check it using the following command:

sudo service docker status

2. View Docker log

If Docker Still unable to start, we can check Docker's logs to understand the cause of the problem. Enter the following command:

sudo journalctl -xe

This will display the system log and highlight error messages. You can check whether there are any error messages related to Docker and find solutions.

3. View Docker configuration

Docker configuration files are usually stored in the /etc/docker directory. We can check if the files in this directory exist or are causing the problem. Enter the following command:

ls /etc/docker/

The above command will display a list containing Docker configuration files. If a file is missing, you will need to reinstall Docker.

4. Reinstall Docker

If none of the above methods solve the problem, you may need to reinstall Docker. You can use the following command to delete it:

sudo apt-get remove docker docker-engine docker.io

Then, you can use the following command to reinstall Docker:

sudo apt-get update
sudo apt-get install docker-ce

The above installation command is applicable to Ubuntu system. Other Linux distributions may require different installation commands.

Summary

It is very common to encounter problems when using Docker. When Docker fails to start, you first need to check whether Docker is running, and then view Docker's logs and configuration. If none of these methods resolve the issue, you may need to reinstall Docker. Hope this article is helpful to you.

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