How to change the root password in a container using Docker

1. Use the following command to set the ssh password when making dockerfile

RUN echo "root:root" | chpasswd

2. Now you need to change the root password in the container after the container is generated

The docker exec -it centos7.5 root:newpassword | chpasswd command was executed successfully, but the password update failed.

The correct way is as follows:

PASS='newpassword ' && echo -e "KaTeX parse error: Expected 'EOF', got '\n' at position 5: PASS\̲n̲PASS" | docker exec -i centos7.5

Supplement: What is the password after docker pull centos? 【Xiaobaitiankeng】

For the record, the first time I used Baota's docker to pull centos8, when I started the centos8 container, I was prompted to enter a password. I was confused at the time. What was the password? After an hour of work, I finally figured out how to do it. I just ssh to my server and then run

docker exec -it your container name/bin/bash

This will take you directly into the new container. So where is the name of your container? See the picture below

So, I directly execute

docker exec -it funny_tesla /bin/bash

You can enter the centos8 container and do whatever you want. . End~

The above is my personal experience. I hope it can give you a reference. I also hope that you will support 123WORDPRESS.COM. If there are any mistakes or incomplete considerations, please feel free to correct me.