# pull image
- `docker pull image_name`
# Dockerfile
## ubuntu

FROM ubuntu:latest

# Set the working directory to the user's home directory
WORKDIR /home/huang

# Install necessary packages
RUN apt-get update && apt-get upgrade && apt-get install -y vim git g++ cmake


# Add a user name huang
RUN useradd huang

# Set a password for the user (replace 'password' with your desired password)
#RUN echo 'myuser:password' | password

# add a user to sudoer
USER huang


# Set the entry point for your application, if needed
# ENTRYPOINT ["/path/to/your/application"]

# Optionally, set other environment variables or instructions as needed

# build your own image
- go to the path where Dockerfile is
- `docker build -t <user_defined_image_name> .`
- ex. `docker build -t my_image .`
# create container
- `docker create -it --name <user_defined_container_name> image_name`
- ex. `docker create -it --name my_container my_image`
# start container
- `docker start <user_defined_container_name`
- ex. docker start my_container
# Go inside container
## as a normal user
- `docker exec -it <container_name> bash`
## as a root user
- `docker exec -it -u 0 <container_name> bash`

# Build new image based on previous container
- Use case
- ex. export a port from it
## commit the container
- The following will create a new image based on specific container
`docker commit your-container-id your-new-image-name`
## Add new arguments to it (export a port)
`docker run -p host_port:container_port [-p <host-port-2>:<container-port-2>] --name new_container_name your-new-image-name`