check disk usage
df -h
check docker system usage
docker system df -v
clean
docker container prune; docker image prune; docker volume prune
docker builder prune -a
docker rmi $(docker images -q)
docker rm -v $(docker ps -qa)
Unicode is a character set. UTF-8 is encoding.
Unicode is a list of characters with unique decimal numbers (code points). A = 65, B = 66, C = 67, ....
This list of decimal numbers represent the string “hello”: 104 101 108 108 111
Encoding is how these numbers are translated into binary numbers to be stored in a computer:
UTF-8 encoding will store “hello” like this (binary): 01101000 01100101 01101100 01101100 01101111
1. 在 Dockerfile 中启用
FROM ubuntu:latest
RUN apt update && apt install openssh-server sudo -y
RUN service ssh start
EXPOSE 22
CMD ["/usr/sbin/sshd","-D"]
2. 在容器启动之后启用
apt-get update && apt-get install openssh-server
service ssh start
