1. nvm install [node 版本號] - 安裝特定版本的 nvm
2. nvm list - 列出已安裝清單
3. nvm use [node 版本號]

1. where does luarocks install --tree /opt/lua_modules lua-resty-jwt 0.2.0-0 install files to ? -------/opt/lua_modules/share/lua/5.1
2. how to generatee a docker image with docker file, how does dockerfile work?

Docker commands
docker-compose up -d                       //run the bat of docker
docker build -t [image的名字] . 
//根据当前目录下的docker file，制作一个docker image，注意-t 后面跟的不是tag而是image的名字
还可以用-f 来指定docker文件的位置，一般就用 .(点）来表示当前目录比较方便，不易错。
docker exec -it b52d8c8b94d4 /bin/bash     //go into docker
docker run -d -p 80:80 --name docker-tutorial docker101tutorial
docker tag [who] [what]：比如：
docker push casproteus/docker101tutorial
docker images = docker image list = docker image ls //list all docker image
docker ps = docker container list   //list running docker container
docker network list
docker network inspect [network name]
docker run -dit --name my_proj6 --network bridge [networkid]
docker attach [container name]
docker stop [container name]
docker container prune
docker image prune -a
docker rm image mysql/mysql-server