映象的建立和儲存

• 基於現有父映象開發並commit
• 使用Dockerfile檔案建立

一.基於現有父映象開發並commit

1. pull and start a new container

docker pull ubuntu:18.04
docker run -it ubuntu:18.04 bash

2. deploy app and edit /run.sh

3. exit and commit this container

// docker commit ID SW_NAME:VERSION
// example:
root@13336c183077:/# exit
exit
bear@k40 ~% docker commit 13336c183077 ubuntu.18.04:v1
 

4. run the new container by run.sh

docker run ubuntu.18.04:v1 /run.sh

二.使用Dockerfile檔案建立

1. touch a new Dockerfile and edit:

FROM nginx
RUN echo 'I'm nginx' > /usr/share/nginx/html/index.html

• FROM: IMAGE, base 父映象
• RUN：["可執行檔案", "引數1", "引數2"], like RUN ["./test.php", "dev", "offline"] == RUN ./test.php dev offline
  注意：

FROM centos
RUN yum install wget
RUN wget -O redis.tar.gz "http://download.redis.io/releases/redis-5.0.3.tar.gz"
RUN tar -xvf redis.tar.gz
以上執行會建立 3 層映象。可簡化為以下格式：
FROM centos
RUN yum install wget \
    && wget -O redis.tar.gz "http://download.redis.io/releases/redis-5.0.3.tar.gz" \
    && tar -xvf redis.tar.gz
 

2. build new image

當前目錄.上下文路徑建立映象：

docker build -t myimage:v1 .