03 更新应用

更新应用（删除并重建容器）

In this part, you will update the application and container image. You will also learn how to stop and remove a container.

注意：这种方式，删除容器的过程中，容器中文件的创建修改也会丢失。

更新源码

1. 打开src/static/js/app.js文件， 更新第56行

   ...
    -                <p className="text-center">No items yet! Add one above!</p>
    +                <p className="text-center">You have no todo items yet! Add one above!</p>
    ...

2. 重新编译镜像image

   docker build -t getting-started .

3. 此时直接启动会失败

   docker run -d -p 3000:3000 getting-started

   因为原来的容器还在运行。

移除旧容器

移除旧容器之前，需要先停止容器

查看运行中的容器:（会有一串字符串，标识容器id)

docker ps

停止对应的容器：

docker stop <the-container-id>

删除对应的容器：

docker rm <the-container-id>

运行更新过的app容器

1. 使用镜像创建并运行更新过的app

   docker run -d -p 3000:3000 getting-started

2. 在浏览器中刷新http://<your_ip>:3000， 然后可以看到提示信息已经改变

注意

While you were able to build an update, there were two things you might have noticed:

• All of the existing items in your todo list are gone! That’s not a very good app! You’ll fix that shortly.
• There were a lot of steps involved for such a small change. In an upcoming section, you’ll learn how to see code updates without needing to rebuild and start a new container every time you make a change.