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十八、Docker commit 更新镜像

有时候从远程拉取的镜像并不能百分百满足我们的需求，比如我们想使用 Python 3.6.5 运行 Flask 程序

可能，我们翻遍 Docker Hub 也找不到既装了 Python 3.6.5 又装了 Flask 的镜像

那还有其它方法吗？

有的，那就是我们从 python:3.6.5 这个官方镜像开始，装好 Flask，然后再保存为一个新的镜像

拉取 Python 3.6.5 官方镜像​

我们先从远程拉取一个 python:3.6.5 的镜像

[root@pottercoding.cn ~]# docker pull python:3.6.5
3、6.5: Pulling from library/python
cc1a78bfd46b: Pull complete 
6861473222a6: Pull complete 
7e0b9c3b5ae0: Pull complete 
3ec98735f56f: Pull complete 
9b311b87a021: Pull complete 
048165938570: Pull complete 
1ca3d78efb22: Pull complete 
0f6c8999c3b7: Pull complete 
5a85410f5000: Pull complete 
Digest: sha256:b1d2ddc6ab464da30ef5b0ea415c716e3652bd9ebfdd70e7bb56925950a63e98
Status: Downloaded newer image for python:3.6.5

以交互式运行 python:3.6.5 镜像创建一个容器​

先使用docker run 以交互式运行 python:3.6.5 镜像

[root@pottercoding.cn ]# docker run --name python_365_flask -it python:3.6.5 /bin/bash
root@455bba3c41d4:/#

安装最新版 flask​

在交互式容器里运行 pip install flask 安装 flask

root@455bba3c41d4:/# pip install flask
Collecting flask
  Downloading https://files.pythonhosted.org/packages/7f/e7/08578774ed4536d3242b14dacb4696386634607af824ea997202cd0edb4b/Flask-1.0.2-py2.py3-none-any.whl (91kB)
    100% |████████████████████████████████| 92kB 51kB/s 
Collecting itsdangerous>=0.24 (from flask)
  Downloading https://files.pythonhosted.org/packages/dc/b4/a60bcdba945c00f6d608d8975131ab3f25b22f2bcfe1dab221165194b2d4/itsdangerous-0.24.tar.gz (46kB)
    100% |████████████████████████████████| 51kB 70kB/s 
Collecting Werkzeug>=0.14 (from flask)
  Downloading https://files.pythonhosted.org/packages/20/c4/12e3e56473e52375aa29c4764e70d1b8f3efa6682bef8d0aae04fe335243/Werkzeug-0.14.1-py2.py3-none-any.whl (322kB)
    100% |████████████████████████████████| 327kB 72kB/s 
Collecting click>=5.1 (from flask)
  Downloading https://files.pythonhosted.org/packages/34/c1/8806f99713ddb993c5366c362b2f908f18269f8d792aff1abfd700775a77/click-6.7-py2.py3-none-any.whl (71kB)
    100% |████████████████████████████████| 71kB 83kB/s 
Collecting Jinja2>=2.10 (from flask)
  Downloading https://files.pythonhosted.org/packages/7f/ff/ae64bacdfc95f27a016a7bed8e8686763ba4d277a78ca76f32659220a731/Jinja2-2.10-py2.py3-none-any.whl (126kB)
    100% |████████████████████████████████| 133kB 139kB/s 
Collecting MarkupSafe>=0.23 (from Jinja2>=2.10->flask)
  Downloading https://files.pythonhosted.org/packages/4d/de/32d741db316d8fdb7680822dd37001ef7a448255de9699ab4bfcbdf4172b/MarkupSafe-1.0.tar.gz
Building wheels for collected packages: itsdangerous, MarkupSafe
  Running setup.py bdist_wheel for itsdangerous ... done
  Stored in directory: /root/.cache/pip/wheels/2c/4a/61/5599631c1554768c6290b08c02c72d7317910374ca602ff1e5
  Running setup.py bdist_wheel for MarkupSafe ... done
  Stored in directory: /root/.cache/pip/wheels/33/56/20/ebe49a5c612fffe1c5a632146b16596f9e64676768661e4e46
Successfully built itsdangerous MarkupSafe
Installing collected packages: itsdangerous, Werkzeug, click, MarkupSafe, Jinja2, flask
Successfully installed Jinja2-2.10 MarkupSafe-1.0 Werkzeug-0.14.1 click-6.7 flask-1.0.2 itsdangerous-0.24