构建django的docker镜像

构建大致步骤

采用centos镜像作为地板镜像，然后安装python3、pip3，再安装django即可。

但是在构建的过程中也出现了不少问题。

• 问题一：在Django 2.2中启动开发服务器时处理SQLite3错误
• 问题二：Django配置runserver实现远程访问

解决的方式已经详细写在了上面两个链接答案中。

构建镜像的文件目录

[root@server01 django]# tree
.
├── Dockerfile   # 镜像构建Dockerfile
├── restart_service.sh  # 服务启动脚本
├── run_DockerFile.sh  # 镜像构建脚本
└── work   # django项目
    ├── db.sqlite3
    ├── manage.py
    ├── polls
...

Dockerfile

[root@server01 django]# cat Dockerfile 
# Using Centos for base image
FROM centos:latest
# author lijw
MAINTAINER lijw
# start run
    # step1: install python3 pip3
RUN yum install -y wget && \
    cd /opt && \
    wget "https://www.python.org/ftp/python/3.7.1/Python-3.7.1.tgz" && \
    yum install libffi-devel zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make -y && \
    cd /opt && \
    tar -zxvf Python-3.7.1.tgz && \
    cd /opt/Python-3.7.1 && \
    ./configure --prefix=/usr/local/python3 && \
    make && make install && \
    ln -s /usr/local/python3/bin/python3 /usr/bin/python3 && \
    ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3 && \
    pip3 install --upgrade pip && \
    pip3 install ipython && \
    ln -s /usr/local/python3/bin/ipython3 /usr/bin/ipython3 && \
    # step2: install Django
    pip3 install Django && \
    # step3: install sqlite3
    cd ~ && \
    wget https://www.sqlite.org/2019/sqlite-autoconf-3270200.tar.gz && \
    tar -zxvf sqlite-autoconf-3270200.tar.gz && \
    cd sqlite-autoconf-3270200 && \
    ./configure --prefix=/usr/local && \
    make && make install && \
    cd ~ && \
    rm -rf sqlite-autoconf-3270200.tar.gz && \
    rm -rf sqlite-autoconf-3270200 && \
    mv /usr/bin/sqlite3  /usr/bin/sqlite3_old && \
    ln -s /usr/local/bin/sqlite3 /usr/bin/sqlite3 && \
    echo 'export LD_LIBRARY_PATH="/usr/local/lib"' >> /root/.bashrc && \
    source /root/.bashrc && \
    # step4: clear yum
    yum clean all
# Copy Django code to image
COPY work /work
# Start Django Service
CMD export LD_LIBRARY_PATH="/usr/local/lib" && \
    cd /work && python3 manage.py runserver 0.0.0.0:8000
[root@server01 django]# 

编译生成镜像

[root@server01 django]# cat run_DockerFile.sh 
docker build -t django .
[root@server01 django]# 

启动服务脚本

[root@server01 django]# cat restart_service.sh 
docker stop django
docker rm django
docker run --name django --restart always \
       -h djangoServer \
       -d -p 8000:8000 \
       django
[root@server01 django]# 

运行中的docker进程

[root@server01 django]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                                            NAMES
1ef06015ff9b        django              "/bin/sh -c 'expor..."   2 minutes ago       Up 2 minutes        0.0.0.0:8000->8000/tcp                           django
093c3282ed6e        gogs/gogs           "/app/gogs/docker/..."   22 hours ago        Up 22 hours         0.0.0.0:10022->22/tcp, 0.0.0.0:10080->3000/tcp   gogs
[root@server01 django]# 

测试访问

[root@server01 ~]# curl http://172.16.0.4:8000/polls/





    

    



        
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[root@server01 ~]# 

缺点

本次编译镜像安装了比较多的服务，所以镜像尽管采用了串联的方式去编写，清除了不需要的yum缓存以及安装文件，镜像依然较大。

[root@server01 django]# docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
django                latest              1aca5ef73690        9 minutes ago       816 MB
                              a7c9243edeb0        10 minutes ago      816 MB
                              12567dcc7855        12 minutes ago      816 MB
                              a52e87c281be        15 minutes ago      816 MB
                              14a3e40c1302        17 minutes ago      816 MB
                              12c2262cbed5        34 minutes ago      816 MB
                              db9c18fbcbc7        4 hours ago         841 MB
docker.io/gogs/gogs   latest              08fa8ee955da        5 weeks ago         99.1 MB
docker.io/centos      latest              9f38484d220f        7 weeks ago         202 MB

在编译镜像的过程会产生很多none镜像，都应该删除掉。

[root@server01 django]# docker images | grep none | awk '{print $3}' | xargs docker rmi
Deleted: sha256:a7c9243edeb050e337818ea0ac9ece2b33ffc87febba62f033b068a1d2be9121
Deleted: sha256:8ef3d81763b3c50d19891d5a1bda860bbe442021cd0fb4f0ecb3f6e2dae4a74d
Deleted: sha256:df6f1865b5dfaa1950e055de25c88740dc447b571c8dbe25c2d9edf04fbea51f
Deleted: sha256:12567dcc7855d17fa93d22a97ae7091279d8b9fe88f65329c421604e751d5841
Deleted: sha256:b5ba6bf6bae1549c3c0a40745b33946096066c6cb7a64cd6847ae22230ecffeb
Deleted: sha256:1aaa5122053eba7e6ac9f3f9d46cd5068549b809866b8cc2352c33df5a38e66b
Deleted: sha256:a52e87c281be0935093821c1e80e3f12c006ba2ad7ad72e8c745efa7f5e9b18e
Deleted: sha256:d9b5547926368d40749fe641dbe06e25b7c78e0cf4ddb36ae67b87afbdabc07e
Deleted: sha256:4bf3ff836e1f6ef5c5caeb750a62ca61f24737e8c756de4424773feb7d04dc6b
Deleted: sha256:14a3e40c1302dffc4298685647dfb7e91cbf5e33496492dc64de6e67cca9626d
Deleted: sha256:3a5a02f60e80b29e9a096d30fcdf664ae52dfa658461bdf092dfd2d42eb04391
Deleted: sha256:d51b11a568529fb4a720f3b5bd0769c266db5af7b363f24d01064f35150cca1c
Deleted: sha256:12c2262cbed51e3cc46b19472f63570a9e9cbf748e56d4581f83e11388e141c9
Deleted: sha256:31b5244e8ce7d1109815023e11641ed09b9171f5611068d83775747570fb36c4
Deleted: sha256:916305e485efd3185c9aa8866fbfc27c3953490f11b7d8d2756d2cb9d5f433e5
Deleted: sha256:db9c18fbcbc71f4a9526a68585c35be31f65730b891955f0b08abc376fe4a89e
Deleted: sha256:bd24b4c744ed1fa90f5b2896c8b6c96c714fb3ba19693f139bb5bb65030f12ce
[root@server01 django]# 
[root@server01 django]# docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
django                latest              1aca5ef73690        11 minutes ago      816 MB
docker.io/gogs/gogs   latest              08fa8ee955da        5 weeks ago         99.1 MB
docker.io/centos      latest              9f38484d220f        7 weeks ago         202 MB
[root@server01 django]#