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Docker 基于Dockerfile创建镜像实践


需求描述

简单说,就是创建一个服务型的镜像,即运行基于该镜像创建的容器时,基于该容器自动开启一个服务。具体来说,是创建一个部署了nginxuwsgipythondjango项目代码的镜像,运行基于该镜像创建的容器时,自动开启nginx,uwsgi等服务。简单理解就是在容器内部,通过nginx+uwsgi部署Django项目

实践环境

CentOS Linux release 7.9.2009

实践过程

实践过程1

Django项目代码组织结构

Docker 基于Dockerfile创建镜像实践

env_setup.sh
#!/bin/bash  yum install -y wget gcc make zlib* openssl-devel sqlite-devel  wget http://nginx.org/download/nginx-1.10.3.tar.gz tar -xvzf nginx-1.10.3.tar.gz cd nginx-1.10.3 ./configure --prefix=/usr/local/nginx make && make install cp -f /opt/DjServer/docker/nginx.conf /usr/local/nginx/conf/nginx.conf chmod 755 /usr/local/nginx/conf/nginx.conf ln -s /usr/local/nginx/sbin/nginx /usr/bin/nginx cd .. && rm -rf nginx-1.10.3*   wget http://www.sqlite.org/2019/sqlite-autoconf-3280000.tar.gz tar -xvzf sqlite-autoconf-3280000.tar.gz cd sqlite-autoconf-3280000 ./configure --prefix=/usr/local/sqlite make && make install mv /usr/bin/sqlite3 /usr/bin/sqlite3_old ln -s /usr/local/sqlite/bin/sqlite3 /usr/bin/sqlite3 echo "/usr/local/sqlite/lib" > /etc/ld.so.conf.d/sqlite3.conf ldconfig cd .. && rm -rf sqlite-autoconf-*  wget https://www.python.org/ftp/python/3.6.13/Python-3.6.13.tgz tar -xvzf Python-3.6.13.tgz cd Python-3.6.13 ./configure --prefix=/usr/local/python36 make && make install cd .. && rm -rf Python-3.6.13* ln -s /usr/local/python36/bin/python3 /usr/bin/python3 ln -s /usr/local/python36/bin/pip3 /usr/bin/pip3 ls pip3 install -r  /opt/DjServer/requirements.txt ln -s /usr/local/python36/bin/uwsgi /usr/bin/uwsgi mkdir -p /var/log/uwsgi 
start.sh
#!/bin/bash `uwsgi --ini uwsgi.ini &` && nginx -c /usr/local/nginx/conf/nginx.conf -g "daemon off;" 
nginx.conf
worker_processes 16;  events {     worker_connections  65535; }   http {     include       mime.types;     default_type  application/octet-stream;      keepalive_timeout  65;     reset_timedout_connection on;       server {         listen       80;         server_name  localhost;          charset utf-8;          #access_log logs/access.log;         access_log off;         error_log logs/error.log;          error_page   500 502 503 504  /50x.html;         location = /50x.html {             root   html;         }          location / {             uwsgi_send_timeout 60;                     uwsgi_connect_timeout 60;                 uwsgi_read_timeout 600;              include uwsgi_params;             uwsgi_pass 127.0.0.1:8000;         }     } } 
requirements.txt
Django==3.0.6 uwsgi==2.0.8 

前置准备工作

如下,创建一个干净的目录(例中为myworkspace),用于创建镜像,并将解压后的Django项目代码存放到该目录,然后在该目录下新建并编写dockerfile.dockerignore文件。

# pwd /root/myworkspace # ls -a .  ..  DjServer  dockerfile  .dockerignore 
dockerfile
FROM centos:7.9.2009  WORKDIR /opt/DjServer COPY ./DjServer . RUN chmod 755 ./docker/env_setup.sh      && sh ./docker/env_setup.sh      && chmod 755 ./docker/start.sh EXPOSE 80 ENTRYPOINT ["./docker/start.sh"] 
.dockerignore
*/__pycache__ 

创建服务镜像

如下,创建djserver:v1.0镜像

# docker build  -t djserver:v1.0 . ...略 Successfully tagged djserver:v1.0 

创建容器

基于上述镜像创建名为dj80的容器,映射宿主主机80端口到容器的80端口,并为容器设置环境变量

# docker run --name dj9003 -p 9003:80 -e hostPort=10.1.66.163:9003 -d -it djserver:v1.0 

测试验证

# curl http://10.7.0.236:9003/loadapi/api/v1/ip_forward # 10.7.0.236为容器所在宿主机 

实践过程2

Django项目代码组织结构

Docker 基于Dockerfile创建镜像实践

注意:代码结构中的requirements.txt暂时没用到,对该文件的定位是,存放创建基础镜像时新增requirements.txt文件所包含依赖包除外的其它依赖包。

创建基础镜像前置准备工作

如下,创建一个干净的目录(例中为env_build),用于创建提供软件运行环境的基础镜像,并在该目录下新建并编写dockerfile,新建env_conf目录,然后在env_conf目录下新建env_setup.sh, requirements.txt

# pwd /root/env_build # ls -aR .: .  ..  env_conf  env_dockerfile  ./env_conf: .  ..  env_setup.sh  requirements.txt 
env_dockerfile
FROM centos:7.9.2009 COPY ./env_conf . RUN chmod 755 env_setup.sh      && sh env_setup.sh      && rm -f env_setup.sh requirements.txt 
env_setup.sh
#!/bin/bash  yum install -y wget gcc make zlib* openssl-devel sqlite-devel  wget http://nginx.org/download/nginx-1.10.3.tar.gz tar -xvzf nginx-1.10.3.tar.gz cd nginx-1.10.3 ./configure --prefix=/usr/local/nginx make && make install cd .. && rm -rf nginx-1.10.3* ln -s /usr/local/nginx/sbin/nginx /usr/bin/nginx   wget http://www.sqlite.org/2019/sqlite-autoconf-3280000.tar.gz tar -xvzf sqlite-autoconf-3280000.tar.gz cd sqlite-autoconf-3280000 ./configure --prefix=/usr/local/sqlite make && make install mv /usr/bin/sqlite3 /usr/bin/sqlite3_old ln -s /usr/local/sqlite/bin/sqlite3 /usr/bin/sqlite3 echo "/usr/local/sqlite/lib" > /etc/ld.so.conf.d/sqlite3.conf ldconfig cd .. && rm -rf sqlite-autoconf-*  wget https://www.python.org/ftp/python/3.6.13/Python-3.6.13.tgz tar -xvzf Python-3.6.13.tgz cd Python-3.6.13 ./configure --prefix=/usr/local/python36 make && make install cd .. && rm -rf Python-3.6.13* ln -s /usr/local/python36/bin/python3 /usr/bin/python3 ln -s /usr/local/python36/bin/pip3 /usr/bin/pip3  pip3 install -r requirements.txt ln -s /usr/local/python36/bin/uwsgi /usr/bin/uwsgi mkdir -p /var/log/uwsgi 
requirements.txt
Django==3.0.6 uwsgi==2.0.8 

注意:这里对requirements.txt的定位是,用于存放一定需要安装,并且极少改动(比如更换版本)的软件依赖包

创建基础镜像

如下,创建djbase:v1.0基础镜像,为运行Django项目提供所需的软件运行环境

# docker build --no-cache -t djbase:v1.0 -f env_dockerfile . ...略docker build --no-cache -t djbase:v1.0 -f env_dockerfile . Successfully tagged djbase:v1.0 

创建服务镜像前置准备工作

创建一个干净的目录(例中为server_build),用于创建最终服务镜像,并将解压后的Django项目代码存放到该目录,然后在该目录下新建并编写dockerfile.dockerignore 文件。

# pwd /root/server_build # ls -a .  ..  DjServer  dockerfile  .dockerignore 
dockerfile
FROM djbase:v1.0  WORKDIR /opt/DjServer RUN mkdir -p /var/log/uwsgi COPY ./DjServer/docker/nginx.conf . RUN mv -f ./nginx.conf /usr/local/nginx/conf/nginx.conf && chmod 755 /usr/local/nginx/conf/nginx.conf COPY ./DjServer . RUN chmod 755 ./docker/start.sh EXPOSE 80 ENTRYPOINT ["./docker/start.sh"] 
.dockerignore
*/__pycache__ 
docker/start.sh
#!/bin/bash `uwsgi --ini uwsgi.ini &` && nginx -c /usr/local/nginx/conf/nginx.conf -g "daemon off;" 
docker/nginx.conf

“实践过程1”

创建服务镜像

如下,创建djserver:v1.0服务镜像

# docker build -t djserver:v1.0 . ...略 Successfully tagged djserver:v1.0 

创建容器

基于上述镜像创建名为djserver的容器,映射宿主主机80端口到容器的80端口

# docker run --name dj9003 -p 9003:80 -e hostPort=10.1.66.163:9003 -d -it djserver:v1.0 
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