Probamos la instalación de docker sea correcta
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker run hello-world Unable to find image 'hello-world:latest' locally latest: Pulling from library/hello-world 1b930d010525: Pull complete Digest: sha256:41a65640635299bab090f783209c1e3a3f11934cf7756b09cb2f1e02147c6ed8 Status: Downloaded newer image for hello-world:latest Hello from Docker! This message shows that your installation appears to be working correctly. To generate this message, Docker took the following steps: 1. The Docker client contacted the Docker daemon. 2. The Docker daemon pulled the "hello-world" image from the Docker Hub. (amd64) 3. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. 4. The Docker daemon streamed that output to the Docker client, which sent it to your terminal. To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID: https://hub.docker.com/ For more examples and ideas, visit: https://docs.docker.com/get-started/El projecto que se va a subir al contenedor consta de tres archivos
Dockerfile: que describe la construcción de la imagen docker.
app.py: que es la aplicación html, que usa phyton, con Flask como
Framework, y redis para base de datos.
requirements.txt: contiene los paquetes que instalara para python con pip.
En la vista se puede observar una panoramica del projecto python.
Probamos la aplicación python en máquina local.
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ python app.py * Serving Flask app "app" (lazy loading) * Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Debug mode: off * Running on http://0.0.0.0:4000/ (Press CTRL+C to quit)
Desde el browser veremos que el nombre del localhost corresponde al de la máquina local, y se incrementa el número de visitas.
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ python app.py * Serving Flask app "app" (lazy loading) * Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Debug mode: off * Running on http://0.0.0.0:4000/ (Press CTRL+C to quit) 127.0.0.1 - - [21/Jun/2019 20:10:38] "GET / HTTP/1.1" 200 - 127.0.0.1 - - [21/Jun/2019 20:11:28] "GET / HTTP/1.1" 200 -
Construimos la imagen docker.
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker build --tag=python_app . Sending build context to Docker daemon 20.48kB Step 1/7 : FROM python:2.7-slim 2.7-slim: Pulling from library/python fc7181108d40: Pull complete 8c60b810a35a: Pull complete d207b275197c: Pull complete 63184f224d60: Pull complete Digest: sha256:1405fa2f8e9a232e2f60cafbb2b06ca2f1e0f577f4b4c397c361d6dba59fd24e Status: Downloaded newer image for python:2.7-slim ---> ca96bab3e2aa Step 2/7 : WORKDIR /app ---> Running in aeab2488bb81 Removing intermediate container aeab2488bb81 ---> a0af2215bb76 Step 3/7 : COPY . /app ---> 65c2721d2558 Step 4/7 : RUN pip install --trusted-host pypi.python.org -r requirements.txt ---> Running in d9055f7d946e DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. Collecting flask (from -r requirements.txt (line 1)) Downloading https://files.pythonhosted.org/packages/9a/74/670ae9737d14114753b8c8fdf2e8bd212a05d3b361ab15b44937dfd40985/Flask-1.0.3-py2.py3-none-any.whl (92kB) Collecting redis (from -r requirements.txt (line 2)) Downloading https://files.pythonhosted.org/packages/ac/a7/cff10cc5f1180834a3ed564d148fb4329c989cbb1f2e196fc9a10fa07072/redis-3.2.1-py2.py3-none-any.whl (65kB) Collecting itsdangerous>=0.24 (from flask->-r requirements.txt (line 1)) Downloading https://files.pythonhosted.org/packages/76/ae/44b03b253d6fade317f32c24d100b3b35c2239807046a4c953c7b89fa49e/itsdangerous-1.1.0-py2.py3-none-any.whl Collecting Jinja2>=2.10 (from flask->-r requirements.txt (line 1)) Downloading https://files.pythonhosted.org/packages/1d/e7/fd8b501e7a6dfe492a433deb7b9d833d39ca74916fa8bc63dd1a4947a671/Jinja2-2.10.1-py2.py3-none-any.whl (124kB) Collecting Werkzeug>=0.14 (from flask->-r requirements.txt (line 1)) Downloading https://files.pythonhosted.org/packages/9f/57/92a497e38161ce40606c27a86759c6b92dd34fcdb33f64171ec559257c02/Werkzeug-0.15.4-py2.py3-none-any.whl (327kB) Collecting click>=5.1 (from flask->-r requirements.txt (line 1)) Downloading https://files.pythonhosted.org/packages/fa/37/45185cb5abbc30d7257104c434fe0b07e5a195a6847506c074527aa599ec/Click-7.0-py2.py3-none-any.whl (81kB) Collecting MarkupSafe>=0.23 (from Jinja2>=2.10->flask->-r requirements.txt (line 1)) Downloading https://files.pythonhosted.org/packages/fb/40/f3adb7cf24a8012813c5edb20329eb22d5d8e2a0ecf73d21d6b85865da11/MarkupSafe-1.1.1-cp27-cp27mu-manylinux1_x86_64.whl Installing collected packages: itsdangerous, MarkupSafe, Jinja2, Werkzeug, click, flask, redis Successfully installed Jinja2-2.10.1 MarkupSafe-1.1.1 Werkzeug-0.15.4 click-7.0 flask-1.0.3 itsdangerous-1.1.0 redis-3.2.1 Removing intermediate container d9055f7d946e ---> 09637f2e02fc Step 5/7 : EXPOSE 4000 ---> Running in 427e82fd31d8 Removing intermediate container 427e82fd31d8 ---> d94ae6b2d53d Step 6/7 : ENV NAME Mundito (env var definido en Dockerfile) ---> Running in ef1030ab55c9 Removing intermediate container ef1030ab55c9 ---> c11af545add6 Step 7/7 : CMD ["python","app.py"] ---> Running in 8f2d4143b72a Removing intermediate container 8f2d4143b72a ---> 68e8339a3346 Successfully built 68e8339a3346 Successfully tagged python_app:latest bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$
Checamos las imagenes docker
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE python_app latest 68e8339a3346 4 minutes ago 131MB python 2.7-slim ca96bab3e2aa 10 days ago 120MB hello-world latest fce289e99eb9 5 months ago 1.84kB
Corremos la imagen docker reasignando el puerto 4000 original de la aplicación python a el puerto 5000 que consumirá desde la máquina local
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker run -p 5000:4000 python_app * Serving Flask app "app" (lazy loading) * Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Debug mode: off * Running on http://0.0.0.0:4000/ (Press CTRL+C to quit) 172.17.0.1 - - [22/Jun/2019 01:20:06] "GET / HTTP/1.1" 200 -
Desde otra terminal podemos ver el proceso corriendo del contenedor
bext@bext-VPCF13WFX:~$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 249d886cd6b9 python_app "python app.py" About a minute ago Up About a minute 0.0.0.0:5000->4000/tcp unruffled_brattain
bext@bext-VPCF13WFX:~$ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 249d886cd6b9 python_app "python app.py" 9 minutes ago Up 9 minutes 0.0.0.0:5000->4000/tcp unruffled_brattain 9e71a2aaba38 hello-world "/hello" About an hour ago Exited (0) About an hour ago wizardly_swartz
Alternativamente podemos ver el los procesos con la herramienta ctop
Ahora detendremos los contenedores y los borraremos.
bext@bext-VPCF13WFX:~$ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES cd9e83defb99 python_app "python app.py" 5 minutes ago Exited (0) About a minute ago cocky_shirley 249d886cd6b9 python_app "python app.py" 17 minutes ago Exited (0) 7 minutes ago unruffled_brattain 9e71a2aaba38 hello-world "/hello" About an hour ago Exited (0) About an hour ago wizardly_swartz bext@bext-VPCF13WFX:~$ docker stop $(docker ps -aq) cd9e83defb99 249d886cd6b9 9e71a2aaba38 bext@bext-VPCF13WFX:~$ docker rm $(docker ps -aq) cd9e83defb99 249d886cd6b9 9e71a2aaba38 bext@bext-VPCF13WFX:~$ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES bext@bext-VPCF13WFX:~$
Ahora compartiremos la imagen por medio del repositorio de docker
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE python_app latest 68e8339a3346 About an hour ago 131MB python 2.7-slim ca96bab3e2aa 11 days ago 120MB hello-world latest fce289e99eb9 5 months ago 1.84kB bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$
Accedemos al repositorio docker
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker login Authenticating with existing credentials... WARNING! Your password will be stored unencrypted in /home/bext/.docker/config.json. Configure a credential helper to remove this warning. See https://docs.docker.com/engine/reference/commandline/login/#credentials-store Login Succeeded bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$
Etiquetamos la imagen que subiremos al repositorio, previamente ya debimos rear el repositorio donde subiremos la imagen python_app
Etiquetamos la imagen
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker tag python_app jalbertomr/lab1:python_app_1 bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE jalbertomr/lab1 python_app_1 68e8339a3346 About an hour ago 131MB python_app latest 68e8339a3346 About an hour ago 131MB python 2.7-slim ca96bab3e2aa 11 days ago 120MB hello-world latest fce289e99eb9 5 months ago 1.84kB
La subimos
bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$ docker push jalbertomr/lab1:python_app_1 The push refers to repository [docker.io/jalbertomr/lab1] fcce160d5a7c: Pushed d3b05a658449: Pushed c2a45b91534b: Pushed a212ef9c5ee1: Pushed a47fa5565167: Mounted from library/python 658556256f47: Mounted from library/python cf5b3c6798f7: Mounted from library/python python_app_1: digest: sha256:ce8c79d3c0bedbbf7b4c890581481ab90440fbd9005bf47da04059a21149d553 size: 1789 bext@bext-VPCF13WFX:~/DockerAppConfig/DockerSampleApp$
Verificamos en el repositorio de docker
OK.
https://github.com/jalbertomr/DockerSampleApp.git
eot
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