deploy

szabgab · Dec 9, 2020 · 275eda2 · 275eda2
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diff --git a/docker/deploy.md b/docker/deploy.md
@@ -0,0 +1,86 @@
+# Deploy
+{id: deploy}
+
+## Digital Ocean
+{id: digital-ocean}
+
+* [Digital Ocean](https://www.digitalocean.com/?refcode=0d4cc75b3a74)
+
+## Stand-alone Application to deploy
+{id: stand-alone-application-to-deploy}
+
+* A stand-alone Docker image that exposes a single port
+
+![](examples/deploy-stand-alone-python/app.py)
+![](examples/deploy-stand-alone-python/test_app.py)
+![](examples/deploy-stand-alone-python/requirements.txt)
+![](examples/deploy-stand-alone-python/Dockerfile)
+
+Locally
+
+```
+docker build -t flasker .
+docker run --rm  -p5000:5000 flasker
+http://localhost:5000/api/add?a=3&b=4
+```
+
+## Deployment on Digital Ocean
+{id: deployment-on-digital-ocean}
+
+
+* [Digital Ocean](https://cloud.digitalocean.com/)
+* Go to **Marketplace**, search for Docker
+* Click on **Create Docker Droplet**
+* Basic $5/month
+* New York is fine
+* Select SSH key
+
+```
+ssh root@remotehost
+
+DOCKER_HOST=ssh://user@remotehost docker build -t flasker .
+DOCKER_HOST=ssh://user@remotehost docker run -d --name flask --restart unless-stopped  -p5000:5000 flasker
+```
+
+* We use the `-d` flag to convert it into a daemon
+* We use `--restart unless-stopped` to tell Docker to restert on reboot
+
+* List containers
+
+```
+DOCKER_HOST="ssh://user@remotehost" docker ps
+```
+
+Upgrade:
+
+```
+DOCKER_HOST=ssh://user@remotehost docker build -t flasker .
+DOCKER_HOST=ssh://user@remotehost docker container stop flask
+DOCKER_HOST=ssh://user@remotehost docker container rm flask
+DOCKER_HOST=ssh://user@remotehost docker run -d --name flask --restart unless-stopped  -p5000:5000 flasker
+```
+
+* [restart policy](https://docs.docker.com/config/containers/start-containers-automatically/)
+
+
+TODO: persistent data
+
+## Multi-container Application to deploy
+{id: multi-container-application}
+
+* A multi-container Docker app usin Docker Compose
+
+
+## Digital Ocean with Docker compose
+{id: digital-ocean-docker-compose}
+
+* [article](https://www.docker.com/blog/how-to-deploy-on-remote-docker-hosts-with-docker-compose/)
+* Create Droplet based on Docker
+* ssh to it, `apt-get update`,  `apt-get dist-upgrade`, `reboot`
+* `DOCKER_HOST="ssh://user@remotehost" docker-compose up -d`
+
+Re-deploy
+
+* `DOCKER_HOST="ssh://user@remotehost" docker-compose build web`
+* `DOCKER_HOST="ssh://user@remotehost" docker-compose up -d web`
+
diff --git a/docker/docker.json b/docker/docker.json
@@ -14,6 +14,7 @@
         "perl.md",
         "networking.md",
         "postgresql.md",
+        "deploy.md",
         "appendix.md",
         "old.md"
     ]

diff --git a/docker/examples/deploy-stand-alone-python/Dockerfile b/docker/examples/deploy-stand-alone-python/Dockerfile
@@ -1,8 +1,11 @@
 FROM python:3.7
+
 COPY requirements.txt /opt/
-COPY app.py /opt/
 RUN pip3 install -r /opt/requirements.txt
 
+
+COPY app.py /opt/
+
 WORKDIR /opt
 #CMD FLASK_APP=app FLASK_DEBUG=1 flask run --host 0.0.0.0 --port 5000
 CMD ["flask", "run", "--host", "0.0.0.0", "--port", "5000"]

diff --git a/docker/examples/deploy-stand-alone-python/app.py b/docker/examples/deploy-stand-alone-python/app.py
@@ -1,10 +1,36 @@
 from flask import Flask, request, jsonify
+import os
+import datetime
+
+version = 4
 
 app = Flask(__name__)
 
+filename = 'counter.txt'
+dirname = os.environ.get('COUNTER_DIR')
+if dirname:
+    filename = os.path.join(dirname, filename)
+
 @app.route("/", methods=['GET'])
 def main():
-    return 'Calculator'
+    now = datetime.datetime.now()
+    return f'''
+        <html>
+          <head><title>Calculator v{version}</title></head>
+          <body>Calculator v{version} at {now}</body>
+        </html>
+    '''
+
+@app.route("/count", methods=['GET'])
+def count():
+    counter = 0
+    if os.path.exists(filename):
+        with open(filename) as fh:
+            counter = int(fh.read())
+    counter += 1
+    with open(filename, 'w') as fh:
+        fh.write(str(counter))
+    return str(counter)
 
 @app.route("/api/add", methods=['GET'])
 def api_add():

diff --git a/docker/python.md b/docker/python.md
@@ -190,17 +190,3 @@ Using [https://hub.docker.com/r/tiangolo/uwsgi-nginx-flask/](https://hub.docker.
 docker build -t myapp .
 docker run -it --rm -p5001:80 myapp
 ```
-
-## Deployment on Digital Ocean
-{id: deployment-on-digital-ocean}
-
-* [article](https://www.docker.com/blog/how-to-deploy-on-remote-docker-hosts-with-docker-compose/)
-* Create Droplet based on Docker
-* ssh to it, `apt-get update`,  `apt-get dist-upgrade`, `reboot`
-* `DOCKER_HOST="ssh://user@remotehost" docker-compose up -d`
-
-Re-deploy
-
-* `DOCKER_HOST="ssh://user@remotehost" docker-compose build web`
-* `DOCKER_HOST="ssh://user@remotehost" docker-compose up -d web`
-