Lab 03: Containerisation and Docker · Jimmy Huang's Blog

Lab 03: Containerisation and Docker · Jimmy Huang's Blog

bash

echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

bash

cat > my_script.py <<'EOF'
from typing import Union
from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def hello():
    return "Welcome to FIT5225!"

@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
EOF

bash

cat > Dockerfile <<'EOF'
FROM python:3.12-alpine
WORKDIR /code
COPY my_script.py /code
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
CMD ["python","-m","fastapi","run","/code/my_script.py"]
EOF

bash

cat > app.py <<'EOF'
import time
import redis
from fastapi import FastAPI

app = FastAPI()

cache = redis.Redis(host='redis', port=6379)

def get_hit_count():
    retries = 5
    while True:
        try:
            return cache.incr('hits')
        except redis.exceptions.ConnectionError as exc:
            if retries == 0:
                raise exc
            retries -= 1
            time.sleep(0.5)

@app.get('/')
def hello():
    count = get_hit_count()
    return 'Hello World! I have been seen {} times.\n'.format(count)
EOF

bash

cat > Dockerfile <<'EOF'
FROM python:3.12-alpine
WORKDIR /code
RUN apk add --no-cache gcc musl-dev linux-headers
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
COPY . .
CMD ["python","-m","fastapi","run","app.py"]
EOF

bash

project/
├── docker-compose.yml
├── web/
│   ├── Dockerfile
│   ├── app.py
│   └── requirements.txt
├── worker/
│   ├── Dockerfile
│   └── worker.py
└── frontend/
    ├── Dockerfile
    └── package.json