Nginx/Node/Redis and Flask/Redis Compose example (#222)
* Added Node, Nginx and Redis Project * Added Flask/Redispull/228/head
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FROM python:3.11.0a6-alpine3.15 |
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WORKDIR /code |
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COPY requirements.txt /code |
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RUN pip install -r requirements.txt --no-cache-dir |
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COPY . /code |
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CMD python app.py |
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## Compose sample application |
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|
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### Python/Flask application using a Redis database |
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|
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Project structure: |
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|
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``` |
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. |
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├── Dockerfile |
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├── README.md |
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├── app.py |
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├── docker-compose.yml |
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└── requirements.txt |
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``` |
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|
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[_docker-compose.yml_](docker-compose.yml) |
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|
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``` |
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services: |
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redis: |
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image: redislabs/redismod |
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ports: |
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- '6379:6379' |
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web: |
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build: . |
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ports: |
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- "5000:5000" |
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volumes: |
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- .:/code |
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depends_on: |
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- redis |
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``` |
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|
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## Deploy with docker-compose |
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|
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``` |
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$ docker-compose up -d |
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[+] Running 24/24 |
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⠿ redis Pulled |
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... |
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⠿ 565225d89260 Pull complete |
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[+] Building 12.7s (10/10) FINISHED |
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=> [internal] load build definition from Dockerfile ... |
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[+] Running 3/3 |
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⠿ Network flask-redis_default Created |
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⠿ Container flask-redis-redis-1 Started |
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⠿ Container flask-redis-web-1 Started |
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``` |
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|
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## Expected result |
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|
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Listing containers must show one container running and the port mapping as below: |
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``` |
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|
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$ docker-compose ps |
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NAME COMMAND SERVICE STATUS PORTS |
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flask-redis-redis-1 "redis-server --load…" redis running 0.0.0.0:6379->6379/tcp |
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flask-redis-web-1 "/bin/sh -c 'python …" web running 0.0.0.0:5000->5000/tcp |
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``` |
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|
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After the application starts, navigate to `http://localhost:5000` in your web browser or run: |
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``` |
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$ curl localhost:5000 |
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This webpage has been viewed 2 time(s) |
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``` |
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|
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## Monitoring Redis keys |
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|
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Connect to redis database by using ```redis-cli``` command and monitor the keys. |
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``` |
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redis-cli -p 6379 |
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127.0.0.1:6379> monitor |
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OK |
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1646634062.732496 [0 172.21.0.3:33106] "INCRBY" "hits" "1" |
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1646634062.735669 [0 172.21.0.3:33106] "GET" "hits" |
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``` |
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|
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Stop and remove the containers |
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``` |
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$ docker-compose down |
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``` |
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from flask import Flask |
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from redis import Redis |
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app = Flask(__name__) |
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redis = Redis(host='redis', port=6379) |
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@app.route('/') |
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def hello(): |
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redis.incr('hits') |
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counter = str(redis.get('hits'),'utf-8') |
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return "This webpage has been viewed "+counter+" time(s)" |
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if __name__ == "__main__": |
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app.run(host="0.0.0.0", debug=True) |
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services: |
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redis: |
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image: redislabs/redismod |
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ports: |
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- '6379:6379' |
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web: |
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build: . |
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ports: |
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- "5000:5000" |
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volumes: |
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- .:/code |
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depends_on: |
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- redis |
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flask |
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redis |
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|
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services: |
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redis: |
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image: 'redislabs/redismod' |
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ports: |
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- '6379:6379' |
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web1: |
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restart: on-failure |
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build: ./web |
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hostname: web1 |
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ports: |
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- '81:5000' |
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web2: |
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restart: on-failure |
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build: ./web |
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hostname: web2 |
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ports: |
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- '82:5000' |
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nginx: |
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build: ./nginx |
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ports: |
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- '80:80' |
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depends_on: |
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- web1 |
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- web2 |
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|
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|
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FROM nginx:1.21.6 |
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RUN rm /etc/nginx/conf.d/default.conf |
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COPY nginx.conf /etc/nginx/conf.d/default.conf |
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upstream loadbalancer { |
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server web1:5000; |
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server web2:5000; |
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} |
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|
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server { |
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listen 80; |
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server_name localhost; |
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location / { |
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proxy_pass http://loadbalancer; |
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} |
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} |
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node_modules |
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FROM node:14.17.3-alpine3.14 |
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WORKDIR /usr/src/app |
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COPY package.json package-lock.json ./ |
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RUN npm ci |
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COPY ./server.js ./ |
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CMD ["npm","start"] |
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{ |
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"name": "web", |
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"version": "1.0.0", |
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"lockfileVersion": 1, |
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"requires": true, |
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"requires": { |
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"negotiator": "0.6.3" |
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"integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w=" |
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"unpipe": "1.0.0" |
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} |
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}, |
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"requires": { |
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}, |
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"send": { |
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"depd": "~1.1.2", |
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"destroy": "~1.0.4", |
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"encodeurl": "~1.0.2", |
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"escape-html": "~1.0.3", |
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"etag": "~1.8.1", |
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"fresh": "0.5.2", |
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"http-errors": "1.8.1", |
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"mime": "1.6.0", |
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"ms": "2.1.3", |
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"on-finished": "~2.3.0", |
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"range-parser": "~1.2.1", |
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"statuses": "~1.5.0" |
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}, |
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}, |
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"requires": { |
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"encodeurl": "~1.0.2", |
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"escape-html": "~1.0.3", |
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"parseurl": "~1.3.3", |
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"send": "0.17.2" |
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} |
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}, |
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"setprototypeof": { |
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"requires": { |
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"media-typer": "0.3.0", |
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"mime-types": "~2.1.24" |
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} |
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}, |
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"unpipe": { |
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"version": "1.0.0", |
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"resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz", |
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"utils-merge": { |
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}, |
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"vary": { |
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"version": "1.1.2", |
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} |
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} |
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} |
@ -0,0 +1,15 @@ |
||||
{ |
||||
"name": "web", |
||||
"version": "1.0.0", |
||||
"description": "Running Node.js and Express.js on Docker", |
||||
"main": "server.js", |
||||
"scripts": { |
||||
"start": "node server.js" |
||||
}, |
||||
"dependencies": { |
||||
"express": "^4.17.2", |
||||
"redis": "3.1.2" |
||||
}, |
||||
"author": "", |
||||
"license": "MIT" |
||||
} |
@ -0,0 +1,24 @@ |
||||
const os = require('os'); |
||||
const express = require('express'); |
||||
const app = express(); |
||||
const redis = require('redis'); |
||||
const redisClient = redis.createClient({ |
||||
host: 'redis', |
||||
port: 6379 |
||||
}); |
||||
|
||||
app.get('/', function(req, res) { |
||||
redisClient.get('numVisits', function(err, numVisits) { |
||||
numVisitsToDisplay = parseInt(numVisits) + 1; |
||||
if (isNaN(numVisitsToDisplay)) { |
||||
numVisitsToDisplay = 1; |
||||
} |
||||
res.send(os.hostname() +': Number of visits is: ' + numVisitsToDisplay); |
||||
numVisits++; |
||||
redisClient.set('numVisits', numVisits); |
||||
}); |
||||
}); |
||||
|
||||
app.listen(5000, function() { |
||||
console.log('Web application is listening on port 5000'); |
||||
}); |
Loading…
Reference in new issue