7
?
Docker Compose . Compose YAML. Compose .
:
$ mkdir composetest $ cd composetest
app.py :
import time
import redis
from flask import Flask
app = Flask(__name__)
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.route('/')
def hello():
count = get_hit_count()
return 'Hello World! I have been seen {} times.\n'.format(count)
- redis, 6379. needs.txt :
flask Redis
Dockerfile, .
Dockerfile ( ) :
FROM python:3.7-alpine WORKDIR /code ENV FLASK_APP app.py ENV FLASK_RUN_HOST 0.0.0.0 RUN apk add --no-cache gcc musl-dev linux-headers COPY requirements.txt requirements.txt RUN pip install -r requirements.txt COPY . . CMD ["flask", "run"]
docker-compose.yml :
version: '3'
services:
web:
build: .
ports:
- "5000:5000"
redis:
image: "redis:alpine"
: Web Redis, .
C Compose , , docker-compose. :
$ docker-compose up Creating network "composetest_default" with the default driver Creating composetest_web_1 ... Creating composetest_redis_1 ... Creating composetest_web_1 Creating composetest_redis_1 ... done Attaching to composetest_web_1, composetest_redis_1 web_1 | * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit) redis_1 | 1:C 17 Aug 22:11:10.480 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo redis_1 | 1:C 17 Aug 22:11:10.480 # Redis version=4.0.1, bits=64, commit=00000000, modified=0, pid=1, just started redis_1 | 1:C 17 Aug 22:11:10.480 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf web_1 | * Restarting with stat redis_1 | 1:M 17 Aug 22:11:10.483 * Running mode=standalone, port=6379. redis_1 | 1:M 17 Aug 22:11:10.483 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. web_1 | * Debugger is active! redis_1 | 1:M 17 Aug 22:11:10.483 # Server initialized redis_1 | 1:M 17 Aug 22:11:10.483 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled. web_1 | * Debugger PIN: 330-787-903 redis_1 | 1:M 17 Aug 22:11:10.483 * Ready to accept connections
Compose Redis, . . ?
http://localhost:5000/ , .
Docker Linux, Docker Desktop Mac Docker Desktop Windows, - "" 5000 Docker. - http://localhost:5000, Hello World. , http://127.0.0.1:5000.
Docker Machine Mac Windows, ip MACHINE_VM docker-machine IP- Docker. http://MACHINE_VM_IP:5000 .
:
Hello World! I have been seen 1 times.
docker image ls, /. redis web.
$ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE composetest_web latest e2c21aa48cc1 4 minutes ago 93.8MB python 3.4-alpine 84e6077c7ab6 7 days ago 82.5MB redis alpine 9d8fa9aa0e5b 3 weeks ago 27.5MB
: Docker Inspect Tag ID
docker-compose , CTRL + C , Compose.
docker-compose.yml -
version: '3'
services:
web:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
environment:
FLASK_ENV: development
redis:
image: "redis:alpine"
, . FLASK_ENV, . : .
docker-compose up, Compose, .
$ docker-compose up Creating network "composetest_default" with the default driver Creating composetest_web_1 ... Creating composetest_redis_1 ... Creating composetest_web_1 Creating composetest_redis_1 ... done Attaching to composetest_web_1, composetest_redis_1 web_1 | * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
, .
app.py :
Hello from Docker!:
return 'Hello from Docker! I have been seen {} times.\n'.format(count)
( F5 Ctrl + F5) . , .
. , :
docker-compose up and use docker-compose ps to see what is currently running: $ docker-compose up -d Starting composetest_redis_1... Starting composetest_web_1... $ docker-compose ps Name Command State Ports ------------------------------------------------------------------- composetest_redis_1 /usr/local/bin/run Up composetest_web_1 /bin/sh -c python app.py Up 5000->5000/tcp
docker-compose run . , , -:
$ docker-compose run web env
docker-compose help, .
Compose docker-compose up -d, , :$ docker-compose stop
, down.
