2.1 Docker Compose笔记和模仿官网运行自己的redis登录计数器

2021-09-15 14:24:34

文章目录

DockerCompese能够做什么
- 官方介绍
- Compose概念
安装compose
测试一个Redis的计数器
自己定义一个类似于2.1中官方入门文档的redis登录计数器
yaml规则
配置个人博客WordPress

DockerCompese能够做什么

官方介绍

通过YAML file配置文件用来定义运行多个容器

介绍

Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application’s services. Then, with a single command, you create and start all the services from your configuration. To learn more about all the features of Compose, see the list of features.

Compose是一个用于定义和运行多容器Docker应用程序的工具。使用Compose，您可以使用YAML文件配置应用程序的服务。然后，使用一个命令，从配置中创建并启动所有服务。要了解更多关于Compose的所有功能，请参阅功能列表。

Compose works in all environments: production, staging, development, testing, as well as CI workflows. You can learn more about each case in Common Use Cases.

在所有环境中组合工作:生产、登台、开发、测试以及CI工作流。您可以在常用用例中了解关于每个用例的更多信息。

运行的三个步骤

Using Compose is basically a three-step process:

Define your app’s environment with a so it can be reproduced anywhere.Dockerfile
Define the services that make up your app in so they can be run together in an isolated environment.docker-compose.yml
Run and the Docker compose command starts and runs your entire app. You can alternatively run using the docker-compose binary.docker compose up``docker-compose up

使用Compose基本上是一个三步过程:

用Dockerfile定义你的应用的环境，这样它就可以被复制到任何地方。
通过docker-compose.yml定义组成你的应用的服务，这样它们就可以在一个独立的环境中一起运行。
运行Docker compose 命令启动并运行整个应用程序。你也可以使用Docker -compose二进制文件运行。通过’ docker-compose up '启动

yml文件示例

A looks like this:docker-compose.yml

version: "3.9"  # optional since v1.27.0
services:
  web:
    build: .
    ports:
      - "5000:5000"
    volumes:
      - .:/code
      - logvolume01:/var/log
    links:
      - redis
  redis:
    image: redis
volumes:
  logvolume01: {}

DockerFile build run可以手动开启一个容器

如果有100个容器就很麻烦

所以DockerCompese用来管理定义多个容器

Compose 是Docker官方的开源项目,需要单独安装

Compose概念

services 服务容器.应用 web redis mysql nginx等
preject 项目.一组关联的容器

安装compose

#官方下载
sudo curl -L "https://github.com/docker/compose/releases/download/1.26.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
#授权
chmod +x /usr/local/bin/docker-compose
# 加速下载
curl -L https://get.daocloud.io/docker/compose/releases/download/1.26.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
#授权
chmod +x /usr/local/bin/docker-compose

安装成功

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-7w79X4TH-1641034217001)(C:\Users\精神小伙\AppData\Roaming\Typora\typora-user-images\image-20211231131747632.png)]

测试一个Redis的计数器

应用app.py
Dockerfile 将应用打包为镜像
Docker-compose yaml文件定义整个服务,和需要的环境
启动compose dicker-compose up

Docker Compose |入门Docker 文档

步骤 1：设置

定义应用程序依赖项。

为项目创建目录：
```
$ mkdir composetest
$ cd composetest
```

创建一个在项目目录中调用的文件，并将其粘贴到：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)

在此示例中，是应用程序网络上 redis 容器的主机名。我们使用 Redis 的默认端口。redis``6379

创建在项目目录中调用的另一个文件，并将其粘贴到：requirements.txt

flask
redis

步骤 2：创建 Dockerfile

在此步骤中，您将编写一个构建 Docker 映像的 Docker 文件。该映像包含 Python 应用程序所需的所有依赖项，包括 Python 本身。

在项目目录中，创建一个名为以下内容并粘贴以下内容的文件：Dockerfile

# syntax=docker/dockerfile:1
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
EXPOSE 5000
COPY . .
CMD ["flask", "run"]

这告诉 Docker：

从 Python 3.7 映像开始构建映像。
将工作目录设置为。/code
设置命令使用的环境变量。flask
安装 gcc 和其他依赖项
复制并安装 Python 依赖项。requirements.txt
向映像添加元数据以描述容器正在侦听端口 5000
将项目中的当前目录复制到映像中的 workdir。.``.
将容器的缺省命令设置为。flask run

步骤 3：在撰写文件中定义服务

创建在项目目录中调用的文件并粘贴以下内容：docker-compose.yml

version: "3.9"
services:
  web:
    build: .
    ports:
      - "5000:5000"
  redis:
    image: "redis:alpine"

此撰写文件定义了两个服务：和。web``redis

网络服务

该服务使用从当前目录中生成的映像。然后，它将容器和主机绑定到公开的端口。此示例服务使用 Flask Web 服务器的缺省端口。web``Dockerfile``5000``5000

Redis 服务

该服务使用从 Docker Hub 注册表中提取的公共Redis映像。redis

步骤 4：使用撰写构建和运行应用

从项目目录中，通过运行启动应用程序。docker-compose up

docker-compose up

[root@iZ70eyv5ttqkcsZ composetest]# docker-compose up
Starting composetest_web_1   ... done
Starting composetest_redis_1 ... done
Attaching to composetest_redis_1, composetest_web_1
redis_1  | 1:C 31 Dec 2021 06:24:25.704 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis_1  | 1:C 31 Dec 2021 06:24:25.704 # Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=1, just started
redis_1  | 1:C 31 Dec 2021 06:24:25.704 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
redis_1  | 1:M 31 Dec 2021 06:24:25.705 * monotonic clock: POSIX clock_gettime
redis_1  | 1:M 31 Dec 2021 06:24:25.719 * Running mode=standalone, port=6379.
redis_1  | 1:M 31 Dec 2021 06:24:25.719 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
redis_1  | 1:M 31 Dec 2021 06:24:25.719 # Server initialized
redis_1  | 1:M 31 Dec 2021 06:24:25.719 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
redis_1  | 1:M 31 Dec 2021 06:24:25.732 * Loading RDB produced by version 6.2.6
redis_1  | 1:M 31 Dec 2021 06:24:25.732 * RDB age 64 seconds
redis_1  | 1:M 31 Dec 2021 06:24:25.732 * RDB memory usage when created 0.77 Mb
redis_1  | 1:M 31 Dec 2021 06:24:25.732 # Done loading RDB, keys loaded: 0, keys expired: 0.
redis_1  | 1:M 31 Dec 2021 06:24:25.732 * DB loaded from disk: 0.012 seconds
redis_1  | 1:M 31 Dec 2021 06:24:25.732 * Ready to accept connections
web_1    |  * Serving Flask app 'app.py' (lazy loading)
web_1    |  * Environment: production
web_1    |    WARNING: This is a development server. Do not use it in a production deployment.
web_1    |    Use a production WSGI server instead.
web_1    |  * Debug mode: off
web_1    |  * Running on all addresses.
web_1    |    WARNING: This is a development server. Do not use it in a production deployment.
web_1    |  * Running on http://172.19.0.3:5000/ (Press CTRL+C to quit)
web_1    | 172.19.0.1 - - [31/Dec/2021 06:25:28] "GET / HTTP/1.1" 200 -
web_1    | 172.19.0.1 - - [31/Dec/2021 06:25:30] "GET / HTTP/1.1" 200 -
web_1    | 172.19.0.1 - - [31/Dec/2021 06:25:31] "GET / HTTP/1.1" 200 -
web_1    | 172.19.0.1 - - [31/Dec/2021 06:25:31] "GET / HTTP/1.1" 200 -
web_1    | 172.19.0.1 - - [31/Dec/2021 06:25:32] "GET / HTTP/1.1" 200 -

运行结果验证

[root@iZ70eyv5ttqkcsZ composetest]# curl localhost:5000
Hello World! I have been seen 1 times.
[root@iZ70eyv5ttqkcsZ composetest]# curl localhost:5000
Hello World! I have been seen 2 times.
[root@iZ70eyv5ttqkcsZ composetest]# curl localhost:5000
Hello World! I have been seen 3 times.
[root@iZ70eyv5ttqkcsZ composetest]# curl localhost:5000
Hello World! I have been seen 4 times.
[root@iZ70eyv5ttqkcsZ composetest]# curl localhost:5000
Hello World! I have been seen 5 times.

docker ps

[root@iZ70eyv5ttqkcsZ ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                               NAMES
ae49ff137c76        redis:alpine        "docker-entrypoint..."   16 minutes ago      Up 19 seconds       6379/tcp                            composetest_redis_1
96f13de97b4d        composetest_web     "flask run"              16 minutes ago      Up 19 seconds       0.0.0.0:5000->5000/tcp              composetest_web_1

docker network ls

[root@iZ70eyv5ttqkcsZ ~]# docker network ls
NETWORK ID          NAME                  DRIVER              SCOPE
b8ea21e99b8a        bridge                bridge              local
44dd29d47235        composetest_default   bridge              local
92d4ae51b461        host                  host                local
ee8ffcd2dc27        mynet                 bridge              local
fb8882d50635        none                  null                local
c619a62c8c7b        redis                 bridge              local
[root@iZ70eyv5ttqkcsZ ~]# docker network inspect  composetest_default 
[
    {
        "Name": "composetest_default",
        "Id": "44dd29d472355fa3528ec960a9f72e6b957549e8971e4c2403a7d8f235544540",
        "Created": "2021-12-31T13:33:59.722342545+08:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.19.0.0/16",
                    "Gateway": "172.19.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": true,
        "Containers": {
            "96f13de97b4d107cfed410c4628b8f5106b8677bad0d550b1b21e05e427d155a": {
                "Name": "composetest_web_1",
                "EndpointID": "efe58cb37c53adfd63361851aebd51f751c59e0f8efe3aae590f317294f44397",
                "MacAddress": "02:42:ac:13:00:03",
                "IPv4Address": "172.19.0.3/16",
                "IPv6Address": ""
            },
            "ae49ff137c767a414dbe30be88f41f70a21a4c58fd79d0628a59f448b5455326": {
                "Name": "composetest_redis_1",
                "EndpointID": "91472b74fed591aa7430236af50b8ebab8785d78b6ff3672f8f0a7606447bfb3",
                "MacAddress": "02:42:ac:13:00:02",
                "IPv4Address": "172.19.0.2/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {
            "com.docker.compose.network": "default",
            "com.docker.compose.project": "composetest",
            "com.docker.compose.version": "1.26.2"
        }
    }
]

报错

因为docker-compose.yml中的版本在写下的时候已经为3.9所以报错,可以将其改为3.3就可以正常运行了

docker-compose.yml文件内容

version: "3.3" #之前为3.9
services:
  web:
    build: .
    ports:
      - "5000:5000"
  redis:
    image: "redis:alpine"

[root@iZ70eyv5ttqkcsZ composetest]# docker-compose up
ERROR: Version in "./docker-compose.yml" is unsupported. You might be seeing this error because you're using the wrong Compose file version. Either specify a supported version (e.g "2.2" or "3.3") and place your service definitions under the `services` key, or omit the `version` key and place your service definitions at the root of the file to use version 1.
For more on the Compose file format versions, see https://docs.docker.com/compose/compose-file/

自己定义一个类似于2.1中官方入门文档的redis登录计数器

创建一个springboot微服务项目

HelloController

package com.example.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    @Autowired
    StringRedisTemplate redisTemplate;

    @GetMapping("/hello")
    public String hello(){
        Long views = redisTemplate.opsForValue().increment("views");
        return "hello,voews" + views;

    }
}

application.properties 在本地运行不了,在服务器上进行redis的ip替换

server.port=8080
spring.redis.host=redis

Dockerfile 定义应用环境

FROM java:8
COPY *.jar /app.jar  #拷贝所有jar包到容器内
CMD ["--server.port=8080"]	
EXPOSE 8080		
ENTRYPOINT ["java","-jar","/app.jar"]

docker-compose.yaml 定义组成应用的服,让它可以在一个独立的环境运行

version: '3.8'
services:
  myapp:
    build: .
    image: myapp
    depends_on:  #依托于redis,redis会先于这个服务启动
      - redis
    ports:
      - "8080:8080"
  redis:
    image: "library/redis:alpine" #指定镜像

编写完成后,进行打包工作,将文件全部放在同一目录下输入命令docker-compose up完成启动服务并部署.

成功进行启动

[root@iZ70eyv5ttqkcsZ weifuwuApp]# docker-compose up --build
Building myapp
Step 1/5 : FROM java:8
 ---> d23bdf5b1b1b
Step 2/5 : COPY *.jar /app.jar
 ---> 5dc157d72b42
Removing intermediate container 7f46d50025c3
Step 3/5 : CMD --server.port=8080
 ---> Running in fb354ee24460
 ---> 94d8590875bd
Removing intermediate container fb354ee24460
Step 4/5 : EXPOSE 8080
 ---> Running in c4559d699ca8
 ---> deb879ec8fce
Removing intermediate container c4559d699ca8
Step 5/5 : ENTRYPOINT java -jar /app.jar
 ---> Running in ff8a60f57fb2
 ---> 09637f6055fc
Removing intermediate container ff8a60f57fb2
Successfully built 09637f6055fc
Creating weifuwuapp_redis_1 ... done
Creating weifuwuapp_myapp_1 ... done
Attaching to weifuwuapp_redis_1, weifuwuapp_myapp_1
redis_1  | 1:C 31 Dec 2021 16:23:38.766 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis_1  | 1:C 31 Dec 2021 16:23:38.766 # Redis version=6.2.6, bits=64, commit=00000000, modified=0, pid=1, just started
redis_1  | 1:C 31 Dec 2021 16:23:38.766 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
redis_1  | 1:M 31 Dec 2021 16:23:38.767 * monotonic clock: POSIX clock_gettime
redis_1  | 1:M 31 Dec 2021 16:23:38.776 * Running mode=standalone, port=6379.
redis_1  | 1:M 31 Dec 2021 16:23:38.776 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
redis_1  | 1:M 31 Dec 2021 16:23:38.776 # Server initialized
redis_1  | 1:M 31 Dec 2021 16:23:38.776 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
redis_1  | 1:M 31 Dec 2021 16:23:38.776 * Ready to accept connections
myapp_1  | 
myapp_1  |   .   ____          _            __ _ _
myapp_1  |  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
myapp_1  | ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
myapp_1  |  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
myapp_1  |   '  |____| .__|_| |_|_| |_\__, | / / / /
myapp_1  |  =========|_|==============|___/=/_/_/_/
myapp_1  |  :: Spring Boot ::                (v2.6.2)
myapp_1  | 
myapp_1  | 2021-12-31 16:23:44.447  INFO 1 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication v0.0.1-SNAPSHOT using Java 1.8.0_111 on 143e4f05fbed with PID 1 (/app.jar started by root in /)
myapp_1  | 2021-12-31 16:23:44.450  INFO 1 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default

测试结果

[root@iZ70eyv5ttqkcsZ ~]# curl localhost:8080/hello
hello,voews1[root@iZ70eyv5ttqkcsZ ~]# curl localhost:8080/hello
hello,voews2[root@iZ70eyv5ttqkcsZ ~]#

docker-compose up --build 启动项目的时候可以重新构建

yaml规则

官方指南Docker 文档

# 3层

version: '' # 版本
services: # 服务
	服务1: web
		# 服务配置
		images
		build
		network
		......
	服务2: redis
		.....
	服务3: mysql
		.....
# 其他配置 网络/卷 全局规则
volumes：
networks：
configs

配置个人博客WordPress

Quickstart: Compose and WordPress | Docker Documentation

Change into your project directory.

For example, if you named your directory my_wordpress:
```
$ cd my_wordpress/
```

Create a docker-compose.yml file that starts your WordPress blog and a separate MySQL instance with volume mounts for data persistence:

version: "3.9"
    
services:
  db:
    image: mysql:5.7
    volumes:
      - db_data:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: somewordpress
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
    
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    volumes:
      - wordpress_data:/var/www/html
    ports:
      - "8000:80"
    restart: always
    environment:
      WORDPRESS_DB_HOST: db
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
      WORDPRESS_DB_NAME: wordpress
volumes:
  db_data: {}
  wordpress_data: {}

使用docker-compose up启动

之后就可以进入著名的5分钟访问了

码农公寓

文章目录

DockerCompese能够做什么

官方介绍

Compose概念

安装compose

测试一个Redis的计数器

步骤 1：设置

步骤 2：创建 Dockerfile

步骤 3：在撰写文件中定义服务

网络服务

Redis 服务

步骤 4：使用撰写构建和运行应用

docker-compose up

运行结果验证

docker ps

docker network ls

报错

文章目录

自己定义一个类似于2.1中官方入门文档的redis登录计数器

创建一个springboot微服务项目

成功进行启动

测试结果

yaml规则

配置个人博客WordPress

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