基于alpine用dockerfile创建的爬虫Scrapy镜像的实现

一、下载alpine镜像

[root@DockerBrian ~]# docker pull alpine
Using default tag: latest
Trying to pull repository docker.io/library/alpine ...
latest: Pulling from docker.io/library/alpine
4fe2ade4980c: Pull complete
Digest: sha256:621c2f39f8133acb8e64023a94dbdf0d5ca81896102b9e57c0dc184cadaf5528
Status: Downloaded newer image for docker.io/alpine:latest
[root@docker43 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/alpine latest 196d12cf6ab1 3 weeks ago 4.41 MB 

二、编写Dockerfile

创建scrapy目录存放dockerfile文件

[root@DockerBrian ~]# mkdir /opt/alpineDockerfile/
[root@DockerBrian ~]# cd /opt/alpineDockerfile/
[root@DockerBrian alpineDockerfile]# mkdir scrapy && cd scrapy && touch Dockerfile
[root@DockerBrian alpineDockerfile]# cd scrapy/
[root@DockerBrian scrapy]# ll
总用量 4
-rw-r--r-- 1 root root 1394 10月 10 11:36 Dockerfile 

编写dockerfile文件

# 指定创建的基础镜像
FROM alpine

# 作者描述信息
MAINTAINER alpine_python3_scrapy (zhujingzhi@123.com)

# 替换阿里云的源
RUN echo "http://mirrors.aliyun.com/alpine/latest-stable/main/" > /etc/apk/repositories && \
  echo "http://mirrors.aliyun.com/alpine/latest-stable/community/" >> /etc/apk/repositories

# 同步时间

# 更新源、安装openssh 并修改配置文件和生成key 并且同步时间
RUN apk update && \
  apk add --no-cache openssh-server tzdata && \
  cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
  sed -i "s/#PermitRootLogin.*/PermitRootLogin yes/g" /etc/ssh/sshd_config && \
  ssh-keygen -t rsa -P "" -f /etc/ssh/ssh_host_rsa_key && \
  ssh-keygen -t ecdsa -P "" -f /etc/ssh/ssh_host_ecdsa_key && \
  ssh-keygen -t ed25519 -P "" -f /etc/ssh/ssh_host_ed25519_key && \
  echo "root:h056zHJLg85oW5xh7VtSa" | chpasswd

# 安装Scrapy依赖包(必须安装的依赖包)
RUN apk add --no-cache python3 python3-dev gcc openssl-dev openssl libressl libc-dev linux-headers libffi-dev libxml2-dev libxml2 libxslt-dev openssh-client openssh-sftp-server

# 安装环境需要pip包(这里的包可以按照需求添加或者删除)
RUN pip3 install --default-timeout=100 --no-cache-dir --upgrade pip setuptools pymysql pymongo redis scrapy-redis ipython Scrapy requests

# 启动ssh脚本
RUN echo "/usr/sbin/sshd -D" >> /etc/start.sh && \
  chmod +x /etc/start.sh

# 开放22端口
EXPOSE 22

# 执行ssh启动命令
CMD ["/bin/sh","/etc/start.sh"]

实现了容器可以SSH远程访问 基于Python3 环境安装的Scrapy，通过start.sh脚本启动SSH服务

三、创建镜像

创建镜像

[root@DockerBrian scrapy]# docker build -t scrapy_redis_ssh:v1 .

查看镜像

[root@DockerBrian scrapy]# docker images
REPOSITORY     TAG         IMAGE ID      CREATED       SIZE
scrapy_redis_ssh  v1         b2c95ef95fb9    4 hours ago     282 MB
docker.io/alpine  latest       196d12cf6ab1    4 weeks ago     4.41 MB 

四、创建容器

创建容器(名字为scrapy10086 远程端口是映射宿主机10086端口)

代码如下:

docker run -itd --restart=always --name scrapy10086 -p 10086:22 scrapy_redis_ssh:v1

查看容器

[root@DockerBrian scrapy]# docker ps
CONTAINER ID    IMAGE        COMMAND         CREATED       STATUS       PORTS          NAMES
7fb9e69d79f5    b2c95ef95fb9    "/bin/sh /etc/star..."  3 hours ago     Up 3 hours     0.0.0.0:10086->22/tcp  scrapy10086 

登录容器

[root@DockerBrian scrapy]# ssh root@127.0.0.1 -p 10086
The authenticity of host '[127.0.0.1]:10086 ([127.0.0.1]:10086)' can't be established.
ECDSA key fingerprint is SHA256:wC46AU6SLjHyEfQWX6d6ht9MdpGKodeMOK6/cONcpxk.
ECDSA key fingerprint is MD5:6a:b7:31:3c:63:02:ca:74:5b:d9:68:42:08:be:22:fc.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '[127.0.0.1]:10086' (ECDSA) to the list of known hosts.
root@127.0.0.1's password:                                # 这里的密码就是dockerfile中定义的 echo "root:h056zHJLg85oW5xh7VtSa" | chpasswd
Welcome to Alpine!

The Alpine Wiki contains a large amount of how-to guides and general
information about administrating Alpine systems.
See <http://wiki.alpinelinux.org>.

You can setup the system with the command: setup-alpine

You may change this message by editing /etc/motd.

7363738cc96a:~# 

五、测试

创建个scrapy项目测试

7363738cc96a:~# scrapy startproject test
New Scrapy project 'test', using template directory '/usr/lib/python3.6/site-packages/scrapy/templates/project', created in:
  /root/test

You can start your first spider with:
  cd test
  scrapy genspider example example.com
7363738cc96a:~# cd test/
7363738cc96a:~/test# ls
scrapy.cfg test
7363738cc96a:~/test# cd test/
7363738cc96a:~/test/test# ls
__init__.py   __pycache__   items.py    middlewares.py pipelines.py  settings.py   spiders
7363738cc96a:~/test/test# 

测试成功

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