Implementation of crawler Scrapy image created by dockerfile based on alpine

1. Download the alpine image

[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

2. Write Dockerfile

Create a scrapy directory to store the dockerfile file

[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
Total dosage 4
-rw-r--r-- 1 root root 1394 Oct 10 11:36 Dockerfile

Writing a Dockerfile

# Specify the created base image FROM alpine
 
# Author description information MAINTAINER alpine_python3_scrapy ([email protected])
 
# Replace the Alibaba Cloud source 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
 
# Synchronize time # Update the source, install openssh, modify the configuration file, generate the key and synchronize the time 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
 
# Install Scrapy dependency packages (required dependencies)
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
 
# The installation environment requires pip packages (packages here can be added or deleted as needed)
RUN pip3 install --default-timeout=100 --no-cache-dir --upgrade pip setuptools pymysql pymongo redis scrapy-redis ipython Scrapy requests
 
# Start the ssh script RUN echo "/usr/sbin/sshd -D" >> /etc/start.sh && \
  chmod +x /etc/start.sh
 
# Open port 22 EXPOSE 22
 
# Execute the ssh startup command CMD ["/bin/sh","/etc/start.sh"]

The container can remotely access Scrapy installed in Python3 environment through SSH, and start the SSH service through the start.sh script

3. Create an image

Create an image

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

View Mirror

[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

4. Create a container

Create a container (named scrapy10086, the remote port is mapped to the host port 10086)

Copy the code as follows:

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

View Container

[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

[root@DockerBrian scrapy]# ssh [email protected] -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.
[email protected]'s password: # The password here is defined in dockerfile 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:~#

5. Testing

Create a scrapy project test

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#

Test success

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