title: Docker compose failed build for scrapy-cluster
body: <p>I am running the <a href="https://scrapy-cluster.readthedocs.io/en/latest/topics/introduction/quickstart.html#cluster-quickstart" rel="nofollow noreferrer">docker quick-start</a>  from the scrapy-cluster library. Everything works well when running <code>docker-compose up -d</code> in terms of <code>redis</code>, <code>kafka</code> and <code>zookeeper</code> images are successfully installed however, it gets to this line:</p>
  <pre><code>Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
  Building crawler
  [+] Building 3.3s (6/15)                                                                                                                                                               
   =&gt; [internal] load build definition from Dockerfile.py3                                                                                                                          0.0s
   =&gt; =&gt; transferring dockerfile: 919B                                                                                                                                              0.0s
   =&gt; [internal] load .dockerignore                                                                                                                                                 0.0s
   =&gt; =&gt; transferring context: 2B                                                                                                                                                   0.0s
   =&gt; [internal] load metadata for docker.io/library/python:3.6                                                                                                                     0.2s
   =&gt; CACHED [ 1/11] FROM docker.io/library/python:3.6@sha256:f8652afaf88c25f0d22354d547d892591067aa4026a7fa9a6819df9f300af6fc                                                      0.0s
   =&gt; [internal] load build context                                                                                                                                                 0.0s
   =&gt; =&gt; transferring context: 184.10kB                                                                                                                                             0.0s
   =&gt; ERROR [ 2/11] RUN apt-get update &amp;&amp; apt-get -y install   python-lxml   build-essential   libssl-dev   libffi-dev   python-dev   libxml2-dev   libxslt1-dev   &amp;&amp; rm -rf /var/  3.0s
  ------                                                                                                                                                                                 
   &gt; [ 2/11] RUN apt-get update &amp;&amp; apt-get -y install   python-lxml   build-essential   libssl-dev   libffi-dev   python-dev   libxml2-dev   libxslt1-dev   &amp;&amp; rm -rf /var/lib/apt/lists/*:                                                                                                                                                                                     
  #5 0.238 Get:1 http://security.debian.org/debian-security bullseye-security InRelease [44.1 kB]                                                                                        
  #5 0.241 Get:2 http://deb.debian.org/debian bullseye InRelease [116 kB]                                                                                                                
  #5 0.269 Get:3 http://deb.debian.org/debian bullseye-updates InRelease [39.4 kB]                                                                                                       
  #5 0.337 Get:4 http://security.debian.org/debian-security bullseye-security/main amd64 Packages [164 kB]
  #5 0.402 Get:5 http://deb.debian.org/debian bullseye/main amd64 Packages [8182 kB]
  #5 1.463 Get:6 http://deb.debian.org/debian bullseye-updates/main amd64 Packages [2592 B]
  #5 2.142 Fetched 8548 kB in 2s (4326 kB/s)
  #5 2.142 Reading package lists...
  #5 2.492 Reading package lists...
  #5 2.871 Building dependency tree...
  #5 2.965 Reading state information...
  #5 3.018 E: Unable to locate package python-lxml
  ------
  executor failed running [/bin/sh -c apt-get update &amp;&amp; apt-get -y install   python-lxml   build-essential   libssl-dev   libffi-dev   python-dev   libxml2-dev   libxslt1-dev   &amp;&amp; rm -rf /var/lib/apt/lists/*]: exit code: 100
  ERROR: Service 'crawler' failed to build : Build failed
  
  </code></pre>
  <p>Then it fails, perhaps these libraries are not in the <code>requirements.txt</code> file, and it is throwing the error. How do I correct this?</p>