title: Setting environment variable in a docker container
body: <p>I am trying to set environment variables in a docker container but I get the following error </p>
  
  <pre><code> starting container process caused "exec: \"-e\": executable file not found in $PATH": unknown
  </code></pre>
  
  <p>Here is how I set the variables </p>
  
  <pre><code>docker run image -e ENV_VAR= '{"a":{"b":"c"}}' -p 3000:3000 
  </code></pre>
  
  <p>What am I missing?</p>