instruction: Create a Dockerfile for orchestration
output: ```dockerfile
  from
  its image. You could run multiple sites with exactly the same image but
  separate configurations, without the need to build a custom image at all.Example: Rotate a configTo rotate a config, you first save a new config with a different name than the
  one that is currently in use. You then redeploy the service, removing the old
  config and adding the new config at the same mount point within the container.
  This example builds upon the previous one by rotating the site.conf
  configuration file.Edit the site.conf file locally. Add index.php to the index line, and
  save the file.
  
  server {
   listen 443 ssl;
   server_name localhost;
   ssl_certificate /run/secrets/site.crt;
   ssl_certificate_key /run/secrets/site.key;
  
   location / {
   root /usr/share/nginx/html;
   index index.html index.htm index.php;
   }
  }Create a new Docker config using the new site.conf, called site-v2.conf.
  
  $ docker config create site-v2.conf site.confUpdate the nginx service to use the new config instead of the old one.
  
  $ docker service update \
   --config-rm site.conf \
   --config-add source=site-v2.conf,target=/etc/nginx/conf.d/site.conf,mode=0440 \
   nginx
  Verify that the nginx service is fully re-deployed, using
  docker service ps nginx. When it is, you can remove the old site.conf
  config.
  
  $ docker config rm site.conf
  To clean up, you can remove the nginx service, as well as the secrets and
  configs.
  
  $ docker service rm nginx
  
  $ docker secret rm site.crt site.key
  
  $ docker config rm site-v2.conf
  You have now updated your nginx service's configuration without the need to
  rebuild its image.
  Request changesTable of contentsAbout configsWindows supportHow Docker manages configsRead more about docker config commandsExamplesDefining and using configs in compose filesSimple example: Get started with configsSimple example: Use configs in a Windows serviceExample: Use a templated configAdvanced example: Use configs with a Nginx serviceExample: Rotate a config
  
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