docker_transparent_proxy.sh

#!/bin/bash
REGISTRY_PORT=5000
CACHE_DIR=$HOME/docker_cache


mkdir -p $CACHE_DIR
chmod a+rwX $CACHE_DIR

yum install docker -y
cat <<EOF >$CACHE_DIR/config.yml
version: 0.1
log:
  fields:
    service: registry
storage:
  cache:
    blobdescriptor: inmemory
  filesystem:
    rootdirectory: /var/lib/registry
http:
  addr: :5000
  headers:
    X-Content-Type-Options: [nosniff]
proxy:
  remoteurl: https://registry-1.docker.io
health:
  storagedriver:
    enabled: true
    interval: 10s
    threshold: 3
EOF

chmod a+rw -R $CACHE_DIR
sudo systemctl start docker
sudo systemctl enable docker
sudo systemctl stop firewalld # caution!

docker run -d --restart=always -p $REGISTRY_PORT:5000 --name proxy-v2-mirror -v $CACHE_DIR:/var/lib/registry:z registry:2 /var/lib/registry/config.yml

# Configure client aschmod a+rw -R $CACHE_DIR
#
sudo cat <<EOF >/etc/docker/daemon.json
{
      "insecure-registries" : ["localhost:$REGISTRY_PORT"],
      "registry-mirrors": ["http://localhost:$REGISTRY_PORT"]
}
EOF
#