$ sudo docker daemon -hUsage: docker daemon [OPTIONS]Enable daemon mode --add-registry=[]          Registry to query before a public one --api-cors-header=          Set CORS headers in the remote API -b, --bridge=            Attach containers to a network bridge --bip=                Specify network bridge IP --block-registry=[]         Don't contact given registry --cluster-advertise=         Address or interface name to advertise --cluster-store=           Set the cluster store --cluster-store-opt=map[]      Set cluster store options --confirm-def-push=true       Confirm a push to default registry -D, --debug=false          Enable debug mode --default-gateway=          Container default gateway IPv4 address --default-gateway-v6=        Container default gateway IPv6 address --default-ulimit=[]         Set default ulimits for containers --disable-legacy-registry=false   Do not contact legacy registries --dns=[]               DNS server to use --dns-opt=[]             DNS options to use --dns-search=[]           DNS search domains to use -e, --exec-driver=native       Exec driver to use --exec-opt=[]            Set exec driver options --exec-root=/var/run/docker     Root of the Docker execdriver --fixed-cidr=            IPv4 subnet for fixed IPs --fixed-cidr-v6=           IPv6 subnet for fixed IPs -G, --group=docker          Group for the unix socket -g, --graph=/var/lib/docker     Root of the Docker runtime -H, --host=[]            Daemon socket(s) to connect to --help=false             Print usage --icc=true              Enable inter-container communication --insecure-registry=[]        Enable insecure registry communication --ip=0.0.0.0             Default IP when binding container ports --ip-forward=true          Enable net.ipv4.ip_forward --ip-masq=true            Enable IP masquerading --iptables=true           Enable addition of iptables rules --ipv6=false             Enable IPv6 networking -l, --log-level=info         Set the logging level --label=[]              Set key=value labels to the daemon --log-driver=json-file        Default driver for container logs --log-opt=map[]           Set log driver options --mtu=0               Set the containers network MTU -p, --pidfile=/var/run/docker.pid  Path to use for daemon PID file --registry-mirror=[]         Preferred Docker registry mirror -s, --storage-driver=        Storage driver to use --selinux-enabled=false       Enable selinux support --storage-opt=[]           Set storage driver options --tls=false             Use TLS; implied by --tlsverify --tlscacert=~/.docker/ca.pem     Trust certs signed only by this CA --tlscert=~/.docker/cert.pem     Path to TLS certificate file --tlskey=~/.docker/key.pem      Path to TLS key file --tlsverify=false          Use TLS and verify the remote --userland-proxy=true        Use userland proxy for loopback traffic

sudo systemctl daemon-reload sudo service docker restart