Merge pull request #16229 from icecrime/discovery

Add builtin nodes discovery

docs/reference/api/docker_remote_api_v1.21.md

@@ -1821,6 +1821,7 @@ Display system-wide information
         "CpuCfsPeriod": true,
         "CpuCfsQuota": true,
         "Debug": false,
+        "DiscoveryBackend": "etcd://localhost:2379",
         "DockerRootDir": "/var/lib/docker",
         "Driver": "btrfs",
         "DriverStatus": [[""]],

docs/reference/commandline/daemon.md

@@ -22,6 +22,8 @@ weight=1
       -D, --debug=false                      Enable debug mode
       --default-gateway=""                   Container default gateway IPv4 address
       --default-gateway-v6=""                Container default gateway IPv6 address
+      --cluster-store=""                     URL of the distributed storage backend
+      --cluster-advertise=""                 Address of the daemon instance to advertise
       --dns=[]                               DNS server to use
       --dns-opt=[]                           DNS options to use
       --dns-search=[]                        DNS search domains to use
@@ -484,6 +486,12 @@ Be careful setting `nproc` with the `ulimit` flag as `nproc` is designed by Linu
 set the maximum number of processes available to a user, not to a container. For details
 please check the [run](run.md) reference.
 
+## Nodes discovery
+
+`--cluster-advertise` specifies the 'host:port' combination that this particular
+daemon instance should use when advertising itself to the cluster. The daemon
+should be reachable by remote hosts on this 'host:port' combination.
+
 ## Miscellaneous options
 
 IP masquerading uses address translation to allow containers without a public