To illustrate cluster operations better, let's take a look at an example made up of three managers and ten workers. The first basic operation is listing nodes, with docker node ls
command:
You can reference to the nodes by calling them either by their hostname (manager1) or by their ID (ctv03nq6cjmbkc4v1tc644fsi). The other columns in this list statement describes the properties of the cluster nodes.
STATUS is about the physical reachability of the node. If the node is up, it's Ready, otherwise it's Down.
AVAILABILITY is the node availability. A node state can either be Active (participating in the cluster operations), Pause (in standby, suspended, not accepting tasks), or Drain (waiting to be evacuated its tasks).
MANAGER STATUS is the current status of manager. If a node is not the manager, this field will be empty. If a node is manager, this field can either be Reachable (one of the managers present to guarantee high availability) or Leader (the host leading all operations...