Lookup Keys for Formatted Output

gistfile1.txt

# docker info is great for users to read, but takes work to parse in a script
$ docker info
Containers: 9 
 Running: 4   
 Paused: 0    
 Stopped: 5   
 ...
Swarm: active 
 NodeID: xxx
 Is Manager: true   
 ClusterID: xxx
 Managers: 1                           
 Nodes: 1                              
 Orchestration:                        
  Task History Retention Limit: 5      
 Raft:                                 
  Snapshot Interval: 10000             
  Number of Old Snapshots to Retain: 0 
  Heartbeat Tick: 1   
  Election Tick: 3    
 Dispatcher:          
  Heartbeat Period: 5 seconds
 CA Configuration: 
  Expiry Duration: 3 months
  Force Rotate: 4
 Autolock Managers: false
 Root Rotation In Progress: false
 Node Address: 192.168.1.1
 Manager Addresses:
  xxx:2377
  
# First, format everything as json, and pipe through jq to make it user readable
$ docker info -f '{{ json . }}' | jq .
{
  "ID": "xxx",
  "Containers": 9,
  "ContainersRunning": 4,
  "ContainersPaused": 0,
  "ContainersStopped": 5,
  "Driver": "overlay2",
  ...
  "Swarm": {
    "NodeID": "xxx",
    "NodeAddr": "192.168.1.1",
    "LocalNodeState": "active",
    "ControlAvailable": true,
    "Error": "",
    "RemoteManagers": [
      {
        "NodeID": "xxxx",
        "Addr": "192.168.1.1:2377"
      }
    ],
    "Nodes": 1,
    "Managers": 1,
    "Cluster": {
      "ID": "xxx",
      "Version": {
        "Index": 6270
      },

# Now you know the key to lookup with formatted output
$ docker info -f '{{ .Swarm.LocalNodeState }}'
active

# For arrays, use index
$ docker info -f '{{ (index .Swarm.RemoteManagers 0).Addr }}'
192.168.1.1:2377