set up cli config parsing

Author: tehut

command/agent/agent.go

@@ -777,6 +777,9 @@ func convertClientConfig(agentConfig *Config) (*clientconfig.Config, error) {
 	if agentConfig.Client.NetworkInterface != "" {
 		conf.NetworkInterface = agentConfig.Client.NetworkInterface
 	}
+	if agentConfig.Client.NodeMaxAllocs != 0 {
+		conf.NodeMaxAllocs = &structs.NodeMaxAllocs{MaxAllocs: agentConfig.Client.NodeMaxAllocs}
+	}
 
 	// handle rpc yamux configuration
 	conf.RPCSessionConfig = yamux.DefaultConfig()

command/agent/config.go

@@ -414,6 +414,10 @@ type ClientConfig struct {
 
 	// ExtraKeysHCL is used by hcl to surface unexpected keys
 	ExtraKeysHCL []string `hcl:",unusedKeys" json:"-"`
+
+	// NodeMaxAllocs sets the maximum number of allocations per node
+	// Defaults to 0 and ignored if unset.
+	NodeMaxAllocs int `hcl:"node_max_allocs"`
 }
 
 func (c *ClientConfig) Copy() *ClientConfig {

command/agent/config_parse_test.go

@@ -693,7 +693,10 @@ var sample0 = &Config{
 		RPC:  "host.example.com",
 		Serf: "host.example.com",
 	},
-	Client: &ClientConfig{ServerJoin: &ServerJoin{}},
+	Client: &ClientConfig{
+		ServerJoin:    &ServerJoin{},
+		NodeMaxAllocs: 5,
+	},
 	Server: &ServerConfig{
 		Enabled:         true,
 		BootstrapExpect: 3,

command/agent/testdata/sample0.json

@@ -45,6 +45,9 @@
     "client_auto_join": false,
     "token": "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"
   },
+  "client": {
+    "node_max_allocs": 5
+  },
   "data_dir": "/opt/data/nomad/data",
   "datacenter": "dc1",
   "enable_syslog": true,