Enable json logs

command/agent/agent.go

@@ -99,7 +99,7 @@ func NewAgent(config *Config, logOutput io.Writer, inmem *metrics.InmemSink) (*A
 		Name:       "agent",
 		Level:      log.LevelFromString(config.LogLevel),
 		Output:     logOutput,
-		JSONFormat: false, // TODO(alex,hclog) Add a config option
+		JSONFormat: config.LogJson,
 	})
 	a.httpLogger = a.logger.ResetNamed("http")
 

command/agent/command.go

@@ -109,6 +109,7 @@ func (c *Command) readConfig() *Config {
 	flags.StringVar(&cmdConfig.PluginDir, "plugin-dir", "", "")
 	flags.StringVar(&cmdConfig.Datacenter, "dc", "", "")
 	flags.StringVar(&cmdConfig.LogLevel, "log-level", "", "")
+	flags.BoolVar(&cmdConfig.LogJson, "log-json", false, "")
 	flags.StringVar(&cmdConfig.NodeName, "node", "", "")
 
 	// Consul options
@@ -494,6 +495,7 @@ func (c *Command) AutocompleteFlags() complete.Flags {
 		"-plugin-dir":                    complete.PredictDirs("*"),
 		"-dc":                            complete.PredictAnything,
 		"-log-level":                     complete.PredictAnything,
+		"-json-logs":                     complete.PredictNothing,
 		"-node":                          complete.PredictAnything,
 		"-consul-auth":                   complete.PredictAnything,
 		"-consul-auto-advertise":         complete.PredictNothing,
@@ -1127,6 +1129,9 @@ General Options (clients and servers):
     DEBUG, INFO, and WARN, in decreasing order of verbosity. The
     default is INFO.
 
+  -log-json
+    Output logs in a JSON format. The default is false.
+
   -node=<name>
     The name of the local agent. This name is used to identify the node
     in the cluster. The name must be unique per region. The default is

command/agent/config-test-fixtures/basic.hcl

@@ -4,6 +4,7 @@ name = "my-web"
 data_dir = "/tmp/nomad"
 plugin_dir = "/tmp/nomad-plugins"
 log_level = "ERR"
+log_json = true
 bind_addr = "192.168.0.1"
 enable_debug = true
 ports {

command/agent/config.go

@@ -43,6 +43,9 @@ type Config struct {
 	// LogLevel is the level of the logs to put out
 	LogLevel string `mapstructure:"log_level"`
 
+	// LogJson enables log output in a JSON format
+	LogJson bool `mapstructure:"log_json"`
+
 	// BindAddr is the address on which all of nomad's services will
 	// be bound. If not specified, this defaults to 127.0.0.1.
 	BindAddr string `mapstructure:"bind_addr"`
@@ -722,6 +725,9 @@ func (c *Config) Merge(b *Config) *Config {
 	if b.LogLevel != "" {
 		result.LogLevel = b.LogLevel
 	}
+	if b.LogJson {
+		result.LogJson = true
+	}
 	if b.BindAddr != "" {
 		result.BindAddr = b.BindAddr
 	}

command/agent/config_parse.go

@@ -9,7 +9,7 @@ import (
 	"time"
 
 	multierror "github.com/hashicorp/go-multierror"
-	"github.com/hashicorp/go-version"
+	version "github.com/hashicorp/go-version"
 	"github.com/hashicorp/hcl"
 	"github.com/hashicorp/hcl/hcl/ast"
 	"github.com/hashicorp/nomad/helper"
@@ -80,6 +80,7 @@ func parseConfig(result *Config, list *ast.ObjectList) error {
 		"data_dir",
 		"plugin_dir",
 		"log_level",
+		"log_json",
 		"bind_addr",
 		"enable_debug",
 		"ports",

command/agent/config_parse_test.go

@@ -26,6 +26,7 @@ func TestConfig_Parse(t *testing.T) {
 				DataDir:     "/tmp/nomad",
 				PluginDir:   "/tmp/nomad-plugins",
 				LogLevel:    "ERR",
+				LogJson:     true,
 				BindAddr:    "192.168.0.1",
 				EnableDebug: true,
 				Ports: &Ports{

command/agent/config_test.go

@@ -47,6 +47,7 @@ func TestConfig_Merge(t *testing.T) {
 		DataDir:                   "/tmp/dir1",
 		PluginDir:                 "/tmp/pluginDir1",
 		LogLevel:                  "INFO",
+		LogJson:                   false,
 		EnableDebug:               false,
 		LeaveOnInt:                false,
 		LeaveOnTerm:               false,
@@ -193,6 +194,7 @@ func TestConfig_Merge(t *testing.T) {
 		DataDir:                   "/tmp/dir2",
 		PluginDir:                 "/tmp/pluginDir2",
 		LogLevel:                  "DEBUG",
+		LogJson:                   true,
 		EnableDebug:               true,
 		LeaveOnInt:                true,
 		LeaveOnTerm:               true,

website/source/docs/commands/agent.html.md.erb

@@ -59,7 +59,8 @@ via CLI arguments. The `agent` command accepts the following arguments:
 * `-encrypt`: Set the Serf encryption key. See the [Encryption Overview](/guides/security/encryption.html) for more details.
 * `-join=<address>`: Address of another agent to join upon starting up. This can
   be specified multiple times to specify multiple agents to join.
-* `-log-level=<level>`: Equivalent to the [log_level](#log_level) config option.
+* `-log-level=<level>`: Equivalent to the [log_level](/docs/configuration/index.html#log_level) config option.
+* `-log-json`: Equivalent to the [log_json](/docs/configuration/index.html#log_json) config option.
 * `-meta=<key=value>`: Equivalent to the Client [meta](#meta) config option.
 * `-network-interface=<interface>`: Equivalent to the Client
    [network_interface](#network_interface) config option.

website/source/docs/configuration/index.html.md

@@ -172,6 +172,8 @@ testing.
   agent will output. Valid log levels include `WARN`, `INFO`, or `DEBUG` in
   increasing order of verbosity.
 
+- `log_json` `(bool: false)` - Output logs in a JSON format.
+
 - `name` `(string: [hostname])` - Specifies the name of the local node. This
   value is used to identify individual agents. When specified on a server, the
   name must be unique within the region.