docker: properly launch docker logger process

command/docker_logger_plugin.go

@@ -0,0 +1,36 @@
+package command
+
+import (
+	"strings"
+
+	hclog "github.com/hashicorp/go-hclog"
+	plugin "github.com/hashicorp/go-plugin"
+	"github.com/hashicorp/nomad/drivers/docker/docklog"
+	"github.com/hashicorp/nomad/plugins/base"
+)
+
+type DockerLoggerPluginCommand struct {
+	Meta
+}
+
+func (e *DockerLoggerPluginCommand) Help() string {
+	helpText := `
+	This is a command used by Nomad internally to launch the docker logger process"
+	`
+	return strings.TrimSpace(helpText)
+}
+
+func (e *DockerLoggerPluginCommand) Synopsis() string {
+	return "internal - launch a docker logger plugin"
+}
+
+func (e *DockerLoggerPluginCommand) Run(args []string) int {
+	plugin.Serve(&plugin.ServeConfig{
+		HandshakeConfig: base.Handshake,
+		Plugins: map[string]plugin.Plugin{
+			docklog.PluginName: docklog.NewPlugin(docklog.NewDockerLogger(hclog.Default().Named(docklog.PluginName))),
+		},
+		GRPCServer: plugin.DefaultGRPCServer,
+	})
+	return 0
+}