Optimize out of memory handling logic

- Use oom_score_adj value -250 for user docker
- Use oom_score_adj for console container

config/docker_config.go

@@ -11,6 +11,12 @@ func (d *DockerConfig) FullArgs() []string {
 	args := []string{}
 	args = append(args, generateEngineOptsSlice(d.EngineOpts)...)
 	args = append(args, d.ExtraArgs...)
+
+	// Make sure that OOM killer will kill containers before user docker
+	// https://github.com/burmilla/os/issues/33
+	args = append(args, "--oom-score-adjust")
+	args = append(args, "-250")
+
 	if d.TLS {
 		args = append(args, d.TLSArgs...)
 	}

os-config.tpl.yml

@@ -251,6 +251,7 @@ rancher:
       pid: host
       ipc: host
       privileged: true
+      oom_score_adj: -100
       restart: always
       volumes_from:
       - all-volumes