diff --git a/conf/conf.go b/conf/conf.go
index f5369d9..f622fc7 100644
--- a/conf/conf.go
+++ b/conf/conf.go
@@ -45,6 +45,7 @@ type Conf struct {
 	Node  string // node 进程路径
 	Proc  string // 当前执行任务路径
 	Cmd   string // cmd 路径
+	Once  string // 马上执行任务路径
 	Group string // 节点分组
 
 	Ttl        int64 // 节点超时时间，单位秒
@@ -158,6 +159,9 @@ func (c *Conf) reload() {
 		return
 	}
 
+	// etcd key 选项需要重启
+	cf.Node, cf.Proc, cf.Cmd, cf.Once, cf.Group = c.Node, c.Proc, c.Cmd, c.Once, c.Group
+
 	*c = *cf
 	log.Noticef("config file[%s] reload success", *confFile)
 	return
diff --git a/conf/files/base.json.sample b/conf/files/base.json.sample
index 6db342a..e095ff9 100644
--- a/conf/files/base.json.sample
+++ b/conf/files/base.json.sample
@@ -3,6 +3,7 @@
     "Node": "/cronsun/node/",
     "Proc": "/cronsun/proc/",
     "Cmd": "/cronsun/cmd/",
+    "Once": "/cronsun/once/",
     "Group": "/cronsun/group/",
     "Ttl": 10,
     "ReqTimeout": 2,
diff --git a/models/job.go b/models/job.go
index c22a366..a27ee23 100644
--- a/models/job.go
+++ b/models/job.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"os/exec"
 	"os/user"
+	"runtime"
 	"strconv"
 	"strings"
 	"syscall"
@@ -247,6 +248,18 @@ func (j *Job) Run() {
 	j.Success(t, b.String())
 }
 
+func (j *Job) RunWithRecovery() {
+	defer func() {
+		if r := recover(); r != nil {
+			const size = 64 << 10
+			buf := make([]byte, size)
+			buf = buf[:runtime.Stack(buf, false)]
+			log.Warnf("panic running job: %v\n%s", r, buf)
+		}
+	}()
+	j.Run()
+}
+
 // 从 etcd 的 key 中取 id
 func GetIDFromKey(key string) string {
 	index := strings.LastIndex(key, "/")
@@ -336,6 +349,22 @@ func (j *Job) Cmds(nid string, gs map[string]*Group) (cmds map[string]*Cmd) {
 	return
 }
 
+func (j Job) IsRunOn(nid string, gs map[string]*Group) bool {
+	for _, r := range j.Rules {
+		for _, id := range r.ExcludeNodeIDs {
+			if nid == id {
+				continue
+			}
+		}
+
+		if r.included(nid, gs) {
+			return true
+		}
+	}
+
+	return false
+}
+
 // 安全选项验证
 func (j *Job) Valid() error {
 	if len(j.cmd) == 0 {
diff --git a/models/once.go b/models/once.go
new file mode 100644
index 0000000..abb6d77
--- /dev/null
+++ b/models/once.go
@@ -0,0 +1,21 @@
+package models
+
+import (
+	client "github.com/coreos/etcd/clientv3"
+
+	"sunteng/cronsun/conf"
+)
+
+// 马上执行 job 任务
+// 注册到 /cronsun/once/group/<jobID>
+// value
+// 若执行单个结点，则值为 NodeID
+// 若 job 所在的结点都需执行，则值为空 ""
+func PutOnce(group, jobID, nodeID string) error {
+	_, err := DefalutClient.Put(conf.Config.Once+group+"/"+jobID, nodeID)
+	return err
+}
+
+func WatchOnce() client.WatchChan {
+	return DefalutClient.Watch(conf.Config.Once, client.WithPrefix())
+}
diff --git a/node/node.go b/node/node.go
index 418ec86..37de034 100644
--- a/node/node.go
+++ b/node/node.go
@@ -389,6 +389,27 @@ func (n *Node) watchGroups() {
 	}
 }
 
+func (n *Node) watchOnce() {
+	rch := models.WatchOnce()
+	for wresp := range rch {
+		for _, ev := range wresp.Events {
+			switch {
+			case ev.IsCreate(), ev.IsModify():
+				if len(ev.Kv.Value) != 0 && string(ev.Kv.Value) != n.ID {
+					continue
+				}
+
+				job, ok := n.jobs[models.GetIDFromKey(string(ev.Kv.Key))]
+				if !ok || job.IsRunOn(n.ID, n.groups) {
+					continue
+				}
+
+				go job.RunWithRecovery()
+			}
+		}
+	}
+}
+
 // 启动服务
 func (n *Node) Run() (err error) {
 	go n.keepAlive()