diff --git a/cmd/moncheck/main.go b/cmd/moncheck/main.go
index 6aa34a5..3bac52e 100644
--- a/cmd/moncheck/main.go
+++ b/cmd/moncheck/main.go
@@ -27,11 +27,12 @@ var (
 
 type (
 	Config struct {
-		DB      string   `json:"db"`
-		Timeout string   `json:"timeout"`
-		Wait    string   `json:"wait"`
-		Path    []string `json:"path"`
-		Workers int      `json:"workers"`
+		DB        string   `json:"db"`
+		Timeout   string   `json:"timeout"`
+		Wait      string   `json:"wait"`
+		Path      []string `json:"path"`
+		Workers   int      `json:"workers"`
+		CheckerID int      `json:"checker_id"`
 	}
 
 	States []int
@@ -73,14 +74,14 @@ func main() {
 	}
 
 	for i := 0; i < config.Workers; i++ {
-		go check(i, db, waitDuration, timeout, hostname)
+		go check(i, db, waitDuration, timeout, hostname, config.CheckerID)
 	}
 	wg := sync.WaitGroup{}
 	wg.Add(1)
 	wg.Wait()
 }
 
-func check(thread int, db *sql.DB, waitDuration, timeout time.Duration, hostname string) {
+func check(thread int, db *sql.DB, waitDuration, timeout time.Duration, hostname string, checker_id int) {
 	for {
 		tx, err := db.Begin()
 		if err != nil {
@@ -91,14 +92,10 @@ func check(thread int, db *sql.DB, waitDuration, timeout time.Duration, hostname
 		from active_checks
 		where next_time < now()
 			and enabled
+			and checker_id = $1
 		order by next_time
 		for update skip locked
-		limit 1;`)
-		if err != nil {
-			log.Printf("[%d] could not start query: %s", thread, err)
-			tx.Rollback()
-			continue
-		}
+		limit 1;`, checker_id)
 		var (
 			id      int64
 			cmdLine []string
diff --git a/cmd/monwork/main.go b/cmd/monwork/main.go
index 81bc347..4271213 100644
--- a/cmd/monwork/main.go
+++ b/cmd/monwork/main.go
@@ -226,13 +226,13 @@ var (
 	where c.last_refresh < c.updated or c.last_refresh is null
   limit 1
 	for update of c skip locked;`
-	SQLRefreshActiveCheck = `insert into active_checks(check_id, cmdline, intval, enabled, msg, mapping_id)
-select c.id, $2, c.intval, c.enabled, case when ac.msg is null then '' else ac.msg end, case when c.mapping_id is not null then c.mapping_id when n.mapping_id is not null then n.mapping_id else 1 end
+	SQLRefreshActiveCheck = `insert into active_checks(check_id, cmdline, intval, enabled, msg, mapping_id, checker_id)
+select c.id, $2, c.intval, c.enabled, case when ac.msg is null then '' else ac.msg end, case when c.mapping_id is not null then c.mapping_id when n.mapping_id is not null then n.mapping_id else 1 end, c.checker_id
 from checks c
 left join active_checks ac on c.id = ac.check_id
 left join nodes n on c.node_id = n.id
 where c.id = $1
 on conflict(check_id)
-do update set cmdline = $2, intval = excluded.intval, enabled = excluded.enabled, mapping_id = excluded.mapping_id;`
+do update set cmdline = $2, intval = excluded.intval, enabled = excluded.enabled, mapping_id = excluded.mapping_id, checker_id = excluded.checker_id;`
 	SQLUpdateLastRefresh = `update checks set last_refresh = now() where id = $1;`
 )
diff --git a/moncheck.conf.example b/moncheck.conf.example
index 6d8a69a..29f5d81 100644
--- a/moncheck.conf.example
+++ b/moncheck.conf.example
@@ -1,5 +1,6 @@
 {
   "db": "user=moncheck dbname=monzero",
+  "checker_id": 1,
   "timeout": "5s",
   "wait": "5s",
   "path": [