diff --git a/trunk/conf/full.conf b/trunk/conf/full.conf
index 80aadb53e..8bf44582b 100644
--- a/trunk/conf/full.conf
+++ b/trunk/conf/full.conf
@@ -77,6 +77,10 @@ asprocess off;
 # default: on
 empty_ip_ok on;
 
+# Whether in docker. When SRS starting, it will detect the docker, however
+# it might detect failed, then read this config.
+# Default: off
+in_docker off;
 # For gracefully quit, wait for a while then close listeners,
 # because K8S notify SRS with SIGQUIT and update Service simultaneously,
 # maybe there is some new connections incoming before Service updated.
diff --git a/trunk/doc/CHANGELOG.md b/trunk/doc/CHANGELOG.md
index f8dd26861..20c20b217 100644
--- a/trunk/doc/CHANGELOG.md
+++ b/trunk/doc/CHANGELOG.md
@@ -8,6 +8,7 @@ The changelog for SRS.
 
 ## SRS 4.0 Changelog
 
+* v4.0, 2021-01-03, For [#2824](https://github.com/ossrs/srs/issues/2824): Support config in_docker to fix the detect fail. (#2824). v4.0.216
 * v4.0, 2021-12-31, For [#2728](https://github.com/ossrs/srs/issues/2728): Refine error log for rtmp2rtc. (#2728). v4.0.215
 * v4.0, 2021-12-29, Merge [#2770](https://github.com/ossrs/srs/pull/2770), [#2820](https://github.com/ossrs/srs/pull/2820): Bugs fixed. (#2770)(#2820). v4.0.214
 * v4.0, 2021-12-27, Fix [#2811](https://github.com/ossrs/srs/issues/2811): Fix ulimit issue by detecting epoll on Ubuntu. (#2811). v4.0.213
diff --git a/trunk/src/app/srs_app_config.cpp b/trunk/src/app/srs_app_config.cpp
index fa813737c..d6ea94634 100644
--- a/trunk/src/app/srs_app_config.cpp
+++ b/trunk/src/app/srs_app_config.cpp
@@ -2471,7 +2471,7 @@ srs_error_t SrsConfig::check_normal_config()
             && n != "grace_start_wait" && n != "empty_ip_ok" && n != "disable_daemon_for_docker"
             && n != "inotify_auto_reload" && n != "auto_reload_for_docker" && n != "tcmalloc_release_rate"
             && n != "query_latest_version"
-            && n != "circuit_breaker" && n != "is_full"
+            && n != "circuit_breaker" && n != "is_full" && n != "in_docker"
             ) {
             return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal directive %s", n.c_str());
         }
@@ -2999,6 +2999,18 @@ bool SrsConfig::get_daemon()
     return SRS_CONF_PERFER_TRUE(conf->arg0());
 }
 
+bool SrsConfig::get_in_docker()
+{
+    static bool DEFAULT = false;
+
+    SrsConfDirective* conf = root->get("in_docker");
+    if (!conf) {
+        return DEFAULT;
+    }
+
+    return SRS_CONF_PERFER_FALSE(conf->arg0());
+}
+
 bool SrsConfig::is_full_config()
 {
     static bool DEFAULT = false;
diff --git a/trunk/src/app/srs_app_config.hpp b/trunk/src/app/srs_app_config.hpp
index c62351c87..51510b5df 100644
--- a/trunk/src/app/srs_app_config.hpp
+++ b/trunk/src/app/srs_app_config.hpp
@@ -382,6 +382,8 @@ public:
     // If  true, SRS will run in daemon mode, fork and fork to reap the
     // grand-child process to init process.
     virtual bool get_daemon();
+    // Whether srs in docker.
+    virtual bool get_in_docker();
 private:
     // Whether user use full.conf
     virtual bool is_full_config();
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index 2d2a72872..34e6eed6c 100644
--- a/trunk/src/core/srs_core_version4.hpp
+++ b/trunk/src/core/srs_core_version4.hpp
@@ -9,6 +9,6 @@
 
 #define VERSION_MAJOR       4
 #define VERSION_MINOR       0
-#define VERSION_REVISION    215
+#define VERSION_REVISION    216
 
 #endif
diff --git a/trunk/src/main/srs_main_server.cpp b/trunk/src/main/srs_main_server.cpp
index 643ad83d4..46465c62d 100644
--- a/trunk/src/main/srs_main_server.cpp
+++ b/trunk/src/main/srs_main_server.cpp
@@ -385,6 +385,14 @@ srs_error_t run_directly_or_daemon()
 {
     srs_error_t err = srs_success;
 
+    // Try to load the config if docker detect failed.
+    if (!_srs_in_docker) {
+        _srs_in_docker = _srs_config->get_in_docker();
+        if (_srs_in_docker) {
+            srs_trace("enable in_docker by config");
+        }
+    }
+
     // Load daemon from config, disable it for docker.
     // @see https://github.com/ossrs/srs/issues/1594
     bool run_as_daemon = _srs_config->get_daemon();