diff --git a/classes/class_cache_redis.php b/classes/class_cache_redis.php
index 7bdad02e..c730d44b 100644
--- a/classes/class_cache_redis.php
+++ b/classes/class_cache_redis.php
@@ -40,7 +40,7 @@ class class_cache_redis {
         if (isset($config['timeout']) && is_numeric($config['timeout'])) {
             $params[] = $config['timeout'];
         }
-        if ($this->isFpmMode()) {
+        if (nexus()->isFpmMode()) {
             try {
                 $connectResult = $redis->pconnect(...$params);
             } catch (\Exception $e) {
@@ -68,11 +68,6 @@ class class_cache_redis {
         return true;
     }
 
-    private function isFpmMode(): bool
-    {
-        return php_sapi_name() === 'fpm-fcgi';
-    }
-
     function getIsEnabled() {
         return $this->isEnabled;
     }
diff --git a/include/core.php b/include/core.php
index e73519d1..ff137ba9 100644
--- a/include/core.php
+++ b/include/core.php
@@ -6,11 +6,15 @@ require_once $rootpath . 'vendor/autoload.php';
 $USERUPDATESET = array();
 $query_name=array();
 \Nexus\Nexus::boot();
-if (!file_exists($rootpath . '.env')) {
-    $installScriptRelativePath = 'install/install.php';
-    $installScriptFile = $rootpath . "public/$installScriptRelativePath";
-    if (file_exists($installScriptFile)) {
-        nexus_redirect($installScriptRelativePath);
+if (nexus()->isFpmMode()) {
+    if (!file_exists($rootpath . '.env')
+        || (getenv('RUNNING_IN_DOCKER') && !file_exists($rootpath . \Nexus\Install\Install::INSTALL_LOCK_FILE))
+    ) {
+        $installScriptRelativePath = 'install/install.php';
+        $installScriptFile = $rootpath . "public/$installScriptRelativePath";
+        if (file_exists($installScriptFile)) {
+            nexus_redirect($installScriptRelativePath);
+        }
     }
 }
 require $rootpath . 'nexus/Database/helpers.php';
diff --git a/nexus/Install/Install.php b/nexus/Install/Install.php
index 3e752dcd..2a930ec7 100644
--- a/nexus/Install/Install.php
+++ b/nexus/Install/Install.php
@@ -49,7 +49,9 @@ class Install
         'pcntl_signal', 'pcntl_alarm', 'pcntl_async_signals'
     ];
 
-    protected string $lockFile = 'install.lock';
+    const INSTALL_LOCK_FILE = 'dont_delete_install.lock';
+
+    protected string $lockFile = self::INSTALL_LOCK_FILE;
 
     public function __construct()
     {
diff --git a/nexus/Nexus.php b/nexus/Nexus.php
index 281b5892..4a01ce41 100644
--- a/nexus/Nexus.php
+++ b/nexus/Nexus.php
@@ -176,6 +176,11 @@ final class Nexus
         return false;
     }
 
+    public function isFpmMode(): bool
+    {
+        return php_sapi_name() === 'fpm-fcgi';
+    }
+
     private function generateRequestId(): string
     {
         $prefix = ($_SERVER['SCRIPT_FILENAME'] ?? '') . implode('', $_SERVER['argv'] ?? []);