diff --git a/infrastructure/checker/.env.template b/infrastructure/checker/.env.template
index 7c6f9d3..696fced 100644
--- a/infrastructure/checker/.env.template
+++ b/infrastructure/checker/.env.template
@@ -1,2 +1,2 @@
 REGISTRY_LOGIN=devitq
-REGISTRY_PASSWORD=14zQrbzDTM0WXK@CogMQikAvP74Rj4
+REGISTRY_PASSWORD=prod-zAoUDyHwkgRfQPyVvskH
diff --git a/services/checker/.env.template b/services/checker/.env.template
new file mode 100644
index 0000000..8bea4d3
--- /dev/null
+++ b/services/checker/.env.template
@@ -0,0 +1,10 @@
+# Change all vars before going to production and remove all comments (!)
+# Below all environment variables and default values
+
+REGISTRY_USERNAME=
+
+REGISTRY_PASSWORD=
+
+REGISTRY_URL=gitlab.prodcontest.ru:5050
+
+DOCKER_IMAGE=gitlab.prodcontest.ru:5050/team-15/project/custom-python
diff --git a/services/checker/config.py b/services/checker/config.py
index b297cc8..7c49c2f 100644
--- a/services/checker/config.py
+++ b/services/checker/config.py
@@ -14,5 +14,5 @@ REGISTRY_PASSWORD = os.getenv("REGISTRY_USERNAME", None)
 REGISTRY_URL = os.getenv("REGISTRY_URL", "gitlab.prodcontest.ru:5050")
 
 DOCKER_IMAGE = os.getenv(
-    "IMAGE", default="gitlab.prodcontest.ru:5050/team-15/project/custom-python"
+    "DOCKER_IMAGE", default="gitlab.prodcontest.ru:5050/team-15/project/custom-python"
 )
diff --git a/services/checker/main.py b/services/checker/main.py
index bd10819..c352bbc 100644
--- a/services/checker/main.py
+++ b/services/checker/main.py
@@ -1,5 +1,6 @@
+import docker.errors
 from fastapi import FastAPI, HTTPException, status
-from pydantic import BaseModel, Field, HttpUrl, constr
+from pydantic import BaseModel, Field, HttpUrl
 import aiohttp
 import asyncio
 import docker
@@ -20,13 +21,24 @@ ALLOWED_FILENAME_CHARS = r"[^a-zA-Z0-9_\-.]"
 
 app = FastAPI()
 docker_client = docker.from_env()
-logger = logging.getLogger(__name__)
-logging.basicConfig(level=logging.INFO)
 docker_client.login(
     username=config.REGISTRY_LOGIN,
     password=config.REGISTRY_PASSWORD,
     registry=config.REGISTRY_URL,
 )
+logger = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO)
+
+
+@app.on_event("startup")
+async def pull_docker_image():
+    client = docker.from_env()
+    image_name = config.DOCKER_IMAGE
+    try:
+        client.images.pull(image_name)
+        print(f"Successfully pulled {image_name}")
+    except docker.errors.DockerException as e:
+        print(f"Error pulling {image_name}: {e}")
 
 
 class FileDetails(BaseModel):
@@ -93,9 +105,7 @@ async def download_file(
     session: aiohttp.ClientSession, url: str, dest_path: str
 ) -> None:
     try:
-        async with session.get(
-            url, timeout=aiohttp.ClientTimeout(total=30)
-        ) as resp:
+        async with session.get(url, timeout=aiohttp.ClientTimeout(total=30)) as resp:
             if resp.status != 200:
                 raise HTTPException(
                     status_code=status.HTTP_400_BAD_REQUEST,
@@ -276,9 +286,7 @@ async def execute_code(request: ExecutionRequest) -> ExecutionResponse:
         return ExecutionResponse(
             success=success,
             hash_match=(
-                result_hash == request.expected_hash
-                if request.expected_hash
-                else None
+                result_hash == request.expected_hash if request.expected_hash else None
             ),
             output=output[:5000],
             result_hash=result_hash,