# Log inside function in class decorated by deployment does not appear in console
**URL:** https://discuss.ray.io/t/log-inside-function-in-class-decorated-by-deployment-does-not-appear-in-console/22003
**Category:** Ray Serve
**Created:** [March 10, 2025, 11:55am UTC](https://discuss.ray.io/t/log-inside-function-in-class-decorated-by-deployment-does-not-appear-in-console/22003 "2025-03-10T11:55:53Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@town](https://discuss.ray.io/u/town)
#### Post date: [March 10, 2025, 11:55am UTC](https://discuss.ray.io/t/log-inside-function-in-class-decorated-by-deployment-does-not-appear-in-console/22003/1 "2025-03-10T11:55:53Z")
**1. Severity of the issue: (select one)**
High: Completely blocks me.
**2. Environment:**
Ubuntu 22.04.4 LTS
python: 2.12.9
ray: 2.42.1
fastapi: 0.115.8
**3. What happened vs. what you expected:**
- Expected:
- Actual:
### What happened + What you expected to happen
**What happened**
Since all logs are saved in /tmp/ray/logs, it’s difficult to check custom log defined by users.
**log inside process does not appear in conscole.**
**What you expected to happen**
I want to print custom log in terminal and save to single log file, like test.log.
eg: print all following logs in terminal and save them into specified test.log.
```auto
@serve.deployment(num_replicas=2)
class Model1:
def __init__ (self):
logger.info("logger info Model1 init ==================")
logger.warning("logger warning Model1 init ==================")
print("print Model1 init ==================", flush=True)
def process(self, inputs):
logger.info("logger info Model1 process ==================")
logger.warning("logger warning Model1 process ==================")
print("print Model1 process ==================", flush=True)
chunk = "stdout Model1 process =================="
sys.stdout.writelines([chunk])
result = inputs + " __Model1_process__"
return result
```
### Reproduction script
ray start --head
python test.py
```auto
import sys
import logging
import ray
from ray import serve
from fastapi import FastAPI
from pydantic import BaseModel
logger = logging.getLogger("ray.serve")
ray.init(address="auto")
class GenerateRequest(BaseModel):
prompt: str
app = FastAPI()
@serve.deployment(num_replicas=2)
class Model1:
def __init__ (self):
logger.info("logger info Model1 init ==================")
logger.warning("logger warning Model1 init ==================")
print("print Model1 init ==================", flush=True)
def process(self, inputs):
logger.info("logger info Model1 process ==================")
logger.warning("logger warning Model1 process ==================")
print("print Model1 process ==================", flush=True)
chunk = "stdout Model1 process =================="
sys.stdout.writelines([chunk])
result = inputs + " __Model1_process__"
return result
@serve.deployment(num_replicas=2)
class Model2:
def __init__ (self):
pass
def generate(self, inputs):
result = inputs + " __Model2_generate__"
return result
@serve.deployment
@serve.ingress(app)
class Service:
def __init__ (self, preprocessor, llm_actor):
self.preprocessor = preprocessor
self.llm_actor = llm_actor
@app.post("/generate")
async def generate_handler(self, request: GenerateRequest):
processed_prompt = await self.preprocessor.process.remote(request.prompt)
generation_result = await self.llm_actor.generate.remote(processed_prompt)
return {"result": generation_result}
if __name__ == " __main__":
serve.start(detached=True, http_options={"host": "0.0.0.0", "port": 9000})
# Deploy components with dependency injection
preprocessor = Model1.bind()
llm_actor = Model2.bind()
serve_obj = Service.bind(preprocessor, llm_actor)
serve.run(serve_obj,
name="service",
route_prefix="/",
)
```
curl -X POST -H “Content-Type: application/json” -d ‘{“prompt”: “Introduce ray”}’ [http://0.0.0.0:9000/generate](http://0.0.0.0:9000/generate)
---
### Author:  [@rliaw](https://discuss.ray.io/u/rliaw)
#### Post date: [March 10, 2025, 6:49pm UTC](https://discuss.ray.io/t/log-inside-function-in-class-decorated-by-deployment-does-not-appear-in-console/22003/2 "2025-03-10T18:49:53Z")
I believe this is a similar thread as [Logging to stdout for ray serve - #2 by shrekris](https://discuss.ray.io/t/logging-to-stdout-for-ray-serve/8396/2) ?
---
### Author:  [@town](https://discuss.ray.io/u/town)
#### Post date: [March 12, 2025, 6:50am UTC](https://discuss.ray.io/t/log-inside-function-in-class-decorated-by-deployment-does-not-appear-in-console/22003/3 "2025-03-12T06:50:43Z")
Thanks for your help. Well Done! 😀