CODEWITHSUNDEEP
dockernginx
kumar
kumar

Reputation: 9417

In Nginx docker how do we see log only from error.log

Nginx Docker file is configured to send error.log to /dev/stderr. 

RUN ln -sf /dev/stdout /var/log/nginx/access.log 
    && ln -sf /dev/stderr /var/log/nginx/error.log

When we run docker logs --tail=10 -f nginx it show a combination of both error log and access log. Is there a docker command so I can only see the logs of error.log or stderr?

Upvotes: 14

Views: 52435

Answers (2)

james
james

Reputation: 899

From the Dockerfile snippet you added in your question, it looks like you are using the official NGINX image.

The NGINX image is configured to send the main NGINX access and error logs to the Docker log collector by default. This is done by linking them to stdout and stderr, which causes all messages from both logs to be stored in the file/var/lib/docker/containers/\/\-json.log on the Docker Host.

One method is to use the docker API.

You can enable the docker API and query the logs that way, in /etc/default/docker:

DOCKEROPTS='-H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock'

Then:

http://<docker host>:4243/containers/<container name>/logs?stderr=1

See:

https://www.docker.com/blog/tips-for-deploying-nginx-official-image-with-docker/

Upvotes: 0

AttaBoy
AttaBoy

Reputation: 436

Try this command to get only error.log:

docker logs -f nginx 1>/dev/null

And this one for access.log:

docker logs -f nginx 2>/dev/null

Upvotes: 39

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