CODEWITHSUNDEEP
loggingdockervolumes
krckumar
krckumar

Reputation: 544

Sharing data across containers

I have a docker container which is running an application server. The application logs are generated and stored in a particular directory. In my scenario, there are multiple log files and traces generated and stored in that location.

I can understand that there are multiple ways to access those logs - such as 

docker exec -it <container_id> bash
ssh into the container (when the keys are set while creating the container)

Apart from the above two examples, I would like to access the logs through a different container (which is running an nginx webserver). Theoretically I can understand that with the concept of using "--volumes-from" while creating the docker container for the app server (the first container) we can acheieve, but I dont know how to get it working.

My requirement is whenever the log is generated, it should be served via the other container's webserver. Is there a way we can see the directory listing of the entire logs directory (through Volumes ???) like a directory listing.

I tried something like this and its not working as expected

docker run --name=log_webserver -p 80 --volumes-from logvol:/website_files nginx

docker run --name appcontainer -m 1024 -p 9080 -v sysvol:/var/log/rsyslog -v logvol:/opt/servers/simpleappserver/logs krckumar/simpleappserver

Any other ways to expose the logs ? please suggest.

Upvotes: 1

Views: 78

Answers (1)

danday74
danday74

Reputation: 57185

docker run --name container1 -v /website_files
docker run --name container2 --volumes_from container1

to expose logs do ....

docker logs -f container1

this works if you tail -f the logs in your ENTRYPOINT script - tail -f also prevents container exit since docker is process centric. since tail -f never ends, so your container will never exit. so you can investigate whats going on inside with 

docker exec -it container1 bash

any more questions plz ask.

PS if using multiple containers you might want to consider using docker-compose which is v easy to learn and based totally on docker commands itself.

Upvotes: 2

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