Docker volume invest host to machine - docker

How can I copy files that are inside the container so I can edit them?
services:
web:
image: jitsi/web
restart: ${RESTART_POLICY}
ports:
- '${HTTP_PORT}:80'
- '${HTTPS_PORT}:443'
volumes:
- ${CONFIG}/web:/config
- ${CONFIG}/web/letsencrypt:/etc/letsencrypt
- ${CONFIG}/transcripts:/usr/share/jitsi-meet/transcripts
I want to access the files in the directory /usr/share/jitsi-meet/transcripts within the container:
base.html connection_optimization favicon.ico head.html index.htmllibs package-lock.json plugin.head.html scripts static transcripts
root#cb7d87c5635f:/usr/share/jitsi-meet#

You can use docker cp command:
sudo docker cp <containerId>:/path/in/container /path/in/host/
And with the same command, you can copy files backwards from the host machine to the Docker container.

Related

How do I share a docker-compose volume with a linux host?

I have a docker-compose.yml
version: '3.3'
services:
ssh:
environment:
- TZ=Etc/UTC
- DEBIAN_FRONTEND=noninterative
build:
context: './'
dockerfile: Dockerfile
ports:
- '172.17.0.2:22:22'
- '443:443'
- '8025:8025'
volumes:
- srv:/srv:rw
restart: always
volumes:
srv:
After I run docker-compose up --build I can ssh to the docker vm and there are files in /srv. 'docker volume ls' shows 2 volumes, srv and dockersetupsrv. They are both in /var/lib/docker/volumes. They both contain _data directories and show creation time stamps that match the docker image creation times but are otherwise empty. Neither one contains any of the files that are in the docker container's /srv directory. How can I share the docker /srv directory with the host?
you should point out more specific for the mapping directory,
for example:
/srv:/usr/srv:rw
after that, when you add content inside your host machine /srv,it is automatically map into /usr/srv
--> make sure that directory exist
you can have a check in this link : https://docs.docker.com/storage/volumes/

How bind properly container's content to host folder?

I'm tring to bind container's content to host folder, so that i can easy edit it, but for some reason it doesn't work!
here my docker-compose file:
version: "3"
services:
webserver:
image: nginx:mainline-alpine
container_name: webserver
restart: unless-stopped
ports:
- "80:80"
volumes:
- ./config:/etc/nginx/conf.d
Please note that this is my folder structure before the docker-compose command:
-project
--docker-compose.yaml
Thank you in advance
Mounting a folder from the container on the host is not possible.
To achieve what you want consider the following
First launch the container without any volumes defined
Run docker cp webserver:/etc/nginx/conf.d/. ./config to copy the content of /etc/nginx/conf.d/ to your config folder on the host
Kill the container and relaunch it with the config folder mounted on /etc/nginx/conf.d (like in your original example). This will shadow the nginx config in the container with the one on your local machine
When editing the local files it will reflect in the container.
If you want to persist your changes in the image after you are done, create a new Docker image by building the following Dockerfile
FROM nginx:mainline-alpine
COPY ./config/* /etc/nginx/conf.d/

Docker keeps data but creates a new volume from host folder every "run"

It seems to be a misunderstood point from me about volumes. I have a docker-compose file with two services : jobs which is a Flask api built from a Dockerfile (see below), and mongo which is from official MongoDb image.
I have two volumes : - .:/code is linked from my host working directory to /code folder in the container, and a named volume mongodata.
version: "3"
services:
jobs:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
environment:
FLASK_ENV: ${FLASK_ENV}
FLASK_APP: ${FLASK_APP}
depends_on:
- mongo
mongo:
image: "mongo:3.6.21-xenial"
restart: "always"
ports:
- "27017:27017"
volumes:
- mongodata:/data/db
environment:
MONGO_INITDB_ROOT_USERNAME: ${MONGO_INITDB_ROOT_USERNAME}
MONGO_INITDB_ROOT_PASSWORD: ${MONGO_INITDB_ROOT_PASSWORD}
volumes:
mongodata:
Dockerfile for jobs service :
FROM python:3.7-alpine
WORKDIR /code
ENV FLASK_APP=job-checker
ENV FLASK_ENV=development
COPY requirements.txt requirements.txt
RUN pip install -r requirements.txt
EXPOSE 5000
COPY . .
CMD ["flask", "run", "--host=0.0.0.0"]
Every time I remove these container and re-run, everything is fine, I still have my data in mongodata volume. But when I check the volume list I can see that a new volume is created from - .:/code with a long volume name, for example :
$ docker volume ls
DRIVER VOLUME NAME
local 55c08cd008a1ed1af8345cef01247cbbb29a0fca9385f78859607c2a751a0053
local abe9fd0c415ccf7bf8c77346f31c146e0c1feeac58b3e0e242488a155f6a3927
local job-checker_mongodata
Here I ran docker-compose up, then I removed containers, then ran up again, so I have two volumes from my working folder.
Is this normal that every up create a new volume instead of using the previous one ?
Thanks
Hidden at the end of the Docker Hub mongo image documentation is a note:
This image also defines a volume for /data/configdb...
The image's Dockerfile in turn contains the line
VOLUME /data/db /data/configdb
When you start the container, you mount your own volume over /data/db, but you don't mount anything on the second path. This causes Docker to create an anonymous volume there, which is the volume you're seeing with only a long hex ID.
It should be safe to remove the extra volumes, especially if you're sure they're not attached to a container and they don't have interesting content.
This behavior has nothing to do with the bind mount in the other container; bind mounts never show up in the docker volume ls listing at all.

Docker-compose volume starting empty in container

I have the following docker-compose.yml configuration:
version: '3'
services:
proxy:
image: nginx:latest
container_name: webproxy
ports:
- "80:80"
volumes:
- /etc/nginx/sites-available:/etc/nginx/sites-available
On my host machine I have a nginx.conf file at /etc/nginx/sites-available/nginx.conf.
Steps:
Start the container with docker-compose -up
Go into the command line of the container with sudo docker exec -it 687 /bin/bash
cd into /etc/nginx/sites-available
Unfortunately the folder in step 3 is empty. My nginx.conf file is not being copied.
Is my docker-compose file not configured properly, or are volumes not supposed to also copy and start with the host data?
Doesn't looks anything wrong in docker-compose.yaml , because I used the same file as mentioned by you to create docker container. It worked for me. check your content inside /etc/nginx/sites-available on your host machine.

Files inside Docker container not updating when I edit in host

I am using Docker which is running fine.
I can start a Docker image using docker-compose.
docker-compose rm nodejs; docker-compose rm db; docker-compose up --build
I attached a shell to the Docker container using
docker exec -it nodejs_nodejs_1 bash
I can view files inside the container
(inside container)
cat server.js
Now when I edit the server.js file inside the host, I would like the file inside the container to change without having to restart Docker.
I have tried to add volumes to the docker-compose.yml file or to the Dockerfile, but somehow I cannot get it to work.
(Dockerfile, not working)
FROM node:10
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
VOLUMES ["/usr/src/app"]
EXPOSE 8080
CMD [ "npm", "run", "watch" ]
or
(docker-compose.yml, not working)
version: "3.3"
services:
nodejs:
build: ./nodejs-server
ports:
- "8001:8080"
links:
- db:db
env_file:
- ./.env-example
volumes:
- src: /usr/src/app
db:
build: ./mysql-server
volumes:
- ./mysql-server/data:/docker-entrypoint-initdb.d #A folder /mysql-server/data with a .sql file needs to exist
env_file:
- ./.env-example
volumes:
src:
There is probably a simple guide somewhere, but I havn't found it yet.
If you want a copy of the files to be visible in the container, use a bind mount volume (aka host volume) instead of a named volume.
Assuming your docker-compose.yml file is in the root directory of the location that you want in /usr/src/app, then you can change your docker-compose.yml as follows:
version: "3.3"
services:
nodejs:
build: ./nodejs-server
ports:
- "8001:8080"
links:
- db:db
env_file:
- ./.env-example
volumes:
- .:/usr/src/app
db:
build: ./mysql-server
volumes:
- ./mysql-server/data:/docker-entrypoint-initdb.d #A folder /mysql-server/data with a .sql file needs to exist
env_file:
- ./.env-example

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