What is the impact on not using volumes in my docker-compose?
I am new to docker, what a wonderful tool!. Following the Django tutorial, their docs provide a basic docker-compose.yml, that looks similar to the following one that I've created.
version: '3'
services:
web:
build: .
container_name: web
command: python manage.py migrate
command: python manage.py runserver 0.0.0.0:8000
volumes:
- ./src:/src
ports:
- "8000:8000"
depends_on:
- postgres
postgres:
image: postgres:latest
container_name: postgres
environment:
POSTGRES_USER: my_user
POSTGRES_PASSWORD: my_secret_pass!
POSTGRES_DB: my_db
ports:
- "5432:5432"
However, in every single docker-compose file that I see around, the following is added:
volumes:
- ./postgres-data:/var/lib/postgresql/data
What are those volumes used for? Does it mean that if I now restart my postgres container all my data is deleted, but if I had the volumes it is not?
Is my docker-compose.yml ready for production?
docker docker-compose
asked Nov 28 '18 at 23:11
DalvtorDalvtor
850722
add a comment |
I am new to docker, what a wonderful tool!. Following the Django tutorial, their docs provide a basic docker-compose.yml, that looks similar to the following one that I've created.
version: '3'
services:
web:
build: .
container_name: web
command: python manage.py migrate
command: python manage.py runserver 0.0.0.0:8000
volumes:
- ./src:/src
ports:
- "8000:8000"
depends_on:
- postgres
postgres:
image: postgres:latest
container_name: postgres
environment:
POSTGRES_USER: my_user
POSTGRES_PASSWORD: my_secret_pass!
POSTGRES_DB: my_db
ports:
- "5432:5432"
However, in every single docker-compose file that I see around, the following is added:
volumes:
- ./postgres-data:/var/lib/postgresql/data
What are those volumes used for? Does it mean that if I now restart my postgres container all my data is deleted, but if I had the volumes it is not?
Is my docker-compose.yml ready for production?
docker docker-compose
asked Nov 28 '18 at 23:11
DalvtorDalvtor
850722
2
Basically yes, if youdocker-compose downthen the containers are removed and if there is data inside, it is also destroyed. Using volume mount helps it persist between container instances.
– Dan Lowe
Nov 28 '18 at 23:12
add a comment |
I am new to docker, what a wonderful tool!. Following the Django tutorial, their docs provide a basic docker-compose.yml, that looks similar to the following one that I've created.
version: '3'
services:
web:
build: .
container_name: web
command: python manage.py migrate
command: python manage.py runserver 0.0.0.0:8000
volumes:
- ./src:/src
ports:
- "8000:8000"
depends_on:
- postgres
postgres:
image: postgres:latest
container_name: postgres
environment:
POSTGRES_USER: my_user
POSTGRES_PASSWORD: my_secret_pass!
POSTGRES_DB: my_db
ports:
- "5432:5432"
However, in every single docker-compose file that I see around, the following is added:
volumes:
- ./postgres-data:/var/lib/postgresql/data
What are those volumes used for? Does it mean that if I now restart my postgres container all my data is deleted, but if I had the volumes it is not?
Is my docker-compose.yml ready for production?
docker docker-compose
asked Nov 28 '18 at 23:11
DalvtorDalvtor
850722
I am new to docker, what a wonderful tool!. Following the Django tutorial, their docs provide a basic docker-compose.yml, that looks similar to the following one that I've created.
version: '3'
services:
web:
build: .
container_name: web
command: python manage.py migrate
command: python manage.py runserver 0.0.0.0:8000
volumes:
- ./src:/src
ports:
- "8000:8000"
depends_on:
- postgres
postgres:
image: postgres:latest
container_name: postgres
environment:
POSTGRES_USER: my_user
POSTGRES_PASSWORD: my_secret_pass!
POSTGRES_DB: my_db
ports:
- "5432:5432"
However, in every single docker-compose file that I see around, the following is added:
volumes:
- ./postgres-data:/var/lib/postgresql/data
What are those volumes used for? Does it mean that if I now restart my postgres container all my data is deleted, but if I had the volumes it is not?
Is my docker-compose.yml ready for production?
docker docker-compose
docker docker-compose
asked Nov 28 '18 at 23:11
DalvtorDalvtor
850722
asked Nov 28 '18 at 23:11
DalvtorDalvtor
850722
asked Nov 28 '18 at 23:11
DalvtorDalvtor
850722
asked Nov 28 '18 at 23:11
DalvtorDalvtor
850722
asked Nov 28 '18 at 23:11
DalvtorDalvtor
850722
850722
2
Basically yes, if youdocker-compose downthen the containers are removed and if there is data inside, it is also destroyed. Using volume mount helps it persist between container instances.
– Dan Lowe
Nov 28 '18 at 23:12
add a comment |
2
Basically yes, if youdocker-compose downthen the containers are removed and if there is data inside, it is also destroyed. Using volume mount helps it persist between container instances.
– Dan Lowe
Nov 28 '18 at 23:12
2
2
Basically yes, if you
docker-compose down then the containers are removed and if there is data inside, it is also destroyed. Using volume mount helps it persist between container instances.– Dan Lowe
Nov 28 '18 at 23:12
Basically yes, if you
docker-compose down then the containers are removed and if there is data inside, it is also destroyed. Using volume mount helps it persist between container instances.– Dan Lowe
Nov 28 '18 at 23:12
add a comment |
1 Answer
1
active
oldest
votes
What are those volumes used for?
Volumes persist data from your container to your Docker host.
This:
volumes:
- ./postgres-data:/var/lib/postgresql/data
means that /var/lib/postgresql/data in your container will be persisted in ./postgres-data in your Docker host.
What @Dan Lowe commented is correct, if you do docker-compose down without volumes, all the data insisde your containers will be lost, but if you have volumes the directories, and files you specified will be kept in your Docker host
You can see this data in your Docker host in /var/lib/docker/volumes/<your_volume_name>/_data even after your container don't exist anymore.
answered Nov 29 '18 at 1:29
gascgasc
588314
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
What are those volumes used for?
Volumes persist data from your container to your Docker host.
This:
volumes:
- ./postgres-data:/var/lib/postgresql/data
means that /var/lib/postgresql/data in your container will be persisted in ./postgres-data in your Docker host.
What @Dan Lowe commented is correct, if you do docker-compose down without volumes, all the data insisde your containers will be lost, but if you have volumes the directories, and files you specified will be kept in your Docker host
You can see this data in your Docker host in /var/lib/docker/volumes/<your_volume_name>/_data even after your container don't exist anymore.
answered Nov 29 '18 at 1:29
gascgasc
588314
add a comment |
What are those volumes used for?
Volumes persist data from your container to your Docker host.
This:
volumes:
- ./postgres-data:/var/lib/postgresql/data
means that /var/lib/postgresql/data in your container will be persisted in ./postgres-data in your Docker host.
What @Dan Lowe commented is correct, if you do docker-compose down without volumes, all the data insisde your containers will be lost, but if you have volumes the directories, and files you specified will be kept in your Docker host
You can see this data in your Docker host in /var/lib/docker/volumes/<your_volume_name>/_data even after your container don't exist anymore.
answered Nov 29 '18 at 1:29
gascgasc
588314
add a comment |
What are those volumes used for?
Volumes persist data from your container to your Docker host.
This:
volumes:
- ./postgres-data:/var/lib/postgresql/data
means that /var/lib/postgresql/data in your container will be persisted in ./postgres-data in your Docker host.
What @Dan Lowe commented is correct, if you do docker-compose down without volumes, all the data insisde your containers will be lost, but if you have volumes the directories, and files you specified will be kept in your Docker host
You can see this data in your Docker host in /var/lib/docker/volumes/<your_volume_name>/_data even after your container don't exist anymore.
answered Nov 29 '18 at 1:29
gascgasc
588314
What are those volumes used for?
Volumes persist data from your container to your Docker host.
This:
volumes:
- ./postgres-data:/var/lib/postgresql/data
means that /var/lib/postgresql/data in your container will be persisted in ./postgres-data in your Docker host.
What @Dan Lowe commented is correct, if you do docker-compose down without volumes, all the data insisde your containers will be lost, but if you have volumes the directories, and files you specified will be kept in your Docker host
You can see this data in your Docker host in /var/lib/docker/volumes/<your_volume_name>/_data even after your container don't exist anymore.
answered Nov 29 '18 at 1:29
gascgasc
588314
edited Nov 29 '18 at 1:37
answered Nov 29 '18 at 1:29
gascgasc
588314
answered Nov 29 '18 at 1:29
gascgasc
588314
answered Nov 29 '18 at 1:29
gascgasc
588314
588314
add a comment |
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2
Basically yes, if you
docker-compose downthen the containers are removed and if there is data inside, it is also destroyed. Using volume mount helps it persist between container instances.– Dan Lowe
Nov 28 '18 at 23:12