I am trying to run postgresql container in my local (Windows 10 machine). i am using this command :
docker run -d --name pg-docker --restart=always --publish 5432:5432 -e POSTGRES_PASSWORD=postgres -v C:\Program Files\Docker\Volumes\pg:/var/lib/postgresql/data postgres:alpine
but its returning "docker: invalid reference format." error.
(P.S. I have my postgresql image)
-v C:\Program Files\Docker\Volumes\pg:/var/lib/postgresql/data is read as two separate arguments due to the space in "Program Files". So "Files\Docker\Volumes\pg:/var/lib/postgresql/data" is interpreted as the docker image name.
Escape the space with a \ or wrap the path in quotes.
Related
I am trying to run postgres on docker with this cmd and It gives error
PS D:\Data Engineering with Zoomcamp> docker run -it -e POSTGRES_USER="root" -e POSTGRES_PASSWORD="root" -e POSTGRES_DB="ny_taxi"D:\Data Engineering with Zoomcamp\ny_taxi_postgres:/var/lib/postgresql/data -p 5432:5432 postgres:13
docker: invalid reference format: repository name must be lowercase.
See 'docker run --help'.
you forgot to add the volume tag. Use below command
docker run -it -e POSTGRES_USER="root" -e POSTGRES_PASSWORD="root" -e POSTGRES_DB="ny_taxi" -v "D:\Data Engineering with Zoomcamp\ny_taxi_postgres":/var/lib/postgresql/data -p 5432:5432 postgres:13
I am working with a codebase that has a docker run command as follows (real name and password removed):
docker run -it --rm --name postgres -p 5432:5432 -e POSTGRES_PASSWORD=password postgres:11.6 -d2
I know that -d flag is to --detach the container, but what is -d2? I can't figure out the purpose of this flag at the end of the command. I'm also confused why it's at the end of the command and not before the IMAGE name like the other flags.
The docker command line is order sensitive. Once docker sees an option or flag it cannot parse, it treats that as the image name. And everything after the image name is the command to run instead of the default command. In other words:
docker run ${options_to_run} ${image_name} ${command_override}
In the postgres image, the entrypoint is docker-entrypoint.sh and the default command is postgres. That means docker will run this container by default as docker-entrypoint.sh postgres (it concatenates the entrypoint and command together into one command with args to run). With the -d2 command override, that becomes docker-entrypoint.sh -d2 and the entrypoint script may interpret that as an option to change how it will run. The entrypoint has special handling for flags:
if [ "${1:0:1}" = '-' ]; then
set -- postgres "$#"
fi
....
exec "$#"
Which means the entrypoint arguments are modified from -d2 to postgres -d2 and then the shell in pid 1 is replaced by the command line arguments, postgres running with the -d2 argument.
I found the answer. -d2 is a postgres CLI option for specifying the debugging level. We are executing the postgres container with that postgres CLI option.
From postgres --help:
-d 1-5 debugging level
I am trying to deploy postgres on docker and it exits immediately after I run it. On checking the logs I get the following error:
chown: cannot dereference '/var/lib/postgresql/data/venv/bin/python3': No such file or directory
The command am running is here below:
sudo docker run -p 5432:5432 -e POSTGRES_USER=superset -e POSTGRES_PASSWORD=mypostgrespassword -e POSTGRES_DB=superset --volume $PWD:/var/lib/postgresql/data -d postgres
How can I fix that?
The problem here is, that the directory you are mounting, is not empty.
Create a empty directory, for example /opt/pgdata and then mount that one:
docker run -p 5432:5432 -e POSTGRES_USER=superset -e POSTGRES_PASSWORD=mypostgrespassword -e POSTGRES_DB=superset -v /opt/pgdata:/var/lib/postgresql/data -d postgres
I found the following mentioned at many places -
docker run -d \
--name some-postgres \
-e POSTGRES_PASSWORD=mysecretpassword \
-e PGDATA=/var/lib/postgresql/data/pgdata \
-v /custom/mount:/var/lib/postgresql/data \
postgres
My only question is that I am unable to find /var/lib/postgresql/data/pgdata directory itself. I don't see any postgresql directory under /var/lib. Why is it? And just wonder how does it work if there is no directory?
The -v in your command mounts /custom/mount on your host (the machine where you run docker command) to container's /var/lib/postgresql/data. So the pgdata you are looking for is on host's /custom/mount/pgdata.
Of course, /custom/data is only an example name, you have to replace it with your real directory.
I want to create 2 containers of postgrSQL so that one can be used as DEV and other as DEV_STAGE.
I was able to successfully create one container and it is been assigned to port 5432. But when I'm trying to the second container, it is getting created(sometimes shows the status as EXITED) but not getting started because of the port number issue.
The below are the commands which I ran.
sudo docker run -v "pwd/data:/var/lib/pgsql/data:Z" -e POSTGRESQL_USER=user1 -e POSTGRESQL_PASSWORD=password -e POSTGRESQL_DATABASE=test_db -d -p 5432:5432 fedora/postgresql
sudo docker run -v "pwd/data_stage:/var/lib/pgsql/data_stage:Z" -e POSTGRESQL_USER=user1 -e POSTGRESQL_PASSWORD=password -e POSTGRESQL_DATABASE=test_db -d -p 5432:5433 fedora/postgresql
I think the port mapping which I'm using is incorrect. But not able to get the correct one.
You have an error in volume definition of the second container. Don't change path after colon, it is mandatory the path is set to /var/lib/pgsql/data.
Also you fliped ports mapping. The correct command is like this:
sudo docker run -v "`pwd`/data_stage:/var/lib/pgsql/data:Z" -e POSTGRESQL_USER=user1 -e POSTGRESQL_PASSWORD=password -e POSTGRESQL_DATABASE=test_db -d -p 5433:5432 fedora/postgresql
If anything goes wrong inspect container logs with docker logs CONTAINER_ID
Thanks for the answer. I corrected the path. I think flipping the port number will not work too. Because I already have one container which is mapped to 5432. So I can't map the port to 5432 again. The below command with worked for me. First, I modified Postgres default port to 5433 using export variable PGPORT=5433.
sudo docker run -v "`pwd`/data_stg:/var/lib/pgsql/data:Z" -e PGPORT=5433 -e POSTGRESQL_USER=user1 -e POSTGRESQL_PASSWORD=password -e POSTGRESQL_DATABASE=test_db -d -p 5433:5433 fedora/postgresql