#016 Docker Databases

Introduction

this is part 16 from the journey it's a long journey(360 day) so go please check previous parts , and if you need to walk in the journey with me please make sure to follow because I may post more than once in 1 Day but surely I will post daily at least one 😍.

And I will cover lot of tools as we move on.

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Docker and databases

This part will be very very short because we talk about volumes before.
but there is a Database special volume.
I am going to use official postgres image in this.
if we go to postgres official image.

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

we have a new tag here -e we didn't talk about before and it's out of the scope for today but in case you a curious

docker run --help | grep -e,

| grep is a linux/unix thing , | it's called pipeline it takes the output of the first and passed to the other program grep is a built in program to search for a text in our case it's -e

-e This is an environment variable that is not Docker specific. Because the variable is used by the postgres server binary

we see that postgres default place to save data is :/var/lib/postgresql/data , it's vary between databases reddis use another location , it depend on every database.

so -v /custom/mount:/var/lib/postgresql/data is our volume for postgres database.

again if you need to use any other database you should read documentation of docker image to see where it store here data.