Initial commit

Author: rsangole

00-postgres-init.sh

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+# /bin/sh
+
+# create directory if does not exist
+if [ -d "$HOME/docker/volumes/postgres" ] 
+then
+    echo "Directory $HOME/docker/volumes/postgres exists." 
+else
+    echo "Error: Directory $HOME/docker/volumes/postgres does not exists."
+    mkdir -p $HOME/docker/volumes/postgres
+fi
+
+# launch the postgres image called 'post_setup',
+# attach it to the local volume
+docker run --rm --name post_setup \
+  -e POSTGRES_USER=postgres \
+  -e POSTGRES_PASSWORD=docker \
+  -d \
+  -p 5432:5432 \
+  -v $HOME/docker/volumes/postgres:/var/lib/postgresql/data \
+  postgres:13.3
+
+# create a new role, and two databases
+echo "CREATE ROLE rahul WITH PASSWORD 'pass' CREATEDB LOGIN;
+CREATE DATABASE work; CREATE DATABASE anomaly;" | \
+ docker exec -i post_setup \
+ psql -U postgres
+
+# stop the docker container
+docker stop post_setup

README.md

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+# How to setup a Postgres from scratch
+
+1. Pull postgres docker image using `docker pull postgres:13.3`
+1. Edit `00-postgres-init.sh` with your custom settings
+1. Run `./00-postgres-init.sh`, this sets up new roles + new databases
+1. Check the configuration in `docker-compose.yml` for your postgres database settings and docker images
+1. To run RStudio and Postgres together, run `docker-compose up -d`
+1. Connect to RStudio in a browser using `localhost:8787`
+1. Test your database by running `postgres.R`

docker-compose.yml

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+version: "3.3"
+services:
+  db:
+    image: postgres:13.3
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: "anomaly"
+      POSTGRES_USER: "rahul"
+      POSTGRES_PASSWORD: "pass"
+    ports:
+      - "5432:5432"
+    volumes:
+      - type: "bind"
+        source: "$HOME/docker/volumes/postgres"
+        target: "/var/lib/postgresql/data"
+  rstudio:
+    image: hatmatrix/blog:base
+    ports:
+      - "8787:8787"
+      - "3838:3838"
+    environment:
+      DISABLE_AUTH: "true"
+    volumes:
+      - type: "bind"
+        source: "$HOME/github"
+        target: "/home/rstudio"
+    depends_on:
+      - "db"

postgres.R

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+# Quick script to check if things are working fine
+
+library(DBI)
+library(magrittr)
+
+con <- DBI::dbConnect(
+  drv = RPostgres::Postgres(),
+  dbname = "anomaly",
+  host = "db", # this needs to be the name of the postgres service
+               # (line 3 in docker-compose.yml)
+  user = "rahul",
+  password = "pass",
+  port = 5432
+)
+
+DBI::dbWriteTable(con, "mtcars", mtcars, overwrite = T)
+
+con %>% 
+  DBI::dbListTables()
+
+con %>% 
+  dplyr::tbl("mtcars")
+
+con %>% 
+  DBI::dbListFields("mtcars")
+
+# ---