Prepost strategy for MongoDB

prepost_strategies/mongodb/Dockerfile

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+FROM blacklabelops/volumerize
+
+RUN apk add --no-cache \
+    mongodb-tools
+
+COPY postexecute /postexecute
+COPY preexecute /preexecute

prepost_strategies/mongodb/README.md

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+# Using a prepost strategy to create MongoDB backups
+
+Volumerize can execute scripts before and after the backup process.
+
+With this prepost strategy you can create dump of your MongoDB containers and save it with Volumerize.
+
+## Environment Variables
+
+Aside of the required environment variables by Volumerize, this prepost strategy will require a couple of extra variables.
+MONGO_USERNAME MONGO_PASSWORD MONGO_HOST MONGO_PORT
+| Name           | Description                                                |
+| -------------- | ---------------------------------------------------------- |
+| MONGO_USERNAME | Username of the user who will perform the restore or dump. |
+| MONGO_PASSWORD | Password of the user who will perform the restore or dump. |
+| MONGO_HOST     | MongoDB IP or domain.                                      |
+| MONGO_PORT     | MongoDB port.                                              |
+
+## Example with Docker Compose
+
+```YAML
+version: "3"
+
+services:
+  mongodb:
+    image: mongo
+    ports:
+      - 27017:27017
+    environment:
+      - MONGO_INITDB_ROOT_USERNAME=root
+      - MONGO_INITDB_ROOT_PASSWORD=1234
+    volumes:
+      - mongodb:/data/db
+
+  volumerize:
+    build: ./prepost_strategies/mongodb/
+    environment:
+      - VOLUMERIZE_SOURCE=/source
+      - VOLUMERIZE_TARGET=file:///backup
+      - MONGO_USERNAME=root
+      - MONGO_PASSWORD=1234
+      - MONGO_PORT=27017
+      - MONGO_HOST=mongodb
+    volumes:
+      - volumerize-cache:/volumerize-cache
+      - backup:/backup
+    depends_on:
+      - mongodb
+
+volumes:
+  volumerize-cache:
+  mongodb:
+  backup:
+```
+
+Then execute `docker-compose exec volumerize backup` to create a backup of your database and `docker-compose exec volumerize restore` to restore it from your backup.

prepost_strategies/mongodb/postexecute/restore/mongorestore.sh

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+source /preexecute/utils/check-env.sh
+
+check_env "mongorestore" "MONGO_USERNAME" "MONGO_PASSWORD" "MONGO_HOST" "MONGO_PORT"
+
+echo "mongorestore starts"
+mongorestore --host ${MONGO_HOST} --port ${MONGO_PORT} --username ${MONGO_USERNAME} --password "${MONGO_PASSWORD}" ${VOLUMERIZE_SOURCE}
+echo "Import done"

prepost_strategies/mongodb/preexecute/backup/mongodump.sh

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+source /preexecute/utils/check-env.sh
+
+check_env "mongodump" "MONGO_USERNAME" "MONGO_PASSWORD" "MONGO_HOST" "MONGO_PORT"
+
+echo "Creating $VOLUMERIZE_SOURCE folder if not exists"
+mkdir -p $VOLUMERIZE_SOURCE
+
+echo "mongodump starts"
+mongodump --host ${MONGO_HOST} --port ${MONGO_PORT} --username ${MONGO_USERNAME} --password "${MONGO_PASSWORD}" --out ${VOLUMERIZE_SOURCE}

prepost_strategies/mongodb/preexecute/utils/check-env.sh

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+#!/bin/sh
+
+## 
+ # @private
+ # Executed if a variable is not set or is empty string
+ # @param1 - Name of the failed environment variable
+ ##
+function _check_env_failed {
+    echo "Environment variable $1 is not set."
+    echo "Environment variables failed, exit 1"
+    exit 1
+}
+
+## 
+ # @private
+ # Executed if a variable is setted
+ # @param1 - Name of the environment variable
+ ##
+function _check_env_ok {
+    echo "Env var $1 ok."
+}
+
+## 
+ # Use it to check if environment variables are set
+ # @param1      - Name of the context
+ # @param2 to ∞ - Environment variables to check
+ ##
+function check_env {
+    echo "Checking environment variables for $1."
+
+    for e_var in "$@"; do
+        if [ $e_var = $1 ]; then continue; fi # Jump first arg
+
+        # Check if env var is setted, if not raise error
+        if [ "${!e_var}" = "" ]; then 
+            _check_env_failed $e_var; 
+        else 
+            _check_env_ok $e_var; 
+        fi
+
+    done
+    echo "Environment variables ok."
+}