Fixed backups & added replica recovery

README.md

@@ -51,12 +51,15 @@ To restore a backup, uncompress it and use the official `mongorestore`
 
 ### Environment Variables
 
-| Variable           | Description                    | Default                  | Example       |
+| Variable                     | Description                                      | Default                  | Example       |
-|--------------------|--------------------------------|--------------------------|---------------|
+|------------------------------|--------------------------------------------------|--------------------------|---------------|
-| `BACKUP_CRON`      | Cron schedule expression       | -                        | `0 */6 * * *` |
+| `BACKUP_CRON`                | Cron schedule expression                         |                          | `0 */6 * * *` |
-| `BACKUP_DIR`       | Directory to store backups     | /data/backups            | `/backups`    |
+| `BACKUP_DIR`                 | Directory to store backups                       | `/data/backups`          | `/backups`    |
-| `BACKUP_DB`        | Database that will be backedup | `$MONGO_INITDB_DATABASE` | `admin`       |               |
+| `BACKUP_DB`                  | Database to backup                               | `$MONGO_INITDB_DATABASE` | `admin`       |
-| `BACKUP_RETENTION` | Number of backups to keep      | -                        | `7`           |
+| `BACKUP_RETENTION`           | Number of backups to keep, defaults to unlimited |                          | `7`           |
+| `MONGO_INITDB_DATABASE`      | Default database name                            |                          | `momentum`    |
+| `MONGO_INITDB_ROOT_USERNAME` | Root username for mongodump auth                 |                          | `root`        |
+| `MONGO_INITDB_ROOT_PASSWORD` | Root password for mongodump auth                 |                          | `secret`      |
 
 ### Built With
 

backup.sh

@@ -1,18 +1,16 @@
 #!/bin/bash
 
 TIMESTAMP=$(date +%Y-%m-%d_%H-%M-%S)
-BACKUP_FILE="${MONGO_INITDB_DATABASE}_${TIMESTAMP}.dump.tar.gz"
+if [[ -z "$BACKUP_DB" ]]; then BACKUP_DB="$MONGO_INITDB_DATABASE"; fi
+BACKUP_FILE="${BACKUP_DB}_${TIMESTAMP}.dump.tar.gz"
 TEMP_DUMP="/tmp/mongo_dump_${TIMESTAMP}"
 
-# Create & zip backup
 mkdir -p "$BACKUP_DIR"
-if [[ -z "$BACKUP_DB" ]]; then BACKUP_DB="$MONGO_INITDB_DATABASE"; fi
+mongodump --host localhost --db "$BACKUP_DB" -u "$MONGO_INITDB_ROOT_USERNAME" -p "$MONGO_INITDB_ROOT_PASSWORD" --out "$TEMP_DUMP"
-mongodump --host localhost --db "$BACKUP_DB" -u "$MONGO_INITDB_ROOT_USERNAME" -p "$MONGO_INITDB_ROOT_USERNAME" --out "$TEMP_DUMP"
 tar -czf "${BACKUP_DIR}/${BACKUP_FILE}" -C "$TEMP_DUMP" .
 rm -rf "$TEMP_DUMP"
 
-# Remove old backups
 if [[ -n "$BACKUP_RETENTION" ]]; then
-	cd "$BACKUP_DIR"
+    cd "$BACKUP_DIR"
-	ls -1t dump_${MONGO_INITDB_DATABASE}_*.tar.gz | tail -n +$((BACKUP_RETENTION + 1)) | xargs -r rm -f
+    ls -1t ${BACKUP_DB}_*.dump.tar.gz | tail -n +$((BACKUP_RETENTION + 1)) | xargs -r rm -f
 fi

docker-compose.yml

@@ -0,0 +1,13 @@
+services:
+    db:
+        build: .
+        environment:
+            MONGO_INITDB_DATABASE: momentum
+            MONGO_INITDB_ROOT_USERNAME: root
+            MONGO_INITDB_ROOT_PASSWORD: secret
+            BACKUP_CRON: "0 2 * * *"
+            BACKUP_RETENTION: "7"
+            BACKUP_DIR: /data/backups
+        volumes:
+            - data:/data/db
+            - backups:/data/backups

entrypoint.sh

@@ -1,12 +1,16 @@
 #!/bin/bash
 
-# Setup cron job if BACKUP_CRON is set
 if [ -n "$BACKUP_CRON" ]; then
-    echo "$BACKUP_CRON /usr/local/bin/backup.sh >> /var/log/mongo-backup.log 2>&1" > /etc/cron.d/mongo-backup
+    env >> /etc/environment
+    echo "$BACKUP_CRON root . /etc/environment; /usr/local/bin/backup >> /var/log/mongo-backup.log 2>&1" > /etc/cron.d/mongo-backup
     chmod 0644 /etc/cron.d/mongo-backup
-    crontab /etc/cron.d/mongo-backup
     cron
 fi
 
-# Execute original mongo entrypoint
+# Clean up stale locks from unclean shutdown
+rm -f /data/db/mongod.lock
+rm -f /data/db/.lock
+rm -f /data/db/WiredTiger.lock
+mongod --replSet rs0 --repair
+
 exec /usr/local/bin/docker-entrypoint.sh "$@"