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Added replica init
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Zakary Timson
2026-06-12 02:24:35 -04:00
parent 34c5c3b3e1
commit f81e6cd951
3 changed files with 69 additions and 16 deletions
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29
README.md
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@@ -41,25 +41,28 @@ MongoDB + Backups & Retention
## About
Custom MongoDB Docker image extending `mongo:latest` with automated backup functionality.
Custom MongoDB Docker image extending `mongo:latest` with automated backups, retention management, and replica set configuration.
Installs cron to run scheduled mongodump operations with compression and retention management, while preserving all native MongoDB server functionality.
Includes cron-based scheduled `mongodump` operations with compression, automatic stale lock recovery on unclean shutdowns, and zero-config replica set initialization — while preserving all native MongoDB functionality.
Backups can be manually triggered with: `docker --exec -t mongodb backup`
**Manually trigger a backup:**
docker exec -t mongodb backup
To restore a backup, uncompress it and use the official `mongorestore`
**Restore a backup:**
Decompress the archive and use the official `mongorestore` tool.
### Environment Variables
| Variable | Description | Default | Example |
|------------------------------|--------------------------------------------------|--------------------------|---------------|
| `BACKUP_CRON` | Cron schedule expression | | `0 */6 * * *` |
| `BACKUP_DIR` | Directory to store backups | `/data/backups` | `/backups` |
| `BACKUP_DB` | Database to backup | `$MONGO_INITDB_DATABASE` | `admin` |
| `BACKUP_RETENTION` | Number of backups to keep, defaults to unlimited | | `7` |
| `MONGO_INITDB_DATABASE` | Default database name | | `momentum` |
| `MONGO_INITDB_ROOT_USERNAME` | Root username for mongodump auth | | `root` |
| `MONGO_INITDB_ROOT_PASSWORD` | Root password for mongodump auth | | `secret` |
| Variable | Description | Default | Example |
|------------------------------|----------------------------------------------------------------------|--------------------------|-----------------------|
| `BACKUP_CRON` | Cron schedule expression | | `0 */6 * * *` |
| `BACKUP_DIR` | Directory to store backups | `/data/backups` | `/backups` |
| `BACKUP_DB` | Database to backup | `$MONGO_INITDB_DATABASE` | `admin` |
| `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` |
| `REPLICA` | Comma-separated list of replica hostnames to init/join a replica set | | `db1:27017,db2:27017` |
### Built With

11
docker-compose.yml
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@@ -1,5 +1,5 @@
services:
db:
db1:
build: .
environment:
MONGO_INITDB_DATABASE: momentum
@@ -8,6 +8,13 @@ services:
BACKUP_CRON: "0 2 * * *"
BACKUP_RETENTION: "7"
BACKUP_DIR: /data/backups
REPLICA: db1:27017,db2:27017 # CSV, Must match hostname
volumes:
- data:/data/db
- data1:/data/db
- backups:/data/backups
db2:
build: .
environment:
REPLICA: db1:27017,db2:27017 # CSV, Must match hostname
volumes:
- data2:/data/db

43
entrypoint.sh
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@@ -15,5 +15,48 @@ if [ -f /data/db/mongod.lock ] || [ -f /data/db/WiredTiger.lock ] || [ -f /data/
echo "Repair complete, starting normally..."
fi
if [ -n "$REPLICA" ]; then
# Start mongo temporarily in background with replSet enabled
mongod --replSet rs0 --bind_ip_all &
MONGO_PID=$!
# Wait for mongo to be ready
echo "Waiting for MongoDB to be ready..."
until mongosh --quiet --eval "db.runCommand({ ping: 1 })" &>/dev/null; do
sleep 1
done
# Build members array from REPLICA CSV
MEMBERS=""
INDEX=0
IFS=',' read -ra HOSTS <<< "$REPLICA"
for HOST in "${HOSTS[@]}"; do
[ $INDEX -gt 0 ] && MEMBERS+=","
MEMBERS+="{ _id: $INDEX, host: '$HOST' }"
INDEX=$((INDEX + 1))
done
# Init or reconfig replica set
mongosh --quiet --eval "
try {
const config = rs.conf();
config.members = [$MEMBERS];
rs.reconfig(config, { force: true });
print('Replica set reconfigured');
} catch(e) {
rs.initiate({ _id: 'rs0', members: [$MEMBERS] });
print('Replica set initiated');
}
"
# Stop the temporary mongod
kill $MONGO_PID
wait $MONGO_PID 2>/dev/null
fi
if [ -n "$REPLICA" ]; then
set -- mongod --replSet rs0 --bind_ip_all
fi
# Hand off to normal mongo entrypoint
exec /usr/local/bin/docker-entrypoint.sh "$@"