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ArnabChatterjee20k
52 lines
2.1 KiB
Bash
52 lines
2.1 KiB
Bash
#!/bin/bash
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# MongoDB Replica Set Initialization Script
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# Runs after MongoDB starts as part of docker-entrypoint-initdb.d
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# Check if replica set is already initialized
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RS_STATUS=$(mongosh --username root --password "${MONGO_INITDB_ROOT_PASSWORD}" --authenticationDatabase admin --eval "try { rs.status().ok } catch(e) { 0 }" --quiet 2>/dev/null || echo "0")
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if [ "$RS_STATUS" = "1" ]; then
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echo "Replica set already initialized"
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exit 0
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fi
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# Initialize replica set
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echo "Initializing replica set 'rs0'..."
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# For single-node replica set, we can use localhost since clients connect directly
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# The MongoDB driver will handle connection to this node
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mongosh --username root --password "${MONGO_INITDB_ROOT_PASSWORD}" --authenticationDatabase admin --eval "rs.initiate({ _id: 'rs0', members: [{ _id: 0, host: '127.0.0.1:27017' }] })"
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# Wait for replica set to elect a primary and become stable
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echo "Waiting for PRIMARY to be ready..."
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MAX_WAIT=15
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COUNTER=0
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while [ $COUNTER -lt $MAX_WAIT ]; do
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# Use try/catch to handle cases where rs.status() fails during initialization
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PRIMARY_STATE=$(mongosh --username root --password "${MONGO_INITDB_ROOT_PASSWORD}" --authenticationDatabase admin --eval "try { rs.status().members[0].stateStr } catch(e) { 'WAITING' }" --quiet 2>/dev/null || echo "WAITING")
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if [ "$PRIMARY_STATE" = "PRIMARY" ]; then
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echo "PRIMARY is ready!"
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break
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fi
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# Give it more time between checks
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sleep 2
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COUNTER=$((COUNTER+1))
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# Only show status every few attempts to reduce log noise
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if [ $((COUNTER % 3)) -eq 0 ]; then
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echo "Still waiting for PRIMARY (attempt $COUNTER/$MAX_WAIT, current state: $PRIMARY_STATE)..."
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fi
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done
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# Don't fail the init even if PRIMARY isn't ready immediately
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# MongoDB will continue to elect a primary in the background
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# Clients will wait for it to be ready via their connection retry logic
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if [ $COUNTER -eq $MAX_WAIT ]; then
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echo "NOTE: PRIMARY not confirmed within $((MAX_WAIT * 2)) seconds, but replica set is configured"
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echo "MongoDB will continue initializing the replica set in the background"
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fi
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echo "Replica set initialization complete!"
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