Add data persistence in hyperledger fabric - couchdb

Question

I have built a hyperledger fabric network. The below is the configuration right now in my docker-compose.yaml file.
peer0.org1.example.com:
container_name: peer0.org1.example.com
image: hyperledger/fabric-peer:latest
environment:
- GODEBUG=netdns=go
- CORE_PEER_ID=peer0.org1.example.com
- CORE_PEER_ADDRESS=peer0.org1.example.com:7051
- CORE_PEER_GOSSIP_BOOTSTRAP=peer1.org1.example.com:7051
- CORE_PEER_GOSSIP_EXTERNALENDPOINT=peer0.org1.example.com:7051
- CORE_PEER_LOCALMSPID=Org1MSP
- CORE_VM_ENDPOINT=unix:///host/var/run/docker.sock
- CORE_VM_DOCKER_HOSTCONFIG_NETWORKMODE=${COMPOSE_PROJECT_NAME}_example
- FABRIC_LOGGING_SPEC=INFO
- CORE_PEER_TLS_ENABLED=true
- CORE_PEER_GOSSIP_USELEADERELECTION=true
- CORE_PEER_GOSSIP_ORGLEADER=false
- CORE_PEER_PROFILE_ENABLED=true
- CORE_PEER_TLS_CERT_FILE=/etc/hyperledger/fabric/tls/server.crt
- CORE_PEER_TLS_KEY_FILE=/etc/hyperledger/fabric/tls/server.key
- CORE_PEER_TLS_ROOTCERT_FILE=/etc/hyperledger/fabric/tls/ca.crt
- CORE_LEDGER_STATE_STATEDATABASE=CouchDB
- CORE_LEDGER_STATE_COUCHDBCONFIG_COUCHDBADDRESS=couchdb0:5984
- CORE_LEDGER_STATE_COUCHDBCONFIG_USERNAME=
- CORE_LEDGER_STATE_COUCHDBCONFIG_PASSWORD=
volumes:
- /var/run/:/host/var/run/
- ./crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/msp:/etc/hyperledger/fabric/msp
- ./crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls:/etc/hyperledger/fabric/tls
- peer0.org1.example.com:/var/hyperledger/production
working_dir: /opt/gopath/src/github.com/hyperledger/fabric/peer
command: peer node start
ports:
- 7051:7051
- 7053:7053
depends_on:
- couchdb0
networks:
- example
couchdb0:
container_name: couchdb0
image: hyperledger/fabric-couchdb
environment:
- COUCHDB_USER=
- COUCHDB_PASSWORD=
ports:
- "5984:5984"
networks:
- example
I have missed on adding the configuration for data persistence.
I am following this documentation link to add data persistence.
So after I add below line in fabric-couchdb it will use the host machine's specified file system for storing data.
volumes:
- /var/hyperledger/couchdb0:/opt/couchdb/data
But the thing that I am not able to figure out is how do we retrieve the current data that is present in the network now. Where does fabric-couchdb stores data by default? Can we not copy the old data from default folder location to new folder location?

Answer 1

If you define the CouchDB volume as you say, your host folder should be in /var/hyperledger/couchdb0.
You can always run docker volume ls and docker volume inspect your_volume_name to check the mount point of your volumes.
If you have not defined volumes for your container and you want to retrieve the folder (I think that's your problem), then try:
docker cp couchdb0:/opt/couchdb/data your-host-destination-folder