nfs_share_docker

Pre-requisite
Update the file with your node ip address
vi /etc/exports

/root/nfs      192.168.1xx.xxx(rw,sync,no_root_squash,no_subtree_check)
/root/nfs      192.168.1xx.1xx(rw,sync,no_root_squash,no_subtree_check)
/root/nfs      192.168.xxx.1xx(rw,sync,no_root_squash,no_subtree_check)

exportfs -a

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On Docker nodes install nfs utils

yum install nfs-utils

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Add firewall exceptions

firewall-cmd --permanent --zone=public --add-service=nfs
firewall-cmd --reload
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Create NFS docker volume on all nodes

docker volume create --driver local --name db_data --opt type=nfs4 --opt device=:/root/nfs/data --opt o=addr=192.168.xxx.1xx,rw,nolock

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Create Docker service with NFS volume

docker service create --name db --network mynetwork --mount type=volume,source=db_data,target=/var/lib/postgresql/data -e POSTGRES_PASSWORD=password --replicas 2 postgres:9.4