cassandra

Cassandra writer

Cassandra writer provides message repository implementation for Cassandra.

Configuration

The service is configured using the environment variables presented in the following table. Note that any unset variables will be replaced with their default values.

Deployment

  version: "2"
  cassandra-writer:
    image: mainflux/cassandra-writer:[version]
    container_name: [instance name]
    expose:
      - [Service HTTP port]
    restart: on-failure
    environment:
      MF_NATS_URL: [NATS instance URL]
      MF_CASSANDRA_WRITER_LOG_LEVEL: [Cassandra writer log level]
      MF_CASSANDRA_WRITER_PORT: [Service HTTP port]
      MF_CASSANDRA_WRITER_DB_CLUSTER: [Cassandra cluster comma separated addresses]
      MF_CASSANDRA_WRITER_DB_KEYSPACE: [Cassandra keyspace name]
      MF_CASSANDRA_WRITER_DB_USERNAME: [Cassandra DB username]
      MF_CASSANDRA_WRITER_DB_PASSWORD: [Cassandra DB password]
      MF_CASSANDRA_WRITER_DB_PORT: [Cassandra DB port]
      MF_CASSANDRA_WRITER_CHANNELS_CONFIG: [Configuration file path with channels list]
    ports:
      - [host machine port]:[configured HTTP port]
    volume:
      - ./channels.yaml:/config/channels.yaml

To start the service, execute the following shell script:

# download the latest version of the service
go get github.com/mainflux/mainflux


cd $GOPATH/src/github.com/mainflux/mainflux

# compile the cassandra writer
make cassandra-writer

# copy binary to bin
make install

# Set the environment variables and run the service
MF_NATS_URL=[NATS instance URL] MF_CASSANDRA_WRITER_LOG_LEVEL=[Cassandra writer log level] MF_CASSANDRA_WRITER_PORT=[Service HTTP port] MF_CASSANDRA_WRITER_DB_CLUSTER=[Cassandra cluster comma separated addresses] MF_CASSANDRA_WRITER_DB_KEYSPACE=[Cassandra keyspace name] MF_CASSANDRA_READER_DB_USERNAME=[Cassandra DB username] MF_CASSANDRA_READER_DB_PASSWORD=[Cassandra DB password] MF_CASSANDRA_READER_DB_PORT=[Cassandra DB port] MF_CASSANDRA_WRITER_CHANNELS_CONFIG=[Configuration file path with channels list] $GOBIN/mainflux-cassandra-writer

Using docker-compose

This service can be deployed using docker containers. Docker compose file is available in <project_root>/docker/addons/cassandra-writer/docker-compose.yml. In order to run all Mainflux core services, as well as mentioned optional ones, execute following command:

./docker/addons/cassandra-writer/init.sh

Usage

Starting service will start consuming normalized messages in SenML format.