e-Book - Redis in Action

This book covers the use of Redis, an in-memory database/data structure server.
  • Foreword
  • Preface
  • Acknowledgments
  • About this Book
  • About the Cover Illustration
  • Part 1: Getting Started
  • Part 2: Core concepts
  • Part 3: Next steps
  • Appendix A
  • Appendix B
  • Buy the paperback

    4.2.1 Configuring Redis for replication

    As I mentioned in section 4.1.1, when a slave connects to the master, the master will
    start a BGSAVE operation. To configure replication on the master side of things, we
    only need to ensure that the path and filename listed under the dir and dbfilename
    configuration options shown in listing 4.1 are to a path and file that are writable by
    the Redis process.

    Though a variety of options control behavior of the slave itself, only one option is
    really necessary to enable slaving: slaveof. If we were to set slaveof host port in
    our configuration file, the Redis that’s started with that configuration will use the
    provided host and port as the master Redis server it should connect to. If we have an
    already running system, we can tell a Redis server to stop slaving, or even to slave to a
    new or different master. To connect to a new master, we can use the SLAVEOF host
    port
    command, or if we want to stop updating data from the master, we can use
    SLAVEOF no one.

    There’s not a lot to configuring Redis for master/slave operation, but what’s interesting
    and useful to know is what happens to Redis when it becomes a master or slave.