How to turn on/off log_bin while mysql is running?

[Á¤ Çϳç]

    I'm setting up two servers as one master and one slave, and the slave will take over
  master's role when the original master fails.
    I'd like to turn off log_bin in slave and turn on it only when the slave becomes a
master.
   
    Is it possible?
    query like "SET GLOBAL log_bin=ON" does not work.

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