title: Redis Sentinel myid
body: <p>Does anyone know how redis sentinel determines the value for 
  <code>myid</code> in the config file?</p>
  
  <p>I've created an image for deploying redis on my network but the Redis Sentinel values for <code>myid</code> are all duplicated, which is causing lots of log spam showing:</p>
  
  <p><code>
  [991] 30 Nov 20:56:48.639 * -dup-sentinel master mymaster 10.254.18.162 6379 #duplicate of 10.254.18.160:26379 or e2aa60902f872679221db15c4b414c7d5b3eca7c
  [991] 30 Nov 20:56:48.639 * +sentinel sentinel 10.254.18.160:26379 10.254.18.160 26379 @ mymaster 10.254.18.162 6379
  </code></p>
  
  <p>Attempts at manually changing the value fail b/c the file rewrites itself with the old value.</p>