title: WSREP: Failed to read 'ready ' from: wsrep_sst_xtrabackup --role 'joiner' --address
body: <p>When I attempt to join a node to a cluster using the xtrabackup sst option, I get the following error:</p>
  
  <blockquote>
    <p>WSREP: Failed to read 'ready ' from: wsrep_sst_xtrabackup --role 'joiner' --address...</p>
  </blockquote>
  
  <p>How can I fix this issue?</p>