title: Unable to add new node on Redis Cluster
body: <p>This is an existing 5 nodes Redis cluster. Just want to add a new node. All seems to be fine, except that for some reason it's not being added:</p>
  
  <pre><code> root@tssredis07:/home/# ./redis-trib.rb  add-node 172.16.129.112:6379 172.16.128.208:6379
  &gt;&gt;&gt; Adding node 172.16.129.112:6379 to cluster 172.16.128.208:6379
  &gt;&gt;&gt; Performing Cluster Check (using node 172.16.128.208:6379)
  M: 9205296c296b851a5e3f188f12820c6698cf79f4 172.16.128.208:6379
     slots:6554-9829 (3276 slots) master
     1 additional replica(s)
  S: e489706f6f963401af755a8310635014793c7376 172.16.128.208:6380
     slots: (0 slots) slave
     replicates f33248f075f4369bb57477f8a0bf6d525346c2fd
  S: 3ec915bb4f04cb69badcff1bbe7989ef8e2ae21a 172.16.128.209:6380
     slots: (0 slots) slave
     replicates 2bd8f9d88ffd68ddf1bffe0cd4d1f602dfcec10f
  S: 63df6426dfe1a94849079eb6c79eea9b87ef5c63 172.16.128.216:6380
     slots: (0 slots) slave
     replicates 9205296c296b851a5e3f188f12820c6698cf79f4
  M: c820ba6f6736a5407a65eca09de2c19e6b953df6 172.16.128.210:6380
     slots:0-3276 (3277 slots) master
     1 additional replica(s)
  M: 368f4f921b925bc86c428fe42a5ff65619918aa0 172.16.128.216:6379
     slots:3277-6553 (3277 slots) master
     1 additional replica(s)
  M: f33248f075f4369bb57477f8a0bf6d525346c2fd 172.16.128.209:6379
     slots:9830-13106 (3277 slots) master
     1 additional replica(s)
  M: 2bd8f9d88ffd68ddf1bffe0cd4d1f602dfcec10f 172.16.128.210:6379
     slots:13107-16383 (3277 slots) master
     1 additional replica(s)
  S: 49f9b6ece401cab1207237c1ea94a8e7ca839236 172.16.128.184:6380
     slots: (0 slots) slave
     replicates 368f4f921b925bc86c428fe42a5ff65619918aa0
  S: 35c2d7b46a73b2ad275544caf0485d53a740685f 172.16.128.184:6379
     slots: (0 slots) slave
     replicates c820ba6f6736a5407a65eca09de2c19e6b953df6
  [OK] All nodes agree about slots configuration.
  &gt;&gt;&gt; Check for open slots...
  &gt;&gt;&gt; Check slots coverage...
  [OK] All 16384 slots covered.
  &gt;&gt;&gt; Send CLUSTER MEET to node 172.16.129.112:6379 to make it join the cluster.
  [OK] New node added correctly.
  </code></pre>
  
  <p>But when wanted to see the the cluster nodes from the new node, I don't get them:</p>
  
  <pre><code>root@tssredis07:/home/# redis-cli
  127.0.0.1:6379&gt; cluster nodes
  0e192675e1fb55cca495c9e40c43580b46d344ce :6379@16379 myself,master - 0 0 0   connected
  </code></pre>
  
  <p>Why the new node cluster status is failed?</p>
  
  <pre><code>127.0.0.1:6379&gt; cluster info
  cluster_state:fail
  cluster_slots_assigned:0
  cluster_slots_ok:0
  cluster_slots_pfail:0
  cluster_slots_fail:0
  cluster_known_nodes:1
  cluster_size:0
  cluster_current_epoch:0
  cluster_my_epoch:0
  cluster_stats_messages_sent:0
  cluster_stats_messages_received:0
  </code></pre>
  
  <p>The node was perfect before trying to join the existing cluster, and now:</p>
  
  <pre><code>127.0.0.1:6379&gt; set foo bar
  (error) CLUSTERDOWN The cluster is down
  </code></pre>
  
  <p>The new node configuration file is a copy from another node (and same port) conf file. All is in place. Any help please?</p>