How to check the Nutanix cluster metadata store

Just a quick note.

While upgrading 32 Nutanix nodes for a customer, I wanted to make sure that every node is part of the metadata store.

This can be achieved by entering the command:

nodetool -h localhost ring

Output will look like:

nutanix@NTNX-14SX31290007-C-CVM:10.83.9.152:~$ nodetool -h localhost ring
Address         Status State   Load            Owns    Token
                                                          w7iesrvWOTsU53XPvNTlWCVgub36H9PIJcE3nYDS2rHb4N7XzJEUpGp            lSYYc
10.83.9.153     Up     Normal     1.99 MB         7.18%   0ZbVFDk5VFoTcX78ofInvdnKw0uwRcxGqQsWrwEqmAFERi9ylGNkW86            9cgAe
10.83.9.169     Up     Normal     3.32 MB         11.31%  7aP5UmSTUO2pKO0I6AoPOit7jPzFGXlrDPYvimtqqT3qYI5el9ZXHUx            EdZZf
10.83.9.165     Up     Normal     3.42 MB         6.38%   BXeWgqIKH85IUcIITh1fjgcoYcv1EzVO15vjlxqPKFCUbHEqRhXMLCw            h9xy7
10.83.9.156     Up     Normal     3.16 MB         7.14%   FxyoAoJjF94Yd548AgmY8sXaoLtw5YRyF6dpDTbnXLzOCThcxzM9JrG            md2wa
10.83.9.161     Up     Normal     2.51 MB         5.83%   JaB5mJO5Q7DtPoHbPJd7QFRop57CY3dw3V0LwuJk58EnRPDxmRBr6FM            HLN3R
10.83.9.173     Up     Normal     1.52 MB         6.40%   NYI0KclyR6E8A6Yuok88lWE0yyzBil7vYe6dNrJfaB9iYem7X1D0sHJ            p2oyZ
10.83.9.176     Up     Normal     1.36 MB         6.28%   RRnlFLPALjpn3sCsA7qaMq7Msf8BEEpds0uSokeYLtlYYrb9gBr3mUw            LVcBS
10.83.9.152     Up     Normal     1.56 MB         6.81%   VfPTSjlJyU6ZFogXfaHlFKBwScidSEs61CLtW51mMb2SCOcTZauL7lc            xXrzE
10.83.9.181     Up     Normal     1.32 MB         3.85%   Y3SsPwG3mIRdzZVeED7hKZoCkH32NbDuPqBSH9moN6vtwvD8OGrFR3o            vNXyi
10.83.9.164     Up     Normal     2.31 MB         7.43%   cewHQfBTGVNdNy1BSABrh3DrI7XmbBLtF1EcvZ248cNygdiyAeYv0rk            SapAL
10.83.9.177     Up     Normal     2.82 MB         6.36%   gbLIMnJplxOXX4Jbk4jNxXnMo8njhxcrj6RFsMtZ5hQ7ha6hjT2wsi5            7lsrn
10.83.9.168     Up     Normal     3.16 MB         6.06%   kMR8DmhH2i1YuRgL746IOOXlsv5hitFUHjLO78K1dAlnPBcLdeXKjjX            h2EVF
10.83.9.172     Up     Normal     2.74 MB         6.24%   oEEJaKrjE1ukEkzB6n6fOVUyNK3P8qLkoFyHqrTzXItNBtNS1fxYBv8            DvmjW
10.83.9.180     Up     Normal     1.71 MB         6.70%   sNu0haLD0Zmb3JjtUFkk0Iffuqf0EwspDDbfVD4bDtiHCCarjVF18nY            1zBea
10.83.9.160     Up     Normal     1.8 MB          6.03%   w7iesrvWOTsU53XPvNTlWCVgub36H9PIJcE3nYDS2rHb4N7XzJEUpGp            lSYYc

Updating a single Nutanix node

All the controller VMs of a Nutanix cluster have to have the same version of NOS installed. If you upgrade a cluster. All the CVMs are upgraded one-by-one.If you want to add a new node to the cluster, that node has to have to same version of NOS.

So what if you bought new Nutanix servers and they have a previous version of NOS installed. You cannot add this node to cluster because the NOS version is not the same.

There is a command that you can issue from a CVM that’s part of the cluster to upgrade a single Nutanix node.

1. Login to a CVM that’s part of the cluster.
2. Issue: /home/nutanix/cluster/bin/cluster -u [IP of the node that will be upgraded] upgrade_node

Note that this only upgrades the node and doesn’t downgrade it.