Enable disabled user accout in ipmi using ipmitool on hypervisor

If users are disabled in IPMI, you can enable it by using ipmitool on the hypervisor:

This will show all users:

[root@esxi]# /ipmitool user list

so mostly user "2" is the default ADMIN user. you can reenable it using following command:

[root@esxi]# /ipmitool user enable 2

Maintenance Mode for CVM

ncli host list (to get UUID from the host)

ncli host edit id=<insert uuid here> enable-maintenance-mode='false' | 'true'

Use 'true' to get into maintenance mode and 'false' to get off

Maintenancemode für AHV und ESX siehe hier:

https://portal.nutanix.com/page/documents/kbs/details?targetId=kA00e000000LIQoCAO

CVM
Placing the CVM in maintenance does not migrate VMs from the host. The hypervisor must be placed in maintenance mode to migrate VMs. See the relevant section for your hypervisor below to accomplish this.

First, get the CVM host ID:

nutanix@cvm$ ncli host ls

The host ID is consists of the characters to the right of the double colons. In the example below it is "11":

Id                        : xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx::11

To place CVM maintenance mode:

nutanix@cvm$ ncli host edit id=<host_id> enable-maintenance-mode=true

To exit CVM maintenance mode execute the command below from a CVM that is not in maintenance mode:

nutanix@cvm$ ncli host edit id=<host_id> enable-maintenance-mode=false

 

ESXi
To place ESXi host in maintenance mode:

root@esxi# esxcli system maintenanceMode set --enable true

To end ESXi host maintenance mode:

root@esxi# esxcli system maintenanceMode set --enable false

To verify the maintenance mode status of an ESXi host:

root@esxi# esxcli system maintenanceMode get

 

AHV
To get the AHV hypervisor address:

nutanix@cvm$ acli host.list

To enter AHV host maintenance mode:

nutanix@cvm$ acli host.enter_maintenance_mode <hypervisor_address> wait=true

To exit AHV host maintenance mode:

nutanix@cvm$ acli host.exit_maintenance_mode <hypervisor_address>

 

Error – Foundation service running on one of the nodes

Under normal operations, the foundation service is stopped on all cluster nodes. Only if you destroy a cluster, the foundation service gets started permanently until you create a new cluster / add the nodes to an existing cluster.

As far as I know the only other component within AOS is LCM, which leverages the foundation service for certain hardware update tasks like a BIOS update. This is also the most common reason, why a foundation process is started / still running in an “normal” cluster: Some sort of previous failed LCM actions.

To check if and where Foundation is running ssh into one of the CVMs and run the following command:

allssh 'genesis status | grep foundation'

As you can see in my output it was running on my CVM with the .24 IP-address (the process IDs in the brackets is the indication that the process is up and running):

To stop the foundation process just ssh to the related CVM and run:

genesis stop foundation

The output will directly show you that the service is now stopped

Now just run LCM / Foundation upgrade again and the pre-checks will succeed.

Node stucks in Phoenix (no boot back to Hypervisor)

If a node stucks in Phoenix you can get it back to the HV, but first check that there are no tasks runing from phoenix: On a CVM check this:

ecli task.list include_completed=false
host_upgrade_status
firmware_upgrade_status

If there is nothing running, you can do this in Phoenix:

python /phoenix/reboot_to_host.py

Then the host will boot back to HV, you will have to remove the CVM from maintenance mode:

cluster status (to see, if everything in the Cluster is ok)

ncli host list (to get UUID from the host)

ncli host edit id=<insert uuid here> enable-maintenance-mode='false'

Check the metadataring:

nodetool -h localhost ring

If the Host is AHV, you have to leave Maintenance Mode for AHV, too:

acli host.list
acli host.exit_maintenance_mode <hostname>

or in newer Versions use the Nutanix provided script:

also first check upgrade status etc.

then on a CVM:

python /home/nutanix/cluster/bin/lcm/lcm_node_recovery.py <IP of affected CVM/phoenix>

This works with ESXi and AHV, maybe you have to provide the vCenter and Credentials.

The script should also end the foundation service, but this don't work.

So after bringing back the node you have to check:

allssh 'genesis status|grep foundation'

If foundation is running on one node

allssh genesis stop foundation

Then the Node should be back and running in your cluster.

Performance on NFS datastores decrease within a couple of days after host reboot

known issue -> https://kb.vmware.com/s/article/67129

set max connection per nfs store to 32 by using:

esxcfg-advcfg -s 32 /SunRPC/MaxConnPerIP

or via GUI in advanced settings of the esxi server

Change VM VLAN ID int acli (before 5.10.X)

In pre-5.10.x versions, you cannot change the vlan id of an existing vm nic in Prism. For that, you can use following command from any of the cvms

1. Please shutdown the VM
2. Connect to any of the cvm
3. Update the nic: acli vm.nic_update VMNAME 50:6b:8d:1e:40:50 network=VLAN_150

Prism Central Registration failed

We got problems by registrating PE at PC

Please verify that if you configured a proxy server, that you whitelist the PC-IP-Adress at PE Site and the PE-IP-Adress from PC Site. Otherwise Prism tries to connect by using the proxy.

Configuring VMware vSwitches by vSphere CLI (using hostssh for nutanix cluster)

Configuring VMware vSwitches by vSphere CLI (using hostssh for nutanix cluster)

you can set the following commands in a nutanix CVM. If you are not using nutanix - you can remove the "hostssh" parameter in front of the command.

1. Set active uplink ports in vSwitch0

hostssh esxcli network vswitch standard policy failover set -a vmnic2,vmnic3 -v vSwitch0

2. Remove unused ports in vSwitch0

hostssh esxcli network vswitch standard uplink remove --uplink-name=vmnic0 --vswitch-name=vSwitch0

3. Create VM portgroup in vSwitch 0

hostssh esxcli network vswitch standard portgroup add -p <VM NETWORK> -v vSwitch0

4. Set vlan ID for the newly created portgroup

hostssh esxcli network vswitch standard portgroup set -p <VM NETWORK> --vlan-id 55

Usefull Links

Change Default Passwords:

https://portal.nutanix.com/#/page/kbs/details?targetId=kA00e000000LKXcCAO

Firewall Requirements:

https://portal.nutanix.com/#/page/docs/details?targetId=Web-Console-Guide-Prism-v55:wc-support-firewall-wc-c.html

Metro:

https://portal.nutanix.com/#/page/docs/details?targetId=Web-Console-Guide-Prism-v58:sto-metro-availability-c.html#nconcept_j3q_rny_yp

https://vtricks.com/de-nutanix-metro-availability-auf-vmware-vsphere/

Maintenance Mode:

https://vmwaremine.com/2017/05/10/how-to-put-nutanix-acropolis-host-into-maintenance-mode/#sthash.h0w9d32n.dpbs

CVM Command:

links http://localhost:2010 und 2009

Clear stucking task in Nutanix

If there is a stucked task in nutanix which you cannot "cancel" it, there are a way to clean it by using the ecli (prior 5.5.5 you have to use the acli commands for that)

connect to a cvm:

ecli task.list include_completed=false
ergon_update_task --task_uuid='UUID' --task_status=succeeded

Check latest FATAL Errors in a Nutanix Cluster

allssh „ls -rtl  data/logs/*FATAL | tail -n 5“

Deployment Nutanix Witness VM on ESXi

Deploy the ova

You can change the ip in the following config-file

$ sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0

change the parameters

NETMASK=“255.255.255.0″

IPADDR=“10.10.10.10″

BOOTPROTO=“none“

GATEWAY=“10.10.10.1″

$ sudo reboot

After the reboot please enter folliwing comand to create the witness (as a witness)

$ cluster -s 10.10.10.10 –cluster_function_list=witness_vm create

Register the witness in the nutanix menu and set the witness at the protection domains.

Break Replication timeout at Nutanix Metro Installation

Error (only metro deployments): Break replication timeout of metro protection domain is below the recommended minimum of 15 seconds or metro availability is disabled.

You have to set the timeout to 15s

Login auf CVM Cluster 1:

ncli pd list

protection-domain set-auto-replication-break name=“Metro01″ wait-period=15

You have to set the timeout on the second cluster for his "active" storage containers as well

Deployment Xtract VM on AHV Cluster

1. Download the latest Xtract VM at Nutanix support portal
2. start Xtract Cli  (is included in the *.zip) C:\install .\cli-windows-amd64-1.1.3.exe -c <Nutanix_Cluster_IP_address>
3. Deployment: 
   deploy-vm vm-container <container_name> vm-network <network_name> ip-address <static_IP_address> netmask <netmask> gateway <gateway_IP_address> dns1 <DNS_IP_address> dns2 <DNS_IP_address>

Performance Diagnostics at a Nutanix cluster

Enter the following command at one of the cvms. By doing that, some diag-VMs were automatically deployed to check the cluster performance.

diagnostics/diagnostics.py --display_latency_stats --run_iperf run

Cleanup the installation:
diagnostics/diagnostics.py cleanup

Maintenance Mode on Nutanix AHV

on one of the cvms:

acli host.list

enter maintenance mode with the following command:

acli host.enter_maintenance_mode <hostname>

Shut down the CVM.

cvm_shutdown -P now

Shutdown AHV Node:

root@ahv# shutdown -h now 

Exit Maintenance Mode:

acli host.exit_maintenance_mode <hostname>

Networktagging Nutanix AHV

1) Tagged VLAN ID on AHV Hypervisor  (on each node)

nutanix@CVM$ ssh root@192.168.5.1 „ovs-vsctl set port br0 tag=123“
nutanix@CVM$ ssh root@192.168.5.1 „ovs-vsctl list port br0“

2) Tagged VLAN ID on CVM (on each cvm):

nutanix@CVM$ change_cvm_vlan 123

3) change Uplinks to only 10G Ports

– login on cvm

– list current state:

#> allssh manage_ovs show_uplinks

– change to 10G:

#> allssh ‚manage_ovs –bridge_name br0 –interfaces 10g –bond_name br0-up update_uplinks‘