How to change central node type manually from Failover Node

[rohitk1609]

Hi Techies,

I have 5 servers in my Qlik site

1. Central node(Master Node)

2. Scheduler Node1(Failover Candidate) and Scheduler Node2(Failover Candidate)

3. Consumer Node1 and Consumer Node2

On one incident, services of Central node(Master Node) have been stopped and Scheduler Node2(Failover Candidate) took the charge then Scheduler Node2 is MASTER type with scheduler as MASTER only and Central node became SLAVE and now my new config is

1. Central node(slave or scheduler node)

2. Scheduler Node1(Failover Candidate) and Scheduler Node2(Master Node)

3. Consumer Node1 and Consumer Node2

I want to make my Central node back to Master type of master node. Can please anyone tell me what is the best way to change a node's node type or make my old central node back to master node ?

Thanks,

Rohit

[Levi_Turner · Accepted solution]

Hey Rohit,

You can accomplish this via API call (POST /qrs/failover/tonode/{ServerNode_GUID}).

Video discussing Failover: https://youtu.be/Y5IblMGwrLU?t=335

This can be done in PowerShell when run as the service account (or other account with the QlikClient certificate installed:

$hdrs = @{}
$hdrs.Add("X-Qlik-Xrfkey","examplexrfkey123")
$hdrs.Add("X-Qlik-User", "UserDirectory=INTERNAL; UserId=sa_api")
$cert = Get-ChildItem -Path "Cert:\CurrentUser\My" | Where {$_.Subject -like '*QlikClient*'}
$Data = Get-Content C:\ProgramData\Qlik\Sense\Host.cfg
$FQDN = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($($Data)))
$body = ''
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]'Ssl3,Tls,Tls11,Tls12'
Invoke-RestMethod -Uri "https://$($FQDN):4242/qrs/failover/tonode/GUID?xrfkey=examplexrfkey123" -Method Post -Body $body -Headers $hdrs -ContentType 'application/json' -Certificate $cert

Hope that helps.

[rohitk1609]

Hi Levi thanks for your instant response.

So I tried the solution with power shell.

I copied your code and pasted in notedpad and saved it to .ps1 extension.

I replaced GUID by node id(my old central node but currently its scheduler node).

Currently I tested it in my dev server where there is stand alone Qlik or no rim node(Failover node). It didn't change anything but obviously.

Please confirm which node id I need to use at place of GUID in above code ??.

Second, I watched the your suggested video and tried to do what it say by POSTMAN:

URL: https://84-pc:4242/qrs/failover/tonode/114d1c27-d0de-4f5d-8a3e-46fc6c7ca925

=>Node id: 114d1c27-d0de-4f5d-8a3e-46fc6c7ca925

X-Qlik-Xrfkey: examplexrfkey123

X-Qlik-User: UserDirectory=INTERNAL; UserId=sa_api

but it is throwing error:

Please help me to find where I am wrong.

I like the power shell way but trying to know both one.

Thanks,

Rohit

[Levi_Turner]

RE the GUID: It's the GUID of the server you want to become the Central.

RE Postman: It's hard to tell, but here's a Support article on using Postman: https://qliksupport.force.com/articles/000045268

Hope that helps.

[rohitk1609]

Thank Levi for your instant response. So, I just need to use the power shell script, update GUI, run power shell with admin account(service user) then execute the script. Do i need to restart the service or stop service before execution of script of such node which I want make master node ?

Regards,

Rohit

[Levi_Turner]

Correct, so long as the node is configured as a failover candidate.

[rohitk1609]

Okay Levi, i will first stop services, then execute the script then start the services again.

Thanks,

Rohit

[Levi_Turner]

A service restart should not be needed, by the way.

[rohitk1609]

services stop before execution of script is needed ?

[Levi_Turner]

No. The expected work-flow is: execute script, QRS API(s) handle the changes, end. There's no need to restart services on any node.