azure cli trigger failover geo-location cache redis

Question

I have created two Premium Azure Cache for Redis resources and set up geo replication. There is a button in the portal to failover manually.

How can I trigger this failover with Azure CLI?

I tried the az redis force-reboot --resource-group $resourceGroupName --name $redisPrimary --reboot-type $rebootType command to no avail.

what's the problem with tis command ? could you add the error message please ? Also which version of az cli are you using ? — Thomas
– Thomas, Commented Sep 13, 2023 at 17:43
@Thomas the command runs fine, the cache is rebooted. But I was hoping that using the force-reboot would trigger a failover to the secondary cache, which is not the case — tutu
– tutu, Commented Sep 13, 2023 at 18:04
have you seen this article ? carlos.mendible.com/2021/11/21/… ? did you have some clients connected to the cache ? — Thomas
– Thomas, Commented Sep 13, 2023 at 18:54
@Thomas thanks for the article. I figured out in the meantime I will have to use Redis CLI. I will take a look and post results (how-to) — tutu
– tutu, Commented Sep 15, 2023 at 7:34

tutu · Accepted Answer · 2023-10-02 11:02:14Z

I did it in PowerShell by breaking the (geo-replication) link between de caches and then re-creating it, making sure to reverse the primary and secondary cache.

Use the provisioning state to monitor the state after deleting or creating the link:

$provisioningState = (Get-AzRedisCache -Name $cacheNamePrimary).ProvisioningState if ($provisioningState -eq 'Succeeded') { etc.. }

One gotcha, after removing the link Remove-AzRedisCacheLink and trying to create a new one New-AzRedisCacheLink, an error might occur even though the provisioning state will report 'Succeeded'. Error message: Operation returned an invalid status code 'Conflict'.

In this case I created a while loop that breaks when the New-AzRedisCacheLink returns no error:

# Create cache link (geo-replication) while ($true) { $provisioningState = (Get-AzRedisCache -Name $cacheNamePrimary).ProvisioningState if ($provisioningState -eq 'Succeeded') { try { New-AzRedisCacheLink -PrimaryServerName $cacheNameSecondary -SecondaryServerName $cacheNamePrimary -ErrorAction Stop break } catch { Write-Output "Trying to creating cache link but received an error '$($_)'.. probably busy processing something.. retrying.." Start-Sleep -Milliseconds 20000 } } else { Start-Sleep -Milliseconds 30000 Write-Output "Still waiting for cache link to be removed.. provisioning status '$provisioningState'.." } }

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