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Cloud-wide settings

Each of these is stored by the platform and applies to every node; none needs a restart. Most were first set at install.

Setting Show Change Guide
Upstream DNS servers stratumctl admin dns upstream-servers get stratumctl admin dns upstream-servers set 192.0.2.53 DNS
Fallback to root servers the same stratumctl admin dns upstream-servers fallback on DNS
VPC resolver replicas stratumctl admin dns recursor-settings get stratumctl admin dns recursor-settings set --replicas 2 (a cluster only; a single node takes 1)
Release mirror and update checks stratumctl admin upgrade mirror get stratumctl admin upgrade mirror set --url ..., --interval, --disable Versions and update checks
Host reservation, per node stratumctl nodes get <node-id> stratumctl nodes set-reservation <node-id> --memory-gib 12 Host reservation
Managed services stratumctl admin services list stratumctl admin services enable <key> Managed services
Operator webhook stratumctl admin observability operator-webhook get ... operator-webhook set --url-stdin Alarms
Quota defaults stratumctl admin quotas defaults stratumctl admin quotas set-default --dimension ... --limit ... Quotas
Custom instance shapes stratumctl admin custom-shape-policy get install stratumctl admin custom-shape-policy set install --enabled --max-vcpus 16
Platform backup console: Backup & DR the backup config API Backup

Custom shapes let tenants launch with their own vCPU and memory sizes instead of an instance type, within the bounds set here. Console: Admin › Platform › Catalog › Custom Shapes.

Fixed at install, changed only by reinstalling: the region name, the DNS parent domain, and the default VPC CIDR for new projects.