Configure Policy Controller for high availability

You can set deployment-level configurations for Policy Controller that override resource requirements and configure parameters for high availability.

To get a list of all configuration options, run gcloud container fleet policycontroller deployment set --help.

The commands on this page use the --all-memberships flag to apply a configuration to all clusters registered to a fleet. To apply a command to a single, registered cluster instead, use --membership=MEMBERSHIP_NAME, replacing MEMBERSHIP_NAME with the membership name of the registered cluster.

Configure replica counts

You can configure your Policy Controller deployments for a ReplicaSet by setting a replica count.

To set a replica count, run the following command:

gcloud container fleet policycontroller deployment set DEPLOYMENT_TYPE replica-count QUANTITY \
  --all-memberships

Replace the following:

DEPLOYMENT_TYPE: the deployment type that you want to set a replica count for. The value is either mutation or admission.
QUANTITY: the number of replicas that you want to set, for example 3.

To remove a replica count, run the following command:

gcloud container fleet policycontroller deployment remove DEPLOYMENT_TYPE replica-count \
  --all-memberships

Replace DEPLOYMENT_TYPE with the deployment type that you're removing the replicas from. This value is either mutation or admission.

Set resource requirements

You can specify limits and requests for memory and CPU.

Set memory limits and requests

To set a memory limit, run the following command:

gcloud container fleet policycontroller deployment set DEPLOYMENT_TYPE memory-limit QUANTITY \
  --all-memberships

Replace the following:

DEPLOYMENT_TYPE: the deployment type that you want to set a memory limit on. One of the following values: audit, mutation, or admission.
QUANTITY: the quantity that you want to set with a quantity suffix, for example 4Gi.

To set a memory request, run the following command:

gcloud container fleet policycontroller deployment set DEPLOYMENT_TYPE memory-request QUANTITY \
  --all-memberships

Replace the following:

DEPLOYMENT_TYPE: the deployment type that you want to set a memory request on. One of the following values: audit, mutation, or admission.
QUANTITY: the quantity that you want to set with a quantity suffix, for example 2Gi.

Set CPU limits and requests

To set a CPU limit, run the following command:

gcloud container fleet policycontroller deployment set DEPLOYMENT_TYPE cpu-limit QUANTITY \
  --all-memberships

Replace the following:

DEPLOYMENT_TYPE: the deployment type that you want to set a CPU limit on. One of the following values: audit, mutation, or admission.
QUANTITY: the CPU quantity that you want to set, for example 500m.

To set a CPU request, run the following command:

gcloud container fleet policycontroller deployment set DEPLOYMENT_TYPE cpu-request QUANTITY \
  --all-memberships

Replace the following:

DEPLOYMENT_TYPE: the deployment type that you want to set a CPU request on. One of the following values: audit, mutation, or admission.
QUANTITY: the quantity that you want to set, for example 250m.

Remove limits and requests

To remove a configuration, run the following command:

gcloud container fleet policycontroller deployment remove DEPLOYMENT_TYPE RESOURCE_TYPE \
  --all-memberships

Replace the following:

DEPLOYMENT_TYPE: the deployment type that you're removing the request or limit on. One of the following values: audit, mutation, or admission.
RESOURCE_TYPE: the resource type that you want to remove. One of the following values: memory-limit, memory-request, cpu-limit, cpu-request.

Configure tolerations

You can set tolerations on your Policy Controller deployments.

You can set a toleration with one of the following methods:

To set a toleration with a key, run the following command:

gcloud container fleet policycontroller deployment set admission toleration KEY \
  --all-memberships

Replace KEY with your key value, for example key1.

To set a toleration with a key and value, run the following command:
```
gcloud container fleet policycontroller deployment set admission toleration KEY=VALUE \
  --all-memberships
```
Replace the following:
- KEY: your key value, for example key1.
- VALUE: your key value, for example value1.
To set a toleration with a key and value, and the effect NoSchedule, run the following command:
```
gcloud container fleet policycontroller deployment set admission toleration KEY=VALUE \
  --all-memberships \
  --effect=NoSchedule
```
Replace the following:
- KEY: your key value, for example key1.
- VALUE: your key value, for example value1.

If you need to edit a toleration, you must remove the existing toleration and then set a new toleration with one of the previous commands. To remove a toleration, run the previous command with remove instead of set, for example:

gcloud container fleet policycontroller deployment remove admission toleration KEY=VALUE \
  --all-memberships

Configure affinity

You can set pod affinity on your Policy Controller deployments. The available settings are anti (corresponding to anti-affinity) and none (corresponding to no-affinity). For the admissions deployment, anti is the default. For all other deployments, none is the default.

To set pod anti-affinity, run the following command:

gcloud container fleet policycontroller deployment set mutation pod-affinity anti \
  --all-memberships

To remove pod affinity, run the following command:

gcloud container fleet policycontroller deployment set mutation pod-affinity none \
  --all-memberships