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Add small CPU resource requests to static pods #161

Merged
merged 1 commit into from
Nov 14, 2019
Merged

Add small CPU resource requests to static pods #161

merged 1 commit into from
Nov 14, 2019

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dghubble
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  • Set small CPU requests on static pods kube-apiserver,
    kube-controller-manager, and kube-scheduler to align with
    upstream tooling and for edge cases
  • Control plane nodes are tainted to isolate them from
    ordinary workloads. Even dense workloads can only compress
    CPU resources on worker nodes.
  • Control plane static pods use the highest priority class, so
    contention favors control plane pods (over say node-exporter)
    and CPU is compressible too.
  • Effectively, a practical case for these requests hasn't been
    observed. However, a small static pod CPU request may offer
    a slight benefit if a controller became overloaded and the
    above mechanisms were insufficient for some reason (bit of a
    stretch, due to CPU compressibility)
  • Continue to avoid setting a memory request for static pods.
    It would impose a hard size requirement on controller nodes,
    which isn't warranted and is handled more gently by Typhoon
    default instance types across clouds and via docs

@dghubble
Add small CPU resource requests to static pods
0f1f16c 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
above mechanisms were insufficient for some reason (bit of a
stretch, due to CPU compressibility)
* Continue to avoid setting a memory request for static pods.
It would impose a hard size requirement on controller nodes,
which isn't warranted and is handled more gently by Typhoon
default instance types across clouds and via docs
@dghubble dghubble merged commit 0f1f16c into master Nov 14, 2019
@dghubble dghubble deleted the static-pod-cpu-requests branch November 14, 2019 01:14
dghubble added a commit to poseidon/typhoon that referenced this pull request Nov 14, 2019
@dghubble
Add small CPU resource requests to static pods
b3e8826 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient for some reason (bit of a
stretch, due to CPU compressibility)

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
@dghubble dghubble mentioned this pull request Nov 14, 2019
Merged
dghubble added a commit to poseidon/typhoon that referenced this pull request Nov 14, 2019
@dghubble
Add small CPU resource requests to static pods
2732923 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient for some reason (bit of a
stretch, due to CPU compressibility)

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
dghubble added a commit to poseidon/typhoon that referenced this pull request Nov 14, 2019
@dghubble
Add small CPU resource requests to static pods
0e4ee5e 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
dghubble-robot pushed a commit to poseidon/terraform-onprem-kubernetes that referenced this pull request Nov 14, 2019
@dghubble
Add small CPU resource requests to static pods
f15838c 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
dghubble-robot pushed a commit to poseidon/terraform-digitalocean-kubernetes that referenced this pull request Nov 14, 2019
@dghubble
Add small CPU resource requests to static pods
79b3911 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
dghubble-robot pushed a commit to poseidon/terraform-aws-kubernetes that referenced this pull request Nov 14, 2019
@dghubble
Add small CPU resource requests to static pods
e7a5824 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
dghubble-robot pushed a commit to poseidon/terraform-google-kubernetes that referenced this pull request Nov 14, 2019
@dghubble
Add small CPU resource requests to static pods
728497b 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
dghubble added a commit that referenced this pull request Dec 9, 2019
@dghubble
Tune static pod CPU requests slightly lower
7df6bd8 
* Reduce kube-apiserver and kube-controller-manager CPU
requests from 200m to 150m. Prefer slightly lower commitment
after running with the requests chosen in #161 for a while
* Reduce calico-node CPU request from 150m to 100m to match
CoreDNS and flannel
dghubble-robot pushed a commit to poseidon/terraform-azure-kubernetes that referenced this pull request May 25, 2020
@dghubble
Add small CPU resource requests to static pods
8fb0d03 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
Snaipe pushed a commit to aristanetworks/monsoon that referenced this pull request Apr 13, 2023
@dghubble
Add small CPU resource requests to static pods
7b03677 
* Set small CPU requests on static pods kube-apiserver,
kube-controller-manager, and kube-scheduler to align with
upstream tooling and for edge cases
* Effectively, a practical case for these requests hasn't been
observed. However, a small static pod CPU request may offer
a slight benefit if a controller became overloaded and the
below mechanisms were insufficient

Existing safeguards:

* Control plane nodes are tainted to isolate them from
ordinary workloads. Even dense workloads can only compress
CPU resources on worker nodes.
* Control plane static pods use the highest priority class, so
contention favors control plane pods (over say node-exporter)
and CPU is compressible too.

See: poseidon/terraform-render-bootstrap#161
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