docs,salt: Allow to set maxPods for Kubelet

CHANGELOG.md

@@ -23,6 +23,10 @@
   remove MetalK8s ISOs from a cluster
   (PR[#3730](https://github.com/scality/metalk8s/pull/3730))
 
+- Allow, from the Bootstrap configuration, to manage the maximum
+  number of pods that can be scheduled on each nodes
+  (PR[#3821](https://github.com/scality/metalk8s/pull/3821))
+
 ### Removals
 
 - The `Statefulsets` Grafana dashboard has been removed

docs/installation/bootstrap.rst

@@ -97,6 +97,9 @@ Configuration
               hard: []
               soft:
                 - topologyKey: kubernetes.io/hostname
+        kubelet:
+          config:
+            maxPods: 110
 
 The ``networks`` field specifies a range of IP addresses written in CIDR
 notation for it's various subfields.
@@ -269,6 +272,9 @@ defaults kubernetes configuration.
   deleting them. If it's set to 0, the terminated pod garbage collector is
   disabled (default to ``500``)
 
+  From ``kubelet`` section you can override the max number of pods that can
+  be scheduled on each nodes.
+
 .. _Feature Gates: https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/
 .. _specific OpenID for kube-apiserver: https://kubernetes.io/docs/reference/access-authn-authz/authentication/#openid-connect-tokens
 

salt/metalk8s/kubernetes/kubelet/standalone.sls

@@ -94,6 +94,9 @@ Create kubelet config file:
         address: {{ grains['metalk8s']['control_plane_ip'] }}
         rotateCertificates: false
         port: 10250
+        {%- if pillar.get("kubernetes:kubelet:config:maxPods") %}
+        maxPods: {{ pillar.kubernetes.kubelet.config.maxPods }}
+        {%- endif %}
 {%- for key, value in kubelet.config.items() %}
         {{ key }}: {{ value }}
 {%- endfor %}