Charmed Kubernetes

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• channel | string

  Default: 1.35/stable

  Snap channel to install Kubernetes worker services from

• ignore-missing-cni | boolean

  If ignore-missing-cni is set to true, the charm will not enter a blocked state if a CNI has not been configured/provided via relation. If ignore-missing-cni is set to false, and a CNI has not been configured/provided via relation, then the charm will enter a blocked state with the message: "Missing CNI relation or config".

• ingress | boolean

  Default: True

  Deploy nginx-ingress-controller to handle Ingress resources. When set to true, the unit will open ports 80 and 443 to make the nginx-ingress-controller endpoint accessible.

• ingress-default-ssl-certificate | string

  SSL certificate to be used by the default HTTPS server. If one of the flag ingress-default-ssl-certificate or ingress-default-ssl-key is not provided ingress will use a self-signed certificate. This parameter is specific to nginx-ingress-controller.

• ingress-default-ssl-key | string

  Private key to be used by the default HTTPS server. If one of the flag ingress-default-ssl-certificate or ingress-default-ssl-key is not provided ingress will use a self-signed certificate. This parameter is specific to nginx-ingress-controller.

• ingress-proxy-real-ip-cidr | string

  Default: 0.0.0.0/0

  If `ingress-use-forwarded-headers` is enabled, `ingress-proxy-real-ip-cidr` defines the default IP/network address of your external load balancer. Can be a comma-separated list of CIDR blocks. By default NGINX uses the content of the header `X-Forwarded-For` as the source of truth to get information about the client IP address. This works without issues in L7 if we configure the setting `ingress-proxy-real-ip-cidr` with the correct information of the IP/network address of trusted external load balancer. References: - https://kubernetes.github.io/ingress-nginx/user-guide/miscellaneous/#source-ip-address - https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/#proxy-real-ip-cidr

• ingress-ssl-chain-completion | boolean

  Enable chain completion for TLS certificates used by the nginx ingress controller. Set this to true if you would like the ingress controller to attempt auto-retrieval of intermediate certificates. The default (false) is recommended for all production kubernetes installations, and any environment which does not have outbound Internet access.

• ingress-ssl-passthrough | boolean

  Enable ssl passthrough on ingress server. This allows passing the ssl connection through to the workloads and not terminating it at the ingress controller.

• ingress-use-forwarded-headers | boolean

  If true, NGINX passes the incoming X-Forwarded-* headers to upstreams. Use this option when NGINX is behind another L7 proxy / load balancer that is setting these headers. If false, NGINX ignores incoming X-Forwarded-* headers, filling them with the request information it sees. Use this option if NGINX is exposed directly to the internet, or it's behind a L3/packet-based load balancer that doesn't alter the source IP in the packets. Reference: https://github.com/kubernetes/ingress-nginx/blob/a9c706be12a8be418c49ab1f60a02f52f9b14e55/docs/user-guide/nginx-configuration/configmap.md#use-forwarded-headers. docs/user-guide/nginx-configuration/configmap.md#use-forwarded-headers.

• kubelet-extra-args | string

  Space separated list of flags and key=value pairs that will be passed as arguments to kubelet. For example a value like this: runtime-config=batch/v2alpha1=true profiling=true will result in kubelet being run with the following options: --runtime-config=batch/v2alpha1=true --profiling=true

• kubelet-extra-config | string

  Default: {}

  Extra configuration to be passed to kubelet. Any values specified in this config will be merged into a KubeletConfiguration file that is passed to the kubelet service via the --config flag. This can be used to override values provided by the charm. The value for this config must be a YAML mapping that can be safely merged with a KubeletConfiguration file. For example: {evictionHard: {memory.available: 200Mi}} For more information about KubeletConfiguration, see upstream docs: https://kubernetes.io/docs/tasks/administer-cluster/kubelet-config-file/

• labels | string

  Labels can be used to organize and to select subsets of nodes in the cluster. Declare node labels in key=value format, separated by spaces.

• nginx-image | string

  Default: auto

  Container image to use for the nginx ingress controller. Using "auto" will select an image based on architecture. Example: quay.io/kubernetes-ingress-controller/nginx-ingress-controller-amd64:0.32.0

• proxy-extra-args | string

  Space separated list of flags and key=value pairs that will be passed as arguments to kube-proxy. For example a value like this: runtime-config=batch/v2alpha1=true profiling=true will result in kube-apiserver being run with the following options: --runtime-config=batch/v2alpha1=true --profiling=true

• proxy-extra-config | string

  Default: {}

  Extra configuration to be passed to kube-proxy. Any values specified in this config will be merged into a KubeProxyConfiguration file that is passed to the kube-proxy service via the --config flag. This can be used to override values provided by the charm. The value for this config must be a YAML mapping that can be safely merged with a KubeProxyConfiguration file. For example: {mode: ipvs, ipvs: {strictARP: true}} For more information about KubeProxyConfiguration, see upstream docs: https://kubernetes.io/docs/reference/config-api/kube-proxy-config.v1alpha1/

• sysctl | string

  Default: {net.ipv4.conf.all.forwarding: 1, net.ipv4.conf.all.rp_filter: 1, net.ipv4.neigh.default.gc_thresh1: 128, net.ipv4.neigh.default.gc_thresh2: 28672, net.ipv4.neigh.default.gc_thresh3: 32768, net.ipv6.neigh.default.gc_thresh1: 128, net.ipv6.neigh.default.gc_thresh2: 28672, net.ipv6.neigh.default.gc_thresh3: 32768, fs.inotify.max_user_instances: 8192, fs.inotify.max_user_watches: 1048576, kernel.panic: 10, kernel.panic_on_oops: 1, vm.overcommit_memory: 1}

  YAML formatted associative array of sysctl values, e.g.: '{kernel.pid_max: 4194303}'. Note that kube-proxy handles the conntrack settings. The proper way to alter them is to use the proxy-extra-args config to set them, e.g.: juju config kubernetes-control-plane proxy-extra-args="conntrack-min=1000000 conntrack-max-per-core=250000" juju config kubernetes-worker proxy-extra-args="conntrack-min=1000000 conntrack-max-per-core=250000" The proxy-extra-args conntrack-min and conntrack-max-per-core can be set to 0 to ignore kube-proxy's settings and use the sysctl settings instead. Note the fundamental difference between the setting of conntrack-max-per-core vs nf_conntrack_max.