mirror of
https://github.com/dokku/dokku.git
synced 2025-12-16 20:17:44 +01:00
feat: add the ability to create k3s node profiles
Node profiles can be used to specify repetitive options for clusters, making it easier to add specific types of instances quickly. This PR additionally fixes kubelet-args specification - the same key can be specified multiple times, such as when specifying custom sysctl rules.
This commit is contained in:
Jose Diaz-Gonzalez
@@ -12,7 +12,10 @@ scheduler-k3s:cluster-list # Lists all nodes in a Dokku
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scheduler-k3s:cluster-remove [node-id] # Removes client node to a Dokku-managed cluster
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scheduler-k3s:ensure-charts # Ensures the k3s charts are installed
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scheduler-k3s:initialize # Initializes a cluster
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scheduler-k3s:labels:set <app|--global> <property> (<value>) [--process-type PROCESS_TYPE] <--resource-type RESOURCE_TYPE>, Set or clear a label for a given app/process-type/resource-type combination
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scheduler-k3s:labels:set <app|--global> <property> (<value>) [--process-type PROCESS_TYPE] <--resource-type RESOURCE_TYPE> # Set or clear a label for a given app/process-type/resource-type combination
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scheduler-k3s:profiles:add <profile> [--role ROLE] [--insecure-allow-unknown-hosts] [--taint-scheduling] [--kubelet-args KUBELET_ARGS] Adds a node profile to the k3s cluster
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scheduler-k3s:profiles:list [--format json|stdout] # Lists all node profiles in the k3s cluster
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scheduler-k3s:profiles:remove <profile> # Removes a node profile from the k3s cluster
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scheduler-k3s:report [<app>] [<flag>] # Displays a scheduler-k3s report for one or more apps
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scheduler-k3s:set [<app>|--global] <key> (<value>) # Set or clear a scheduler-k3s property for an app or the scheduler
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scheduler-k3s:show-kubeconfig # Displays the kubeconfig for remote usage
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@@ -83,6 +86,22 @@ Nodes that run app workloads can be added via the `scheduler-k3s:cluster-add` co
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dokku scheduler-k3s:cluster-add ssh://root@worker-1.example.com
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```
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Per-node kubelet flags can be supplied by passing `--kubelet-args` with a comma-separated `key=value` list. This is useful for tuning scheduler capacity or enforcing cluster-wide defaults at the node level.
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```shell
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dokku scheduler-k3s:cluster-add \
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--kubelet-args allowed-unsafe-sysctls=net.ipv6.conf.all.disable_ipv6 \
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ssh://root@worker-1.example.com
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```
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Multiple kubelet arguments can be specified in the same call by separating them with commas. The following example enables IPv4 forwarding while also increasing the pod density on the worker.
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```shell
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dokku scheduler-k3s:cluster-add \
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--kubelet-args allowed-unsafe-sysctls=net.ipv6.conf.all.disable_ipv6,max-pods=150 \
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ssh://root@worker-2.example.com
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```
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If the server isn't in the `known_hosts` file, the connection will fail. This can be bypassed by setting the `--insecure-allow-unknown-hosts` flag:
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```shell
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@@ -134,6 +153,48 @@ When attaching an worker or server node, the K3s plugin will look at the IP asso
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dokku scheduler-k3s:set --global network-interface eth1
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```
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### Node Profiles
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Node profiles capture repeatable `scheduler-k3s:cluster-add` options so you can join multiple nodes with identical settings. A profile name can be specified for the `scheduler-k3s:cluster-add` command via the `--profile <name>` flag. Any flags passed directly to `scheduler-k3s:cluster-add` override the stored values for that run.
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#### Listing profiles
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Display stored profiles to understand which roles and behaviors will be used.
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```shell
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dokku scheduler-k3s:profiles:list
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```
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```
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name role
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awesome-profile worker
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```
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This command also takes an optional `--format` flag to specify a format for the output. Options include `json` and `stdout`
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#### Adding profiles
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Create or update a profile that defines how new nodes should be prepared before joining the cluster.
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```shell
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dokku scheduler-k3s:profiles:add edge-workers \
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--role worker \
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--insecure-allow-unknown-hosts \
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--kubelet-args protect-kernel-defaults=true,eviction-hard=memory.available<200Mi
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```
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Profile names must be alphanumeric, may include internal dashes, cannot start/end with a dash, and must be ≤32 characters. Other than the `--server-ip` flag, all flags used for `scheduler-k3s:cluster-add` are valid for the `scheduler-k3s:profiles:add` command.
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#### scheduler-k3s:profiles:remove
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Delete a profile once it’s no longer required.
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```shell
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dokku scheduler-k3s:profiles:remove edge-workers
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```
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Removal only deletes the stored definition; nodes that already joined the cluster keep their existing configuration.
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### Changing deployment settings
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The k3s plugin provides a number of settings that can be used to managed deployments on a per-app basis. The following table outlines ones not covered elsewhere:
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@@ -164,10 +164,26 @@ var HelmRepositories = []HelmRepository{
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},
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}
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// NodeProfile is a profile for a node in the k3s cluster
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type NodeProfile struct {
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// Name is the name of the node profile
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Name string `json:"name"`
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// Role is the role of the node
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Role string `json:"role"`
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// AllowUknownHosts is whether to allow unknown hosts
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AllowUknownHosts bool `json:"allow_unknown_hosts,omitempty"`
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// TaintScheduling is whether to taint the node for scheduling
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TaintScheduling bool `json:"taint_scheduling,omitempty"`
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// KubeletArgs is a list of kubelet arguments
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KubeletArgs []string `json:"kubelet_args,omitempty"`
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}
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// ServerLabels are the labels for a server node
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var ServerLabels = map[string]string{
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"svccontroller.k3s.cattle.io/enablelb": "true",
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}
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// WorkerLabels are the labels for a worker node
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var WorkerLabels = map[string]string{
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"node-role.kubernetes.io/worker": "worker",
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}
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@@ -19,12 +19,15 @@ Additional commands:`
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helpContent = `
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scheduler-k3s:autoscaling-auth:set <app|--global> <trigger> [<--metadata key=value>...], Set or clear a scheduler-k3s autoscaling keda trigger authentication resource for an app
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scheduler-k3s:annotations:set <app|--global> <property> (<value>) [--process-type PROCESS_TYPE] <--resource-type RESOURCE_TYPE>, Set or clear an annotation for a given app/process-type/resource-type combination
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scheduler-k3s:cluster-add [--insecure-allow-unknown-hosts] [--server-ip SERVER_IP] [--taint-scheduling] <ssh://user@host:port>, Adds a server node to a Dokku-managed cluster
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scheduler-k3s:cluster-add [--profile PROFILE] [--role ROLE] [--insecure-allow-unknown-hosts] [--server-ip SERVER_IP] [--taint-scheduling] [--kubelet-args KUBELET_ARGS] <ssh://user@host:port>, Adds a server node to a Dokku-managed cluster
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scheduler-k3s:cluster-list [--format json|stdout], Lists all nodes in a Dokku-managed cluster
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scheduler-k3s:cluster-remove [node-id], Removes client node to a Dokku-managed cluster
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scheduler-k3s:ensure-charts, Ensures the k3s charts are installed
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scheduler-k3s:initialize [--server-ip SERVER_IP] [--taint-scheduling], Initializes a cluster
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scheduler-k3s:labels:set <app|--global> <property> (<value>) [--process-type PROCESS_TYPE] <--resource-type RESOURCE_TYPE>, Set or clear a label for a given app/process-type/resource-type combination
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scheduler-k3s:profiles:add <profile> [--role ROLE] [--insecure-allow-unknown-hosts] [--taint-scheduling] [--kubelet-args KUBELET_ARGS], Adds a node profile to the k3s cluster
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scheduler-k3s:profiles:list [--format json|stdout], Lists all node profiles in the k3s cluster
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scheduler-k3s:profiles:remove <profile>, Removes a node profile from the k3s cluster
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scheduler-k3s:report [<app>] [<flag>], Displays a scheduler-k3s report for one or more apps
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scheduler-k3s:set <app> <property> (<value>), Set or clear a scheduler-k3s property for an app
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scheduler-k3s:show-kubeconfig, Displays the kubeconfig for remote usage
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@@ -59,11 +59,12 @@ func main() {
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allowUknownHosts := args.Bool("insecure-allow-unknown-hosts", false, "insecure-allow-unknown-hosts: allow unknown hosts")
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taintScheduling := args.Bool("taint-scheduling", false, "taint-scheduling: add a taint against scheduling app workloads")
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serverIP := args.String("server-ip", "", "server-ip: IP address of the dokku server node")
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kubeletArgs := args.StringToString("kubelet-args", map[string]string{}, "kubelet-args: a key=value map of kubelet arguments")
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kubeletArgs := args.StringSlice("kubelet-args", []string{}, "kubelet-args: repeatable key=value kubelet arguments (e.g., --kubelet-args key=value)")
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role := args.String("role", "worker", "role: [ server | worker ]")
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profileName := args.String("profile", "", "profile: name of the node profile to use")
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args.Parse(os.Args[2:])
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remoteHost := args.Arg(0)
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err = scheduler_k3s.CommandClusterAdd(*role, remoteHost, *serverIP, *allowUknownHosts, *taintScheduling, *kubeletArgs)
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err = scheduler_k3s.CommandClusterAdd(*profileName, *role, remoteHost, *serverIP, *allowUknownHosts, *taintScheduling, *kubeletArgs)
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case "cluster-list":
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args := flag.NewFlagSet("scheduler-k3s:cluster-list", flag.ExitOnError)
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format := args.String("format", "stdout", "format: [ stdout | json ]")
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@@ -103,6 +104,25 @@ func main() {
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}
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err = scheduler_k3s.CommandLabelsSet(appName, *processType, *resourceType, property, value)
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case "profiles:add":
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args := flag.NewFlagSet("scheduler-k3s:profiles:add", flag.ExitOnError)
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role := args.String("role", "worker", "role: [ server | worker ]")
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allowUknownHosts := args.Bool("insecure-allow-unknown-hosts", false, "insecure-allow-unknown-hosts: allow unknown hosts")
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taintScheduling := args.Bool("taint-scheduling", false, "taint-scheduling: add a taint against scheduling app workloads")
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kubeletArgs := args.StringSlice("kubelet-args", []string{}, "kubelet-args: repeatable key=value kubelet arguments (e.g., --kubelet-args key=value)")
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args.Parse(os.Args[2:])
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profileName := args.Arg(0)
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err = scheduler_k3s.CommandProfilesAdd(profileName, *role, *allowUknownHosts, *taintScheduling, *kubeletArgs)
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case "profiles:list":
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args := flag.NewFlagSet("scheduler-k3s:profiles:list", flag.ExitOnError)
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format := args.String("format", "stdout", "format: [ stdout | json ]")
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args.Parse(os.Args[2:])
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err = scheduler_k3s.CommandProfilesList(*format)
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case "profiles:remove":
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args := flag.NewFlagSet("scheduler-k3s:profiles:remove", flag.ExitOnError)
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args.Parse(os.Args[2:])
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profileName := args.Arg(0)
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err = scheduler_k3s.CommandProfilesRemove(profileName)
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case "report":
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args := flag.NewFlagSet("scheduler-k3s:report", flag.ExitOnError)
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format := args.String("format", "stdout", "format: [ stdout | json ]")
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@@ -9,6 +9,7 @@ import (
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"net/url"
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"os"
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"os/signal"
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"regexp"
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"slices"
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"sort"
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"strings"
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@@ -400,7 +401,7 @@ func CommandInitialize(ingressClass string, serverIP string, taintScheduling boo
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}
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// CommandClusterAdd adds a server to the k3s cluster
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func CommandClusterAdd(role string, remoteHost string, serverIP string, allowUknownHosts bool, taintScheduling bool, kubeletArgs map[string]string) error {
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func CommandClusterAdd(profileName string, role string, remoteHost string, serverIP string, allowUknownHosts bool, taintScheduling bool, kubeletArgs []string) error {
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if err := isK3sInstalled(); err != nil {
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return fmt.Errorf("k3s not installed, cannot add node to cluster: %w", err)
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}
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@@ -414,8 +415,38 @@ func CommandClusterAdd(role string, remoteHost string, serverIP string, allowUkn
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return fmt.Errorf("kubernetes api not available, cannot add node to cluster: %w", err)
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}
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if role != "server" && role != "worker" {
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return fmt.Errorf("Invalid server-type: %s", role)
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incomingProfile := NodeProfile{}
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if profileName != "" {
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properties := common.PropertyGetDefault("scheduler-k3s", "--global", fmt.Sprintf("node-profile-%s", profileName), "")
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if properties == "" {
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return fmt.Errorf("Node profile %s not found", profileName)
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}
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err = json.Unmarshal([]byte(properties), &incomingProfile)
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if err != nil {
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return fmt.Errorf("Unable to unmarshal node profile: %w", err)
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}
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}
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if role != "" {
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incomingProfile.Role = role
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}
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if allowUknownHosts {
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incomingProfile.AllowUknownHosts = allowUknownHosts
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}
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if taintScheduling {
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incomingProfile.TaintScheduling = taintScheduling
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}
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if len(kubeletArgs) > 0 {
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incomingProfile.KubeletArgs = kubeletArgs
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}
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if incomingProfile.Role != "server" && incomingProfile.Role != "worker" {
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return fmt.Errorf("Invalid role: %s", incomingProfile.Role)
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}
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token := getGlobalGlobalToken()
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@@ -423,7 +454,7 @@ func CommandClusterAdd(role string, remoteHost string, serverIP string, allowUkn
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return fmt.Errorf("Missing k3s token")
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}
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if taintScheduling && role == "worker" {
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if incomingProfile.TaintScheduling && incomingProfile.Role == "worker" {
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return fmt.Errorf("Taint scheduling can only be used on the server role")
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}
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@@ -472,14 +503,14 @@ func CommandClusterAdd(role string, remoteHost string, serverIP string, allowUkn
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}
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common.LogDebug(fmt.Sprintf("k3s version: %s", k3sVersion))
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common.LogInfo1(fmt.Sprintf("Joining %s to k3s cluster as %s", remoteHost, role))
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common.LogInfo1(fmt.Sprintf("Joining %s to k3s cluster as %s", remoteHost, incomingProfile.Role))
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common.LogInfo2Quiet("Updating apt")
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aptUpdateCmd, err := common.CallSshCommand(common.SshCommandInput{
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Command: "apt-get",
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Args: []string{
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"update",
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},
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AllowUknownHosts: allowUknownHosts,
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AllowUknownHosts: incomingProfile.AllowUknownHosts,
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RemoteHost: remoteHost,
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StreamStdio: true,
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Sudo: true,
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@@ -503,7 +534,7 @@ func CommandClusterAdd(role string, remoteHost string, serverIP string, allowUkn
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"nfs-common",
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"wireguard",
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},
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AllowUknownHosts: allowUknownHosts,
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AllowUknownHosts: incomingProfile.AllowUknownHosts,
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RemoteHost: remoteHost,
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StreamStdio: true,
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Sudo: true,
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@@ -522,7 +553,7 @@ func CommandClusterAdd(role string, remoteHost string, serverIP string, allowUkn
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"-o /tmp/k3s-installer.sh",
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"https://get.k3s.io",
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},
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AllowUknownHosts: allowUknownHosts,
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AllowUknownHosts: incomingProfile.AllowUknownHosts,
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RemoteHost: remoteHost,
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StreamStdio: true,
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})
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@@ -540,7 +571,7 @@ func CommandClusterAdd(role string, remoteHost string, serverIP string, allowUkn
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"0755",
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"/tmp/k3s-installer.sh",
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},
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AllowUknownHosts: allowUknownHosts,
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AllowUknownHosts: incomingProfile.AllowUknownHosts,
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RemoteHost: remoteHost,
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StreamStdio: true,
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})
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@@ -577,7 +608,7 @@ export INSTALL_K3S_VERSION=%s
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tmpFile.Close()
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sftpCopyCmd, err := common.CallSftpCopy(common.SftpCopyInput{
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AllowUknownHosts: allowUknownHosts,
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AllowUknownHosts: incomingProfile.AllowUknownHosts,
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DestinationPath: "/tmp/k3s-installer-executor.sh",
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RemoteHost: remoteHost,
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SourcePath: tmpFile.Name(),
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@@ -595,7 +626,7 @@ export INSTALL_K3S_VERSION=%s
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"0755",
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"/tmp/k3s-installer-executor.sh",
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},
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AllowUknownHosts: allowUknownHosts,
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AllowUknownHosts: incomingProfile.AllowUknownHosts,
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RemoteHost: remoteHost,
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StreamStdio: true,
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})
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@@ -634,7 +665,7 @@ export INSTALL_K3S_VERSION=%s
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token,
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}
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if role == "server" {
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if incomingProfile.Role == "server" {
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args = append([]string{"server"}, args...)
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// expose etcd metrics
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args = append(args, "--etcd-expose-metrics")
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@@ -661,19 +692,19 @@ export INSTALL_K3S_VERSION=%s
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args = append(args, "--kube-proxy-arg", "metrics-bind-address=0.0.0.0")
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}
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if taintScheduling {
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if incomingProfile.TaintScheduling {
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args = append(args, "--node-taint", "CriticalAddonsOnly=true:NoSchedule")
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}
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for key, value := range kubeletArgs {
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args = append(args, "--kubelet-arg", fmt.Sprintf("%s=%s", key, value))
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for _, kubeletArg := range incomingProfile.KubeletArgs {
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args = append(args, "--kubelet-arg", kubeletArg)
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}
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common.LogInfo2Quiet(fmt.Sprintf("Adding %s k3s cluster", nodeName))
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joinCmd, err := common.CallSshCommand(common.SshCommandInput{
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Command: "/tmp/k3s-installer-executor.sh",
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Args: args,
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AllowUknownHosts: allowUknownHosts,
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AllowUknownHosts: incomingProfile.AllowUknownHosts,
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RemoteHost: remoteHost,
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StreamStdio: true,
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Sudo: true,
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@@ -699,7 +730,7 @@ export INSTALL_K3S_VERSION=%s
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}
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labels := ServerLabels
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if role == "worker" {
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if incomingProfile.Role == "worker" {
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labels = WorkerLabels
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}
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@@ -995,6 +1026,115 @@ func CommandLabelsSet(appName string, processType string, resourceType string, k
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return nil
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}
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// CommandProfilesAdd adds a node profile to the k3s cluster
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func CommandProfilesAdd(profileName string, role string, allowUknownHosts bool, taintScheduling bool, kubeletArgs []string) error {
|
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if role != "server" && role != "worker" {
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return fmt.Errorf("Invalid role: %s", role)
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}
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|
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if profileName == "" {
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return fmt.Errorf("Missing profile name")
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}
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// profile names must only contain alphanumeric characters and dashes and cannot start with a dash
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if !regexp.MustCompile(`^[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?$`).MatchString(profileName) {
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return fmt.Errorf("Invalid profile name, must only contain alphanumeric characters and dashes and cannot start with a dash: %s", profileName)
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}
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// ensure profile names are no longer than 32 characters
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if len(profileName) > 32 {
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||||
return fmt.Errorf("Profile name is too long, must be less than 32 characters: %s", profileName)
|
||||
}
|
||||
|
||||
profile := NodeProfile{
|
||||
Name: profileName,
|
||||
Role: role,
|
||||
AllowUknownHosts: allowUknownHosts,
|
||||
TaintScheduling: taintScheduling,
|
||||
KubeletArgs: kubeletArgs,
|
||||
}
|
||||
|
||||
data, err := json.Marshal(profile)
|
||||
if err != nil {
|
||||
return fmt.Errorf("Unable to marshal node profile to json: %w", err)
|
||||
}
|
||||
|
||||
if err := common.PropertyWrite("scheduler-k3s", "--global", fmt.Sprintf("node-profile-%s.json", profileName), string(data)); err != nil {
|
||||
return fmt.Errorf("Unable to write node profile: %w", err)
|
||||
}
|
||||
|
||||
common.LogInfo1(fmt.Sprintf("Node profile %s added", profileName))
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// CommandProfilesList lists the node profiles in the k3s cluster
|
||||
func CommandProfilesList(format string) error {
|
||||
if format != "stdout" && format != "json" {
|
||||
return fmt.Errorf("Invalid format: %s", format)
|
||||
}
|
||||
|
||||
properties, err := common.PropertyGetAllByPrefix("scheduler-k3s", "--global", "node-profile-")
|
||||
if err != nil {
|
||||
return fmt.Errorf("Unable to get node profiles: %w", err)
|
||||
}
|
||||
|
||||
output := []NodeProfile{}
|
||||
for _, data := range properties {
|
||||
var profile NodeProfile
|
||||
err := json.Unmarshal([]byte(data), &profile)
|
||||
if err != nil {
|
||||
return fmt.Errorf("Unable to unmarshal node profile: %w", err)
|
||||
}
|
||||
|
||||
output = append(output, profile)
|
||||
}
|
||||
|
||||
if format == "stdout" {
|
||||
lines := []string{"name|role"}
|
||||
for _, profile := range output {
|
||||
lines = append(lines, fmt.Sprintf("%s|%s", profile.Name, profile.Role))
|
||||
}
|
||||
|
||||
columnized := columnize.SimpleFormat(lines)
|
||||
fmt.Println(columnized)
|
||||
return nil
|
||||
}
|
||||
|
||||
b, err := json.Marshal(output)
|
||||
if err != nil {
|
||||
return fmt.Errorf("Unable to marshal json: %w", err)
|
||||
}
|
||||
|
||||
fmt.Println(string(b))
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// CommandProfilesRemove removes a node profile from the k3s cluster
|
||||
func CommandProfilesRemove(profileName string) error {
|
||||
if profileName == "" {
|
||||
return fmt.Errorf("Missing profile name")
|
||||
}
|
||||
|
||||
// profile names must only contain alphanumeric characters and dashes and cannot start with a dash
|
||||
if !regexp.MustCompile(`^[a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?$`).MatchString(profileName) {
|
||||
return fmt.Errorf("Invalid profile name, must only contain alphanumeric characters and dashes and cannot start with a dash: %s", profileName)
|
||||
}
|
||||
|
||||
// ensure profile names are no longer than 32 characters
|
||||
if len(profileName) > 32 {
|
||||
return fmt.Errorf("Profile name is too long, must be less than 32 characters: %s", profileName)
|
||||
}
|
||||
|
||||
if err := common.PropertyDelete("scheduler-k3s", "--global", fmt.Sprintf("node-profile-%s.json", profileName)); err != nil {
|
||||
return fmt.Errorf("Unable to delete node profile: %w", err)
|
||||
}
|
||||
|
||||
common.LogInfo1(fmt.Sprintf("Node profile %s removed", profileName))
|
||||
return nil
|
||||
}
|
||||
|
||||
// CommandReport displays a scheduler-k3s report for one or more apps
|
||||
func CommandReport(appName string, format string, infoFlag string) error {
|
||||
if len(appName) == 0 {
|
||||
|
||||
Reference in New Issue
Block a user