mirror of https://github.com/k3s-io/k3s
92 lines
3.0 KiB
Go
92 lines
3.0 KiB
Go
// +build linux
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ipvs
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import (
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"fmt"
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"regexp"
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"strings"
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"k8s.io/apimachinery/pkg/util/sets"
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utilsexec "k8s.io/utils/exec"
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"k8s.io/klog"
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)
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// RequiredIPVSKernelModulesAvailableCheck tests IPVS required kernel modules.
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type RequiredIPVSKernelModulesAvailableCheck struct {
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Executor utilsexec.Interface
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}
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// Name returns label for RequiredIPVSKernelModulesAvailableCheck
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func (r RequiredIPVSKernelModulesAvailableCheck) Name() string {
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return "RequiredIPVSKernelModulesAvailable"
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}
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// Check try to validates IPVS required kernel modules exists or not.
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// The name of function can not be changed.
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func (r RequiredIPVSKernelModulesAvailableCheck) Check() (warnings, errors []error) {
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klog.V(1).Infoln("validating the kernel module IPVS required exists in machine or not")
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kernelVersion, ipvsModules, err := GetKernelVersionAndIPVSMods(r.Executor)
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if err != nil {
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errors = append(errors, err)
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}
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// Find out loaded kernel modules
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out, err := r.Executor.Command("cut", "-f1", "-d", " ", "/proc/modules").CombinedOutput()
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if err != nil {
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errors = append(errors, fmt.Errorf("error getting installed ipvs required kernel modules: %v(%s)", err, out))
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return nil, errors
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}
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mods := strings.Split(string(out), "\n")
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wantModules := sets.NewString()
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loadModules := sets.NewString()
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wantModules.Insert(ipvsModules...)
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loadModules.Insert(mods...)
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modules := wantModules.Difference(loadModules).UnsortedList()
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// Check builtin modules exist or not
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if len(modules) != 0 {
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builtinModsFilePath := fmt.Sprintf("/lib/modules/%s/modules.builtin", kernelVersion)
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out, err := r.Executor.Command("cut", "-f1", "-d", " ", builtinModsFilePath).CombinedOutput()
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if err != nil {
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errors = append(errors, fmt.Errorf("error getting required builtin kernel modules: %v(%s)", err, out))
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return nil, errors
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}
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builtInModules := sets.NewString()
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for _, builtInMode := range ipvsModules {
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match, _ := regexp.Match(builtInMode+".ko", out)
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if !match {
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builtInModules.Insert(string(builtInMode))
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}
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}
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if len(builtInModules) != 0 {
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warnings = append(warnings, fmt.Errorf(
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"the IPVS proxier will not be used, because the following required kernel modules are not loaded: %v or no builtin kernel ipvs support: %v\n"+
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"you can solve this problem with following methods:\n 1. Run 'modprobe -- ' to load missing kernel modules;\n"+
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"2. Provide the missing builtin kernel ipvs support\n", modules, builtInModules))
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}
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}
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return warnings, errors
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}
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