forked from rook/rook
Arun Kumar Mohan
65d16bfc94
Fetched latest lib-bucket-provisioner changes as well. Signed-off-by: Arun Kumar Mohan <amohan@redhat.com>
335 lines
11 KiB
Go
335 lines
11 KiB
Go
/*
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Copyright 2017 The Rook Authors. All rights reserved.
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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 agent to manage Kubernetes storage attach events.
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package agent
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import (
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"context"
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"encoding/json"
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"os"
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"strconv"
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"strings"
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"github.com/coreos/pkg/capnslog"
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"github.com/pkg/errors"
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k8sutil "github.com/rook/rook/pkg/operator/k8sutil"
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apps "k8s.io/api/apps/v1"
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v1 "k8s.io/api/core/v1"
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k8serrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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)
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const (
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agentDaemonsetName = "rook-ceph-agent"
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flexvolumePathDirEnv = "FLEXVOLUME_DIR_PATH"
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libModulesPathDirEnv = "LIB_MODULES_DIR_PATH"
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agentMountsEnv = "AGENT_MOUNTS"
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flexvolumeDefaultDirPath = "/usr/libexec/kubernetes/kubelet-plugins/volume/exec/"
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agentDaemonsetPriorityClassNameEnv = "AGENT_PRIORITY_CLASS_NAME"
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agentDaemonsetTolerationEnv = "AGENT_TOLERATION"
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agentDaemonsetTolerationKeyEnv = "AGENT_TOLERATION_KEY"
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agentDaemonsetTolerationsEnv = "AGENT_TOLERATIONS"
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agentDaemonsetNodeAffinityEnv = "AGENT_NODE_AFFINITY"
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AgentMountSecurityModeEnv = "AGENT_MOUNT_SECURITY_MODE"
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RookEnableSelinuxRelabelingEnv = "ROOK_ENABLE_SELINUX_RELABELING"
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RookEnableFSGroupEnv = "ROOK_ENABLE_FSGROUP"
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// MountSecurityModeAny "any" security mode for the agent for mount action
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MountSecurityModeAny = "Any"
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// MountSecurityModeRestricted restricted security mode for the agent for mount action
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MountSecurityModeRestricted = "Restricted"
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)
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var (
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logger = capnslog.NewPackageLogger("github.com/rook/rook", "op-agent")
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)
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// New creates an instance of Agent
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func New(clientset kubernetes.Interface) *Agent {
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return &Agent{
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clientset: clientset,
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}
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}
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// Start the agent
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func (a *Agent) Start(namespace, agentImage, serviceAccount string) error {
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err := a.createAgentDaemonSet(namespace, agentImage, serviceAccount)
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if err != nil {
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return errors.Wrap(err, "error starting agent daemonset")
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}
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return nil
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}
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func (a *Agent) createAgentDaemonSet(namespace, agentImage, serviceAccount string) error {
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ctx := context.TODO()
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flexvolumeDirPath, source := a.discoverFlexvolumeDir()
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logger.Infof("discovered flexvolume dir path from source %s. value: %s", source, flexvolumeDirPath)
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libModulesDirPath := os.Getenv(libModulesPathDirEnv)
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if libModulesDirPath == "" {
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libModulesDirPath = "/lib/modules"
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}
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agentMountSecurityMode := os.Getenv(AgentMountSecurityModeEnv)
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if agentMountSecurityMode == "" {
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logger.Infof("no agent mount security mode given, defaulting to '%s' mode", MountSecurityModeAny)
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agentMountSecurityMode = MountSecurityModeAny
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}
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if agentMountSecurityMode != MountSecurityModeAny && agentMountSecurityMode != MountSecurityModeRestricted {
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return errors.Errorf("invalid agent mount security mode specified (given: %s)", agentMountSecurityMode)
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}
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rookEnableSelinuxRelabeling := os.Getenv(RookEnableSelinuxRelabelingEnv)
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_, err := strconv.ParseBool(rookEnableSelinuxRelabeling)
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if err != nil {
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logger.Warningf("Invalid %s value \"%s\". Defaulting to \"true\".", RookEnableSelinuxRelabelingEnv, rookEnableSelinuxRelabeling)
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rookEnableSelinuxRelabeling = "true"
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}
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rookEnableFSGroup := os.Getenv(RookEnableFSGroupEnv)
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_, err = strconv.ParseBool(rookEnableFSGroup)
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if err != nil {
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logger.Warningf("Invalid %s value \"%s\". Defaulting to \"true\".", RookEnableFSGroupEnv, rookEnableFSGroup)
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rookEnableFSGroup = "true"
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}
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privileged := true
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ds := &apps.DaemonSet{
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ObjectMeta: metav1.ObjectMeta{
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Name: agentDaemonsetName,
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},
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Spec: apps.DaemonSetSpec{
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Selector: &metav1.LabelSelector{
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MatchLabels: map[string]string{
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"app": agentDaemonsetName,
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},
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},
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UpdateStrategy: apps.DaemonSetUpdateStrategy{
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Type: apps.RollingUpdateDaemonSetStrategyType,
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},
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Template: v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: map[string]string{
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"app": agentDaemonsetName,
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},
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},
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Spec: v1.PodSpec{
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ServiceAccountName: serviceAccount,
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Containers: []v1.Container{
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{
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Name: agentDaemonsetName,
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Image: agentImage,
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Args: []string{"ceph", "agent"},
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SecurityContext: &v1.SecurityContext{
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Privileged: &privileged,
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},
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "flexvolume",
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MountPath: "/flexmnt",
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},
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{
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Name: "dev",
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MountPath: "/dev",
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},
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{
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Name: "sys",
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MountPath: "/sys",
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},
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{
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Name: "libmodules",
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MountPath: "/lib/modules",
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},
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},
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Env: []v1.EnvVar{
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k8sutil.NamespaceEnvVar(),
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k8sutil.NodeEnvVar(),
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{Name: AgentMountSecurityModeEnv, Value: agentMountSecurityMode},
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{Name: RookEnableSelinuxRelabelingEnv, Value: rookEnableSelinuxRelabeling},
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{Name: RookEnableFSGroupEnv, Value: rookEnableFSGroup},
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "flexvolume",
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VolumeSource: v1.VolumeSource{
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HostPath: &v1.HostPathVolumeSource{
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Path: flexvolumeDirPath,
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},
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},
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},
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{
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Name: "dev",
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VolumeSource: v1.VolumeSource{
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HostPath: &v1.HostPathVolumeSource{
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Path: "/dev",
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},
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},
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},
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{
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Name: "sys",
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VolumeSource: v1.VolumeSource{
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HostPath: &v1.HostPathVolumeSource{
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Path: "/sys",
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},
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},
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},
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{
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Name: "libmodules",
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VolumeSource: v1.VolumeSource{
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HostPath: &v1.HostPathVolumeSource{
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Path: libModulesDirPath,
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},
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},
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},
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},
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HostNetwork: true,
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PriorityClassName: os.Getenv(agentDaemonsetPriorityClassNameEnv),
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},
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},
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},
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}
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// Add agent mounts if any given through environment
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agentMounts := os.Getenv(agentMountsEnv)
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if agentMounts != "" {
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mounts := strings.Split(agentMounts, ",")
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for _, mount := range mounts {
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mountdef := strings.Split(mount, "=")
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if len(mountdef) != 2 {
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return errors.Errorf("badly formatted AGENT_MOUNTS %q. The format should be 'mountname=/host/path:/container/path,mountname2=/host/path2:/container/path2'", agentMounts)
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}
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mountname := mountdef[0]
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paths := strings.Split(mountdef[1], ":")
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if len(paths) != 2 {
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return errors.Errorf("badly formatted AGENT_MOUNTS %q. The format should be 'mountname=/host/path:/container/path,mountname2=/host/path2:/container/path2'", agentMounts)
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}
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ds.Spec.Template.Spec.Containers[0].VolumeMounts = append(ds.Spec.Template.Spec.Containers[0].VolumeMounts, v1.VolumeMount{
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Name: mountname,
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MountPath: paths[1],
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})
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ds.Spec.Template.Spec.Volumes = append(ds.Spec.Template.Spec.Volumes, v1.Volume{
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Name: mountname,
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VolumeSource: v1.VolumeSource{
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HostPath: &v1.HostPathVolumeSource{
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Path: paths[0],
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},
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},
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})
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}
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}
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// Add toleration if any
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tolerationValue := os.Getenv(agentDaemonsetTolerationEnv)
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if tolerationValue != "" {
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ds.Spec.Template.Spec.Tolerations = []v1.Toleration{
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{
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Effect: v1.TaintEffect(tolerationValue),
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Operator: v1.TolerationOpExists,
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Key: os.Getenv(agentDaemonsetTolerationKeyEnv),
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},
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}
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}
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tolerationsRaw := os.Getenv(agentDaemonsetTolerationsEnv)
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tolerations, err := k8sutil.YamlToTolerations(tolerationsRaw)
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if err != nil {
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logger.Warningf("failed to parse %q. %v", tolerationsRaw, err)
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}
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ds.Spec.Template.Spec.Tolerations = append(ds.Spec.Template.Spec.Tolerations, tolerations...)
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// Add NodeAffinity if any
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nodeAffinity := os.Getenv(agentDaemonsetNodeAffinityEnv)
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if nodeAffinity != "" {
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v1NodeAffinity, err := k8sutil.GenerateNodeAffinity(nodeAffinity)
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if err != nil {
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logger.Errorf("failed to create NodeAffinity. %v", err)
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} else {
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ds.Spec.Template.Spec.Affinity = &v1.Affinity{
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NodeAffinity: v1NodeAffinity,
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}
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}
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}
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_, err = a.clientset.AppsV1().DaemonSets(namespace).Create(ctx, ds, metav1.CreateOptions{})
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if err != nil {
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if !k8serrors.IsAlreadyExists(err) {
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return errors.Wrap(err, "failed to create rook-ceph-agent daemon set")
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}
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logger.Infof("rook-ceph-agent daemonset already exists, updating ...")
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_, err = a.clientset.AppsV1().DaemonSets(namespace).Update(ctx, ds, metav1.UpdateOptions{})
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if err != nil {
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return errors.Wrap(err, "failed to update rook-ceph-agent daemon set")
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}
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} else {
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logger.Infof("rook-ceph-agent daemonset started")
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}
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return nil
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}
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func (a *Agent) discoverFlexvolumeDir() (flexvolumeDirPath, source string) {
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ctx := context.TODO()
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//copy flexvolume to flexvolume dir
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nodeName := os.Getenv(k8sutil.NodeNameEnvVar)
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if nodeName == "" {
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logger.Warningf("cannot detect the node name. Please provide using the downward API in the rook operator manifest file")
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return getDefaultFlexvolumeDir()
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}
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// determining where the path of the flexvolume dir on the node
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nodeConfigURI, err := k8sutil.NodeConfigURI()
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if err != nil {
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logger.Warning(err.Error())
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return getDefaultFlexvolumeDir()
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}
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nodeConfig, err := a.clientset.CoreV1().RESTClient().Get().RequestURI(nodeConfigURI).DoRaw(ctx)
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if err != nil {
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logger.Warningf("unable to query node configuration: %v", err)
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return getDefaultFlexvolumeDir()
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}
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// unmarshal to a KubeletConfiguration
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kubeletConfiguration := KubeletConfiguration{}
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if err := json.Unmarshal(nodeConfig, &kubeletConfiguration); err != nil {
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logger.Warningf("unable to parse node config as kubelet configuration. %v", err)
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} else {
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flexvolumeDirPath = kubeletConfiguration.KubeletConfig.VolumePluginDir
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}
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if flexvolumeDirPath != "" {
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return flexvolumeDirPath, "KubeletConfiguration"
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}
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return getDefaultFlexvolumeDir()
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}
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func getDefaultFlexvolumeDir() (flexvolumeDirPath, source string) {
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logger.Infof("getting flexvolume dir path from %s env var", flexvolumePathDirEnv)
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flexvolumeDirPath = os.Getenv(flexvolumePathDirEnv)
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if flexvolumeDirPath != "" {
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return flexvolumeDirPath, "env var"
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}
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logger.Infof("flexvolume dir path env var %s is not provided. Defaulting to: %s",
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flexvolumePathDirEnv, flexvolumeDefaultDirPath)
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flexvolumeDirPath = flexvolumeDefaultDirPath
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return flexvolumeDirPath, "default"
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}
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