| /* |
| Copyright 2018 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package util |
| |
| import ( |
| "crypto/sha1" |
| "encoding/hex" |
| ) |
| |
| // This file is a common place holder for volume limit utility constants |
| // shared between volume package and scheduler |
| |
| const ( |
| // EBSVolumeLimitKey resource name that will store volume limits for EBS |
| EBSVolumeLimitKey = "attachable-volumes-aws-ebs" |
| // EBSNitroLimitRegex finds nitro instance types with different limit than EBS defaults |
| EBSNitroLimitRegex = "^[cmr]5.*|t3|z1d" |
| // DefaultMaxEBSVolumes is the limit for volumes attached to an instance. |
| // Amazon recommends no more than 40; the system root volume uses at least one. |
| // See http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/volume_limits.html#linux-specific-volume-limits |
| DefaultMaxEBSVolumes = 39 |
| // DefaultMaxEBSNitroVolumeLimit is default EBS volume limit on m5 and c5 instances |
| DefaultMaxEBSNitroVolumeLimit = 25 |
| // AzureVolumeLimitKey stores resource name that will store volume limits for Azure |
| AzureVolumeLimitKey = "attachable-volumes-azure-disk" |
| // GCEVolumeLimitKey stores resource name that will store volume limits for GCE node |
| GCEVolumeLimitKey = "attachable-volumes-gce-pd" |
| |
| // CSIAttachLimitPrefix defines prefix used for CSI volumes |
| CSIAttachLimitPrefix = "attachable-volumes-csi-" |
| |
| // ResourceNameLengthLimit stores maximum allowed Length for a ResourceName |
| ResourceNameLengthLimit = 63 |
| ) |
| |
| // GetCSIAttachLimitKey returns limit key used for CSI volumes |
| func GetCSIAttachLimitKey(driverName string) string { |
| csiPrefixLength := len(CSIAttachLimitPrefix) |
| totalkeyLength := csiPrefixLength + len(driverName) |
| if totalkeyLength >= ResourceNameLengthLimit { |
| charsFromDriverName := driverName[:23] |
| hash := sha1.New() |
| hash.Write([]byte(driverName)) |
| hashed := hex.EncodeToString(hash.Sum(nil)) |
| hashed = hashed[:16] |
| return CSIAttachLimitPrefix + charsFromDriverName + hashed |
| } |
| return CSIAttachLimitPrefix + driverName |
| } |