mirror of https://github.com/k3d-io/k3d
[FEATURE] Memory Limits (#494, @konradmalik)
Konrad Malik
3 years ago
committed by
GitHub
parent
16fa1076ff
commit
e495fe83a8
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/* |
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Copyright © 2020 The k3d Author(s) |
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|
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Permission is hereby granted, free of charge, to any person obtaining a copy |
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of this software and associated documentation files (the "Software"), to deal |
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in the Software without restriction, including without limitation the rights |
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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copies of the Software, and to permit persons to whom the Software is |
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furnished to do so, subject to the following conditions: |
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|
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The above copyright notice and this permission notice shall be included in |
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all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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THE SOFTWARE. |
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*/ |
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package util |
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import ( |
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"fmt" |
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"os" |
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"path" |
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"strings" |
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dockerunits "github.com/docker/go-units" |
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log "github.com/sirupsen/logrus" |
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) |
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const ( |
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EdacFolderPath = "/sys/devices/system/edac" |
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MemInfoPath = "/proc/meminfo" |
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) |
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// creates a mininal fake meminfo with fields required by cadvisor (see machine.go in cadvisor)
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func meminfoContent(totalKB int64) string { |
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var lines = []string{ |
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fmt.Sprintf("MemTotal: %d kB", totalKB), |
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// this may be configurable later
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"SwapTotal: 0 kB", |
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} |
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return strings.Join(lines, "\n") |
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} |
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// GetNodeFakerDirOrCreate creates or gets a hidden folder in k3d home dir
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// to keep container(node)-specific fake files in it
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func GetNodeFakerDirOrCreate(name string) (string, error) { |
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// this folder needs to be kept across reboots, keep it in ~/.k3d
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configdir, err := GetConfigDirOrCreate() |
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if err != nil { |
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return "", err |
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} |
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fakeDir := path.Join(configdir, fmt.Sprintf(".%s", name)) |
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// create directories if necessary
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if err := createDirIfNotExists(fakeDir); err != nil { |
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log.Errorf("Failed to create fake files path '%s'", fakeDir) |
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return "", err |
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} |
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return fakeDir, nil |
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} |
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// GetFakeMeminfoPathForName returns a path to (existent or not) fake meminfo file for a given node/container name
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func GetFakeMeminfoPathForName(nodeName string) (string, error) { |
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return fakeInfoPathForName("meminfo", nodeName) |
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} |
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// MakeFakeMeminfo creates a fake meminfo file to be mounted and provide a specific RAM capacity.
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// This file is created on a per specific container/node basis, uniqueName must ensure that.
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// Returns a path to the file
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func MakeFakeMeminfo(memoryBytes int64, nodeName string) (string, error) { |
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fakeMeminfoPath, err := GetFakeMeminfoPathForName(nodeName) |
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if err != nil { |
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return "", err |
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} |
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fakememinfo, err := os.Create(fakeMeminfoPath) |
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defer fakememinfo.Close() |
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if err != nil { |
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return "", err |
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} |
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// write content, must be kB
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memoryKb := memoryBytes / dockerunits.KB |
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content := meminfoContent(memoryKb) |
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_, err = fakememinfo.WriteString(content) |
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if err != nil { |
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return "", err |
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} |
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return fakememinfo.Name(), nil |
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} |
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// MakeFakeEdac creates an empty edac folder to force cadvisor
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// to use meminfo even for ECC memory
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func MakeFakeEdac(nodeName string) (string, error) { |
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dir, err := GetNodeFakerDirOrCreate(nodeName) |
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if err != nil { |
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return "", err |
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} |
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edacPath := path.Join(dir, "edac") |
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// create directories if necessary
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if err := createDirIfNotExists(edacPath); err != nil { |
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log.Errorf("Failed to create fake edac path '%s'", edacPath) |
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return "", err |
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} |
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return edacPath, nil |
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} |
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// returns a path to (existent or not) fake (mem or cpu)info file for a given node/container name
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func fakeInfoPathForName(infoType string, nodeName string) (string, error) { |
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// this file needs to be kept across reboots, keep it in ~/.k3d
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dir, err := GetNodeFakerDirOrCreate(nodeName) |
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if err != nil { |
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return "", err |
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} |
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return path.Join(dir, infoType), nil |
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} |
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