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Merge pull request #93931 from SataQiu/fix-kubelet-swap-20200812

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kubelet: assume that swap is disabled when /proc/swaps does not exist
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Kubernetes Prow Robot 2020-09-11 04:20:14 -07:00 committed by GitHub
commit 119c94214c
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1 changed files with 15 additions and 9 deletions
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24
pkg/kubelet/cm/container_manager_linux.go
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@ -215,17 +215,23 @@ func NewContainerManager(mountUtil mount.Interface, cadvisorInterface cadvisor.I
if failSwapOn {
// Check whether swap is enabled. The Kubelet does not support running with swap enabled.
swapData, err := ioutil.ReadFile("/proc/swaps")
swapFile := "/proc/swaps"
swapData, err := ioutil.ReadFile(swapFile)
if err != nil {
return nil, err
}
swapData = bytes.TrimSpace(swapData) // extra trailing \n
swapLines := strings.Split(string(swapData), "\n")
if os.IsNotExist(err) {
klog.Warningf("file %v does not exist, assuming that swap is disabled", swapFile)
} else {
return nil, err
}
} else {
swapData = bytes.TrimSpace(swapData) // extra trailing \n
swapLines := strings.Split(string(swapData), "\n")
// If there is more than one line (table headers) in /proc/swaps, swap is enabled and we should
// error out unless --fail-swap-on is set to false.
if len(swapLines) > 1 {
return nil, fmt.Errorf("running with swap on is not supported, please disable swap! or set --fail-swap-on flag to false. /proc/swaps contained: %v", swapLines)
// If there is more than one line (table headers) in /proc/swaps, swap is enabled and we should
// error out unless --fail-swap-on is set to false.
if len(swapLines) > 1 {
return nil, fmt.Errorf("running with swap on is not supported, please disable swap! or set --fail-swap-on flag to false. /proc/swaps contained: %v", swapLines)
}
}
}