本篇文章为大家展示了k8s cpu limit node节点异常 怎么办,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
日志信息:
OCI runtime create failed: container_linux.go:348: starting container process caused "process_linux.go:402: container init caused \"process_linux.go:367: setting cgroup config for procHooks process caused \\\"failed to write 100000 to cpu.cfs_period_us: write /sys/fs/cgroup/cpu,cpuacct/kubepods/burstable/pod0f117614-9bae-11e9-b422-525400530fa1/fa79711ac936f4650b00bab66e21f5efb64fac642aa38e9c314385ab4023b484/cpu.cfs_period_us: invalid argument\\\"\"": unknown
从日志信息描述来看:cgroup cput 参数:cpu.cfs_period_us: invalid argument\\\"\"": unknown 有问题!
参数文件目录:/sys/fs/cgroup/cpu,cpuacct/kubepods/burstable/pod0f117614-9bae-11e9-b422-525400530fa1/fa79711ac936f4650b00bab66e21f5efb64fac642aa38e9c314385ab4023b484/cpu.cfs_period_us
具体原因导致未知!
出现的症状:
新调度过来的pod起步来了,报上面那个错误,以前的pod好像没有问题
https://my.oschina.net/xiaominmin/blog/3068378
https://kubernetes.io/zh/docs/tasks/administer-cluster/cpu-management-policies/
https://qingwave.github.io/2019/01/09/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3K8s%E8%B5%84%E6%BA%90%E9%99%90%E5%88%B6/#%E5%86%85%E5%AD%98%E9%99%90%E5%88%B6
https://www.yangcs.net/posts/understanding-resource-limits-in-kubernetes-cpu-time/
原因:内核问题
解决:node 执行脚本
#/usr/bin/python2 """Fixs a CFS bug in Container-optimized OS (COS) nodes. The bug is described at: https://docs.google.com/document/d/13KLD__6A935igLXpTFFomqfclATC89nAkhPOxsuKA0I/edit# Examples: To check script sanity in COS VM: sudo python fix-cfs.py --dry_run To fix cfs bug in COS VM: sudo python fix-cfs.py When running in a container/DaemonSet: sudo python fix-cfs.py --sys=/host/sys --dry_run sudo python fix-cfs.py --sys=/host/sys sudo python fix-cfs.py --sys=/host/sys --interval=10 """ from __future__ import print_function import argparse import math import os import time def _ParseCommandLine(): parser = argparse.ArgumentParser(description='Fix cfs bug.') parser.add_argument('--dry_run', dest='dry_run', action='store_true', help='Whether or not to run in dry_run mode') parser.set_defaults(dry_run=False) parser.add_argument('--sys', type=str, default='/sys', help='The root directory of the /sys fs') parser.add_argument('--interval', type=int, help='Seconds to wait between invocations') return parser.parse_args() def ReadFile(directory, filename): with open(os.path.join(directory, filename), 'r') as f: return f.read() def WriteFile(directory, filename, number): with open(os.path.join(directory, filename), 'w') as f: f.write('%d' % number) def ListSubdirs(directory): return [ os.path.join(directory, f) for f in os.listdir(directory) if os.path.isdir(os.path.join(directory, f)) ] def CalculateNewQuotaPeriodForPod(quota, period): scaled_times = math.ceil( (math.log(period) - math.log(100000)) / (math.log(147) - math.log(128))) new_period = 100000 new_quota = math.floor( quota * math.pow(128.0 / 147, scaled_times)) + 1 + scaled_times return new_quota, new_period def CalculateNewQuotaPeriodForContainer(quota, period): scaled_times = math.ceil( (math.log(period) - math.log(100000)) / (math.log(147) - math.log(128))) new_period = 100000 new_quota = math.floor(quota * math.pow(128.0 / 147, scaled_times)) new_quota = max(new_quota, 1000) return new_quota, new_period def FixPodIfAffected(pod_dir, dry_run): try: quota = long(ReadFile(pod_dir, 'cpu.cfs_quota_us')) period = long(ReadFile(pod_dir, 'cpu.cfs_period_us')) except IOError: print('Skipping pod_dir %s. The pod may have disappeared from cfs before', ' it could be examined' % (pod_dir)) return if quota <= 0 or period <= 0: return if period <= 100000: return print('Found a problem:') print('pod %s has quota %d, period %d' % (pod_dir, quota, period)) new_quota, new_period = CalculateNewQuotaPeriodForPod(quota, period) if dry_run: print('dry_run: would fix pod %s with quota %d, period %d' % (pod_dir, new_quota, new_period)) return try: WriteFile(pod_dir, 'cpu.cfs_period_us', new_period) WriteFile(pod_dir, 'cpu.cfs_quota_us', new_quota) print('fixed pod %s with quota %d, period %d' % (pod_dir, new_quota, new_period)) except IOError: print('Warning: failed to fix cfs at pod_dir %s, ', 'the directory may have disappeared.') return def FixContainerIfAffected(container_dir, dry_run): try: quota = long(ReadFile(container_dir, 'cpu.cfs_quota_us')) period = long(ReadFile(container_dir, 'cpu.cfs_period_us')) except IOError: print('Skipping container_dir %s. The container may have disappeared from', ' cfs before it could be examined' % (container_dir)) return if quota <= 0 or period <= 0: return if period <= 100000: return print('Found a problem:') print('container %s has quota %d, period %d' % (container_dir, quota, period)) new_quota, new_period = CalculateNewQuotaPeriodForContainer(quota, period) if dry_run: print('dry_run: would fix container %s with quota %d, period %d' % (container_dir, new_quota, new_period)) return try: WriteFile(container_dir, 'cpu.cfs_quota_us', new_quota) WriteFile(container_dir, 'cpu.cfs_period_us', new_period) print('fixed container %s with quota %d, period %d' % (container_dir, new_quota, new_period)) except IOError: print('Warning: failed to fix cfs at container_dir %s, ', 'the directory may have disappeared.') return def FixAllPods(sysfs='/sys', dry_run=True): pods_dir = os.path.join(sysfs, 'fs/cgroup/cpu/kubepods/burstable') pod_dirs = ListSubdirs(pods_dir) for pod_dir in pod_dirs: FixPodIfAffected(pod_dir, dry_run) container_dirs = ListSubdirs(pod_dir) for container_dir in container_dirs: FixContainerIfAffected(container_dir, dry_run) def main(): args = _ParseCommandLine() while True: FixAllPods(sysfs=args.sys, dry_run=args.dry_run) if args.interval: time.sleep(args.interval) else: break if __name__ == '__main__': main()
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