Kubernetes 控制平面组件

[TOC]

Kubernetes控制平面组件

Shell

# 进入容器内部，查看cgroup限制
docker inspect containerId
# 根据Cgroup查找到限制的路径
cd /sys/fs/cgroup
"CgroupParent": "kubepods-burstable-pod92e4430a_3409_4e54_b791_87245e7b00cb.slice"

# label设置
k get no --show-labels
k label no xxx xxx=xx

#replace是替换，apply是增量操作（旧数据可能还存在：比如，required替换preferred）
k replace -f xx.yaml
k apply -f xx.yaml

Kube-scheduler（调度）

调度器

predicates策略

predicates plugin工作原理

priorities策略

资源需求

resources:
  limits:
    memory: 1Gi
    cpu: 1
  requests:
    memory: 256Mi
    cpu: 100m

#上面配置的解读

# 下面配置（相对值）：抢cpu的时候，相对值
# noah @ noahLinux in /sys/fs/cgroup/cpu/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod92e4430a_3409_4e54_b791_87245e7b00cb.slice [21:02:26]
$ cat cpu.shares
102

# 下面的配置（绝对值）：解析上限时一个CPU
# noah @ noahLinux in /sys/fs/cgroup/cpu/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod92e4430a_3409_4e54_b791_87245e7b00cb.slice [21:03:00]
$ cat cpu.cfs_period_us
100000

# noah @ noahLinux in /sys/fs/cgroup/cpu/kubepods.slice/kubepods-burstable.slice/kubepods-burstable-pod92e4430a_3409_4e54_b791_87245e7b00cb.slice [21:03:14]
$ cat cpu.cfs_quota_us
100000