k8s支持容器核绑定

找到应用对应的Pid，查看没有绑定到固定核上，而是在一个cpu池子里随机选。

[root@paasm1 ~]# cat cpu-ram.yaml
apiVersion: v1
kind: Pod
metadata:
  name: cpu-ram-demo
spec:
  containers:
  - name: cpu-ram-demo-container
    image: registry.paas/library/nginx:1.15.9
    resources:
      requests:
        memory: "200Mi"
        cpu: "2"
      limits:
        memory: "200Mi"
        cpu: "2"
    volumeMounts:
      - mountPath: /etc/work
        name: host5490
  volumes:
  - hostPath:
        path: /docker_temp
    name: host5490

[root@paasm1 ~]# kubectl create -f cpu-ram.yaml

[root@paasn4 ~]# docker ps|grep demo
9fe80681cc9d        8c9ca4d17702                              "nginx -g 'daemon of…"   25 seconds ago      Up 24 seconds                           k8s_cpu-ram-demo-container_cpu-ram-demo_default_380104ec-9bfc-11ea-a000-04bd7053eff0_0
ae41406867d7        registry.paas/cmss/pause-amd64:3.1        "/pause"                 26 seconds ago      Up 25 seconds                           k8s_POD_cpu-ram-demo_default_380104ec-9bfc-11ea-a000-04bd7053eff0_0
[root@paasn4 ~]# docker inspect 9fe80681cc9d|grep Pid
            "Pid": 118177,
            "PidMode": "",
            "PidsLimit": 0,
[root@paasn4 ~]# taskset -c -p 118177
pid 118177's current affinity list: 0-39

开启容器工作节点支持cpu核绑定特性：

[root@paasn4 ~]# kubectl delete -f cpu-ram.yaml
[root@paasn4 ~]# kubectl drain paasn4
[root@paasn4 ~]# systemctl stop kubelet
[root@paasn4 ~]# systemctl status kubelet
[root@paasn4 ~]# mv /dcos/kubelet/cpu_manager_state /dcos/kubelet/bak_cpu_manager_state
修改kubelet的启动参数，添加: --cpu-manager-policy=static 和 --kube-reserved=cpu=1（给cpu池子留点资源）
[root@paasn4 ~]# vim /etc/systemd/system/kubelet.service
[root@paasn4 ~]# systemctl daemon-reload
[root@paasn4 ~]# systemctl start kubelet
[root@paasn4 ~]# systemctl status kubelet
[root@paasn4 ~]# kubectl uncordon  paasn4

找到应用对应的Pid，查看已绑定到固定核上。

[root@paasn4 ~]# docker ps|grep demo
8da22cd45eda        8c9ca4d17702                              "nginx -g 'daemon of…"   23 seconds ago      Up 22 seconds                           k8s_cpu-ram-demo-container_cpu-ram-demo_default_ef1a0d28-9bfc-11ea-a000-04bd7053eff0_0
c81430f7ca4e        registry.paas/cmss/pause-amd64:3.1        "/pause"                 24 seconds ago      Up 22 seconds                           k8s_POD_cpu-ram-demo_default_ef1a0d28-9bfc-11ea-a000-04bd7053eff0_0
[root@paasn4 ~]# docker inspect 8da22cd45eda|grep Pid
            "Pid": 123203,
            "PidMode": "",
            "PidsLimit": 0,
[root@paasn4 ~]# taskset -c -p 123203
pid 123203's current affinity list: 1,21