【原创】k8s源码分析-----kubelet（7）containerRuntime

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本文QQ空间链接：http://user.qzone.qq.com/29185807/blog/1460533683

本文csdn博客链接：http://blog.csdn.net/screscent/article/details/51144087

源码为k8s v1.1.1稳定版本

2.6、containerRuntime

1、参数

代码在k8s.io\kubernetes\cmd\kubelet\app中

结构体变量

type KubeletServer struct {

...

PodInfraContainerImage string

RegistryPullQPS float64

RegistryBurst int

NetworkPluginDir string

NetworkPluginName string

DockerExecHandlerName string

CPUCFSQuota bool

// Pull images one at a time.

SerializeImagePulls bool

...

}

默认参数

func NewKubeletServer() *KubeletServer {

return &KubeletServer{

...

PodInfraContainerImage: dockertools.PodInfraContainerImage,

NetworkPluginDir: "/usr/libexec/kubernetes/kubelet-plugins/net/exec/",

NetworkPluginName: "",

DockerExecHandlerName: "native",

CPUCFSQuota: false,

SerializeImagePulls: true,

...

}

flag参数

func (s *KubeletServer) AddFlags(fs *pflag.FlagSet) {

...

fs.StringVar(&s.PodInfraContainerImage, "pod-infra-container-image", s.PodInfraContainerImage, "The image whose network/ipc namespaces containers in each pod will use.")

fs.Float64Var(&s.RegistryPullQPS, "registry-qps", s.RegistryPullQPS, "If > 0, limit registry pull QPS to this value. If 0, unlimited. [default=0.0]") fs.IntVar(&s.RegistryBurst, "registry-burst", s.RegistryBurst, "Maximum size of a bursty pulls, temporarily allows pulls to burst to this number, while still not exceeding registry-qps. Only used if --registry-qps > 0")

fs.StringVar(&s.NetworkPluginName, "network-plugin", s.NetworkPluginName, "<Warning: Alpha feature> The name of the network plugin to be invoked for various events in kubelet/pod lifecycle")

fs.StringVar(&s.NetworkPluginDir, "network-plugin-dir", s.NetworkPluginDir, "<Warning: Alpha feature> The full path of the directory in which to search for network plugins")

fs.StringVar(&s.DockerExecHandlerName, "docker-exec-handler", s.DockerExecHandlerName, "Handler to use when executing a command in a container. Valid values are 'native' and 'nsenter'. Defaults to 'native'.")

fs.BoolVar(&s.CPUCFSQuota, "cpu-cfs-quota", s.CPUCFSQuota, "Enable CPU CFS quota enforcement for containers that specify CPU limits")

fs.BoolVar(&s.SerializeImagePulls, "serialize-image-pulls", s.SerializeImagePulls, "Pull images one at a time. We recommend *not* changing the default value on nodes that run docker daemon with version < 1.9 or an Aufs storage backend. Issue #10959 has more details. [default=true]")

...

}

参数比较多。挑比较主要的说

PodInfraContainerImage：设置image镜像的下载地址，主要是防止被墙，设置私有的下载地址

RegistryPullQPS：限制拉取镜像个数，每秒最大的拉取个数

RegistryBurst：限制并发拉取的数量

NetworkPluginName：网络插件的名字

NetworkPluginDir：网络插件目录

DockerExecHandlerName：docker执行命令的方式，一般都是native