Kubeadm安装Kubernetes环境
Kubeadm方式号称一键安装部署，很多人也试过并且顺利成功，可到了我这里因为折腾系统问题，倒腾出不少的坑出来。
- kubeadm好处是自动配置了必要的服务，以及缺省配置了安全的认证，etcd,apiserver,controller-manager,Schedule,kube-proxy都变成pod而非操作系统进程可以不断检测其状态并且进行迁移（能否迁移不确定）
- kubeadm上有很多组件配置直接拿来可用。
- 缺点是缺乏集群高可用模式，以及目前的定位是beta版。
[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.
- 准备工作
关掉selinux
vi /etc/selinux/config
disabled
关掉firewalld,iptables
systemctl disable firewalld
systemctl stop firewalld
systemctl disable iptables
systemctl stop iptables
先设置主机名
hostnamectl set-hostname k8s-
修改/etc/hosts文件
cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
:: localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.0.105 k8s-
192.168.0.106 k8s-
192.168.0.107 k8s-
修改网络配置成静态ip,然后
service network restart
- 安装docker,kubectl,kubelet,kubeadm
安装docker
yum install docker
验证docker version
[root@k8s-master1 ~]# service docker start
Redirecting to /bin/systemctl start docker.service
[root@k8s-master1 ~]# docker version
Client:
Version: 1.12.
API version: 1.24
Package version: docker-1.12.-.git85d7426.el7.centos.x86_64
Go version: go1.8.3
Git commit: 85d7426/1.12.
Built: Tue Oct ::
OS/Arch: linux/amd64 Server:
Version: 1.12.
API version: 1.24
Package version: docker-1.12.-.git85d7426.el7.centos.x86_64
Go version: go1.8.3
Git commit: 85d7426/1.12.
Built: Tue Oct ::
OS/Arch: linux/amd64
开机启动
[root@k8s-master1 ~]# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@k8s-master1 ~]# systemctl start docker
编辑生成kubernetes的yum源
[root@k8s- network-scripts]# cat /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=
gpgcheck=
安装kubelet,kubectl,kubenetes-cni,kubeadm，缺省安装的是1.7.5版本
yum install kubectl kubelet kubernetes-cni kubeadm
sysctl net.bridge.bridge-nf-call-iptables=1
如果需要安装其他版本，可以用yum remove移除
修改kubelet启动配置文件，主要是将--cgroup-driver改为cgroupfs（确保和/usr/lib/systemd/system/docker.service的用户一致就可以了，不需要修改！）
[root@k8s- bin]# cat /etc/systemd/system/kubelet.service.d/-kubeadm.conf
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--kubeconfig=/etc/kubernetes/kubelet.conf --require-kubeconfig=true"
Environment="KUBELET_SYSTEM_PODS_ARGS=--pod-manifest-path=/etc/kubernetes/manifests --allow-privileged=true"
Environment="KUBELET_NETWORK_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
Environment="KUBELET_DNS_ARGS=--cluster-dns=10.96.0.10 --cluster-domain=cluster.local"
Environment="KUBELET_AUTHZ_ARGS=--authorization-mode=Webhook --client-ca-file=/etc/kubernetes/pki/ca.crt"
Environment="KUBELET_CADVISOR_ARGS=--cadvisor-port=0"
Environment="KUBELET_CGROUP_ARGS=--cgroup-driver=cgroupfs"
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_SYSTEM_PODS_ARGS $KUBELET_NETWORK_ARGS $KUBELET_DNS_ARGS $KUBELET_AUTHZ_ARGS $KUBELET_CADVISOR_ARGS $KUBELET_CGROUP_ARGS $KUBELET_EXTRA_ARGS
启动docker和kubelet
systemctl enable docker
systemctl enable kubelet
systemctl start docker
systemctl start kubelet
- 下载镜像
在运行kubeadm之前，需要在本地先下载一系列images,这些images名称和版本，可以运行kubeadm init,然后中断运行得到
具体会生成在/etc/kubernetes/manifest目录下，通过grep命令可以列出，比如
cat etcd.yaml | grep gcr*
image: gcr.io/google_containers/etcd-amd64:3.0.
那具体需要下载哪些images和相应的版本呢？ 可以参照kubernetes kubeadm手册，具体地址
https://kubernetes.io/docs/admin/kubeadm/
这里就有比较清楚的版本和对应关系。
如何获取镜像
国内因为gcr.io被墙，所以要么通过代理翻墙获取，要么寻找其他办法。我的办法是访问
https://hub.docker.com/,然后搜索kube-apiserver-amd64,会列出各位大神已经build好的images
选择相应的版本，进行pull
docker pull cloudnil/etcd-amd64:3.0.
docker pull cloudnil/pause-amd64:3.0
docker pull cloudnil/kube-proxy-amd64:v1.7.2
docker pull cloudnil/kube-scheduler-amd64:v1.7.2
docker pull cloudnil/kube-controller-manager-amd64:v1.7.2
docker pull cloudnil/kube-apiserver-amd64:v1.7.2
docker pull cloudnil/kubernetes-dashboard-amd64:v1.6.1
docker pull cloudnil/k8s-dns-sidecar-amd64:1.14.
docker pull cloudnil/k8s-dns-kube-dns-amd64:1.14.
docker pull cloudnil/k8s-dns-dnsmasq-nanny-amd64:1.14. docker tag cloudnil/etcd-amd64:3.0. gcr.io/google_containers/etcd-amd64:3.0.
docker tag cloudnil/pause-amd64:3.0 gcr.io/google_containers/pause-amd64:3.0
docker tag cloudnil/kube-proxy-amd64:v1.7.2 gcr.io/google_containers/kube-proxy-amd64:v1.7.2
docker tag cloudnil/kube-scheduler-amd64:v1.7.2 gcr.io/google_containers/kube-scheduler-amd64:v1.7.2
docker tag cloudnil/kube-controller-manager-amd64:v1.7.2 gcr.io/google_containers/kube-controller-manager-amd64:v1.7.2
docker tag cloudnil/kube-apiserver-amd64:v1.7.2 gcr.io/google_containers/kube-apiserver-amd64:v1.7.2
docker tag cloudnil/kubernetes-dashboard-amd64:v1.6.1 gcr.io/google_containers/kubernetes-dashboard-amd64:v1.6.1
docker tag cloudnil/k8s-dns-sidecar-amd64:1.14. gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.
docker tag cloudnil/k8s-dns-kube-dns-amd64:1.14. gcr.io/google_containers/k8s-dns-kube-dns-amd64:1.14.
docker tag cloudnil/k8s-dns-dnsmasq-nanny-amd64:1.14. gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.
最后
[root@k8s- ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
gcr.io/google_containers/kube-apiserver-amd64 v1.7.2 25c5958099a8 months ago 186.1 MB
gcr.io/google_containers/kube-controller-manager-amd64 v1.7.2 83d607ba9358 months ago MB
gcr.io/google_containers/kube-scheduler-amd64 v1.7.2 6282cca6de74 months ago 77.18 MB
gcr.io/google_containers/kube-proxy-amd64 v1.7.2 69f8faa3d08d months ago 114.7 MB
gcr.io/google_containers/k8s-dns-kube-dns-amd64 1.14. 2d6a3bea02c4 months ago 49.38 MB
gcr.io/google_containers/k8s-dns-dnsmasq-nanny-amd64 1.14. 13117b1d461f months ago 41.41 MB
gcr.io/google_containers/k8s-dns-sidecar-amd64 1.14. c413c7235eb4 months ago 41.81 MB
gcr.io/google_containers/etcd-amd64 3.0. 393e48d05c4e months ago 168.9 MB
gcr.io/google_containers/kubernetes-dashboard-amd64 v1.6.1 c14ffb751676 months ago 134.4 MB
gcr.io/google_containers/pause-amd64 3.0 66c684b679d2 months ago 746.9 kB
- 主节点初始化
镜像准备完成，准备开始init
kubeadm init --kubernetes-version=v1.7.2 --pod-network-cidr=10.244.0.0/ --apiserver-advertise-address=0.0.0.0 --apiserver-cert-extra-sans=192.168.0.105,192.168.0.106,192.168.0.107,127.0.0.1,k8s-,k8s-,k8s-,192.168.0.1 --skip-preflight-checks
[root@k8s- network-scripts]# kubeadm init --kubernetes-version=v1.7.2 --pod-network-cidr=10.244.0.0/ --apiserver-advertise-address=0.0.0.0 --apiserver-cert-extra-sans=192.168.0.105,192.168.0.106,192.168.0.107,127.0.0.1,k8s-,k8s-,k8s-,192.168.0.1 --skip-preflight-checks
[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.
[init] Using Kubernetes version: v1.7.2
[init] Using Authorization modes: [Node RBAC]
[preflight] Skipping pre-flight checks
[kubeadm] WARNING: starting in 1.8, tokens expire after hours by default (if you require a non-expiring token use --token-ttl )
[certificates] Using the existing CA certificate and key.
[certificates] Using the existing API Server certificate and key.
[certificates] Using the existing API Server kubelet client certificate and key.
[certificates] Using the existing service account token signing key.
[certificates] Using the existing front-proxy CA certificate and key.
[certificates] Using the existing front-proxy client certificate and key.
[certificates] Valid certificates and keys now exist in "/etc/kubernetes/pki"
[kubeconfig] Using existing up-to-date KubeConfig file: "/etc/kubernetes/scheduler.conf"
[kubeconfig] Using existing up-to-date KubeConfig file: "/etc/kubernetes/admin.conf"
[kubeconfig] Using existing up-to-date KubeConfig file: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Using existing up-to-date KubeConfig file: "/etc/kubernetes/controller-manager.conf"
[apiclient] Created API client, waiting for the control plane to become ready
坑来了。。。卡在这一句上，通过journalctl看日志
journalctl -xeu kubelet > a
Oct :: k8s- systemd[]: Starting kubelet: The Kubernetes Node Agent...
-- Subject: Unit kubelet.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit kubelet.service has begun starting up.
Oct :: k8s- kubelet[]: I1030 ::30.326586 feature_gate.go:] feature gates: map[]
Oct :: k8s- kubelet[]: error: failed to run Kubelet: invalid kubeconfig: stat /etc/kubernetes/kubelet.conf: no such file or directory
Oct :: k8s- systemd[]: kubelet.service: main process exited, code=exited, status=/FAILURE
Oct :: k8s- systemd[]: Unit kubelet.service entered failed state.
Oct :: k8s- systemd[]: kubelet.service failed.
Oct :: k8s- systemd[]: kubelet.service holdoff time over, scheduling restart.
Oct :: k8s- systemd[]: Started kubelet: The Kubernetes Node Agent.
-- Subject: Unit kubelet.service has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit kubelet.service has finished starting up.
--
-- The start-up result is done.
Oct :: k8s- systemd[]: Starting kubelet: The Kubernetes Node Agent...
-- Subject: Unit kubelet.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit kubelet.service has begun starting up.
Oct :: k8s- kubelet[]: I1030 ::40.709684 feature_gate.go:] feature gates: map[]
Oct :: k8s- kubelet[]: I1030 ::40.712602 client.go:] Connecting to docker on unix:///var/run/docker.sock
Oct :: k8s- kubelet[]: I1030 ::40.712647 client.go:] Start docker client with request timeout=2m0s
Oct :: k8s- kubelet[]: W1030 ::40.714086 cni.go:] Unable to update cni config: No networks found in /etc/cni/net.d
Oct :: k8s- kubelet[]: I1030 ::40.725461 manager.go:] cAdvisor running in container: "/"
Oct :: k8s- kubelet[]: W1030 ::40.752809 manager.go:] unable to connect to Rkt api service: rkt: cannot tcp Dial rkt api service: dial tcp [::]:: getsockopt: connection refused
Oct :: k8s- kubelet[]: I1030 ::40.762789 fs.go:] Filesystem partitions: map[/dev/mapper/cl-root:{mountpoint:/ major: minor: fsType:xfs blockSize:} /dev/sda1:{mountpoint:/boot major: minor: fsType:xfs blockSize:}]
Oct :: k8s- kubelet[]: I1030 ::40.763579 manager.go:] Machine: {NumCores: CpuFrequency: MemoryCapacity: MachineID:a146a47b0c6b4c28a794c88309119e62 SystemUUID:B9DF3269-4A23-458F--21EC1D216DD4 BootID:62e18038-ea14-438f--e6a4abf265a1 Filesystems:[{Device:/dev/mapper/cl-root DeviceMajor: DeviceMinor: Capacity: Type:vfs Inodes: HasInodes:true} {Device:/dev/sda1 DeviceMajor: DeviceMinor: Capacity: Type:vfs Inodes: HasInodes:true}] DiskMap:map[::{Name:dm- Major: Minor: Size: Scheduler:none} ::{Name:dm- Major: Minor: Size: Scheduler:none} ::{Name:sda Major: Minor: Size: Scheduler:cfq} ::{Name:dm- Major: Minor: Size: Scheduler:none}] NetworkDevices:[{Name:enp0s3 MacAddress::::e2:ae:0a Speed: Mtu:} {Name:virbr0 MacAddress::::ed:: Speed: Mtu:} {Name:virbr0-nic MacAddress::::ed:: Speed: Mtu:}] Topology:[{Id: Memory: Cores:[{Id: Threads:[] Caches:[{Size: Type:Data Level:} {Size: Type:Instruction Level:} {Size: Type:Unified Level:}]}] Caches:[{Size: Type:Unified Level:}]}] CloudProvider:Unknown InstanceType:Unknown InstanceID:None}
Oct :: k8s- kubelet[]: I1030 ::40.765607 manager.go:] Version: {KernelVersion:3.10.-514.21..el7.x86_64 ContainerOsVersion:CentOS Linux (Core) DockerVersion:1.12. DockerAPIVersion:1.24 CadvisorVersion: CadvisorRevision:}
Oct :: k8s- kubelet[]: I1030 ::40.766218 server.go:] --cgroups-per-qos enabled, but --cgroup-root was not specified. defaulting to /
Oct :: k8s- kubelet[]: W1030 ::40.767731 container_manager_linux.go:] Running with swap on is not supported, please disable swap! This will be a fatal error by default starting in K8s v1.! In the meantime, you can opt-in to making this a fatal error by enabling --experimental-fail-swap-on.
Oct :: k8s- kubelet[]: I1030 ::40.767779 container_manager_linux.go:] container manager verified user specified cgroup-root exists: /
Oct :: k8s- kubelet[]: I1030 ::40.767789 container_manager_linux.go:] Creating Container Manager object based on Node Config: {RuntimeCgroupsName: SystemCgroupsName: KubeletCgroupsName: ContainerRuntime:docker CgroupsPerQOS:true CgroupRoot:/ CgroupDriver:cgroupfs ProtectKernelDefaults:false NodeAllocatableConfig:{KubeReservedCgroupName: SystemReservedCgroupName: EnforceNodeAllocatable:map[pods:{}] KubeReserved:map[] SystemReserved:map[] HardEvictionThresholds:[{Signal:memory.available Operator:LessThan Value:{Quantity:100Mi Percentage:} GracePeriod:0s MinReclaim:<nil>} {Signal:nodefs.available Operator:LessThan Value:{Quantity:<nil> Percentage:0.1} GracePeriod:0s MinReclaim:<nil>} {Signal:nodefs.inodesFree Operator:LessThan Value:{Quantity:<nil> Percentage:0.05} GracePeriod:0s MinReclaim:<nil>}]} ExperimentalQOSReserved:map[]}
Oct :: k8s- kubelet[]: I1030 ::40.767924 kubelet.go:] Adding manifest file: /etc/kubernetes/manifests
Oct :: k8s- kubelet[]: I1030 ::40.767935 kubelet.go:] Watching apiserver
Oct :: k8s- kubelet[]: E1030 ::40.782325 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Node: Get https://192.168.0.105:6443/api/v1/nodes?fieldSelector=metadata.name%3Dk8s-1&resourceVersion=0: dial tcp 192.168.0.105:6443: getsockopt: connection refused
Oct :: k8s- kubelet[]: E1030 ::40.782380 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Service: Get https://192.168.0.105:6443/api/v1/services?resourceVersion=0: dial tcp 192.168.0.105:6443: getsockopt: connection refused
Oct :: k8s- kubelet[]: E1030 ::40.782413 reflector.go:] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:: Failed to list *v1.Pod: Get https://192.168.0.105:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dk8s-1&resourceVersion=0: dial tcp 192.168.0.105:6443: getsockopt: connection refused
Oct :: k8s- kubelet[]: W1030 ::40.783607 kubelet_network.go:] Hairpin mode set to "promiscuous-bridge" but kubenet is not enabled, falling back to "hairpin-veth"
Oct :: k8s- kubelet[]: I1030 ::40.783625 kubelet.go:] Hairpin mode set to "hairpin-veth"
Oct :: k8s- kubelet[]: W1030 ::40.784179 cni.go:] Unable to update cni config: No networks found in /etc/cni/net.d
orks found in /etc/cni/net.d
Oct :: k8s- kubelet[]: W1030 ::40.784915 cni.go:] Unable to update cni config: No networks found in /etc/cni/net.d
Oct :: k8s- kubelet[]: W1030 ::40.793823 cni.go:] Unable to update cni config: No networks found in /etc/cni/net.d
Oct :: k8s- kubelet[]: I1030 ::40.793839 docker_service.go:] Docker cri networking managed by cni
Oct :: k8s- kubelet[]: I1030 ::40.798395 docker_service.go:] Setting cgroupDriver to cgroupfs
Oct :: k8s- kubelet[]: I1030 ::40.804276 remote_runtime.go:] Connecting to runtime service unix:///var/run/dockershim.sock
Oct :: k8s- kubelet[]: I1030 ::40.806221 kuberuntime_manager.go:] Container runtime docker initialized, version: 1.12., apiVersion: 1.24.
Oct :: k8s- kubelet[]: I1030 ::40.807620 server.go:] Started kubelet v1.7.5
Oct :: k8s- kubelet[]: E1030 ::40.808001 kubelet.go:] Image garbage collection failed once. Stats initialization may not have completed yet: unable to find data for container /
Oct :: k8s- kubelet[]: I1030 ::40.808008 kubelet_node_status.go:] Setting node annotation to enable volume controller attach/detach
Oct :: k8s- kubelet[]: I1030 ::40.808464 server.go:] Starting to listen on 0.0.0.0:
Oct :: k8s- kubelet[]: I1030 ::40.809166 server.go:] Adding debug handlers to kubelet server.
Oct :: k8s- kubelet[]: E1030 ::40.811544 event.go:] Unable to write event: 'Post https://192.168.0.105:6443/api/v1/namespaces/default/events: dial tcp 192.168.0.105:6443: getsockopt: connection refused' (may retry after sleeping)
Oct :: k8s- kubelet[]: E1030 ::40.818965 kubelet.go:] Failed to check if disk space is available for the runtime: failed to get fs info for "runtime": unable to find data for container /
Oct :: k8s- kubelet[]: E1030 ::40.818965 kubelet.go:] Failed to check if disk space is available on the root partition: failed to get fs info for "root": unable to find data for container /
Oct :: k8s- kubelet[]: I1030 ::40.826012 fs_resource_analyzer.go:] Starting FS ResourceAnalyzer
Oct :: k8s- kubelet[]: I1030 ::40.826058 status_manager.go:] Starting to sync pod status with apiserver
Oct :: k8s- kubelet[]: I1030 ::40.826130 kubelet.go:] Starting kubelet main sync loop.
Oct :: k8s- kubelet[]: I1030 ::40.826196 kubelet.go:] skipping pod synchronization - [container runtime is down PLEG is not healthy: pleg was last seen active 2562047h47m16.854775807s ago; threshold is 3m0s]
Oct :: k8s- kubelet[]: W1030 ::40.826424 container_manager_linux.go:] CPUAccounting not enabled for pid:
Oct :: k8s- kubelet[]: W1030 ::40.826429 container_manager_linux.go:] MemoryAccounting not enabled for pid:
Oct :: k8s- kubelet[]: W1030 ::40.826465 container_manager_linux.go:] CPUAccounting not enabled for pid:
Oct :: k8s- kubelet[]: W1030 ::40.826429 container_manager_linux.go:] MemoryAccounting not enabled for pid:
Oct :: k8s- kubelet[]: W1030 ::40.826465 container_manager_linux.go:] CPUAccounting not enabled for pid:
Oct :: k8s- kubelet[]: W1030 ::40.826468 container_manager_linux.go:] MemoryAccounting not enabled for pid:
Oct :: k8s- kubelet[]: E1030 ::40.826495 container_manager_linux.go:] [ContainerManager]: Fail to get rootfs information unable to find data for container /
Oct :: k8s- kubelet[]: I1030 ::40.826504 volume_manager.go:] Starting Kubelet Volume Manager
Oct :: k8s- kubelet[]: W1030 ::40.829827 cni.go:] Unable to update cni config: No networks found in /etc/cni/net.d
Oct :: k8s- kubelet[]: E1030 ::40.829892 kubelet.go:] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Oct :: k8s- kubelet[]: E1030 ::40.844934 factory.go:] devicemapper filesystem stats will not be reported: usage of thin_ls is disabled to preserve iops
Oct :: k8s- kubelet[]: I1030 ::40.845787 factory.go:] Registering Docker factory
看起来是cni初始化的问题，网上帖子一大堆，但解决方案都不work。
=============================================================================
反复折腾搞不定，觉得可能是自己的OS有问题，重新安装了个CentOS7.4,步骤一样，结果秒过，真的是崩溃啊，前面那个问题折腾了一天！
同时抄了个脚本，自动化一下镜像下载
images=(etcd-amd64:3.0. pause-amd64:3.0 kube-proxy-amd64:v1.7.2 kube-scheduler-amd64:v1.7.2 kube-controller-manager-amd64:v1.7.2 kube-apiserver-amd64:v1.7.2 kubernetes-dashboard-amd64:v1.6.1 k8s-dns-sidecar-amd64:1.14. k8s-dns-kube-dns-amd64:1.14. k8s-dns-dnsmasq-nanny-amd64:1.14.)
for imageName in ${images[@]} ; do
docker pull cloudnil/$imageName
docker tag cloudnil/$imageName gcr.io/google_containers/$imageName
docker rmi cloudnil/$imageName
done
[root@k8s- ~]# kubeadm init --kubernetes-version=v1.7.2 --pod-network-cidr=10.244.0.0/ --apiserver-advertise-address=0.0.0.0 --apiserver-cert-extra-sans=192.168.0.105,192.168.0.106,192.168.0.107,127.0.0.1,k8s-,k8s-,k8s-,192.168.0.1
[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.
[init] Using Kubernetes version: v1.7.2
[init] Using Authorization modes: [Node RBAC]
[preflight] Running pre-flight checks
[kubeadm] WARNING: starting in 1.8, tokens expire after hours by default (if you require a non-expiring token use --token-ttl )
[certificates] Generated CA certificate and key.
[certificates] Generated API server certificate and key.
[certificates] API Server serving cert is signed for DNS names [k8s- kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local k8s- k8s- k8s-] and IPs [192.168.0.105 192.168.0.106 192.168.0.107 127.0.0.1 192.168.0.1 10.96.0.1 192.168.0.105]
[certificates] Generated API server kubelet client certificate and key.
[certificates] Generated service account token signing key and public key.
[certificates] Generated front-proxy CA certificate and key.
[certificates] Generated front-proxy client certificate and key.
[certificates] Valid certificates and keys now exist in "/etc/kubernetes/pki"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"
[apiclient] Created API client, waiting for the control plane to become ready
[apiclient] All control plane components are healthy after 55.001211 seconds
[token] Using token: 22d578.d921a7cf51352441
[apiconfig] Created RBAC rules
[addons] Applied essential addon: kube-proxy
[addons] Applied essential addon: kube-dns Your Kubernetes master has initialized successfully! To start using your cluster, you need to run (as a regular user): mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
http://kubernetes.io/docs/admin/addons/ You can now join any number of machines by running the following on each node
as root: kubeadm join --token 22d578.d921a7cf51352441 192.168.0.105:
然后
export KUBECONFIG=/etc/kubernetes/admin.conf [root@k8s- ~]# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system etcd-k8s- / Running 5m
kube-system kube-apiserver-k8s- / Running 4m
kube-system kube-controller-manager-k8s- / Running 4m
kube-system kube-dns--j8mnw / Pending 5m
kube-system kube-proxy-6k4sb / Running 5m
kube-system kube-scheduler-k8s- / Running 4m
- 安装flanneld网络
启动kube-dns的服务无法启动，因为网络尚未配置。
配置flannel网络
在https://github.com/winse/docker-hadoop/tree/master/kube-deploy/kubeadm 中下载kube-flannel.yml和kube-flannel-rbac.yml
然后运行:
[root@k8s- ~]# kubectl apply -f kube-flannel.yml
serviceaccount "flannel" created
configmap "kube-flannel-cfg" created
daemonset "kube-flannel-ds" created
[root@k8s- ~]# kubectl apply -f kube-flannel-rbac.yml
clusterrole "flannel" created
clusterrolebinding "flannel" created
等待一段时间后pod启动，配置完成
[root@k8s- ~]# kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system etcd-k8s- / Running 3h
kube-system kube-apiserver-k8s- / Running 3h
kube-system kube-controller-manager-k8s- / Running 3h
kube-system kube-dns--j8mnw / Running 3h
kube-system kube-flannel-ds-j491k / Running 1h
kube-system kube-proxy-6k4sb / Running 3h
kube-system kube-scheduler-k8s- / Running 3h
节点
安装images
images=(pause-amd64:3.0 kube-proxy-amd64:v1.7.2)
for imageName in ${images[@]} ; do
docker pull cloudnil/$imageName
docker tag cloudnil/$imageName gcr.io/google_containers/$imageName
docker rmi cloudnil/$imageName
done
root@k8s- ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
gcr.io/google_containers/kube-proxy-amd64 v1.7.2 69f8faa3d08d months ago 114.7 MB
gcr.io/google_containers/pause-amd64 3.0 66c684b679d2 months ago 746.9 kB
加入集群
[root@k8s- ~]# kubeadm join --token 22d578.d921a7cf51352441 192.168.0.105:
[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.
[preflight] Running pre-flight checks
[discovery] Trying to connect to API Server "192.168.0.105:6443"
[discovery] Created cluster-info discovery client, requesting info from "https://192.168.0.105:6443"
[discovery] Cluster info signature and contents are valid, will use API Server "https://192.168.0.105:6443"
[discovery] Successfully established connection with API Server "192.168.0.105:6443"
[bootstrap] Detected server version: v1.7.2
[bootstrap] The server supports the Certificates API (certificates.k8s.io/v1beta1)
[csr] Created API client to obtain unique certificate for this node, generating keys and certificate signing request
[csr] Received signed certificate from the API server, generating KubeConfig...
[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf" Node join complete:
* Certificate signing request sent to master and response
received.
* Kubelet informed of new secure connection details. Run 'kubectl get nodes' on the master to see this machine join.
验证
[root@k8s- ~]# kubectl get nodes
NAME STATUS AGE VERSION
k8s- Ready 4h v1.7.5
k8s- Ready 1m v1.7.5
加入节点3后验证
[root@k8s- ~]# kubectl get nodes
NAME STATUS AGE VERSION
k8s- Ready 4h v1.7.5
k8s- Ready 5m v1.7.5
k8s- Ready 50s v1.7.5
[root@k8s- ~]# kubectl get pods -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE
etcd-k8s- / Running 4h 192.168.0.105 k8s-
kube-apiserver-k8s- / Running 4h 192.168.0.105 k8s-
kube-controller-manager-k8s- / Running 4h 192.168.0.105 k8s-
kube-dns--j8mnw / Running 4h 10.244.0.2 k8s-
kube-flannel-ds-d8vvr / Running 1m 192.168.0.107 k8s-
kube-flannel-ds-fgvr1 / Running 5m 192.168.0.106 k8s-
kube-flannel-ds-j491k / Running 1h 192.168.0.105 k8s-
kube-proxy-6k4sb / Running 4h 192.168.0.105 k8s-
kube-proxy-p6v69 / Running 5m 192.168.0.106 k8s-
kube-proxy-tk2jq / Running 1m 192.168.0.107 k8s-
kube-scheduler-k8s- / Running 4h 192.168.0.105 k8s-
- 建立一个dashborad
在三台机器上运行
images=(kubernetes-dashboard-amd64:v1.6.0)
for imageName in ${images[@]} ; do
docker pull k8scn/$imageName
docker tag k8scn/$imageName gcr.io/google_containers/$imageName
docker rmi k8scn/$imageName
done
然后再https://github.com/winse/docker-hadoop/tree/master/kube-deploy/kubeadm下载一个kubernetes-dashboard.yaml文件
root@k8s- ~]# kubectl create -f kubernetes-dashboard.yaml
serviceaccount "kubernetes-dashboard" created
clusterrolebinding "kubernetes-dashboard" created
deployment "kubernetes-dashboard" created
service "kubernetes-dashboard" created
[root@k8s- ~]# kubectl get pods -n kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE
etcd-k8s- / Running 4h 192.168.0.105 k8s-
kube-apiserver-k8s- / Running 4h 192.168.0.105 k8s-
kube-controller-manager-k8s- / Running 4h 192.168.0.105 k8s-
kube-dns--j8mnw / Running 4h 10.244.0.2 k8s-
kube-flannel-ds-d8vvr / Running 13m 192.168.0.107 k8s-
kube-flannel-ds-fgvr1 / Running 18m 192.168.0.106 k8s-
kube-flannel-ds-j491k / Running 2h 192.168.0.105 k8s-
kube-proxy-6k4sb / Running 4h 192.168.0.105 k8s-
kube-proxy-p6v69 / Running 18m 192.168.0.106 k8s-
kube-proxy-tk2jq / Running 13m 192.168.0.107 k8s-
kube-scheduler-k8s- / Running 4h 192.168.0.105 k8s-
kubernetes-dashboard--42k3c / Running 4s 10.244.2.2 k8s-
firefox上运行http://10.244.2.2:9090/,秒出这一大堆的Pods.
谢谢帮助我指引我爬坑的大神们:
http://www.cnblogs.com/liangDream/p/7358847.html
http://www.winseliu.com/blog/2017/08/13/kubeadm-install-k8s-on-centos7-with-resources/
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