Kubernet（K8s）集群安装和检查
一、组件方式检查
1. Master节点：
2. Node 节点：
无
1. Master 节点：
root>> systemctl status etcd
root>> systemctl status kube-apiserver
root>> systemctl status kube-controller-manager
root>> systemctl status kube-scheduler
2. Node 节点
root>> systemctl status flanneld
root>> systemctl status kube-proxy
root>> systemctl status kubelet
root>> systemctl status docker
三、进程方式检查
1. Master 节点：
root>> ps -ef | grep etcd
root>> yum list installed | grep kube
2. Node 节点：
root>> ps -ef | grep flannel
root>> ps -ef | grep kube
四、安装包方式检查
1. Master 节点：
root>> yum list installed | grep etcd
root>> yum list installed | grep kube
2. Node 节点：
root>> yum list installed | grep flannel
root>> yum list installed | grep kube
五，附上第一次安装k8s集群失败后，后面重新安装k8s的一些环境重置的命令。
5.1 Master 节点
1. 卸载之前组件
[root@CNT7XDCK01 ~]# yum list installed | grep kube #首先查询组件
kubernetes-client.x86_64 1.5.2-0.7.git269f928.el7 @extras
kubernetes-master.x86_64 1.5.2-0.7.git269f928.el7 @extras
[root@CNT7XDCK01 ~]# yum remove -y kubernetes-client.x86_64
[root@CNT7XDCK01 ~]# yum remove -y kubernetes-master.x86_64
2. 重新安装组件
[root@CNT7XDCK01 ~]# yum -y install etcd
[root@CNT7XDCK01 ~]# yum -y install kubernetes-master
3. 配置相关kube的配置文件
编辑/etc/etcd/etcd.conf文件
1 2 3 4 | ETCD_NAME="default"ETCD_DATA_DIR="/var/lib/etcd/default.etcd"ETCD_LISTEN_CLIENT_URLS="http://0.0.0.0:2379"ETCD_ADVERTISE_CLIENT_URLS="http://localhost:2379" |
编辑/etc/kubernetes/apiserver文件
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #### kubernetes system config## The following values are used to configure the kube-apiserver## The address on the local server to listen to.KUBE_API_ADDRESS="--insecure-bind-address=0.0.0.0"# The port on the local server to listen on.KUBE_API_PORT="--port=8080"# Port minions listen onKUBELET_PORT="--kubelet-port=10250"# Comma separated list of nodes in the etcd clusterKUBE_ETCD_SERVERS="--etcd-servers=http://127.0.0.1:2379"# Address range to use for servicesKUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"# default admission control policies# KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota"KUBE_ADMISSION_CONTROL="--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ResourceQuota"# Add your own!KUBE_API_ARGS="" |
4. 重新注册/启动/检查：组件的系统服务
[root@CNT7XDCK01 ~]# systemctl enable etcd
[root@CNT7XDCK01 ~]# systemctl enable kube-apiserver
[root@CNT7XDCK01 ~]# systemctl enable kube-controller-manager
[root@CNT7XDCK01 ~]# systemctl enable kube-scheduler
[root@CNT7XDCK01 ~]# systemctl restart etcd
[root@CNT7XDCK01 ~]# systemctl restart kube-apiserver
[root@CNT7XDCK01 ~]# systemctl restart kube-controller-manager
[root@CNT7XDCK01 ~]# systemctl restart kube-scheduler
[root@CNT7XDCK01 ~]# systemctl status etcd
[root@CNT7XDCK01 ~]# systemctl status kube-apiserver
[root@CNT7XDCK01 ~]# systemctl status kube-controller-manager
[root@CNT7XDCK01 ~]# systemctl status kube-scheduler
====================================================================
5.2 Node 节点
1. 卸载之前组件
[root@CNT7XDCK02 ~]# yum list installed | grep kube
kubernetes-client.x86_64 1.5.2-0.7.git269f928.el7 @extras
kubernetes-node.x86_64 1.5.2-0.7.git269f928.el7 @extras
[root@CNT7XDCK02 ~]# yum remove -y kubernetes-client.x86_64
[root@CNT7XDCK02 ~]# yum remove -y kubernetes-node.x86_64
2. 重新安装组件
[root@CNT7XDCK02 ~]# yum -y install flannel
[root@CNT7XDCK02 ~]# yum -y install kubernetes-node
3. 配置相关kube的配置文件
修改/etc/sysconfig/flanneld文件
1 2 3 4 5 6 7 8 9 10 11 | # Flanneld configuration options # etcd url location. Point this to the server where etcd runsFLANNEL_ETCD_ENDPOINTS="http://192.168.3.96:2379"# etcd config key. This is the configuration key that flannel queries# For address range assignmentFLANNEL_ETCD_PREFIX="/atomic.io/network"# Any additional options that you want to pass#FLANNEL_OPTIONS="" |
修改/etc/kubernetes/config文件
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #### kubernetes system config## The following values are used to configure various aspects of all# kubernetes services, including## kube-apiserver.service# kube-controller-manager.service# kube-scheduler.service# kubelet.service# kube-proxy.service# logging to stderr means we get it in the systemd journalKUBE_LOGTOSTDERR="--logtostderr=true"# journal message level, 0 is debugKUBE_LOG_LEVEL="--v=0"# Should this cluster be allowed to run privileged docker containersKUBE_ALLOW_PRIV="--allow-privileged=false"# How the controller-manager, scheduler, and proxy find the apiserverKUBE_MASTER="--master=http://192.168.3.96:8080" |
修改/etc/kubernetes/kubelet文件
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #### kubernetes kubelet (minion) config# The address for the info server to serve on (set to 0.0.0.0 or "" for all interfaces)KUBELET_ADDRESS="--address=0.0.0.0"# The port for the info server to serve onKUBELET_PORT="--port=10250"# You may leave this blank to use the actual hostnameKUBELET_HOSTNAME="--hostname-override=192.168.3.97" # 这里是node机器的IP# location of the api-serverKUBELET_API_SERVER="--api-servers=http://192.168.3.96:8080" # 这里是master机器的IP# pod infrastructure containerKUBELET_POD_INFRA_CONTAINER="--pod-infra-container-image=registry.access.redhat.com/rhel7/pod-infrastructure:latest"# Add your own!KUBELET_ARGS="" |
4. 重新注册/启动/检查：组件的系统服务
[root@CNT7XDCK02 ~]# systemctl enable flanneld
[root@CNT7XDCK02 ~]# systemctl enable kube-proxy
[root@CNT7XDCK02 ~]# systemctl enable kubelet
[root@CNT7XDCK02 ~]# systemctl enable docker
[root@CNT7XDCK02 ~]# systemctl restart flanneld
[root@CNT7XDCK02 ~]# systemctl restart kube-proxy
[root@CNT7XDCK02 ~]# systemctl restart kubelet
[root@CNT7XDCK02 ~]# systemctl restart docker
[root@CNT7XDCK02 ~]# systemctl status flanneld
[root@CNT7XDCK02 ~]# systemctl status kube-proxy
[root@CNT7XDCK02 ~]# systemctl status kubelet
[root@CNT7XDCK02 ~]# systemctl status docker
六、最后，在Master机器，查看K8s安装结果
[root@CNT7XDCK01 ~]# kubectl get nodes
NAME STATUS AGE
192.168.3.100 Ready 35d
192.168.3.97 Ready 35d
192.168.3.98 Ready 35d
192.168.3.99 Ready 35d
如下，可以看到master拥有四个node节点机器，状态是Ready正常的。
