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kube-controller-manager属于master节点组件,kube-controller-manager集群包含 3 个节点,启动后将通过竞争选举机制产生一个 leader 节点,其它节点为阻塞状态。当 leader 节点不可用后,剩余节点将再次进行选举产生新的 leader 节点,从而保证服务的高可用性。
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特别说明:这里所有的操作都是在devops这台机器上通过ansible工具执行;kube-controller-manager 在如下两种情况下使用证书:
#################### Variable parameter setting ######################
KUBE_NAME=kube-controller-manager
K8S_INSTALL_PATH=/data/apps/k8s/kubernetes
K8S_BIN_PATH=${K8S_INSTALL_PATH}/sbin
K8S_LOG_DIR=${K8S_INSTALL_PATH}/logs
K8S_CONF_PATH=/etc/k8s/kubernetes
KUBE_CONFIG_PATH=/etc/k8s/kubeconfig
CA_DIR=/etc/k8s/ssl
SOFTWARE=/root/software
VERSION=v1.14.2
PACKAGE="kubernetes-server-${VERSION}-linux-amd64.tar.gz"
DOWNLOAD_URL=“”https://github.com/devops-apps/download/raw/master/kubernetes/${PACKAGE}"
ETH_INTERFACE=eth2
LISTEN_IP=$(ifconfig | grep -A 1 ${ETH_INTERFACE} |grep inet |awk '{print $2}')
USER=k8s
SERVICE_CIDR=10.254.0.0/22
访问kubernetes github 官方地址下载稳定的 realease 包至本机;
wget $DOWNLOAD_URL -P $SOFTWARE
将kubernetes 软件包分发到各个master节点服务器;
sudo ansible master_k8s_vgs -m copy -a "src=${SOFTWARE}/$PACKAGE dest=${SOFTWARE}/" -b
### 1.Check if the install directory exists.
if [ ! -d "$K8S_BIN_PATH" ]; then
mkdir -p $K8S_BIN_PATH
fi
if [ ! -d "$K8S_LOG_DIR/$KUBE_NAME" ]; then
mkdir -p $K8S_LOG_DIR/$KUBE_NAME
fi
if [ ! -d "$K8S_CONF_PATH" ]; then
mkdir -p $K8S_CONF_PATH
fi
if [ ! -d "$KUBE_CONFIG_PATH" ]; then
mkdir -p $KUBE_CONFIG_PATH
fi
### 2.Install kube-apiserver binary of kubernetes.
if [ ! -f "$SOFTWARE/kubernetes-server-${VERSION}-linux-amd64.tar.gz" ]; then
wget $DOWNLOAD_URL -P $SOFTWARE >>/tmp/install.log 2>&1
fi
cd $SOFTWARE && tar -xzf kubernetes-server-${VERSION}-linux-amd64.tar.gz -C ./
cp -fp kubernetes/server/bin/$KUBE_NAME $K8S_BIN_PATH
ln -sf $K8S_BIN_PATH/$KUBE_NAM /usr/local/bin
chown -R $USER:$USER $K8S_INSTALL_PATH
chmod -R 755 $K8S_INSTALL_PATH
cd ${CA_DIR}
sudo ansible master_k8s_vgs -m copy -a "src=ca.pem dest=${CA_DIR}/" -b
sudo ansible master_k8s_vgs -m copy -a "src=ca-key.pem dest=${CA_DIR}/" -b
sudo ansible master_k8s_vgs -m copy -a \
"src=kubecontroller-manager.pem dest=${CA_DIR}/" -b
sudo ansible master_k8s_vgs -m copy -a \
"src=kubecontroller-manager-key.pem dest=${CA_DIR}/" -b
kube-controller-manager使用 kubeconfig文件连接访问 apiserver服务,该文件提供了 apiserver 地址、嵌入的 CA 证书和 kube-scheduler证书:
cd $KUBE_CONFIG_PATH
sudo ansible master_k8s_vgs -m copy -a \
"src=kube-controller-manager.kubeconfig dest=$KUBE_CONFIG_PATH/" -b
备注: 如果在前面小节已经同步过各组件kubeconfig和证书文件,此处可以不必执行此操作;
cat >/usr/lib/systemd/system/${KUBE_NAME}.service<
kube-controller-manager监听10252和10257端口,两个接口都对外提供 /metrics 和 /healthz 的访问。
sudo netstat -ntlp | grep kube-con
tcp 0 0 127.0.0.1:10252 0.0.0.0:* LISTEN 2450/kube-controlle
tcp 0 0 10.10.10.22:10257 0.0.0.0:* LISTEN 2450/kube-controlle
注意:很多安装文档都是关闭了非安全端口,将安全端口改为10250,这会导致查看集群状态是报如下错误,执行 kubectl get cs命令时,apiserver 默认向 127.0.0.1 发送请求。当controller-manager、scheduler以集群模式运行时,有可能和kube-apiserver不在一台机器上,且访问方式为https,则 controller-manager或scheduler 的状态为 Unhealthy,但实际上它们工作正常。则会导致上述error,但实际集群是安全状态;
kubectl get componentstatuses
NAME STATUS MESSAGE ERROR
controller-manager Unhealthy dial tcp 127.0.0.1:10252: connect: connection refused
scheduler Unhealthy dial tcp 127.0.0.1:10251: connect: connection refused
etcd-0 Healthy {"health":"true"}
etcd-2 Healthy {"health":"true"}
etcd-1 Healthy {"health":"true"}
正常输出应该为:
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-2 Healthy {"health":"true"}
etcd-1 Healthy {"health":"true"}
etcd-0 Healthy {"health":"true"}
查看服务是否运行
systemctl status kube-controller-manager|grep Active
确保状态为 active (running),否则查看日志,确认原因:
sudo journalctl -u kube-controller-manager
注意:以下命令在 kube-controller-manager 节点上执行。
https方式访问
curl -s --cacert /opt/k8s/work/ca.pem \
--cert /opt/k8s/work/admin.pem \
--key /opt/k8s/work/admin-key.pem \
https://10.10.10.22:10257/metrics |head
http方式访问
curl -s http://127.0.0.1:10252/metrics |head
ClusteRole system:kube-controller-manager 的权限很小,只能创建 secret、serviceaccount 等资源对象,各 controller 的权限分散到 ClusterRole system:controller:XXX 中:
$ kubectl describe clusterrole system:kube-controller-manager
Name: system:kube-controller-manager
Labels: kubernetes.io/bootstrapping=rbac-defaults
Annotations: rbac.authorization.kubernetes.io/autoupdate=true
PolicyRule:
Resources Non-Resource URLs Resource Names Verbs
--------- ----------------- -------------- -----
secrets [] [] [create delete get update]
endpoints [] [] [create get update]
serviceaccounts [] [] [create get update]
events [] [] [create patch update]
tokenreviews.authentication.k8s.io [] [] [create]
subjectacce***eviews.authorization.k8s.io [] [] [create]
configmaps [] [] [get]
namespaces [] [] [get]
*.* [] [] [list watch]
需要在kube-controller-manager的启动参数中添加"--use-service-account-credentials=true"参数,这样main controller将会为各controller创建对应的ServiceAccount XXX-controller。然后内置的 ClusterRoleBinding system:controller:XXX则将赋予各XXX-controller ServiceAccount对应的ClusterRole system:controller:XXX 权限。
$ kubectl get clusterrole|grep controller
system:controller:attachdetach-controller 17d
system:controller:certificate-controller 17d
system:controller:clusterrole-aggregation-controller 17d
system:controller:cronjob-controller 17d
system:controller:daemon-set-controller 17d
system:controller:deployment-controller 17d
system:controller:disruption-controller 17d
system:controller:endpoint-controller 17d
system:controller:expand-controller 17d
system:controller:generic-garbage-collector 17d
system:controller:horizontal-pod-autoscaler 17d
system:controller:job-controller 17d
system:controller:namespace-controller 17d
system:controller:node-controller 17d
system:controller:persistent-volume-binder 17d
system:controller:pod-garbage-collector 17d
system:controller:pv-protection-controller 17d
system:controller:pvc-protection-controller 17d
system:controller:replicaset-controller 17d
system:controller:replication-controller 17d
system:controller:resourcequota-controller 17d
system:controller:route-controller 17d
system:controller:service-account-controller 17d
system:controller:service-controller 17d
system:controller:statefulset-controller 17d
system:controller:ttl-controller 17d
system:kube-controller-manager 17d
以 deployment controller 为例:
$ kubectl describe clusterrole system:controller:deployment-controller
Name: system:controller:deployment-controller
Labels: kubernetes.io/bootstrapping=rbac-defaults
Annotations: rbac.authorization.kubernetes.io/autoupdate=true
PolicyRule:
Resources Non-Resource URLs Resource Names Verbs
--------- ----------------- -------------- -----
replicasets.apps [] [] [create delete get list patch update watch]
replicasets.extensions [] [] [create delete get list patch update watch]
events [] [] [create patch update]
pods [] [] [get list update watch]
deployments.apps [] [] [get list update watch]
deployments.extensions [] [] [get list update watch]
deployments.apps/finalizers [] [] [update]
deployments.apps/status [] [] [update]
deployments.extensions/finalizers[] [] [update]
deployments.extensions/status [] [] [update]
kubectl get endpoints kube-controller-manager --namespace=kube-system -o yaml
随机找一个或两个 master 节点,停掉kube-controller-manager服务,看其它节点是否获取了 leader 权限.
关于 controller 权限和 use-service-account-credentials 参数:
https://github.com/kubernetes/kubernetes/issues/48208
kubelet 认证和授权:
https://kubernetes.io/docs/admin/kubelet-authentication-authorization/#kubelet-authorization
安装完成kube-controller-manager后,还需要安装kube-scheduler,请参考:kubernetes集群安装指南:kube-scheduler组件集群部署。关于kube-controller-manager脚本请此处获取