kubernetes v1.11.2 源码安装（四）之master节点安装


安装高版本以及自动化安装，可参考视频，参考这里

 

kubernetes master 节点包含的组件：

  • kube-apiserver
  • kube-scheduler
  • kube-controller-manager

目前这三个组件需要部署在同一台机器上。

  • kube-scheduler、kube-controller-manager 和 kube-apiserver 三者的功能紧密相关；
  • 同时只能有一个 kube-scheduler、kube-controller-manager 进程处于工作状态，如果运行多个，则需要通过选举产生一个 leader；

 

①、首先确认第一步创建的证书文件

$ ls /etc/kubernetes/ssl
admin-key.pem  admin.pem  ca-key.pem  ca.pem  kube-proxy-key.pem  kube-proxy.pem  kubernetes-key.pem  kubernetes.pem

 

②、下载二进制文件

方式一

wget https://github.com/kubernetes/kubernetes/releases/download/v1.11.2/kubernetes.tar.gz
tar -xzvf kubernetes.tar.gz
cd kubernetes
./cluster/get-kube-binaries.sh


方式二

从 CHANGELOG页面 (https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG.md)下载 kubernetes-server-linux-amd64.tar.gz 文件

wget https://storage.googleapis.com/kubernetes-release/release/v1.11.2/kubernetes-server-linux-amd64.tar.gz
tar -xzvf kubernetes-server-linux-amd64.tar.gz
cd kubernetes
tar -xzvf  kubernetes-src.tar.gz


//将二进制文件拷贝到指定路径
cp -r server/bin/{kube-apiserver,kube-controller-manager,kube-scheduler,kubectl,kube-proxy,kubelet} /usr/local/bin/

 

配置和启动 kube-apiserver

创建 kube-apiserver的service配置文件

 

service配置文件/usr/lib/systemd/system/kube-apiserver.service内容：

[root@bogon ~]# cat /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Service
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
After=etcd.service

[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/apiserver
ExecStart=/usr/local/bin/kube-apiserver \
        $KUBE_LOGTOSTDERR \
        $KUBE_LOG_LEVEL \
        $KUBE_ETCD_SERVERS \
        $KUBE_API_ADDRESS \
        $KUBE_API_PORT \
        $KUBELET_PORT \
        $KUBE_ALLOW_PRIV \
        $KUBE_SERVICE_ADDRESSES \
        $KUBE_ADMISSION_CONTROL \
        $KUBE_API_ARGS
Restart=on-failure
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

 

/etc/kubernetes/config文件的内容为：

[root@bogon ~]# cat /etc/kubernetes/config

# logging to stderr means we get it in the systemd journal
KUBE_LOGTOSTDERR="--logtostderr=true"

# journal message level, 0 is debug
KUBE_LOG_LEVEL="--v=0"

# Should this cluster be allowed to run privileged docker containers
KUBE_ALLOW_PRIV="--allow-privileged=true"

# How the controller-manager, scheduler, and proxy find the apiserver
KUBE_MASTER="--master=http://10.10.10.11:8080"

该配置文件同时被kube-apiserver、kube-controller-manager、kube-scheduler、kubelet、kube-proxy使用。

 

apiserver配置文件/etc/kubernetes/apiserver内容为：

[root@bogon ~]# cat /etc/kubernetes/apiserver

## The address on the local server to listen to.

KUBE_API_ADDRESS="--advertise-address=10.10.10.11 --bind-address=10.10.10.11 --insecure-bind-address=0.0.0.0"  #最后一项写成10.x.x.x 会报；连接不上8080的错误
#
## The port on the local server to listen on.
#KUBE_API_PORT="--port=8080"
#
## Port minions listen on
#KUBELET_PORT="--kubelet-port=10250"
#
## Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=https://10.10.10.11:2379,https://10.10.10.12:2379,https://10.10.10.162:2379"
#
## Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
#
## default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=ServiceAccount,NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
#
## Add your own!
KUBE_API_ARGS="--authorization-mode=RBAC,Node --runtime-config=rbac.authorization.k8s.io/v1beta1 --kubelet-https=true --enable-bootstrap-token-auth  --token-auth-file=/etc/kubernetes/token.csv --service-node-port-range=30000-32767 --tls-cert-file=/etc/kubernetes/ssl/kubernetes.pem --tls-private-key-file=/etc/kubernetes/ssl/kubernetes-key.pem --client-ca-file=/etc/kubernetes/ssl/ca.pem --service-account-key-file=/etc/kubernetes/ssl/ca-key.pem --etcd-cafile=/etc/kubernetes/ssl/ca.pem --etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem --etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem --enable-swagger-ui=true --apiserver-count=3 --audit-log-maxage=30 --audit-log-maxbackup=3 --audit-log-maxsize=100 --audit-log-path=/var/lib/audit.log --event-ttl=1h"

 

以上配置说明：

--experimental-bootstrap-token-auth Bootstrap Token Authentication在1.9版本已经变成了正式feature，参数名称改为 --enable-bootstrap-token-auth

如果中途修改过--service-cluster-ip-range地址，则必须将default命名空间的kubernetes的service给删除，使用命令：kubectl delete service kubernetes，然后系统会自动用新的ip重建这个service，不然apiserver的log有报错the cluster IP x.x.x.x for service kubernetes/default is not within the service CIDR x.x.x.x/16; please recreate

--authorization-mode=RBAC 指定在安全端口使用 RBAC 授权模式，拒绝未通过授权的请求；

kube-scheduler、kube-controller-manager 一般和 kube-apiserver 部署在同一台机器上，它们使用非安全端口和 kube-apiserver通信;

kubelet、kube-proxy、kubectl 部署在其它 Node 节点上，如果通过安全端口访问 kube-apiserver，则必须先通过 TLS 证书认证，再通过 RBAC 授权； kube-proxy、kubectl 通过在使用的证书里指定相关的 User、Group 来达到通过 RBAC 授权的目的；

如果使用了 kubelet TLS Boostrap 机制，则不能再指定 --kubelet-certificate-authority、--kubelet-client-certificate 和 --kubelet-client-key 选项，否则后续 kube-apiserver 校验 kubelet 证书时出现 ”x509: certificate signed by unknown authority“ 错误；

--admission-control 值必须包含 ServiceAccount；

--bind-address 不能为 127.0.0.1；

runtime-config配置为rbac.authorization.k8s.io/v1beta1，表示运行时的apiVersion；

--service-cluster-ip-range 指定 Service Cluster IP 地址段，该地址段不能路由可达；

缺省情况下 kubernetes 对象保存在 etcd /registry 路径下，可以通过 --etcd-prefix 参数进行调整；

如果需要开通http的无认证的接口，则可以增加以下两个参数：--insecure-port=8080 --insecure-bind-address=127.0.0.1。注意，生产上不要绑定到非127.0.0.1的地址上

 

Kubernetes 1.9

  • 对于Kubernetes1.9集群，需要注意配置KUBE_API_ARGS环境变量中的--authorization-mode=Node,RBAC，增加对Node授权的模式，否则将无法注册node。
  • --experimental-bootstrap-token-auth Bootstrap Token Authentication在kubernetes 1.9版本已经废弃，参数名称改为--enable-bootstrap-token-auth

 

附：1.9之前版本配置

## The address on the local server to listen to.

KUBE_API_ADDRESS="--advertise-address=172.20.0.113 --bind-address=172.20.0.113 --insecure-bind-address=172.20.0.113"
#
## The port on the local server to listen on.
#KUBE_API_PORT="--port=8080"
#
## Port minions listen on
#KUBELET_PORT="--kubelet-port=10250"
#
## Comma separated list of nodes in the etcd cluster
KUBE_ETCD_SERVERS="--etcd-servers=https://172.20.0.113:2379,https://172.20.0.114:2379,https://172.20.0.115:2379"
#
## Address range to use for services
KUBE_SERVICE_ADDRESSES="--service-cluster-ip-range=10.254.0.0/16"
#
## default admission control policies
KUBE_ADMISSION_CONTROL="--admission-control=ServiceAccount,NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota"
#
## Add your own!
KUBE_API_ARGS="--authorization-mode=RBAC --runtime-config=rbac.authorization.k8s.io/v1beta1 --kubelet-https=true --experimental-bootstrap-token-auth --token-auth-file=/etc/kubernetes/token.csv --service-node-port-range=30000-32767 --tls-cert-file=/etc/kubernetes/ssl/kubernetes.pem --tls-private-key-file=/etc/kubernetes/ssl/kubernetes-key.pem --client-ca-file=/etc/kubernetes/ssl/ca.pem --service-account-key-file=/etc/kubernetes/ssl/ca-key.pem --etcd-cafile=/etc/kubernetes/ssl/ca.pem --etcd-certfile=/etc/kubernetes/ssl/kubernetes.pem --etcd-keyfile=/etc/kubernetes/ssl/kubernetes-key.pem --enable-swagger-ui=true --apiserver-count=3 --audit-log-maxage=30 --audit-log-maxbackup=3 --audit-log-maxsize=100 --audit-log-path=/var/lib/audit.log --event-ttl=1h"

 

启动kube-apiserver

systemctl daemon-reload
systemctl enable kube-apiserver
systemctl start kube-apiserver
systemctl status kube-apiserver

 

配置和启动 kube-controller-manager

创建 kube-controller-manager的serivce配置文件

 

service文件路径/usr/lib/systemd/system/kube-controller-manager.service

[root@bogon ~]# cat /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/controller-manager
ExecStart=/usr/local/bin/kube-controller-manager \
        $KUBE_LOGTOSTDERR \
        $KUBE_LOG_LEVEL \
        $KUBE_MASTER \
        $KUBE_CONTROLLER_MANAGER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

 

配置文件/etc/kubernetes/controller-manager

# Add your own!
KUBE_CONTROLLER_MANAGER_ARGS="--address=127.0.0.1 --service-cluster-ip-range=10.254.0.0/16 --cluster-name=kubernetes --cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem --cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem  --service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem --root-ca-file=/etc/kubernetes/ssl/ca.pem --leader-elect=true"
  • --service-cluster-ip-range 参数指定 Cluster 中 Service 的CIDR范围，该网络在各 Node 间必须路由不可达，必须和 kube-apiserver 中的参数一致；
  • --cluster-signing-* 指定的证书和私钥文件用来签名为 TLS BootStrap 创建的证书和私钥；
  • --root-ca-file 用来对 kube-apiserver 证书进行校验，指定该参数后，才会在Pod 容器的 ServiceAccount 中放置该 CA 证书文件；
  • --address 值必须为 127.0.0.1，kube-apiserver 期望 scheduler 和 controller-manager 在同一台机器；

 

启动 kube-controller-manager

systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl start kube-controller-manager
systemctl status kube-controller-manager

 

启动每个组件后可以通过执行命令kubectl get componentstatuses，来查看各个组件的状态;

[root@bogon ~]# kubectl get componentstatuses
NAME                 STATUS    MESSAGE              ERROR
scheduler            Unhealthy   Get http://127.0.0.1:10251/healthz: dial tcp 127.0.0.1:10251: getsockopt: connection refused     #问题解决看下面              
controller-manager   Healthy   ok                   
etcd-1               Healthy   {"health": "true"}   
etcd-2               Healthy   {"health": "true"}   
etcd-0               Healthy   {"health": "true"}

 

配置和启动 kube-scheduler

创建 kube-scheduler的serivce配置文件

 

service文件路径/usr/lib/systemd/system/kube-scheduler.service

[root@bogon ~]# cat /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler Plugin
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
EnvironmentFile=-/etc/kubernetes/config
EnvironmentFile=-/etc/kubernetes/scheduler
ExecStart=/usr/local/bin/kube-scheduler \
            $KUBE_LOGTOSTDERR \
            $KUBE_LOG_LEVEL \
            $KUBE_MASTER \
            $KUBE_SCHEDULER_ARGS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

 

配置文件/etc/kubernetes/scheduler

###
# kubernetes scheduler config

# default config should be adequate

# Add your own!
KUBE_SCHEDULER_ARGS="--leader-elect=true --address=127.0.0.1"
  • --address 值必须为 127.0.0.1，因为当前 kube-apiserver 期望 scheduler 和 controller-manager 在同一台机器；

 

启动 kube-scheduler

systemctl daemon-reload
systemctl enable kube-scheduler
systemctl start kube-scheduler
systemctl status kube-scheduler

 

验证 master 节点功能

[root@bogon ~]# kubectl get componentstatuses
NAME                 STATUS    MESSAGE              ERROR
scheduler            Healthy   ok                   
controller-manager   Healthy   ok                   
etcd-1               Healthy   {"health": "true"}   
etcd-2               Healthy   {"health": "true"}   
etcd-0               Healthy   {"health": "true"}

 

posted @ 2018-09-18 10:57  FRESHMANS  阅读(471)  评论(0)    收藏  举报