Kubernetes容器集群部署节点组件(五)

其他 2018-08-08 17:10:29 阅读次数: 0

master端下载kubernetes组件：

wget https://storage.googleapis.com/kubernetes-release/release/v1.9.2/kubernetes-server-linux-amd64.tar.gz

node端下工kubernetes node组件：

wget https://dl.k8s.io/v1.9.2/kubernetes-node-linux-amd64.tar.gz

部署master组件

master操作：

把二制文件移动到bin下

[root@master bin]# pwd
/root/master_pkg/kubernetes/server/bin

[root@master bin]# cp kube-controller-manager kube-scheduler kube-apiserver /opt/kubernetes/bin/

[root@master bin]# chmod +x /opt/kubernetes/bin/*

添加apiserver.sh脚本

#!/bin/bash

MASTER_ADDRESS=${1:-"192.168.1.195"}
ETCD_SERVERS=${2:-"http://127.0.0.1:2379"}

cat <<EOF >/opt/kubernetes/cfg/kube-apiserver

KUBE_APISERVER_OPTS="--logtostderr=true \\
--v=4 \\
--etcd-servers=${ETCD_SERVERS} \\
--insecure-bind-address=127.0.0.1 \\
--bind-address=${MASTER_ADDRESS} \\
--insecure-port=8080 \\
--secure-port=6443 \\
--advertise-address=${MASTER_ADDRESS} \\
--allow-privileged=true \\
--service-cluster-ip-range=10.10.10.0/24 \\
--admission-control=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction \
--authorization-mode=RBAC,Node \\
--kubelet-https=true \\
--enable-bootstrap-token-auth \\
--token-auth-file=/opt/kubernetes/cfg/token.csv \\
--service-node-port-range=30000-50000 \\
--tls-cert-file=/opt/kubernetes/ssl/server.pem  \\
--tls-private-key-file=/opt/kubernetes/ssl/server-key.pem \\
--client-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--etcd-cafile=/opt/kubernetes/ssl/ca.pem \\
--etcd-certfile=/opt/kubernetes/ssl/server.pem \\
--etcd-keyfile=/opt/kubernetes/ssl/server-key.pem"

EOF

cat <<EOF >/usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-apiserver
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-apiserver
systemctl restart kube-apiserver
apiserver.sh

执行apiserver.sh脚本：

[root@master bin]# ./apiserver.sh 192.168.1.101 https://192.168.1.101:2379,https://192.168.1.102:2379,https://192.168.1.103:2379
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-apiserver.service to /usr/lib/systemd/system/kube-apiserver.service.

将token.csv放到cfg目录下

cp /opt/kubernetes/ssl/token.csv /opt/kubernetes/cfg/

启动kube-apiserver

[root@master bin]# systemctl start kube-apiserver

添加controller-manager.sh控制器脚本

#!/bin/bash

MASTER_ADDRESS=${1:-"127.0.0.1"}

cat <<EOF >/opt/kubernetes/cfg/kube-controller-manager


KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \\
--v=4 \\
--master=${MASTER_ADDRESS}:8080 \\
--leader-elect=true \\
--address=127.0.0.1 \\
--service-cluster-ip-range=10.10.10.0/24 \\
--cluster-name=kubernetes \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem"

EOF

cat <<EOF >/usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-controller-manager
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-controller-manager
systemctl restart kube-controller-manager
controller-manager.sh

执行脚本：

[root@master bin]# ./controller-manager.sh 127.0.0.1

查看服务是否启动

[root@master bin]# ps -ef | grep controller-manager
root      16464      1 10 14:34 ?        00:00:01 /opt/kubernetes/bin/kube-controller-manager --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect=true --address=127.0.0.1 --service-cluster-ip-range=10.10.10.0/24 --cluster-name=kubernetes --cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem --cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem --service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem --root-ca-file=/opt/kubernetes/ssl/ca.pem

添加scheduler.sh脚本

#!/bin/bash

MASTER_ADDRESS=${1:-"127.0.0.1"}

cat <<EOF >/opt/kubernetes/cfg/kube-scheduler

KUBE_SCHEDULER_OPTS="--logtostderr=true \\
--v=4 \\
--master=${MASTER_ADDRESS}:8080 \\
--leader-elect"

EOF

cat <<EOF >/usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-scheduler
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-scheduler
systemctl restart kube-scheduler
scheduler

执行脚本

[root@master bin]# ./scheduler.sh 127.0.0.1

查看服务是否启动

[root@master bin]# ps -ef | grep scheduler
root      16531      1  4 14:37 ?        00:00:00 /opt/kubernetes/bin/kube-scheduler --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect

查看节点状态

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

部署node节点

将master节点生成的kubeconfig文件传到两个节点的cfg目录下

/opt/kubernetes/ssl
[root@master ssl]# scp *kubeconfig root@192.168.1.102:/opt/kubernetes/cfg/
[root@master ssl]# scp *kubeconfig root@192.168.1.103:/opt/kubernetes/cfg/

node1节点操作：

解压kubernetes-node-linux-amd64.tar.gz 包

[root@node1 node_pkg]# tar xvf kubernetes-node-linux-amd64.tar.gz

将解压出来的二制移到bin下

[root@node1 bin]# cp kubelet kube-proxy /opt/kubernetes/bin/
[root@node1 bin]# chmod +x /opt/kubernetes/bin/*

添加kubelet.sh脚本

#!/bin/bash

NODE_ADDRESS=${1:-"192.168.1.196"}
DNS_SERVER_IP=${2:-"10.10.10.2"}

cat <<EOF >/opt/kubernetes/cfg/kubelet

KUBELET_OPTS="--logtostderr=true \\
--v=4 \\
--address=${NODE_ADDRESS} \\
--hostname-override=${NODE_ADDRESS} \\
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\
--experimental-bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\
--cert-dir=/opt/kubernetes/ssl \\
--allow-privileged=true \\
--cluster-dns=${DNS_SERVER_IP} \\
--cluster-domain=cluster.local \\
--fail-swap-on=false \\
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"

EOF

cat <<EOF >/usr/lib/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet
After=docker.service
Requires=docker.service

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kubelet
ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
KillMode=process

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kubelet
systemctl restart kubelet
kubelet.sh

执行脚本

[root@node1 bin]# ./kubelet.sh 192.168.0.102 10.10.10.2
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.


备注：192.168.0.102为你当前节点的IP   10.10.10.2为你的DNS地址

查看kubelete是否启动

发现有错误日志,创建证权限拒绝

error: failed to run Kubelet: cannot create certificate signing request: certificatesigningrequests.certificates.k8s.io is forbidden: User "kubelet-bootstrap" cannot create certificatesigningrequests.certificates.k8s.io at the cluster scope: clusterrole.rbac.authorization.k8s.io "system:node-bootstrap" not found

解决方法

在master端创建权限分配角色

[root@master ssl]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap

node节点再次启动kubelet

创建proxy.sh脚本

#!/bin/bash

NODE_ADDRESS=${1:-"192.168.1.200"}

cat <<EOF >/opt/kubernetes/cfg/kube-proxy

KUBE_PROXY_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=${NODE_ADDRESS} \
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"

EOF

cat <<EOF >/usr/lib/systemd/system/kube-proxy.service
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=-/opt/kubernetes/cfg/kube-proxy
ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable kube-proxy
systemctl restart kube-proxy
proxy.sh

执行脚本

[root@node1 ssl]# ./proxy.sh 192.168.1.102

备注：192.168.1.102是当前节点的地址

在master查看节点请求信息：

[root@master ssl]# kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-iVbj9CKPaWhh7VAQfqK16Xz9in4-Byb_XZaDJLz3zfw   11m       kubelet-bootstrap   Pending

允许自签证书请求连接

[root@master ssl]# kubectl certificate approve node-csr-iVbj9CKPaWhh7VAQfqK16Xz9in4-Byb_XZaDJLz3zfw

再次查看连接：

[root@master ssl]# kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-iVbj9CKPaWhh7VAQfqK16Xz9in4-Byb_XZaDJLz3zfw   14m       kubelet-bootstrap   Approved,Issued

查看Node为准备状态

[root@master ssl]# kubectl get node
NAME            STATUS    ROLES     AGE       VERSION
192.168.1.102   Ready     <none>    1m        v1.9.2

node2节点操作：

把Node1节点的文个拷到node2节点，或者重复node1节点步骤

[root@node1 ssl]# scp -r /opt/kubernetes/bin root@192.168.1.103:/opt/kubernetes

[root@node1 ssl]# scp -r /opt/kubernetes/cfg root@192.168.1.103:/opt/kubernetes

[root@node1 ssl]# scp /usr/lib/systemd/system/kubelet.service [email protected]:/usr/lib/systemd/system/

[root@node1 ssl]# scp /usr/lib/systemd/system/kube-proxy.service [email protected]:/usr/lib/systemd/system/

修改node2节点cfg下kubelet配置文件的ip改为当前节点IP

KUBELET_OPTS="--logtostderr=true \
--v=4 \
--address=192.168.1.103 \
--hostname-override=192.168.1.103 \
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \
--experimental-bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \
--cert-dir=/opt/kubernetes/ssl \
--allow-privileged=true \
--cluster-dns=10.10.10.2 \
--cluster-domain=cluster.local \
--fail-swap-on=false \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"

修改node2节点cfg下kube-proxy配置文件的ip改为当前节点IP

KUBE_PROXY_OPTS="--logtostderr=true --v=4 --hostname-override=192.168.1.103 --kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"

启动服务

[root@node2 cfg]# systemctl start kubelet
[root@node2 cfg]# systemctl start kube-proxy

master节点查看是否有请求

[root@master ssl]# kubectl get csr
NAME                                                   AGE       REQUESTOR           CONDITION
node-csr-OPWss8__QdJqP6QmudtkaVQWeDh278BxzP35hdeAkZI   17s       kubelet-bootstrap   Pending
node-csr-iVbj9CKPaWhh7VAQfqK16Xz9in4-Byb_XZaDJLz3zfw   28m       kubelet-bootstrap   Approved,Issued

允许自签证书连接

[root@master ssl]# kubectl certificate approve node-csr-OPWss8__QdJqP6QmudtkaVQWeDh278BxzP35hdeAkZI

查看节点

[root@master ssl]# kubectl get node
NAME            STATUS    ROLES     AGE       VERSION
192.168.1.102   Ready     <none>    15m       v1.9.2
192.168.1.103   Ready     <none>    12s       v1.9.2

 

测试示例

创建nginx实例：

[root@master ssl]# kubectl run nginx --image=nginx --replicas=3

查看Pod

[root@master ssl]# kubectl get pod
NAME                   READY     STATUS              RESTARTS   AGE
nginx-8586cf59-7r4zq   0/1       ContainerCreating   0          10s
nginx-8586cf59-9wpwr   0/1       ContainerCreating   0          10s
nginx-8586cf59-h2n5h   0/1       ContainerCreating   0          10s

查看资源对象

[root@master ssl]# kubectl get all
NAME                       READY     STATUS              RESTARTS   AGE
pod/nginx-8586cf59-7r4zq   0/1       ContainerCreating   0          1m
pod/nginx-8586cf59-9wpwr   0/1       ContainerCreating   0          1m
pod/nginx-8586cf59-h2n5h   0/1       ContainerCreating   0          1m

NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
service/kubernetes   ClusterIP   10.10.10.1   <none>        443/TCP   1h

NAME                          DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deployment.extensions/nginx   3         3         3            0           1m

NAME                                   DESIRED   CURRENT   READY     AGE
replicaset.extensions/nginx-8586cf59   3         3         0         1m

NAME                    DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/nginx   3         3         3            0           1m

NAME                             DESIRED   CURRENT   READY     AGE
replicaset.apps/nginx-8586cf59   3         3         0         1m

查看容器运行在哪个节点

[root@master ssl]# kubectl get pod -o wide
NAME                   READY     STATUS             RESTARTS   AGE       IP            NODE
nginx-8586cf59-7r4zq   0/1       ImagePullBackOff   0          7m        172.17.47.2   192.168.1.103
nginx-8586cf59-9wpwr   1/1       Running            0          7m        172.17.47.3   192.168.1.103
nginx-8586cf59-h2n5h   1/1       Running            0          7m        172.17.45.2   192.168.1.102

对外发布一个服务

[root@master ssl]# kubectl expose deployment nginx --port=88 --target-port=80 --type=NodePort
[root@master ssl]# kubectl get svc
NAME         TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.10.10.1     <none>        443/TCP        2h
nginx        NodePort    10.10.10.130   <none>        88:34986/TCP   13s
备注:88端口是提供node节点访问
     34986为随机端口，外问该问

在node节点访问88这个端口

[root@node1 ssl]# curl -I 10.10.10.130:88
HTTP/1.1 200 OK
Server: nginx/1.15.2
Date: Wed, 08 Aug 2018 08:54:09 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Tue, 24 Jul 2018 13:02:29 GMT
Connection: keep-alive
ETag: "5b572365-264"
Accept-Ranges: bytes

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