手动二进制安装kubernetes

2020-08-17 本文已影响0人岳麓山鸡王

按照李振良博客先做了一遍，确实可行，我是用三台阿里云主机一台master，worknode，另外两台都是worknode。

有问题可以评论或者私信，最好可以告诉我为啥shell代码块不能高亮显示，thx

[toc]

1. 预前工作

master06: 172.22.217.6

node07: 172.22.217.7

node08: 172.22.217.8

#!/bin/bash
# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld

# 关闭selinux
sed -i 's/enforcing/disabled/' /etc/selinux/config  # 永久
setenforce 0  # 临时

# 关闭swap
swapoff -a  # 临时
sed -ri 's/.*swap.*/#&/' /etc/fstab    # 永久

# 根据规划设置主机名
hostnamectl set-hostname <hostname>

# 在master添加hosts
cat >> /etc/hosts << EOF
172.22.217.6 k8s-master
172.22.217.7 k8s-node1
172.22.217.8 k8s-node2
EOF

# 将桥接的IPv4流量传递到iptables的链
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system  # 生效

# 时间同步
yum install ntpdate -y
ntpdate time.windows.com

2. 制作etdc证书（在master节点上）

#!/bin/bash
# 1. 下载，移动并建立可执行权限
mkdir cfssl
cd cfssl
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64 
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

# 2. 生成证书
mkdir -p ~/TLS/{etcd,k8s} 
cd ~/TLS/etcd  ##进入证书目录

# 自签CA：
cat > ca-config.json << EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "www": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

cat > ca-csr.json << EOF
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
        }
    ]
}
EOF

# 生产证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

# 签发etcd https证书
cat > server-csr.json << EOF
{
    "CN": "etcd",
    "hosts": [
    "172.22.217.6",
    "172.22.217.7",
    "172.22.217.8"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}
EOF

# 生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server

# 证书查看
ls ~/TLS/etcd/server*pem
#看到如下
#/root/TLS/etcd/server-key.pem  /root/TLS/etcd/server.pem

ls ~/TLS/etcd/ca*pem
# 看到如下
# ca-key.pem  ca.pem

3. etdc 安装


# 下载etcd，解压。创建目录并移动
wget https://github.com/etcd-io/etcd/releases/download/v3.4.9/etcd-v3.4.9-linux-amd64.tar.gz ##获取二进制文件
mkdir /opt/etcd/{bin,cfg,ssl} -p
tar zxvf etcd-v3.4.9-linux-amd64.tar.gz
mv etcd-v3.4.9-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

# 配置etcd的配置文件！注意每个节点都不一样ip和名称
cat > /opt/etcd/cfg/etcd.conf << EOF
#[Member]
ETCD_NAME="etcd-1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://172.22.217.6:2380"
ETCD_LISTEN_CLIENT_URLS="https://172.22.217.6:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://172.22.217.6:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://172.22.217.6:2379"
ETCD_INITIAL_CLUSTER="etcd-1=https://172.22.217.6:2380,etcd-2=https://172.22.217.7:2380,etcd-3=https://172.22.217.8:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

# 配置service 启动文件
cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd.conf
ExecStart=/opt/etcd/bin/etcd \
--cert-file=/opt/etcd/ssl/server.pem \
--key-file=/opt/etcd/ssl/server-key.pem \
--peer-cert-file=/opt/etcd/ssl/server.pem \
--peer-key-file=/opt/etcd/ssl/server-key.pem \
--trusted-ca-file=/opt/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/opt/etcd/ssl/ca.pem \
--logger=zap
Restart=on-failure
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

# 拷贝刚才的证书
cp ~/TLS/etcd/ca*pem ~/TLS/etcd/server*pem /opt/etcd/ssl/

# 复制bin，配置文件，证书到其他机器，注意ip
scp -r /opt/etcd/ 172.22.217.7:/opt/
scp /usr/lib/systemd/system/etcd.service 172.22.217.7:/usr/lib/systemd/system/
scp -r /opt/etcd/ 172.22.217.8:/opt/
scp /usr/lib/systemd/system/etcd.service 172.22.217.8:/usr/lib/systemd/system/

# 修改node1 和 node2节点上的配置文件信息
sed -i '4,8s/172.22.217.6/172.22.217.7/' /opt/etcd/cfg/etcd.conf  ; sed -i '2s/etcd-1/etcd-3/'  /opt/etcd/cfg/etcd.conf ###在node1执行
sed -i '4,8s/172.22.217.6/172.22.217.8/' /opt/etcd/cfg/etcd.conf  ; sed -i '2s/etcd-1/etcd-3/'  /opt/etcd/cfg/etcd.conf ###在node1执行

# 依次开启节点
systemctl daemon-reload
systemctl start etcd
systemctl enable etcd


# 检查状态
ETCDCTL_API=3 /opt/etcd/bin/etcdctl --cacert=/opt/etcd/ssl/ca.pem --cert=/opt/etcd/ssl/server.pem --key=/opt/etcd/ssl/server-key.pem --endpoints="https://172.22.217.6:2379,https://172.22.217.7:2379,https://172.22.217.8:2379" endpoint health

# 显示如下
# https://172.22.217.7:2379 is healthy: successfully committed proposal: took = 12.648209ms
# https://172.22.217.6:2379 is healthy: successfully committed proposal: took = 12.59362ms
# https://172.22.217.8:2379 is healthy: successfully committed proposal: took = 13.813008ms

4. 安装docker

这里不一定要用二进制安装


# 1.下载，解压
wget https://download.docker.com/linux/static/stable/x86_64/docker-19.03.9.tgz
tar zxvf docker-19.03.9.tgz
mv docker/* /usr/bin


# 2. 配置service
cat > /usr/lib/systemd/system/docker.service << EOF
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target
EOF

# 3.配置加速器
mkdir -p /etc/docker
tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://zpfw35hf.mirror.aliyuncs.com"]
}
EOF

# 设置开机启动并启动
systemctl daemon-reload 
systemctl start docker
systemctl enable docker

# 同样部署在node1 和node2 上

5. 部署master的组件

颁发证书，安装kube-apiserver,kubemanager,kuber-scheduler，查看

制作证书

cat > ca-config.json << EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF
cat > ca-csr.json << EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

# 生成并查看证书
cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

ls *pem
ca-key.pem  ca.pem

使用自签CA签发kube-apiserver HTTPS证书，需要修改对应的ip

cd TLS/k8s
cat > server-csr.json << EOF
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "172.22.217.6", 
      "172.22.217.7",
      "172.22.217.8",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

# 生产并查看证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

ls server*pem
server-key.pem  server.pem

注：上述文件hosts字段中IP为所有Master/LB/VIP IP，一个都不能少！为了方便后期扩容可以多写几个预留的IP。

部署节点组件

# 1. ======================拷贝证书
cp ~/TLS/k8s/ca*pem ~/TLS/k8s/server*pem /opt/kubernetes/ssl/
# 启用 TLS Bootstrapping 机制
cat > /opt/kubernetes/cfg/token.csv << EOF
b1dc586d69159ff4e3ef7efa9db60e48,10001,"system:node-bootstrapper"
EOF


# 2. ======================配置apiserver
# apiserver 配置文件
cat > /opt/kubernetes/cfg/kube-apiserver.conf << EOF
KUBE_APISERVER_OPTS="--logtostderr=false \\
--v=4 \\
--log-dir=/opt/kubernetes/logs \\
--etcd-servers=https://172.22.217.6:2379,https://172.22.217.7:2379,https://172.22.217.8:2379 \\
--bind-address=172.22.217.6 \\
--secure-port=6443 \\
--advertise-address=172.22.217.6 \\
--allow-privileged=true \\
--service-cluster-ip-range=10.233.0.0/24 \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \\
--authorization-mode=RBAC,Node \\
--enable-bootstrap-token-auth=true \\
--token-auth-file=/opt/kubernetes/cfg/token.csv \\
--service-node-port-range=30000-32767 \\
--kubelet-client-certificate=/opt/kubernetes/ssl/server.pem \\
--kubelet-client-key=/opt/kubernetes/ssl/server-key.pem \\
--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/etcd/ssl/ca.pem \\
--etcd-certfile=/opt/etcd/ssl/server.pem \\
--etcd-keyfile=/opt/etcd/ssl/server-key.pem \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/opt/kubernetes/logs/k8s-audit.log"
EOF

# service进程文件
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-apiserver.conf
ExecStart=/opt/kubernetes/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF

# 启动 kube-apiserver
systemctl daemon-reload
systemctl start kube-apiserver
systemctl enable kube-apiserver



# 3. ======================配置kube-controller-manager
cat > /opt/kubernetes/cfg/kube-controller-manager.conf << EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \\
--v=4 \\
--log-dir=/opt/kubernetes/logs \\
--leader-elect=true \\
--master=127.0.0.1:8080 \\
--bind-address=127.0.0.1 \\
--allocate-node-cidrs=true \\
--cluster-cidr=10.244.0.0/16 \\
--service-cluster-ip-range=10.0.0.0/24 \\
--cluster-signing-cert-file=/opt/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/opt/kubernetes/ssl/ca-key.pem  \\
--root-ca-file=/opt/kubernetes/ssl/ca.pem \\
--service-account-private-key-file=/opt/kubernetes/ssl/ca-key.pem \\
--experimental-cluster-signing-duration=87600h0m0s"
EOF


cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-controller-manager.conf
ExecStart=/opt/kubernetes/bin/kube-controller-manager \$KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF

# 启动kube-controller-manager
systemctl daemon-reload
systemctl start kube-controller-manager
systemctl enable kube-controller-manager


# 4. ======================配置kube-scheduler
cat > /opt/kubernetes/cfg/kube-scheduler.conf << EOF
KUBE_SCHEDULER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect \
--master=127.0.0.1:8080 \
--bind-address=127.0.0.1"
EOF

cat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-scheduler.conf
ExecStart=/opt/kubernetes/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF

# 启动 kube-scheduler
systemctl daemon-reload
systemctl start kube-scheduler
systemctl enable kube-scheduler


# 5. ======================查看集群状况，正常出现如下情况呢
kubectl get cs
# NAME                 STATUS    MESSAGE             ERROR
# scheduler            Healthy   ok                  
# controller-manager   Healthy   ok                  
# etcd-1               Healthy   {"health":"true"}   
# etcd-0               Healthy   {"health":"true"}   
# etcd-2               Healthy   {"health":"true"}

6. 部署node节点

可以在master节点上部署，但是不主张，master节点一般性能较差

cd ~kubernetes/server/bin
cp kubelet kube-proxy /opt/kubernetes/bin 

# 1. ======================部署kubelet
cat > /opt/kubernetes/cfg/kubelet.conf << EOF
KUBELET_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--hostname-override=k8s-master \\  #此处节点名称需要修改和hosts一样
--network-plugin=cni \\
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \\
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \\
--config=/opt/kubernetes/cfg/kubelet-config.yml \\
--cert-dir=/opt/kubernetes/ssl \\
--pod-infra-container-image=lizhenliang/pause-amd64:3.0"
EOF

2. 配置参数文件
cat > /opt/kubernetes/cfg/kubelet-config.yml << EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local 
failSwapOn: false
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /opt/kubernetes/ssl/ca.pem 
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110
EOF


# 2. ======================生成bootstrap.kubeconfig文件
KUBE_APISERVER="https://172.22.217.6:6443" # apiserver的ip需要maser的ip
TOKEN="c47ffb939f5ca36231d9e3121a252940" # 与token.csv里保持一致
cat /opt/kubernetes/cfg/token.csv

# 生成 kubelet bootstrap kubeconfig 配置文件
kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=bootstrap.kubeconfig
kubectl config set-credentials "kubelet-bootstrap" \
  --token=${TOKEN} \
  --kubeconfig=bootstrap.kubeconfig
kubectl config set-context default \
  --cluster=kubernetes \
  --user="kubelet-bootstrap" \
  --kubeconfig=bootstrap.kubeconfig
kubectl config use-context default --kubeconfig=bootstrap.kubeconfig
# 拷贝到配置文件路径：
cp bootstrap.kubeconfig /opt/kubernetes/cfg
# 生成systemd管理kubelet
cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kubelet.conf
ExecStart=/opt/kubernetes/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF
# 启动并设置开机启动
systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet


# 3. ======================批准kubelet证书申请并加入集群
# 查看kubelet证书请求
kubectl get csr
#NAME                                                   AGE    SIGNERNAME                                    REQUESTOR           CONDITION
#node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A   6m3s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending

# 批准申请
kubectl certificate approve node-csr-uCEGPOIiDdlLODKts8J658HrFq9CZ--K6M4G7bjhk8A

# 查看节点
kubectl get node
NAME         STATUS     ROLES    AGE   VERSION
k8s-master   NotReady   <none>   7s    v1.18.3
注：由于网络插件还没有部署，节点会没有准备就绪 NotReady

# 4. ======================部署kube-proxy
# 生成kube-proxy.kubeconfig文件，生成kube-proxy证书：
# 切换工作目录
cd ~/TLS/k8s

# 创建证书请求文件
cat > kube-proxy-csr.json << EOF
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

# 生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

ls kube-proxy*pem
# kube-proxy-key.pem  kube-proxy.pem

#生成kubeconfig文件：
KUBE_APISERVER="https://172.22.217.6:6443" #注意apiserver是masterip
kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy \
  --client-certificate=./kube-proxy.pem \
  --client-key=./kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig
kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
# 拷贝到配置文件指定路径：
cp kube-proxy.kubeconfig /opt/kubernetes/cfg/

# 创建配置文件
cat > /opt/kubernetes/cfg/kube-proxy.conf << EOF
KUBE_PROXY_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/opt/kubernetes/logs \\
--config=/opt/kubernetes/cfg/kube-proxy-config.yml"
EOF

# 配置参数文件
cat > /opt/kubernetes/cfg/kube-proxy-config.yml << EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
metricsBindAddress: 0.0.0.0:10249
clientConnection:
  kubeconfig: /opt/kubernetes/cfg/kube-proxy.kubeconfig
hostnameOverride: k8s-master
clusterCIDR: 10.0.0.0/24    # clusterCIDR不要冲突
EOF

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

[Service]
EnvironmentFile=/opt/kubernetes/cfg/kube-proxy.conf
ExecStart=/opt/kubernetes/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF
# kube-proxy启动并设置开机启动
systemctl daemon-reload
systemctl start kube-proxy
systemctl enable kube-proxy

7.部署其他node节点

此处对两个节点相同操作，主要是删除遗留信息文件和节点名称。

# 拷贝已部署好的Node相关文件到新节点
在master节点将Worker Node涉及文件拷贝到新节点172.22.217.7/172.22.217.8
# 拷贝，这里可能需要新建文件夹
scp /opt/kubernetes root@172.22.217.7:/opt/ # 节点的东西
scp -r /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@172.22.217.7:/usr/lib/systemd/system # 服务
scp -r /opt/cni/ root@172.22.217.7:/opt/  #网络文件
scp /opt/kubernetes/ssl/ca.pem root@172.22.217.7:/opt/kubernetes/ssl # 证书

# 删除kubelet证书和kubeconfig文件，类似于节点的信息
rm /opt/kubernetes/cfg/kubelet.kubeconfig 
rm -f /opt/kubernetes/ssl/kubelet*
注：这几个文件是证书申请审批后自动生成的，每个Node不同，必须删除重新生成。

# 修改kublet中对应的主机名，如同修改etcd的ip和主机名一样
vi /opt/kubernetes/cfg/kubelet.conf
--hostname-override=k8s-node1
vi /opt/kubernetes/cfg/kube-proxy-config.yml
hostnameOverride: k8s-node1

# 启动并设置开机启动
systemctl daemon-reload
systemctl start kubelet
systemctl enable kubelet
systemctl start kube-proxy
systemctl enable kube-proxy
# 在Master上批准新Node kubelet证书申请，和之前master节点自己请求，自己发证书一样
kubectl get csr
# NAME                                                   AGE   SIGNERNAME                                    REQUESTOR           CONDITION
# node-csr-4zTjsaVSrhuyhIGqsefxzVoZDCNKei-aE2jyTP81Uro   89s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending
kubectl certificate approve node-csr-4zTjsaVSrhuyhIGqsefxzVoZDCNKei-aE2jyTP81Uro

# 查看Node状态
kubectl get node
# NAME         STATUS     ROLES    AGE   VERSION
# k8s-master   Ready      <none>   65m   v1.18.3
# k8s-node1    Ready      <none>   12m   v1.18.3
# k8s-node2    Ready      <none>   81s   v1.18.3

8. 部署CNI网络

# 解压二进制包并移动到默认工作目录：
mkdir /opt/cni/bin
tar zxvf cni-plugins-linux-amd64-v0.8.6.tgz -C /opt/cni/bin

# 默认镜像地址无法访问，修改为docker hub镜像仓库。最好修改一下他的仓库 lizhenliang
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
sed -i -r "s#quay.io/coreos/flannel:.*-amd64#lizhenliang/flannel:v0.12.0-amd64#g" kube-flannel.yml

# 应用网络
kubectl apply -f kube-flannel.yml

# 查看网络和节点
kubectl get pods -n kube-system
#NAME                          READY   STATUS    RESTARTS   AGE
#kube-flannel-ds-amd64-2pc95   1/1     Running   0          72s

kubectl get node
#NAME         STATUS   ROLES    AGE   VERSION
#k8s-master   Ready    <none>   41m   v1.18.3

# 授权apiserver访问kubelet
cat > apiserver-to-kubelet-rbac.yaml << EOF
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:kube-apiserver-to-kubelet
rules:
  - apiGroups:
      - ""
    resources:
      - nodes/proxy
      - nodes/stats
      - nodes/log
      - nodes/spec
      - nodes/metrics
      - pods/log
    verbs:
      - "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: system:kube-apiserver
  namespace: ""
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:kube-apiserver-to-kubelet
subjects:
  - apiGroup: rbac.authorization.k8s.io
    kind: User
    name: kubernetes
EOF

# 应用授权
kubectl apply -f apiserver-to-kubelet-rbac.yaml

9. dashboard和coredns

部署Dashboard

$ wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-beta8/aio/deploy/recommended.yaml

默认Dashboard只能集群内部访问，修改Service为NodePort类型，暴露到外部：

vi recommended.yaml
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30001
  type: NodePort
  selector:
    k8s-app: kubernetes-dashboard

# 应用dashboard文件
kubectl apply -f recommended.yaml

kubectl get pods,svc -n kubernetes-dashboard
# NAME                                             READY   STATUS              RESTARTS   AGE
# pod/dashboard-metrics-scraper-694557449d-z8gfb   1/1     Running             0          2m18s
# pod/kubernetes-dashboard-9774cc786-q2gsx         1/1     Running             0          2m19s

NAME                                TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE
service/dashboard-metrics-scraper   ClusterIP   10.0.0.141   <none>        8000/TCP        2m19s
service/kubernetes-dashboard        NodePort    10.0.0.239   <none>        443:30001/TCP   2m19s

访问地址：https://NodeIP:30001，此处使用公网ip

创建service account并绑定默认cluster-admin管理员集群角色：

kubectl create serviceaccount dashboard-admin -n kube-system
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')

使用输出的token登录Dashboard。

最好用火狐浏览器打开！！！！，不知道为啥，后期再看

image.png

部署CoreDNS

CoreDNS用于集群内部Service名称解析。

kubectl apply -f coredns.yaml

kubectl get pods -n kube-system 
NAME                          READY   STATUS    RESTARTS   AGE
coredns-5ffbfd976d-j6shb      1/1     Running   0          32s
kube-flannel-ds-amd64-2pc95   1/1     Running   0          38m
kube-flannel-ds-amd64-7qhdx   1/1     Running   0          15m
kube-flannel-ds-amd64-99cr8   1/1     Running   0          26m

DNS解析测试：

kubectl run -it --rm dns-test --image=busybox:1.28.4 sh
If you don't see a command prompt, try pressing enter.

/ # nslookup kubernetes
Server:    10.0.0.2
Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.0.0.1 kubernetes.default.svc.cluster.local