k8s---master组件部署详解

在master上操作，api-server生成证书

从宿主机上拉到/opt/k8s目录里
[root@localhost k8s]# unzip master.zip
[root@server3 opt]# mkdir /opt/kubernetes/{cfg,bin,ssl} -p
[root@localhost k8s]# mkdir k8s-cert
[root@localhost k8s]# cd k8s-cert/
[root@server3 k8s-cert]# ls
k8s-cert.sh
[root@server3 k8s-cert]# cat k8s-cert.sh 
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

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -

#-----------------------

cat > server-csr.json <<EOF
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "192.168.188.30",
      "192.168.188.10",
      "192.168.188.100",
      "192.168.188.20",
      "192.168.188.60",
      "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

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server

#-----------------------

cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

#-----------------------

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

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

启动脚本
[root@server3 k8s-cert]# bash k8s-cert.sh 
2021/03/24 10:15:26 [INFO] generating a new CA key and certificate from CSR
2021/03/24 10:15:26 [INFO] generate received request
2021/03/24 10:15:26 [INFO] received CSR
2021/03/24 10:15:26 [INFO] generating key: rsa-2048
2021/03/24 10:15:26 [INFO] encoded CSR
2021/03/24 10:15:26 [INFO] signed certificate with serial number 120439959829303657175495288603635910631168907118
2021/03/24 10:15:26 [INFO] generate received request
2021/03/24 10:15:26 [INFO] received CSR
2021/03/24 10:15:26 [INFO] generating key: rsa-2048
2021/03/24 10:15:26 [INFO] encoded CSR
2021/03/24 10:15:26 [INFO] signed certificate with serial number 293547028150330143961732968627265826658127891196
2021/03/24 10:15:26 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
2021/03/24 10:15:26 [INFO] generate received request
2021/03/24 10:15:26 [INFO] received CSR
2021/03/24 10:15:26 [INFO] generating key: rsa-2048
2021/03/24 10:15:26 [INFO] encoded CSR
2021/03/24 10:15:26 [INFO] signed certificate with serial number 254043705608525302132370100596214027100058018467
2021/03/24 10:15:26 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
2021/03/24 10:15:26 [INFO] generate received request
2021/03/24 10:15:26 [INFO] received CSR
2021/03/24 10:15:26 [INFO] generating key: rsa-2048
2021/03/24 10:15:27 [INFO] encoded CSR
2021/03/24 10:15:27 [INFO] signed certificate with serial number 365919138943413689883243320106102594011700971042
2021/03/24 10:15:27 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").

[root@server3 k8s-cert]# ll *pem
-rw-------. 1 root root 1675 3月  24 10:15 admin-key.pem
-rw-r--r--. 1 root root 1399 3月  24 10:15 admin.pem
-rw-------. 1 root root 1675 3月  24 10:15 ca-key.pem
-rw-r--r--. 1 root root 1359 3月  24 10:15 ca.pem
-rw-------. 1 root root 1675 3月  24 10:15 kube-proxy-key.pem
-rw-r--r--. 1 root root 1403 3月  24 10:15 kube-proxy.pem
-rw-------. 1 root root 1679 3月  24 10:15 server-key.pem
-rw-r--r--. 1 root root 1643 3月  24 10:15 server.pem

[root@server3 k8s-cert]# cp ca*pem server*pem /opt/kubernetes/ssl/

[root@server3 k8s-cert]# cd /opt/kubernetes/ssl/
[root@server3 ssl]# ls
ca-key.pem  ca.pem  server-key.pem  server.pem

解压kubernetes压缩包

把kubernetes-server-linux-amd64.tar.gz压缩包放进/root/k8s/目录里

[root@server3 k8s]# tar zxvf kubernetes-server-linux-amd64.tar.gz 
[root@server3 k8s]# ls
apiserver.sh           etcd-v3.3.10-linux-amd64              master.zip
controller-manager.sh  etcd-v3.3.10-linux-amd64.tar.gz       scheduler.sh
etcd-cert              kubernetes
etcd.sh                kubernetes-server-linux-amd64.tar.gz
[root@server3 k8s]# cd /root/k8s/kubernetes/server/bin

复制关键命令文件

[root@server3 bin]# ls
apiextensions-apiserver              kube-controller-manager.tar
cloud-controller-manager             kubectl
cloud-controller-manager.docker_tag  kubelet
cloud-controller-manager.tar         kube-proxy
hyperkube                            kube-proxy.docker_tag
kubeadm                              kube-proxy.tar
kube-apiserver                       kube-scheduler
kube-apiserver.docker_tag            kube-scheduler.docker_tag
kube-apiserver.tar                   kube-scheduler.tar
kube-controller-manager              mounter
kube-controller-manager.docker_tag
[root@server3 bin]# cp kube-apiserver kubectl kube-controller-manager kube-scheduler /opt/kubernetes/bin/
[root@server3 bin]# cd /root/k8s/

[root@server3 k8s]# head -c 16 /dev/urandom | od -An -t x | tr -d ' '
9c8a6669d8f96432b6ecc3007e169d59
[root@server3 k8s]# vim /opt/kubernetes/cfg/token.csv

9c8a6669d8f96432b6ecc3007e169d59,kubelet-bootstrap,10001,"system:kubelet-bootstrap"

开启apiserver

二进制文件，token，证书都准备好，开启apiserver

[root@server3 ~]# cd k8s/
[root@server3 k8s]# ls
apiserver.sh              etcd-v3.3.10-linux-amd64.tar.gz
controller-manager.sh     kubernetes
etcd-cert                 kubernetes-server-linux-amd64.tar.gz
etcd.sh                   master.zip
etcd-v3.3.10-linux-amd64  scheduler.sh
[root@server3 k8s]# chmod +x controller-manager.sh 


检查进程是否启动成功
[root@server3 k8s]# ps aux | grep kube
监听的https端口
[root@server3 k8s]# netstat -anpt | grep 6443
tcp        0      0 192.168.188.30:6443     0.0.0.0:*               LISTEN      54427/kube-apiserve 
tcp        0      0 192.168.188.30:6443     192.168.188.30:54638    ESTABLISHED 54427/kube-apiserve 
tcp        0      0 192.168.188.30:54638    192.168.188.30:6443     ESTABLISHED 54427/kube-apiserve 

查看http端口是否起来
[root@server3 k8s]# netstat -ntap | grep 8080
tcp        0      0 127.0.0.1:8080          0.0.0.0:*               LISTEN      54427/kube-apiserve 

启动scheduler服务

[root@server3 k8s]# ls
apiserver.sh              etcd-v3.3.10-linux-amd64.tar.gz
controller-manager.sh     kubernetes
etcd-cert                 kubernetes-server-linux-amd64.tar.gz
etcd.sh                   master.zip
etcd-v3.3.10-linux-amd64  scheduler.sh
[root@server3 k8s]# bash scheduler.sh 127.0.0.1
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.


[root@server3 k8s]# systemctl status kube-scheduler.service 
[root@server3 k8s]# chmod +x controller-manager.sh 

启动controller-manager

[root@server3 k8s]# bash controller-manager.sh 127.0.0.1
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service to /usr/lib/systemd/system/kube-controller-manager.service.



查看master 节点状态
[root@server3 k8s]# /opt/kubernetes/bin/kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
controller-manager   Healthy   ok                  
scheduler            Healthy   ok                  
etcd-2               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}   
etcd-0               Healthy   {"health":"true"} 

node节点部署

master上操作
把 kubelet、kube-proxy拷贝到node节点上去

[root@server3 k8s]# cd kubernetes/
[root@server3 kubernetes]# ls
addons  kubernetes-src.tar.gz  LICENSES  server
[root@server3 kubernetes]# cd server/
[root@server3 server]# ls
bin
[root@server3 server]# cd bin/
[root@server3 bin]# ls
apiextensions-apiserver              kube-controller-manager.tar
cloud-controller-manager             kubectl
cloud-controller-manager.docker_tag  kubelet
cloud-controller-manager.tar         kube-proxy
hyperkube                            kube-proxy.docker_tag
kubeadm                              kube-proxy.tar
kube-apiserver                       kube-scheduler
kube-apiserver.docker_tag            kube-scheduler.docker_tag
kube-apiserver.tar                   kube-scheduler.tar
kube-controller-manager              mounter
kube-controller-manager.docker_tag
[root@server3 bin]# scp kubelet kube-proxy root@192.168.188.40:/opt/kubernetes/bin/
root@192.168.188.40's password: 
kubelet                                100%  168MB  90.3MB/s   00:01    
kube-proxy                             100%   48MB  88.4MB/s   00:00    
[root@server3 bin]# scp kubelet kube-proxy root@192.168.188.50:/opt/kubernetes/bin/
root@192.168.188.50's password: 
kubelet                                100%  168MB 141.9MB/s   00:01    
kube-proxy                             100%   48MB 144.9MB/s 00:00  

nod01节点操作
复制node.zip到/root目录下再解压

[root@node01 ~]# ls
anaconda-ks.cfg                     node.zip         模板  下载
flannel.sh                          original-ks.cfg  视频  音乐
flannel-v0.10.0-linux-amd64.tar.gz  README.md        图片  桌面
initial-setup-ks.cfg                公共             文档
[root@node01 ~]# unzip node.zip 
Archive:  node.zip
  inflating: proxy.sh                
  inflating: kubelet.sh  

在master上操作

[root@server3 bin]# cd /root/k8s/
[root@server3 k8s]# ls
apiserver.sh              etcd-v3.3.10-linux-amd64.tar.gz
controller-manager.sh     kubernetes
etcd-cert                 kubernetes-server-linux-amd64.tar.gz
etcd.sh                   master.zip
etcd-v3.3.10-linux-amd64  scheduler.sh
[root@server3 k8s]# mkdir kubeconfig
[root@server3 k8s]# cd kubeconfig/
[root@server3 kubeconfig]# ls
[root@server3 kubeconfig]# rz -E
rz waiting to receive.
[root@server3 kubeconfig]# ls
kubeconfig.sh
[root@server3 kubeconfig]# mv kubeconfig.sh kubeconfig
[root@server3 kubeconfig]# ls
kubeconfig

获取token信息
[root@server3 kubeconfig]# cat /opt/kubernetes/cfg/token.csv 
9c8a6669d8f96432b6ecc3007e169d59,kubelet-bootstrap,10001,"system:kubelet-bootstrap"

配置文件修改为tokenID
设置客户端认证参数
[root@server3 kubeconfig]# vim kubeconfig 
修改
kubectl config set-credentials kubelet-bootstrap \
  --token=9c8a6669d8f96432b6ecc3007e169d59 \
  --kubeconfig=bootstrap.kubeconfig

设置环境变量（可以写入到/etc/profile中）
[root@server3 kubeconfig]# export PATH=$PATH:/opt/kubernetes/bin/
[root@server3 kubeconfig]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-0               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}   
etcd-2               Healthy   {"health":"true"}  

[root@server3 kubeconfig]# bash kubeconfig 192.168.188.30 /root/k8s/k8s-cert/
Cluster "kubernetes" set.
User "kubelet-bootstrap" set.
Context "default" created.
Switched to context "default".
Cluster "kubernetes" set.
User "kube-proxy" set.
Context "default" created.
Switched to context "default".


[root@master kubeconfig]# ls
bootstrap.kubeconfig  kubeconfig  kube-proxy.kubeconfig


拷贝配置文件到node节点

[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.188.40:/opt/kubernetes/cfg/
root@192.168.188.40's password: 
bootstrap.kubeconfig             100% 2168     2.6MB/s   00:00    
kube-proxy.kubeconfig            100% 6270     8.3MB/s   00:00    
[root@master kubeconfig]# scp bootstrap.kubeconfig kube-proxy.kubeconfig root@192.168.188.50:/opt/kubernetes/cfg
root@192.168.188.50's password: 
bootstrap.kubeconfig             100% 2168     1.7MB/s   00:00    
kube-proxy.kubeconfig            100% 6270     7.3MB/s   00:00 


创建bootstrap角色赋予权限用于连接apiserver请求签名（关键）
[root@master kubeconfig]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created


在node01节点上操作

[root@node01 ~]# bash kubelet.sh 192.168.188.40
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.

检查kubelet服务启动
[root@node01 ~]# ps aux | grep kube


master上操作
检查到node01节点的请求
[root@master kubeconfig]# kubectl get csr
NAME                                                   AGE     REQUESTOR           CONDITION
node-csr-kPSxcBFoxgDNEF0QSrqvRJyYb9AC3eIvuU75NCew08c   2m16s   kubelet-bootstrap   Pending

[root@master kubeconfig]# kubectl certificate approve node-csr-kPSxcBFoxgDNEF0QSrqvRJyYb9AC3eIvuU75NCew08c
certificatesigningrequest.certificates.k8s.io/node-csr-kPSxcBFoxgDNEF0QSrqvRJyYb9AC3eIvuU75NCew08c approved

继续查看证书状态

[root@master kubeconfig]# kubectl get csr
NAME                                                   AGE     REQUESTOR           CONDITION
node-csr-kPSxcBFoxgDNEF0QSrqvRJyYb9AC3eIvuU75NCew08c   7m17s   kubelet-bootstrap   Approved,Issued（已经被允许加入群集）

查看群集节点，成功加入node01节点
[root@master kubeconfig]# kubectl get node
NAME             STATUS   ROLES    AGE     VERSION
192.168.188.40   Ready    <none>   2m23s   v1.12.3

在node01节点操作，启动proxy服务
[root@node01 ~]# bash proxy.sh 192.168.188.40
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.
[root@node01 ~]# systemctl status kube-proxy.service 
● kube-proxy.service - Kubernetes Proxy
   Loaded: loaded (/usr/lib/systemd/system/kube-proxy.service; enabled; vendor preset: disabled)
   Active: active (running) since 三 2021-03-24 19:49:01 CST; 8s ago
 Main PID: 49173 (kube-proxy)
   Memory: 8.2M
   CGroup: /system.slice/kube-proxy.service
           ‣ 49173 /opt/kubernetes/bin/kube-proxy --logtostderr=...

3月 24 19:49:01 node01 kube-proxy[49173]: I0324 19:49:01.888286...
3月 24 19:49:02 node01 kube-proxy[49173]: I0324 19:49:02.050917...
3月 24 19:49:03 node01 kube-proxy[49173]: I0324 19:49:03.656172...
3月 24 19:49:04 node01 kube-proxy[49173]: I0324 19:49:04.058129...
3月 24 19:49:05 node01 kube-proxy[49173]: I0324 19:49:05.663194...
3月 24 19:49:06 node01 kube-proxy[49173]: I0324 19:49:06.067486...
3月 24 19:49:07 node01 kube-proxy[49173]: I0324 19:49:07.669626...
3月 24 19:49:08 node01 kube-proxy[49173]: I0324 19:49:08.073782...
3月 24 19:49:09 node01 kube-proxy[49173]: I0324 19:49:09.676159...
3月 24 19:49:10 node01 kube-proxy[49173]: I0324 19:49:10.080562...
Hint: Some lines were ellipsized, use -l to show in full.

node02节点部署

在node01节点操作
把现成的/opt/kubernetes目录复制到其他节点进行修改即可

[root@node01 ~]# scp -r /opt/kubernetes/ root@192.168.188.50:/opt/
The authenticity of host '192.168.188.50 (192.168.188.50)' can't be established.
ECDSA key fingerprint is SHA256:wAcqk/TBiiofR+EeUwdTTPdsPerfoNlENEcXbZIGlc0.
ECDSA key fingerprint is MD5:10:d1:dc:b3:44:7f:b6:dd:b1:4b:24:5e:ed:3a:81:27.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.188.50' (ECDSA) to the list of known hosts.
root@192.168.188.50's password: 
flanneld                         100%  238   704.1KB/s   00:00    
bootstrap.kubeconfig             100% 2168     4.7MB/s   00:00    
kube-proxy.kubeconfig            100% 6270    13.4MB/s   00:00    
kubelet                          100%  378   636.0KB/s   00:00    
kubelet.config                   100%  268   503.1KB/s   00:00    
kubelet.kubeconfig               100% 2297     3.5MB/s   00:00    
kube-proxy                       100%  190   337.2KB/s   00:00    
mk-docker-opts.sh                100% 2139     4.3MB/s   00:00    
scp: /opt//kubernetes/bin/flanneld: Text file busy
kubelet                          100%  168MB 150.7MB/s   00:01    
kube-proxy                       100%   48MB 156.0MB/s   00:00    
kubelet.crt                      100% 2193     1.8MB/s   00:00    
kubelet.key                      100% 1679     2.4MB/s   00:00    
kubelet-client-2021-03-24-19-45- 100% 1277   368.1KB/s   00:00    
kubelet-client-current.pem       100% 1277   362.5KB/s   00:00 


把kubelet，kube-proxy的service文件拷贝到node2中
[root@node01 ~]# scp /usr/lib/systemd/system/{kubelet,kube-proxy}.service root@192.168.188.50:/usr/lib/systemd/system/
root@192.168.188.50's password: 
kubelet.service                  100%  264   313.9KB/s   00:00    
kube-proxy.service               100%  231   243.9KB/s   00:00 

在node02上操作，进行修改
首先删除复制过来的证书，等会node02会自行申请证书
[root@node02 ~]# cd /opt/kubernetes/ssl/
[root@node02 ssl]# rm -rf *

修改配置文件kubelet  kubelet.config kube-proxy（三个配置文件）
[root@node02 ssl]# cd ../cfg/
[root@node02 cfg]# vim kubelet


KUBELET_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=192.168.188.50 \
--kubeconfig=/opt/kubernetes/cfg/kubelet.kubeconfig \
--bootstrap-kubeconfig=/opt/kubernetes/cfg/bootstrap.kubeconfig \
--config=/opt/kubernetes/cfg/kubelet.config \
--cert-dir=/opt/kubernetes/ssl \
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google-containers/pause-amd64:3.0"

[root@node02 cfg]# vim kubelet.config 


kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: 192.168.188.50
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.0.0.2
clusterDomain: cluster.local.
failSwapOn: false
authentication:
  anonymous:
    enabled: true


[root@node02 cfg]# vim kube-proxy


KUBE_PROXY_OPTS="--logtostderr=true \
--v=4 \
--hostname-override=192.168.188.50 \
--cluster-cidr=10.0.0.0/24 \
--proxy-mode=ipvs \
--kubeconfig=/opt/kubernetes/cfg/kube-proxy.kubeconfig"

启动服务
[root@node02 cfg]# systemctl start kubelet.service 
[root@node02 cfg]# systemctl enable kubelet.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.

[root@node02 cfg]# systemctl start kube-proxy.service 
[root@node02 cfg]# systemctl enable kube-proxy.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.

在master上操作查看请求
[root@master k8s]# kubectl get csr
NAME                                                   AGE   REQUESTOR           CONDITION
node-csr-_hN7TuvCmeJ_oOHuED39v_65VUNMaON76np8-HRqRE4   84s   kubelet-bootstrap   Pending
node-csr-kPSxcBFoxgDNEF0QSrqvRJyYb9AC3eIvuU75NCew08c   27m   kubelet-bootstrap   Approved,Issued

授权许可加入群集
[root@master k8s]# kubectl certificate approve node-csr-_hN7TuvCmeJ_oOHuED39v_65VUNMaON76np8-HRqRE4
certificatesigningrequest.certificates.k8s.io/node-csr-_hN7TuvCmeJ_oOHuED39v_65VUNMaON76np8-HRqRE4 approved
[root@master k8s]# kubectl get node
NAME             STATUS   ROLES    AGE   VERSION
192.168.188.40   Ready    <none>   22m   v1.12.3
192.168.188.50   Ready    <none>   11s   v1.12.3