搭建一个完整的Kubernetes集群--自签APIServer SSL证书+master1配置

2021-08-01 07:15:55

生成apiserver证书!

vim ca-csr.json

{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}


vim ca-config.json
{
  "signing": {
    "default": {
      "expiry": "876000h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "876000h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}

创建CA配置json文件

创建apiserver证书的所需配置文件

vim kube-proxy-csr.json
{
  "CN": "system:kube-proxy",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "k8s",
      "OU": "System"
    }
  ]
}


vim server-csr.json
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local",
      "10.100.97.55",
      "10.100.97.78",
      "10.100.97.79",
      "10.100.97.80",
      "10.100.97.81",
      "10.100.97.82",
      "10.100.97.83"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}

.
├── ca-config.json
├── ca-csr.json
├── kube-proxy-csr.json
└── server-csr.json

生产证书

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

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

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

部署master

二进制包下载地址：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.16.md#v1161

mkdir -p /opt/kubernetes/{bin,cfg,k8s,ssl}
wget "https://dl.k8s.io/v1.16.1/kubernetes-server-linux-amd64.tar.gz"
tar xvf kubernetes-server-linux-amd64.tar.gz
cp  *.pem /opt/kubernetes/ssl/
cp /usr/local/src/kubernetes/server/bin/{kube-apiserver,kube-controller-manager,kube-scheduler,kubectl} /opt/kubernetes/bin/

二进制文件位置：kubernetes/server/bin


创建配置文件 /opt/kubernetes/cfg/
#####
vim kube-apiserver.conf 

KUBE_APISERVER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--etcd-servers=https://10.100.97.78:2379,https://10.100.97.79:2379,https://10.100.97.55:2379 \
--bind-address=10.100.97.78 \
--secure-port=6443 \
--advertise-address=10.100.97.78 \
--allow-privileged=true \
--service-cluster-ip-range=10.0.0.0/24 \
--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"


#####
vim kube-controller-manager.conf 

KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect=true \
--master=127.0.0.1:8080 \
--address=127.0.0.1 \
--allocate-node-cidrs=true \
--cluster-cidr=192.244.0.0/16 \
--service-cluster-ip-range=192.0.0.0/24 \
--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"


#####
vim kube-scheduler.conf

KUBE_SCHEDULER_OPTS="--logtostderr=false \
--v=2 \
--log-dir=/opt/kubernetes/logs \
--leader-elect \
--master=127.0.0.1:8080 \
--address=127.0.0.1"

创建启动文件到/usr/lib/systemd/system


##########cat kube-apiserver.service
[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



######################
cat kube-controller-manager.service 
[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

########################
cat kube-scheduler.service 
[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
###############

启用TLS Bootstrapping
vim /opt/kubernetes/cfg/token.csv





[root@master1 cfg]# tree /opt/kubernetes/

├── bin
│   ├── kube-apiserver
│   ├── kube-controller-manager
│   ├── kubectl
│   └── kube-scheduler
├── cfg
│   ├── kube-apiserver.conf
│   ├── kube-controller-manager.conf
│   ├── kube-scheduler.conf
│   └── token.csv
├── k8s
└── ssl
    ├── ca-key.pem
    ├── ca.pem
    ├── kube-proxy-key.pem
    ├── kube-proxy.pem
    ├── server-key.pem
    └── server.pem






##################
手动启动可以检测参数是否有错误
/opt/kubernetes/bin/kube-apiserver  --logtostderr=true --v=2 --log-dir=/opt/kubernetes/logs --etcd-servers=https://10.100.97.78:2379,https://10.100.97.79:2379,https://10.100.97.55:2379 --bind-address=10.100.97.78 --secure-port=6443 --advertise-address=10.100.97.78 --allow-privileged=true --service-cluster-ip-range=10.0.0.0/24 --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

systemctl start kube-apiserver
systemctl start kube-controller-manager
systemctl start kube-scheduler
systemctl enable kube-apiserver
systemctl enable kube-controller-manager
systemctl enable kube-scheduler

head -c 16 /dev/urandom | od -An -t x | tr -d ' '

cat /opt/kubernetes/cfg/token.csv

de540eb9cde3bcccfedb764f7a89c7cd,kubelet-bootstrap,10001,"system:node-bootstrapper"

格式：token,用户,uid,用户组

给kubelet-bootstrap授权：

kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap


apiserver配置的token必须要与node节点bootstrap.kubeconfig配置里一致。

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