二进制部署K8S集群（七）Master节点之kubeapiserver集群部署

目录

• 1.集群规划
• 2.创建生成client证书csr的json配置文件
• 3.生成apiserver的client证书文件
• 4.创建生成服务器端证书csr的json配置文件
• 5.生成apiserver的服务器证书文件
• 6.软件下载解压
• 7.拷贝证书
• 8.创建配置
• 9.创建apiserver启动脚本
• 10.创建supervisor配置
• 11.启动服务并检查

1.集群规划

主机名	IP	角色	节点
hdss7-21.host.com	10.4.7.21	kube-apiserver	master
hdss7-22.host.com	10.4.7.22	kube-apiserver	master

2.创建生成client证书csr的json配置文件

在hdss7-200主机上操作：

cat > /opt/certs/client-csr.json <<'eof'
{
    "CN": "k8s-node",
    "hosts": [
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "GuangZhou",
            "L": "GuangZhou",
            "O": "k8s",
            "OU": "yw"
        }
    ]
}
eof

3.生成apiserver的client证书文件

cd /opt/certs/
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client client-csr.json | cfssl-json -bare client
[root@hdss7-200 certs]# ll client*
-rw-r--r--. 1 root root  997 9月  20 02:22 client.csr
-rw-r--r--. 1 root root  284 9月  20 02:22 client-csr.json
-rw-------. 1 root root 1679 9月  20 02:22 client-key.pem
-rw-r--r--. 1 root root 1375 9月  20 02:22 client.pem

4.创建生成服务器端证书csr的json配置文件

cat > /opt/certs/apiserver-csr.json <<'eof'
{
    "CN": "k8s-apiserver",
    "hosts": [
        "127.0.0.1",
        "192.168.0.1",
        "kubernetes.default",
        "kubernetes.default.svc",
        "kubernetes.default.svc.cluster",
        "kubernetes.default.svc.cluster.local",
        "10.4.7.10",
        "10.4.7.21",
        "10.4.7.22",
        "10.4.7.23"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "GuangZhou",
            "L": "GuangZhou",
            "O": "k8s",
            "OU": "yw"
        }
    ]
}
eof

hosts里的IP代表哪些主机可能会安装apiserver

5.生成apiserver的服务器证书文件

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server apiserver-csr.json |cfssl-json -bare apiserver
[root@hdss7-200 certs]# ll apiserver*
-rw-r--r--. 1 root root 1257 9月  20 02:11 apiserver.csr
-rw-r--r--. 1 root root  570 9月  20 02:10 apiserver-csr.json
-rw-------. 1 root root 1679 9月  20 02:11 apiserver-key.pem
-rw-r--r--. 1 root root 1610 9月  20 02:11 apiserver.pem

6.软件下载解压

以host7-21主机操作为例，host7-22操作类似
下载地址：https://github.com/kubernetes/kubernetes/releases

cd /opt/src
rz  ==> kubernetes-server-linux-amd64.tar.gz
tar xf kubernetes-server-linux-amd64.tar.gz -C /opt
cd /opt
mv kubernetes/ kubernetes-v1.19.2
ln -s /opt/kubernetes-v1.19.2/ /opt/kubernetes
cd /opt/kubernetes
rm -rf kubernetes-src.tar.gz
cd server/bin
rm -f *.tar *_tag

7.拷贝证书

mkdir /opt/kubernetes/server/bin/certs
mkdir /opt/kubernetes/server/bin/conf
scp hdss7-200:/opt/certs/ca.pem /opt/kubernetes/server/bin/certs
scp hdss7-200:/opt/certs/ca-key.pem /opt/kubernetes/server/bin/certs
scp hdss7-200:/opt/certs/client.pem /opt/kubernetes/server/bin/certs
scp hdss7-200:/opt/certs/client-key.pem /opt/kubernetes/server/bin/certs
scp hdss7-200:/opt/certs/apiserver.pem /opt/kubernetes/server/bin/certs
scp hdss7-200:/opt/certs/apiserver-key.pem /opt/kubernetes/server/bin/certs

8.创建配置

cat > /opt/kubernetes/server/bin/conf/audit.yaml <<'eof'
apiVersion: audit.k8s.io/v1beta1 # This is required.
kind: Policy
# Don't generate audit events for all requests in RequestReceived stage.
omitStages:
  - "RequestReceived"
rules:
  # Log pod changes at RequestResponse level
  - level: RequestResponse
    resources:
    - group: ""
      # Resource "pods" doesn't match requests to any subresource of pods,
      # which is consistent with the RBAC policy.
      resources: ["pods"]
  # Log "pods/log", "pods/status" at Metadata level
  - level: Metadata
    resources:
    - group: ""
      resources: ["pods/log", "pods/status"]

  # Don't log requests to a configmap called "controller-leader"
  - level: None
    resources:
    - group: ""
      resources: ["configmaps"]
      resourceNames: ["controller-leader"]

  # Don't log watch requests by the "system:kube-proxy" on endpoints or services
  - level: None
    users: ["system:kube-proxy"]
    verbs: ["watch"]
    resources:
    - group: "" # core API group
      resources: ["endpoints", "services"]

  # Don't log authenticated requests to certain non-resource URL paths.
  - level: None
    userGroups: ["system:authenticated"]
    nonResourceURLs:
    - "/api*" # Wildcard matching.
    - "/version"

  # Log the request body of configmap changes in kube-system.
  - level: Request
    resources:
    - group: "" # core API group
      resources: ["configmaps"]
    # This rule only applies to resources in the "kube-system" namespace.
    # The empty string "" can be used to select non-namespaced resources.
    namespaces: ["kube-system"]

  # Log configmap and secret changes in all other namespaces at the Metadata level.
  - level: Metadata
    resources:
    - group: "" # core API group
      resources: ["secrets", "configmaps"]

  # Log all other resources in core and extensions at the Request level.
  - level: Request
    resources:
    - group: "" # core API group
    - group: "extensions" # Version of group should NOT be included.

  # A catch-all rule to log all other requests at the Metadata level.
  - level: Metadata
    # Long-running requests like watches that fall under this rule will not
    # generate an audit event in RequestReceived.
    omitStages:
      - "RequestReceived"
eof

9.创建apiserver启动脚本

cat > /opt/kubernetes/server/bin/kube-apiserver.sh <<'eof'
#!/bin/bash
./kube-apiserver \
  --apiserver-count 2 \
  --audit-log-path /data/logs/kubernetes/kube-apiserver/audit-log \
  --audit-policy-file ./conf/audit.yaml \
  --authorization-mode RBAC \
  --client-ca-file ./certs/ca.pem \
  --requestheader-client-ca-file ./certs/ca.pem \
  --enable-admission-plugins NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota \
  --etcd-cafile ./certs/ca.pem \
  --etcd-certfile ./certs/client.pem \
  --etcd-keyfile ./certs/client-key.pem \
  --etcd-servers https://10.4.7.12:2379,https://10.4.7.21:2379,https://10.4.7.22:2379 \
  --service-account-key-file ./certs/ca-key.pem \
  --service-cluster-ip-range 192.168.0.0/16 \
  --service-node-port-range 3000-29999 \
  --target-ram-mb=1024 \
  --kubelet-client-certificate ./certs/client.pem \
  --kubelet-client-key ./certs/client-key.pem \
  --log-dir  /data/logs/kubernetes/kube-apiserver \
  --tls-cert-file ./certs/apiserver.pem \
  --tls-private-key-file ./certs/apiserver-key.pem \
	----allow-privileged \
  --v 2
eof
mkdir -p /data/logs/kubernetes/kube-apiserver
chmod +x /opt/kubernetes/server/bin/kube-apiserver.sh 

10.创建supervisor配置

cat > /etc/supervisord.d/kube-apiserver.ini <<eof
[program:kube-apiserver-7-21]
command=/opt/kubernetes/server/bin/kube-apiserver.sh            ; the program (relative uses PATH, can take args)
numprocs=1                                                      ; number of processes copies to start (def 1)
directory=/opt/kubernetes/server/bin                            ; directory to cwd to before exec (def no cwd)
autostart=true                                                  ; start at supervisord start (default: true)
autorestart=true                                                ; retstart at unexpected quit (default: true)
startsecs=30                                                    ; number of secs prog must stay running (def. 1)
startretries=3                                                  ; max # of serial start failures (default 3)
exitcodes=0,2                                                   ; 'expected' exit codes for process (default 0,2)
stopsignal=QUIT                                                 ; signal used to kill process (default TERM)
stopwaitsecs=10                                                 ; max num secs to wait b4 SIGKILL (default 10)
user=root                                                       ; setuid to this UNIX account to run the program
redirect_stderr=true                                            ; redirect proc stderr to stdout (default false)
stdout_logfile=/data/logs/kubernetes/kube-apiserver/apiserver.stdout.log        ; stderr log path, NONE for none; default AUTO
stdout_logfile_maxbytes=64MB                                    ; max # logfile bytes b4 rotation (default 50MB)
stdout_logfile_backups=4                                        ; # of stdout logfile backups (default 10)
stdout_capture_maxbytes=1MB                                     ; number of bytes in 'capturemode' (default 0)
stdout_events_enabled=false                                     ; emit events on stdout writes (default false)
eof

注：不同的地方[program:kube-apiserver-7-21]

11.启动服务并检查

supervisorctl update
supervisorctl status
netstat -nltup|grep kube-api
tcp        0      0 127.0.0.1:8080          0.0.0.0:*               LISTEN      12497/./kube-apiser 
tcp6       0      0 :::6443                 :::*                    LISTEN      12497/./kube-apiser