Kubernetes集群大脑之apiserver

Kubernetes集群大脑之apiserver

部署实践

签发证书

请求证书文件

[root@lab-26 src]# vi /opt/certs/client-csr.json 

{
    "CN": "k8s-node",
    "hosts": [
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "op",
            "OU": "ops"
        }
    ]
}

[root@lab-26 src]# cd /opt/certs/
[root@lab-26 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client client-csr.json |cfssl-json -bare client

apiserver配置证书

[root@lab-26 certs]# vi apiserver-csr.json

# apiserver本身的证书
{
    "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",
        "172.17.152.106"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "op",
            "OU": "ops"
        }
    ]
}

[root@lab-26 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server apiserver-csr.json |cfssl-json -bare apiserver

解压配置

软件包下载链接

[root@lab-26 src]# tar xvf /opt/src/kubernetes-server-linux-amd64-v1.15.4.tar.gz -C /opt/
[root@lab-26 src]# cd /opt/
[root@lab-26 opt]# mv kubernetes/ kubernetes-v1.15.4
[root@lab-26 opt]# ln -s kubernetes-v1.15.4/ kubernetes

清理软件无用软件包

[root@lab-26 opt]# cd kubernetes
[root@lab-26 opt]# rm -rf kubernetes-src.tar.gz 
[root@lab-26 opt]# cd server/bin/
[root@lab-26 opt]# rm -rf *.tar
[root@lab-26 opt]# rm -rf *_tag

拷贝ca证书文件

[root@lab-26 opt]# cd /opt/kubernetes/server/bin/
[root@lab-26 opt]# mkdir cert
[root@lab-26 opt]# cd cert/
[root@lab-26 cert]# cp /opt/certs/ca.pem .
[root@lab-26 cert]# cp /opt/certs/client-key.pem .
[root@lab-26 cert]# cp /opt/certs/client.pem .
[root@lab-26 cert]# cp /opt/certs/apiserver.pem .
[root@lab-26 cert]# cp /opt/certs/apiserver-key.pem .
[root@lab-26 cert]# cp /opt/certs/ca-key.pem .

apiserver审计日志记录规则

[root@lab-26 cert]# mkdir /opt/kubernetes/server/bin/conf/
[root@lab-26 cert]# cd /opt/kubernetes/server/bin/conf/
[root@lab-26 conf]# vi audit.yaml

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"

服务启动文件

[root@lab-26 conf]# vi /opt/kubernetes/server/bin/kube-apiserver.sh

#!/bin/bash
./kube-apiserver \
  --apiserver-count 1 \
  --audit-log-path /data/logs/kubernetes/kube-apiserver/audit-log \
  --audit-policy-file ./conf/audit.yaml \
  --authorization-mode RBAC \
  --client-ca-file ./cert/ca.pem \
  --requestheader-client-ca-file ./cert/ca.pem \
  --enable-admission-plugins NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota \
  --etcd-cafile ./cert/ca.pem \
  --etcd-certfile ./cert/client.pem \
  --etcd-keyfile ./cert/client-key.pem \
  --etcd-servers https://172.17.152.106:2379 \
  --service-account-key-file ./cert/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 ./cert/client.pem \
  --kubelet-client-key ./cert/client-key.pem \
  --log-dir  /data/logs/kubernetes/kube-apiserver \
  --tls-cert-file ./cert/apiserver.pem \
  --tls-private-key-file ./cert/apiserver-key.pem \
  --v 2

[root@lab-26 conf]# chmod +x /opt/kubernetes/server/bin/kube-apiserver.sh

通过supervisor管理服务

[root@lab-26 conf]# vi /etc/supervisord.d/kube-apiserver.ini

[program:kube-apiserver-152-106]
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)
killasgroup=true
stopasgroup=true

[root@lab-26 conf]# mkdir -p /data/logs/kubernetes/kube-apiserver
[root@lab-26 conf]# supervisorctl update
kube-apiserver-152-106: added process group
[root@lab-26 conf]# supervisorctl status
etcd-server-152-106              RUNNING   pid 22579, uptime 1:05:37
kube-apiserver-152-106           RUNNING   pid 21423, uptime 0:00:45

至此apiserver部署完毕。