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。