集群规划
主机名 角色 ip
HDSS7-21.host.com kube-apiserver 192.168.12.13
HDSS7-22.host.com kube-apiserver 192.168.12.14
HDSS7-11.host.com 4层负载均衡 192.168.12.11
HDSS7-12.host.com 4层负载均衡 192.168.12.12
注意：这里192.168.12.11和192.168.12.12使用nginx做4层负载均衡器，用keepalive跑一个vip：192.168.12.10，代理两个kube-apiserver，实现高可用

1. hdss7-21安装apiserver

  1. [root@hdss7-21 certs]# cd /opt/src/
  2. [root@hdss7-21 src]# rz
  3. [root@hdss7-21 src]# tar xf kubernetes-server-linux-amd64-v1.15.2.tar.gz -C /opt/
  4. [root@hdss7-21 src]# cd ..
  5. [root@hdss7-21 opt]# mv kubernetes/ kubernetes-v1.15.2
  6. [root@hdss7-21 opt]# ln -s /opt/kubernetes-v1.15.2/ /opt/kubernetes
  7. [root@hdss7-21 opt]# cd kubernetes
  8. [root@hdss7-21 kubernetes]# rm -rf kubernetes-src.tar.gz 
  9. [root@hdss7-21 kubernetes]# cd server/bin/
  10. [root@hdss7-21 bin]# rm -rf *.tar
  11. [root@hdss7-21 bin]# rm -rf *_tag
  12. 签发apiserver-client证书：apiserver与etc通信用的证书。apiserver是客户端，etcd是服务端
  13. 运维主机HDSS-200.host.com上
  14. [root@hdss7-21 bin]#  cd /opt/kubernetes/server/bin/
  15. [root@hdss7-21 bin]# mkdir cert
  16. [root@hdss7-21 bin]# cd cert/
  17. [root@hdss7-21 cert]# ls
  18. [root@hdss7-21 cert]# scp hdss7-200:/opt/certs/ca.pem . 
  19. root@hdss7-200's password: 
  20. ca.pem                                                          100% 1334   505.1KB/s   00:00    
  21. [root@hdss7-21 cert]# scp hdss7-200:/opt/certs/apiserver.pem ./
  22. root@hdss7-200's password: 
  23. apiserver.pem                                                   100% 1586   913.6KB/s   00:00    
  24. [root@hdss7-21 cert]# scp hdss7-200:/opt/certs/apiserver-key.pem ./
  25. root@hdss7-200's password: 
  26. apiserver-key.pem                                               100% 1675   711.1KB/s   00:00    
  27. [root@hdss7-21 cert]# scp hdss7-200:/opt/certs/ca-key.pem ./
  28. root@hdss7-200's password: 
  29. ca-key.pem                                                      100% 1679     1.3MB/s   00:00    
  30. [root@hdss7-21 cert]# scp hdss7-200:/opt/certs/client-key.pem ./
  31. root@hdss7-200's password: 
  32. client-key.pem                                                  100% 1679   749.7KB/s   00:00    
  33. [root@hdss7-21 cert]#  scp hdss7-200:/opt/certs/client.pem ./
  34. root@hdss7-200's password: 
  35. client.pem
  36. [root@hdss7-21 bin]#  mkdir conf
  37. [root@hdss7-21 bin]# cd /opt/kubernetes/server/bin/conf
  38. [root@hdss7-21 conf]#  vi audit.yaml
  39. [root@hdss7-21 conf]# cat audit.yaml 
  40. apiVersion: audit.k8s.io/v1beta1 # This is required.
  41. kind: Policy
  42. # Don't generate audit events for all requests in RequestReceived stage.
  43. omitStages:
  44.   - "RequestReceived"
  45. rules:
  46.   # Log pod changes at RequestResponse level
  47.   - level: RequestResponse
  48.     resources:
  49.     - group: ""
  50.       # Resource "pods" doesn't match requests to any subresource of pods,
  51.       # which is consistent with the RBAC policy.
  52.       resources: ["pods"]
  53.   # Log "pods/log", "pods/status" at Metadata level
  54.   - level: Metadata
  55.     resources:
  56.     - group: ""
  57.       resources: ["pods/log", "pods/status"]
  59.   # Don't log requests to a configmap called "controller-leader"
  60.   - level: None
  61.     resources:
  62.     - group: ""
  63.       resources: ["configmaps"]
  64.       resourceNames: ["controller-leader"]
  66.   # Don't log watch requests by the "system:kube-proxy" on endpoints or services
  67.   - level: None
  68.     users: ["system:kube-proxy"]
  69.     verbs: ["watch"]
  70.     resources:
  71.     - group: "" # core API group
  72.       resources: ["endpoints", "services"]
  74.   # Don't log authenticated requests to certain non-resource URL paths.
  75.   - level: None
  76.     userGroups: ["system:authenticated"]
  77.     nonResourceURLs:
  78.     - "/api*" # Wildcard matching.
  79.     - "/version"
  81.   # Log the request body of configmap changes in kube-system.
  82.   - level: Request
  83.     resources:
  84.     - group: "" # core API group
  85.       resources: ["configmaps"]
  86.     # This rule only applies to resources in the "kube-system" namespace.
  87.     # The empty string "" can be used to select non-namespaced resources.
  88.     namespaces: ["kube-system"]
  90.   # Log configmap and secret changes in all other namespaces at the Metadata level.
  91.   - level: Metadata
  92.     resources:
  93.     - group: "" # core API group
  94.       resources: ["secrets", "configmaps"]
  96.   # Log all other resources in core and extensions at the Request level.
  97.   - level: Request
  98.     resources:
  99.     - group: "" # core API group
  100.     - group: "extensions" # Version of group should NOT be included.
  102.   # A catch-all rule to log all other requests at the Metadata level.
  103.   - level: Metadata
  104.     # Long-running requests like watches that fall under this rule will not
  105.     # generate an audit event in RequestReceived.
  106.     omitStages:
  107.       - "RequestReceived"
  108. [root@hdss7-21 conf]# 
  109. [root@hdss7-21 conf]# cat /opt/kubernetes/server/bin/kube-apiserver.sh
  110. #!/bin/bash
  111. ./kube-apiserver \
  112.   --apiserver-count 2 \
  113.   --audit-log-path /data/logs/kubernetes/kube-apiserver/audit-log \
  114.   --audit-policy-file ./conf/audit.yaml \
  115.   --authorization-mode RBAC \
  116.   --client-ca-file ./cert/ca.pem \
  117.   --requestheader-client-ca-file ./cert/ca.pem \
  118.   --enable-admission-plugins NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota \
  119.   --etcd-cafile ./cert/ca.pem \
  120.   --etcd-certfile ./cert/client.pem \
  121.   --etcd-keyfile ./cert/client-key.pem \
  122.   --etcd-servers https://192.168.12.12:2379,https://192.168.12.21:2379,https://192.168.12.22:2379 \
  123.   --service-account-key-file ./cert/ca-key.pem \
  124.   --service-cluster-ip-range 192.168.0.0/16 \
  125.   --service-node-port-range 3000-29999 \
  126.   --target-ram-mb=1024 \
  127.   --kubelet-client-certificate ./cert/client.pem \
  128.   --kubelet-client-key ./cert/client-key.pem \
  129.   --log-dir  /data/logs/kubernetes/kube-apiserver \
  130.   --tls-cert-file ./cert/apiserver.pem \
  131.   --tls-private-key-file ./cert/apiserver-key.pem \
  132.   --v 2
  133. [root@hdss7-21 conf]# chmod +x /opt/kubernetes/server/bin/kube-apiserver.sh
  134. [root@hdss7-21 conf]#  vi /etc/supervisord.d/kube-apiserver.ini
  135. [root@hdss7-21 conf]# cat /etc/supervisord.d/kube-apiserver.ini 
  136. [program:kube-apiserver-7-21]
  137. command=/opt/kubernetes/server/bin/kube-apiserver.sh            ; the program (relative uses PATH, can take args)
  138. numprocs=1                                                      ; number of processes copies to start (def 1)
  139. directory=/opt/kubernetes/server/bin                            ; directory to cwd to before exec (def no cwd)
  140. autostart=true                                                  ; start at supervisord start (default: true)
  141. autorestart=true                                                ; retstart at unexpected quit (default: true)
  142. startsecs=30                                                    ; number of secs prog must stay running (def. 1)
  143. startretries=3                                                  ; max # of serial start failures (default 3)
  144. exitcodes=0,2                                                   ; 'expected' exit codes for process (default 0,2)
  145. stopsignal=QUIT                                                 ; signal used to kill process (default TERM)
  146. stopwaitsecs=10                                                 ; max num secs to wait b4 SIGKILL (default 10)
  147. user=root                                                       ; setuid to this UNIX account to run the program
  148. redirect_stderr=true                                            ; redirect proc stderr to stdout (default false)
  149. stdout_logfile=/data/logs/kubernetes/kube-apiserver/apiserver.stdout.log        ; stderr log path, NONE for none; default AUTO
  150. stdout_logfile_maxbytes=64MB                                    ; max # logfile bytes b4 rotation (default 50MB)
  151. stdout_logfile_backups=4                                        ; # of stdout logfile backups (default 10)
  152. stdout_capture_maxbytes=1MB                                     ; number of bytes in 'capturemode' (default 0)
  153. stdout_events_enabled=false                                     ; emit events on stdout writes (default false)
  154. [root@hdss7-21 conf]# mkdir -p /data/logs/kubernetes/kube-apiserver
  155. [root@hdss7-21 conf]# supervisorctl update
  156. kube-apiserver-7-21: added process group
  157. [root@hdss7-21 conf]# supervisorctl status
  158. etcd-server-7-21                 RUNNING   pid 2753, uptime 0:53:15
  159. kube-apiserver-7-21              RUNNING   pid 2873, uptime 0:00:48

2.运维主机HDSS-200.host.com

[root@hdss7-200 certs]# cd /opt/certs/
[root@hdss7-200 certs]# ll
total 36
-rw-r--r-- 1 root root  840 Jun  6 13:03 ca-config.json
-rw-r--r-- 1 root root  989 Jun  6 11:19 ca.csr
-rw-r--r-- 1 root root  334 Jun  6 11:18 ca-csr.json
-rw------- 1 root root 1679 Jun  6 11:19 ca-key.pem
-rw-r--r-- 1 root root 1334 Jun  6 11:19 ca.pem
-rw-r--r-- 1 root root 1062 Jun  6 13:04 etcd-peer.csr
-rw-r--r-- 1 root root  379 Jun  6 13:04 etcd-peer-csr.json
-rw------- 1 root root 1679 Jun  6 13:04 etcd-peer-key.pem
-rw-r--r-- 1 root root 1424 Jun  6 13:04 etcd-peer.pem
[root@hdss7-200 certs]# vi /opt/certs/client-csr.json

{
    "CN": "k8s-node",
    "hosts": [
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}
[root@hdss7-200 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]# vi apiserver-csr.json
{
    "CN": "k8s-apiserver",
    "hosts": [
        "127.0.0.1",
        "192.254.0.1",
        "kubernetes.default",
        "kubernetes.default.svc",
        "kubernetes.default.svc.cluster",
        "kubernetes.default.svc.cluster.local",
        "192.168.12.21",
        "192.168.12.21",
        "192.168.12.23"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "beijing",
            "L": "beijing",
            "O": "od",
            "OU": "ops"
        }
    ]
}
[root@hdss7-200 certs]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=server apiserver-csr.json |cfssl-json -bare apiserver

3 hdss7-22安装apiserver

[root@hdss7-22 src]# tar xf kubernetes-server-linux-amd64-v1.15.2.tar.gz -C /opt/
[root@hdss7-22 src]# cd ..
[root@hdss7-22 opt]# ls
containerd  etcd  etcd-v3.1.20  kubernetes  src
[root@hdss7-22 opt]# mv kubernetes/ kubernetes-v1.15.2
[root@hdss7-22 opt]# ln -s /opt/kubernetes-v1.15.2/ /opt/kubernetes
[root@hdss7-22 opt]# mkdir /opt/kubernetes/server/bin/cert /opt/kubernetes/server/bin/conf
[root@hdss7-22 opt]# cd /opt/kubernetes/server/bin/cert
[root@hdss7-22 cert]#  scp hdss7-200:/opt/certs/ca.pem ./
root@hdss7-200's password: 
ca.pem                                                          100% 1334     2.5KB/s   00:00    
[root@hdss7-22 cert]#  scp hdss7-200:/opt/certs/apiserver.pem ./
root@hdss7-200's password: 
apiserver.pem                                                   100% 1586   752.4KB/s   00:00    
[root@hdss7-22 cert]#  ls
apiserver.pem  ca.pem
[root@hdss7-22 cert]# scp hdss7-200:/opt/certs/apiserver-key.pem ./
root@hdss7-200's password: 
apiserver-key.pem                                               100% 1675     1.2MB/s   00:00    
[root@hdss7-22 cert]# scp hdss7-200:/opt/certs/ca-key.pem ./
root@hdss7-200's password: 
ca-key.pem                                                      100% 1679     1.3MB/s   00:00    
[root@hdss7-22 cert]#  scp hdss7-200:/opt/certs/client-key.pem ./
root@hdss7-200's password: 
client-key.pem                                                  100% 1679   728.4KB/s   00:00    
[root@hdss7-22 cert]# scp hdss7-200:/opt/certs/client.pem ./
root@hdss7-200's password: 
client.pem   
[root@hdss7-22 conf]# vim 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"
[root@hdss7-22 conf]# vi /opt/kubernetes/server/bin/kube-apiserver.sh
#!/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 ./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://192.168.12.12:2379,https://192.168.12.21:2379,https://192.168.12.22:2379 \
  --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@hdss7-22 conf]# vi /etc/supervisord.d/kube-apiserver.ini
[root@hdss7-22 conf]#  chmod +x /opt/kubernetes/server/bin/kube-apiserver.sh
[program:kube-apiserver-7-22]
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)
[root@hdss7-22 conf]#  mkdir -p /data/logs/kubernetes/kube-apiserver
[root@hdss7-22 conf]#  supervisorctl update

[root@hdss7-22 conf]# supervisorctl status
etcd-server-7-22                 RUNNING   pid 4264, uptime 0:51:18
kube-apiserver-7-22              RUNNING   pid 4400, uptime 0:02:53

4 hdss7-11上部署nginx

[root@hdss7-11 opt]#  yum install nginx -y
nginx四层负载，必须与http同级：
[root@hdss7-11 opt]# cat /etc/nginx/nginx.conf
stream {
    upstream kube-apiserver {
        server 192.168.12.21:6443     max_fails=3 fail_timeout=30s;
        server 192.168.12.22:6443     max_fails=3 fail_timeout=30s;
    }
    server {
        listen 7443;
        proxy_connect_timeout 2s;
        proxy_timeout 900s;
        proxy_pass kube-apiserver;
    }
}
[root@hdss7-11 opt]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@hdss7-11 opt]# systemctl restart nginx
[root@hdss7-11 opt]# systemctl enable nginx

5.hdss7-12安装nginx

[root@hdss7-12 certs]#  yum install nginx -y
[root@hdss7-12 certs]# vim /etc/nginx/nginx.conf
stream {
    upstream kube-apiserver {
        server 192.168.12.21:6443     max_fails=3 fail_timeout=30s;
        server 192.168.12.22:6443     max_fails=3 fail_timeout=30s;
    }
    server {
        listen 7443;
        proxy_connect_timeout 2s;
        proxy_timeout 900s;
        proxy_pass kube-apiserver;
    }
}
[root@hdss7-12 certs]# 
[root@hdss7-12 certs]# 
[root@hdss7-12 certs]# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
[root@hdss7-12 certs]# systemctl start nginx 
[root@hdss7-12 certs]# systemctl enable nginx

6.实现keep高可用

[root@hdss7-11 opt]#  yum install keepalived -y
[root@hdss7-11 opt]# cat /etc/keepalived/check_port.sh
#!/bin/bash
CHK_PORT=$1
if [ -n "$CHK_PORT" ];then
        PORT_PROCESS=`ss -lnt|grep $CHK_PORT|wc -l`
        if [ $PORT_PROCESS -eq 0 ];then
                echo "Port $CHK_PORT Is Not Used,End."
                exit 1
        fi
else
        echo "Check Port Cant Be Empty!"
fi
[root@hdss7-11 opt]# chmod +x /etc/keepalived/check_port.sh
[root@hdss7-11 opt]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id 192.168.12.11

}

vrrp_script chk_nginx {
    script "/etc/keepalived/check_port.sh 7443"
    interval 2
    weight -20
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 251
    priority 100
    advert_int 1
    mcast_src_ip 192.168.12.11
    nopreempt   

    authentication {
        auth_type PASS
        auth_pass 11111111
    }
    track_script {
         chk_nginx
    }
    virtual_ipaddress {
        192.168.12.10
    }
}
[root@hdss7-11 opt]# systemctl start keepalived
[root@hdss7-11 opt]# systemctl enable keepalived

[root@hdss7-12 certs]# yum install keepalived -y
[root@hdss7-12 certs]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   router_id 192.168.12.11

}

vrrp_script chk_nginx {
    script "/etc/keepalived/check_port.sh 7443"
    interval 2
    weight -20
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 251
    priority 100
    advert_int 1
    mcast_src_ip 192.168.12.11
    nopreempt   

    authentication {
        auth_type PASS
        auth_pass 11111111
    }
    track_script {
         chk_nginx
    }
    virtual_ipaddress {
        192.168.12.10
    }
}

[root@hdss7-12 certs]# cat /etc/keepalived/check_port.sh 
#!/bin/bash
CHK_PORT=$1
if [ -n "$CHK_PORT" ];then
        PORT_PROCESS=`ss -lnt|grep $CHK_PORT|wc -l`
        if [ $PORT_PROCESS -eq 0 ];then
                echo "Port $CHK_PORT Is Not Used,End."
                exit 1
        fi
else
        echo "Check Port Cant Be Empty!"
fi


[root@hdss7-12 certs]# chmod +x /etc/keepalived/check_port.sh
[root@hdss7-12 certs]# systemctl start keepalived
[root@hdss7-12 certs]# systemctl enable keepalived

image.png