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二 master上部署k8s元件

主要部署 三個角色 ：kube-apiserver kube-controller-manager kube-scheduler

一 生成證書（master上）

1 建立一個目錄專門存放證書 

cat > ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF

cat > ca-csr.json <<EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing",
           "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

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

#-----------------------

cat > server-csr.json <<EOF
{
    "CN": "kubernetes",
    "hosts": [
      "10.0.0.1",
      "127.0.0.1",
      "192.168.18.103",          
      "kubernetes",
      "kubernetes.default",
      "kubernetes.default.svc",
      "kubernetes.default.svc.cluster",
      "kubernetes.default.svc.cluster.local"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

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

#-----------------------

cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "L": "BeiJing",
      "ST": "BeiJing",
      "O": "system:masters",
      "OU": "System"
    }
  ]
}
EOF

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

#-----------------------

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

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

2最終生成以下證書檔案： 

[yx@tidb-tidb-03 k8sssl]$ ls *.pem
admin-key.pem admin.pem ca-key.pem ca.pem kube-proxy-key.pem kube-proxy.pem server-key.pem server.pem

二 部署apiserver元件

1 下載下傳 

mkdir /home/yx/kubernetes/{bin,cfg,ssl} -p

 tar zxvf kubernetes-server-linux-amd64.tar.gz

 cd kubernetes/server/bin

cp kube-apiserver kube-scheduler kube-controller-manager kubectl /opt/kubernetes/bin

cp ca*.pem /home/yx/kubernetes/ssl/  #拷貝證書
cp server*.pem /home/yx/kubernetes/ssl/

2 建立tocken檔案 

head -c 16 /dev/urandom |od -An -t x |tr -d ' ' 
71b6d986c47254bb0e63b2a20cfaf560

cat /opt/kubernetes/cfg/token.csv 
71b6d986c47254bb0e63b2a20cfaf560,kubelet-bootstrap,10001,"system:kubelet-bootstrap"

3 建立apiserver配置檔案,會用到你上面生成的一些證書 

cat /home/yx/kubernetes/cfg/kube-apiserver

KUBE_APISERVER_OPTS="--logtostderr=true \
--v=4 \
--etcd-servers=https://192.168.18.103:2379,https://192.168.18.104:2379,https://192.168.18.105:2379 \
--bind-address=192.168.18.103 \
--secure-port=6443 \
--advertise-address=192.168.18.103 \
--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 \
--token-auth-file=/home/yx/cfg/token.csv \
--service-node-port-range=30000-50000 \
--tls-cert-file=/home/yx/kubernetes/ssl/server.pem  \
--tls-private-key-file=/home/yx/kubernetes/ssl/server-key.pem \
--client-ca-file=/home/yx/kubernetes/ssl/ca.pem \
--service-account-key-file=/home/yx/kubernetes/ssl/ca-key.pem \
--etcd-cafile=/home/yx/etcd/ssl/ca.pem \
--etcd-certfile=/home/yx/etcd/ssl/server.pem \
--etcd-keyfile=/home/yx/etcd/ssl/server-key.pem"

--logtostderr 啟用日志
---v 日志等級
--etcd-servers etcd叢集位址
--bind-address 監聽位址
--secure-port https安全端口
--advertise-address 叢集通告位址
--allow-privileged 啟用授權
--service-cluster-ip-range Service虛拟IP位址段
--enable-admission-plugins 準入控制子產品
--authorization-mode 認證授權，啟用RBAC授權和節點自管理
--enable-bootstrap-token-auth 啟用TLS bootstrap功能，後面會講到
--token-auth-file token檔案
--service-node-port-range Service Node類型預設配置設定端口範圍

4建立啟動程式 

[yx@tidb-tidb-03 cfg]$ cat /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/home/yx/kubernetes/cfg/kube-apiserver
ExecStart=/home/yx/kubernetes/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

5 啟動kube-apiserver 

systemctl daemon-reload
systemctl enable kube-apiserver
 systemctl restart kube-apiserver
#驗證
ps -ef | grep apiserver
root 12768 1 99 14:45 ? 00:00:02 /home/yx/kubernetes/bin/kube-apiserver --logtostderr=true --v=4 --etcd-servers=https://192.168.18.103:2379,https://192.168.18.104:2379,https://192.168.18.105:2379 --bind-address=192.168.18.103 --secure-port=6443 --advertise-address=192.168.18.103 --allow-privileged=true --service-cluster-ip-range=10.0.0.0/24 --enable-admission-plugins=NamespaceLifecycle,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota,NodeRestriction --authorization-mode=RBAC,Node --enable-bootstrap-token-auth --token-auth-file=/home/yx/kubernetes/cfg/token.csv --service-node-port-range=30000-50000 --tls-cert-file=/home/yx/kubernetes/ssl/server.pem --tls-private-key-file=/home/yx/kubernetes/ssl/server-key.pem --client-ca-file=/home/yx/kubernetes/ssl/ca.pem --service-account-key-file=/home/yx/kubernetes/ssl/ca-key.pem --etcd-cafile=/home/yx/etcd/ssl/ca.pem --etcd-certfile=/home/yx/etcd/ssl/server.pem --etcd-keyfile=/home/yx/etcd/ssl/server-key.pem

三 部署kube-scheduler元件

1 建立schduler配置檔案： 

[yx@tidb-tidb-03 cfg]$ cat kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect"
--master 連接配接本地apiserver
--leader-elect 當該元件啟動多個時，自動選舉（HA）

2 配置啟動腳本 

cat kube-scheduler
KUBE_SCHEDULER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect"

[yx@tidb-tidb-03 cfg]$ cat /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/home/yx/kubernetes/cfg/kube-scheduler
ExecStart=/home/yx/kubernetes/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

3 啟動 

systemctl daemon-reload
 systemctl enable kube-scheduler
systemctl restart kube-scheduler
驗證：
ps -ef |grep scheduler
root 13296 1 0 14:49 ? 00:00:03 /home/yx/kubernetes/bin/kube-scheduler --logtostderr=true --v=4 --master=127.0.0.1:8080 --leader-elect
yx 14450 25931 0 14:57 pts/0 00:00:00 grep --color=auto scheduler

四 部署controller-manager元件

1 建立controller-manager配置檔案 

cat kube-controller-manager 
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=true \
--v=4 \
--master=127.0.0.1:8080 \
--leader-elect=true \
--address=127.0.0.1 \
--service-cluster-ip-range=10.0.0.0/24 \
--cluster-name=kubernetes \
--cluster-signing-cert-file=/home/yx/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/home/yx/kubernetes/ssl/ca-key.pem \
--root-ca-file=/home/yx/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/home/yx/kubernetes/ssl/ca-key.pem"

2配置啟動腳本 

cat /usr/lib/systemd/system/kube-controller-manager.service 
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes

[Service]
EnvironmentFile=/home/yx/kubernetes/cfg/kube-controller-manager
ExecStart=/home/yx/kubernetes/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure

[Install]
WantedBy=multi-user.target

3啟動 

systemctl daemon-reload
 systemctl enable kube-controller-manager
 systemctl restart kube-controller-manager
驗證 ps -ef |grep kube-controller-manager

五 通過kubectl工具檢視目前叢集元件狀态： 

/home/yx/kubernetes/bin/kubectl get cs
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok                   
scheduler Healthy ok                   
etcd-2 Healthy {"health": "true"}   
etcd-0 Healthy {"health": "true"}   
etcd-1 Healthy {"health": "true"} 
#出現以上資訊代表正常
kube-apiserver kube-controller-man kube-scheduler
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