k8s之二進制安裝

官方提供了三種安裝方式

minikubeMinikube

是一個工具，能夠在本地快速運行一個單點的Kubernetes，僅用於嘗試Kubernetes或平常開發的用戶使用。部署地址：https://kubernetes.io/docs/setup/minikube/

kubeadmKubeadm

也是一個工具，提供kubeadm init和kubeadm join，用於快速部署Kubernetes集羣。部署地址：https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm/

二進制包推薦

從官方下載發行版的二進制包，手動部署每一個組件，組成Kubernetes集羣。下載地址：https://github.com/kubernetes/kubernetes/releases

咱們選擇二進制包安裝

1、規劃服務器

主機	ip	做用
master 01	192.168.13.134	master01節點
master 02	192.168.13.135	master01節點
etcd 01	192.168.13.134	數據庫01節點
etcd 02	192.168.13.135	數據庫02節點
etcd 03	192.168.13.136	數據庫03節點
node01	192.168.13.134	node01節點
node02	192.168.13.135	node02節點
node03	192.168.13.136	node03節點
slb01	192.168.13.134	負載均衡主節點
slb02	192.168.13.135	負載均衡備節點

生產環境雙master高可用，數據庫最少三臺，奇數增長。node節點最少五個，能夠用雲服務器SLB進行負載均衡，也可使用nginx+keepa高可用。

1.一、部署Etcd集羣

1.1.一、生成Etcd SSL自簽證書

使用cfssl來生成自簽證書，先下載cfssl工具

curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /usr/local/bin/cfssl
curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /usr/local/bin/cfssljson
curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /usr/local/bin/cfssl-certinfo
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson /usr/local/bin/cfssl-certinfo

建立如下三個文件，用來生成證書

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

# cat ca-csr.json
{
    "CN": "etcd CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "Beijing",
            "ST": "Beijing"
        }
    ]
}

# cat server-csr.json
{
    "CN": "etcd",
    "hosts": [
    "192.168.13.134",
    "192.168.13.135",
    "192.168.13.136"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}

生成證書

cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=www server-csr.json | cfssljson -bare server
# ls *pem
ca-key.pem  ca.pem  server-key.pem  server.pem

1.1.二、部署Etcd集羣

二進制包下載地址：https://github.com/etcd-io/etcd/releases
如下部署步驟在規劃的三個etcd節點操做同樣，惟一不一樣的是etcd配置文件中的服務器IP要寫當前的
解壓二進制包：

# mkdir /opt/etcd/{bin,cfg,ssl} -p
# tar zxvf etcd-v3.2.12-linux-amd64.tar.gz
# mv etcd-v3.2.12-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/

建立etcd配置文件

# cat /opt/etcd/cfg/etcd   
#[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.13.134:2380"       #本機ip地址，server端口
ETCD_LISTEN_CLIENT_URLS="https://192.168.13.134:2379"    #本機ip地址，數據庫端口

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.13.134:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.13.134:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://192.168.13.134:2380,etcd02=https://192.168.13.135:2380,etcd03=https://192.168.13.136:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"

• ETCD_NAME #節點名稱
• ETCD_DATA_DIR #數據目錄
• ETCD_LISTEN_PEER_URLS #集羣通訊監聽地址
• ETCD_LISTEN_CLIENT_URLS #客戶端訪問監聽地址
• ETCD_INITIAL_ADVERTISE_PEER_URLS #集羣通告地址
• ETCD_ADVERTISE_CLIENT_URLS #客戶端通告地址
• ETCD_INITIAL_CLUSTER #集羣節點地址
• ETCD_INITIAL_CLUSTER_TOKEN #集羣Token
• ETCD_INITIAL_CLUSTER_STATE 加入#集羣的當前狀態，new是新集羣，existing表示加入已有集羣
systemd管理etcd：

# cat /usr/lib/systemd/system/etcd.service 
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd
ExecStart=/opt/etcd/bin/etcd \
--name=${ETCD_NAME} \
--data-dir=${ETCD_DATA_DIR} \
--listen-peer-urls=${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=${ETCD_LISTEN_CLIENT_URLS},http://127.0.0.1:2379 \
--advertise-client-urls=${ETCD_ADVERTISE_CLIENT_URLS} \
--initial-advertise-peer-urls=${ETCD_INITIAL_ADVERTISE_PEER_URLS} \
--initial-cluster=${ETCD_INITIAL_CLUSTER} \
--initial-cluster-token=${ETCD_INITIAL_CLUSTER_TOKEN} \
--initial-cluster-state=new \
--cert-file=/opt/etcd/ssl/server.pem \
--key-file=/opt/etcd/ssl/server-key.pem \
--peer-cert-file=/opt/etcd/ssl/server.pem \
--peer-key-file=/opt/etcd/ssl/server-key.pem \
--trusted-ca-file=/opt/etcd/ssl/ca.pem \
--peer-trusted-ca-file=/opt/etcd/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
**把剛纔生成的證書拷貝到配置文件中的位置：**
# cp ca*pem server*pem /opt/etcd/ssl

注意：將完整的一份Etcd目錄，複製到其餘兩個etcd服務器，只需修改ip地址便可

最後啓動三臺etcd

# systemctl start etcd
# systemctl enable etcd

檢查健康狀態

[root@k8s-matser01 k8s]# /opt/etcd/bin/etcdctl --ca-file=/opt/etcd/ssl/ca.pem --cert-file=/opt/etcd/ssl/server.pem --key-file=/opt/etcd/ssl/server-key.pem --endpoints="https://192.168.13.134:2379,https://192.168.13.135:2379,https://192.168.13.136:2379" cluster-health

出現以下輸出，表示etcd集羣完成

member 98d5f0d49711f89d is healthy: got healthy result from https://192.168.13.135:2379
member b37efb70492212de is healthy: got healthy result from https://192.168.13.136:2379
member ffd0c8087276f422 is healthy: got healthy result from https://192.168.13.134:2379
cluster is healthy