搭建一個完整的Kubernetes叢集---安裝etcd叢集

**1. 自簽Etcd SSL證書

**

伺服器規劃與元件安裝

10.100.97.78 master1

kube-apiserver

kube-controller-manager

kube-scheduler

etcd

10.100.97.79 node1

kubelet

kube-proxy

docker

10.100.97.55 node2

下載下傳cfssl工具，用于生成自簽證書

wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64 cfssl-certinfo_linux-amd64
mv cfssl_linux-amd64 /usr/bin/cfssl
mv cfssljson_linux-amd64 /usr/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo           

建立證書json檔案

mkdir etcd_ca
cd etcd_ca           

建立 Etcd根證書配置檔案

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

建立 Etcd根證書請求檔案

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

建立 Etcd服務證書請求檔案

cat > server-csr.json <<EOF
{
    "CN": "etcd",
    "hosts": [
        "10.100.97.78",
        "10.100.97.79",
        "10.100.97.55"
        ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}
EOF           

├── ca-config.json

├── ca-csr.json

└── server-csr.json

生成 Etcd根證書

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

生成 Etcd服務證書

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

2.部署三個Etcd節點

下載下傳etcd二進制包

wget https://github.com/etcd-io/etcd/releases/download/v3.3.18/etcd-v3.3.18-linux-amd64.tar.gz"
mkdir /opt/etcd/{bin,cfg,ssl} -p
tar zxvf etcd-v3.3.18-linux-amd64.tar.gz
mv etcd-v3.3.18-linux-amd64/{etcd,etcdctl} /opt/etcd/bin/
cp ~/etcd_ca/*.pem /opt/etcd/ssl/
           

建立啟動eted配置檔案

vim 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
           

上面啟動報錯（ conflicting environment variable "ETCD_NAME" is shadowed by corresponding command-line flag (either unset environment variable or disable flag)），可去掉NAME

[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
EnvironmentFile=/opt/etcd/cfg/etcd.conf
ExecStart=/opt/etcd/bin/etcd \
--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
           

建立etcd配置檔案

#[Member]
ETCD_NAME="etcd01"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://10.100.97.78:2380"    
ETCD_LISTEN_CLIENT_URLS="https://10.100.97.78:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://10.100.97.78:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://10.100.97.78:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://10.100.97.78:2380,etcd02=https://10.100.97.79:2380,etcd03=https://10.100.97.55:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"



#參數說明
ETCD_NAME 節點名稱
ETCD_DATA_DIR 資料目錄
ETCD_LISTEN_PEER_URLS 叢集通信監聽位址
ETCD_LISTEN_CLIENT_URLS 用戶端通路監聽位址
ETCD_INITIAL_ADVERTISE_PEER_URLS 叢集通告位址
ETCD_ADVERTISE_CLIENT_URLS 用戶端通告位址
ETCD_INITIAL_CLUSTER 叢集節點位址
ETCD_INITIAL_CLUSTER_TOKEN 叢集Token
ETCD_INITIAL_CLUSTER_STATE 加入叢集的目前狀态，new是新叢集，existing表示加入已有叢集           

分别拷貝到另外二個節點

scp -r /opt/etcd/ [email protected]:/opt/
scp -r /opt/etcd/ [email protected]:/opt/

scp /usr/local/src/etcd.service [email protected]:/usr/lib/systemd/system
scp /usr/local/src/etcd.service [email protected]:/usr/lib/systemd/system           

登陸二個節點修改配置檔案 名稱和IP

systemctl daemon-reload
systemctl start etcd
systemctl enable etcd 

 /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://10.100.97.78:2379,https://10.100.97.79:2379,https://10.100.97.55:2379" cluster-health