kubernetes容器叢集搭建(二、etcd搭建)

二、第三方ECTD資料庫叢集搭建

自簽TLS證書

安裝證書生成工具cfssl

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/local/bin/cfssl

mv cfssljson_linux-amd64 /usr/local/bin/cfssljson

mv cfssl-certinfo_linux-amd64 /usr/bin/cfssl-certinfo

部署etcd叢集

資源下載下傳

• 下載下傳安裝包

  https://github.com/coreos/etcd/releases/tag/v3.2.12

• 解壓包

  tar -zxvf etcd-v3.2.12-linux-amd64.tar.gz

• 建立etcd資源檔案夾

  mkdir -p /opt/etcd/{bin,ssl,cfg}

• 将etcd檔案夾中的etcd & etcdctl兩個可執行檔案移動到/opt/etcd/bin/目錄下

  cd etcd…

  mv etcd etcdctl /opt/etcd/bin/

自簽etcd證書

• 初始化ca機構配置,生成ca-key.pem,ca.pem

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 -
           

• 初始etcd服務配置，并生成server.pem,server-key.pem

cat > server-csr.json <<EOF
{
    "CN": "kubernetes",
    "hosts": [
      "192.168.10.1",
      "192.168.10.2",
      "192.168.10.3",
      "192.168.10.4",
      "192.168.10.5"
    ],
    "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
           

• 将證書複制到/opt/etcd/ssl/ 目錄下

  mv {ca,server,server-key}.pem /opt/etcd/ssl/

• 編輯etcd配置及其啟動服務etcd.service,shell腳本如下

ETCD_NAME="etcd01"    # 節點名
ETCD_IP="192.168.10.1"         # 目前節點ip
ETCD_CLUSTER="https://192.168.10.1,https://192.168.10.2,https://192.168.10.3,https://192.168.10.4,https://192.168.10.5"  # 叢集https, 逗号分隔

WORK_DIR=/opt/etcd

cat <<EOF >$WORK_DIR/cfg/etcd

#[Member]
ETCD_NAME="${ETCD_NAME}"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_LISTEN_CLIENT_URLS="https://${ETCD_IP}:2379"


#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://${ETCD_IP}:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://${ETCD_IP}:2379"
ETCD_INITIAL_CLUSTER="etcd01=https://${ETCD_IP}:2380,${ETCD_CLUSTER}"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF


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

[Service]
Type=notify
EnvironmentFile=${WORK_DIR}/cfg/etcd
ExecStart=${WORK_DIR}/bin/etcd \
--name=\${ETCD_NAME} \
--data-dir=\${ETCD_DATA_DIR} \
--listen-peer-urls=\${ETCD_LISTEN_PEER_URLS} \
--listen-client-urls=\${ETCD_LISTEN_CLIENT_URLS} \
--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=${WORK_DIR}/ssl/server.pem \
--key-file=${WORK_DIR}/ssl/server-key.pem \
--peer-cert-file=${WORK_DIR}/ssl/server.pem \
--peer-key-file=${WORK_DIR}/ssl/server-key.pem \
--trusted-ca-file=${WORK_DIR}/ssl/ca.pem \
--peer-trusted-ca-file=${WORK_DIR}/ssl/ca.pem
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enabled etcd
systemctl restart etcd
           

• 修改ETCD_NAME和ETCD_IP到其它節點下并執行

  如節點2就ETCD_NAME改為etcd_02(随便寫)

  ip改為本機ip

• 使用etcdctl檢視叢集狀态

  /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://172.19.0.3:2379,https://172.19.0.11:2379,https://172.19.0.9:2379,https://172.19.0.8:2379,https://172.19.0.4:2379" cluster-health

  輸出如下

[[email protected] ~]# ./check_etcd.sh 
member 4e3c161948c74816 is healthy: got healthy result from https://192.168.0.1:2379
member 616f419c807a4e9b is healthy: got healthy result from https://192.168.0.2:2379
member 7ef23f9758b1f704 is healthy: got healthy result from https://192.168.0.3:2379
member 8c0649891fdff80b is healthy: got healthy result from https://192.168.0.4:2379
member c63fc327fd7550b9 is healthy: got healthy result from https://192.168.0.5:2379
cluster is healthy
           

ectd搭建完成