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etcd管理，證書配置，擴展，遷移恢復，帶證書擴展節點

張漢慶 / 3706人閱讀

摘要：廣告各版本離線安裝包證書配置生產環境中給配置證書相當重要，如果沒有證書，那么集群很容易被黑客利用而去挖礦什么的。細節問題非常多，一個端口，一個都不要填錯，否則就會各種錯誤包括新加節點要清數據這些小細節問題。

廣告 | kubernetes各版本離線安裝包
etcd 證書配置

生產環境中給etcd配置證書相當重要，如果沒有證書，那么k8s集群很容易被黑客利用而去挖礦什么的。做法非常簡單，比如你下了一個不安全的鏡像，通過程序掃描到etcd的ip和端口，那么黑客就可以繞開apiserver的認證直接寫數據，寫一些deployment pod等等，apiserver就會讀到這些，從而去部署黑客的程序。 我們就有一個集群這樣被利用去挖礦了,安全無小事，如果黑客惡意攻擊也可輕松刪除你的所有數據，所以證書與定期備份都很重要,即便有多個etcd節點，本文深入探討etcd管理的重要的幾個東西。

證書生成

cfssl安裝：

mkdir ~/bin
curl -s -L -o ~/bin/cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
curl -s -L -o ~/bin/cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
chmod +x ~/bin/{cfssl,cfssljson}
export PATH=$PATH:~/bin
mkdir ~/cfssl
cd ~/cfssl

寫入如下json文件，ip替換成自己的

root@dev-86-201 cfssl]# cat ca-config.json
{
    "signing": {
        "default": {
            "expiry": "43800h"
        },
        "profiles": {
            "server": {
                "expiry": "43800h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth"
                ]
            },
            "client": {
                "expiry": "43800h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "client auth"
                ]
            },
            "peer": {
                "expiry": "43800h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth",
                    "client auth"
                ]
            }
        }
    }
}
[root@dev-86-201 cfssl]# cat ca-csr.json
{
    "CN": "My own CA",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "US",
            "L": "CA",
            "O": "My Company Name",
            "ST": "San Francisco",
            "OU": "Org Unit 1",
            "OU": "Org Unit 2"
        }
    ]
}
[root@dev-86-201 cfssl]# cat server.json
{
    "CN": "etcd0",
    "hosts": [
        "127.0.0.1",
        "0.0.0.0",
        "10.1.86.201",
        "10.1.86.203",
        "10.1.86.202"
    ],
    "key": {
        "algo": "ecdsa",
        "size": 256
    },
    "names": [
        {
            "C": "US",
            "L": "CA",
            "ST": "San Francisco"
        }
    ]
}

[root@dev-86-201 cfssl]# cat member1.json  # 填本機IP
{
    "CN": "etcd0",
    "hosts": [
        "10.1.86.201"
    ],
    "key": {
        "algo": "ecdsa",
        "size": 256
    },
    "names": [
        {
            "C": "US",
            "L": "CA",
            "ST": "San Francisco"
        }
    ]
}

[root@dev-86-201 cfssl]# cat client.json
{
    "CN": "client",
    "hosts": [
       ""
    ],
    "key": {
        "algo": "ecdsa",
        "size": 256
    },
    "names": [
        {
            "C": "US",
            "L": "CA",
            "ST": "San Francisco"
        }
    ]
}

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=server server.json | cfssljson -bare server
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=peer member1.json | cfssljson -bare member1
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=client client.json | cfssljson -bare client
啟動etcd

cfssl目錄拷貝到/etc/kubernetes/pki/cfssl 目錄

[root@dev-86-201 manifests]# cat etcd.yaml
apiVersion: v1
kind: Pod
metadata:
  annotations:
    scheduler.alpha.kubernetes.io/critical-pod: ""
  creationTimestamp: null
  labels:
    component: etcd
    tier: control-plane
  name: etcd
  namespace: kube-system
spec:
  containers:
  - command:
    - etcd
    - --advertise-client-urls=https://10.1.86.201:2379
    - --cert-file=/etc/kubernetes/pki/etcd/server.pem
    - --client-cert-auth=true
    - --data-dir=/var/lib/etcd
    - --initial-advertise-peer-urls=https://10.1.86.201:2380
    - --initial-cluster=etcd0=https://10.1.86.201:2380
    - --key-file=/etc/kubernetes/pki/etcd/server-key.pem
    - --listen-client-urls=https://10.1.86.201:2379
    - --listen-peer-urls=https://10.1.86.201:2380
    - --name=etcd0
    - --peer-cert-file=/etc/kubernetes/pki/etcd/member1.pem
    - --peer-client-cert-auth=true
    - --peer-key-file=/etc/kubernetes/pki/etcd/member1-key.pem
    - --peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem
    - --snapshot-count=10000
    - --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem
    image: k8s.gcr.io/etcd-amd64:3.2.18
    imagePullPolicy: IfNotPresent
   #livenessProbe:
   #  exec:
   #    command:
   #    - /bin/sh
   #    - -ec
   #    - ETCDCTL_API=3 etcdctl --endpoints=https://[10.1.86.201]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.pem
   #      --cert=/etc/kubernetes/pki/etcd/client.pem --key=/etc/kubernetes/pki/etcd/client-key.pem
   #      get foo
   #  failureThreshold: 8
   #  initialDelaySeconds: 15
   #  timeoutSeconds: 15
    name: etcd
    resources: {}
    volumeMounts:
    - mountPath: /var/lib/etcd
      name: etcd-data
    - mountPath: /etc/kubernetes/pki/etcd
      name: etcd-certs
  hostNetwork: true
  priorityClassName: system-cluster-critical
  volumes:
  - hostPath:
      path: /var/lib/etcd
      type: DirectoryOrCreate
    name: etcd-data
  - hostPath:
      path: /etc/kubernetes/pki/cfssl
      type: DirectoryOrCreate
    name: etcd-certs
status: {}

進入etcd容器執行：

alias etcdv3="ETCDCTL_API=3 etcdctl --endpoints=https://[10.1.86.201]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.pem --cert=/etc/kubernetes/pki/etcd/client.pem --key=/etc/kubernetes/pki/etcd/client-key.pem"
etcdv3 member add etcd1 --peer-urls="https://10.1.86.202:2380"
增加節點

拷貝etcd0(10.1.86.201)節點上的證書到etcd1(10.1.86.202)節點上
修改member1.json:

{
    "CN": "etcd1",
    "hosts": [
        "10.1.86.202"
    ],
    "key": {
        "algo": "ecdsa",
        "size": 256
    },
    "names": [
        {
            "C": "US",
            "L": "CA",
            "ST": "San Francisco"
        }
    ]
}

重新生成在etcd1上生成member1證書：

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=peer member1.json | cfssljson -bare member1

啟動etcd1：

[root@dev-86-202 manifests]# cat etcd.yaml
apiVersion: v1
kind: Pod
metadata:
  annotations:
    scheduler.alpha.kubernetes.io/critical-pod: ""
  creationTimestamp: null
  labels:
    component: etcd
    tier: control-plane
  name: etcd
  namespace: kube-system
spec:
  containers:
  - command:
    - etcd
    - --advertise-client-urls=https://10.1.86.202:2379
    - --cert-file=/etc/kubernetes/pki/etcd/server.pem
    - --data-dir=/var/lib/etcd
    - --initial-advertise-peer-urls=https://10.1.86.202:2380
    - --initial-cluster=etcd0=https://10.1.86.201:2380,etcd1=https://10.1.86.202:2380
    - --key-file=/etc/kubernetes/pki/etcd/server-key.pem
    - --listen-client-urls=https://10.1.86.202:2379
    - --listen-peer-urls=https://10.1.86.202:2380
    - --name=etcd1
    - --peer-cert-file=/etc/kubernetes/pki/etcd/member1.pem
    - --peer-client-cert-auth=true
    - --peer-key-file=/etc/kubernetes/pki/etcd/member1-key.pem
    - --peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem
    - --snapshot-count=10000
    - --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem
    - --initial-cluster-state=existing  # 千萬別加雙引號，被坑死
    image: k8s.gcr.io/etcd-amd64:3.2.18
    imagePullPolicy: IfNotPresent
  # livenessProbe:
  #   exec:
  #     command:
  #     - /bin/sh
  #     - -ec
  #     - ETCDCTL_API=3 etcdctl --endpoints=https://[10.1.86.202]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt
  #       --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key
  #       get foo
  #   failureThreshold: 8
  #   initialDelaySeconds: 15
  #   timeoutSeconds: 15
    name: etcd
    resources: {}
    volumeMounts:
    - mountPath: /var/lib/etcd
      name: etcd-data
    - mountPath: /etc/kubernetes/pki/etcd
      name: etcd-certs
  hostNetwork: true
  priorityClassName: system-cluster-critical
  volumes:
  - hostPath:
      path: /var/lib/etcd
      type: DirectoryOrCreate
    name: etcd-data
  - hostPath:
      path: /etc/kubernetes/pki/cfssl
      type: DirectoryOrCreate
    name: etcd-certs
status: {}

或者用docker起先測試一下：

docker run --net=host -v /etc/kubernetes/pki/cfssl:/etc/kubernetes/pki/etcd k8s.gcr.io/etcd-amd64:3.2.18 etcd 
--advertise-client-urls=https://10.1.86.202:2379 
--cert-file=/etc/kubernetes/pki/etcd/server.pem 
--data-dir=/var/lib/etcd 
--initial-advertise-peer-urls=https://10.1.86.202:2380 
--initial-cluster=etcd0=https://10.1.86.201:2380,etcd1=https://10.1.86.202:2380 
--key-file=/etc/kubernetes/pki/etcd/server-key.pem  
--listen-client-urls=https://10.1.86.202:2379 
--listen-peer-urls=https://10.1.86.202:2380 --name=etcd1 
--peer-cert-file=/etc/kubernetes/pki/etcd/member1.pem 
--peer-key-file=/etc/kubernetes/pki/etcd/member1-key.pem 
--peer-client-cert-auth=true 
--peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem --snapshot-count=10000 
--trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem --initial-cluster-state="existing"

etcd0上檢查集群健康:

# etcdctl --endpoints=https://[10.1.86.201]:2379 --ca-file=/etc/kubernetes/pki/etcd/ca.pem --cert-file=/etc/kubernetes/pki/etcd/client.pem --key-file=/etc/kubernetes/pki/etcd/client-key.pem cluster-heal
th
member 5856099674401300 is healthy: got healthy result from https://10.1.86.201:2379
member df99f445ac908d15 is healthy: got healthy result from https://10.1.86.202:2379
cluster is healthy

etcd2增加同理，略

apiserver etcd證書 配置：

- --etcd-cafile=/etc/kubernetes/pki/cfssl/ca.pem
- --etcd-certfile=/etc/kubernetes/pki/cfssl/client.pem
- --etcd-keyfile=/etc/kubernetes/pki/cfssl/client-key.pem
快照與擴展節點 etcd快照恢復

說明：
有證書集群以下所有命令需帶上如下證書參數，否則訪問不了

--cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/peer.crt --key=/etc/kubernetes/pki/etcd/peer.key

endpoints默認為127.0.0.1:2379，若需指定遠程etcd地址，可通過如下參數指定

--endpoints 172.16.154.81:2379

1、獲取數據快照

ETCDCTL_API=3 etcdctl snapshot save snapshot.db

2、從快照恢復數據

ETCDCTL_API=3 etcdctl snapshot restore snapshot.db --data-dir=/var/lib/etcd/

3、啟動新etcd節點，指定--data-dir=/var/lib/etcd/

etcd節點擴展
節點名 IP 備注
infra0 172.16.154.81 初始節點，k8s的master節點，kubeadm所部署的單節點etcd所在機器
infra1 172.16.154.82 待添加節點，k8s的node節點
infra2 172.16.154.83 待添加節點，k8s的node節點

1、從初始etcd節點獲取數據快照

ETCDCTL_API=3 etcdctl --cacert=/etc/kubernetes/pki/etcd/ca.crt --cert=/etc/kubernetes/pki/etcd/peer.crt --key=/etc/kubernetes/pki/etcd/peer.key --endpoints=https://127.0.0.1:2379 snapshot save snapshot.db

2、將快照文件snapshot.db復制到infra1節點，并執行數據恢復命令

數據恢復命令

ETCDCTL_API=3 etcdctl snapshot restore snapshot.db --data-dir=/var/lib/etcd/

注：執行上述命令需要機器上有etcdctl

上述命令執行成功會將快照中的數據存放到/var/lib/etcd目錄中

3、在infra1節點啟動etcd
將如下yaml放入/etc/kubernetes/manifests

apiVersion: v1
kind: Pod
metadata:
  labels:
    component: etcd
    tier: control-plane
  name: etcd-172.16.154.82
  namespace: kube-system
spec:
  containers:
  - command:
    - etcd
    - --name=infra0
    - --initial-advertise-peer-urls=http://172.16.154.82:2380
    - --listen-peer-urls=http://172.16.154.82:2380
    - --listen-client-urls=http://172.16.154.82:2379,http://127.0.0.1:2379
    - --advertise-client-urls=http://172.16.154.82:2379
    - --data-dir=/var/lib/etcd
    - --initial-cluster-token=etcd-cluster-1
    - --initial-cluster=infra0=http://172.16.154.82:2380
    - --initial-cluster-state=new
    image: hub.xfyun.cn/k8s/etcd-amd64:3.1.12
    livenessProbe:
      httpGet:
        host: 127.0.0.1
        path: /health
        port: 2379
        scheme: HTTP
      failureThreshold: 8
      initialDelaySeconds: 15
      timeoutSeconds: 15
    name: etcd
    volumeMounts:
    - name: etcd-data
      mountPath: /var/lib/etcd
  hostNetwork: true
  volumes:
  - hostPath:
      path: /var/lib/etcd
      type: DirectoryOrCreate
    name: etcd-data

4、infra2節點加入etcd集群中
在infra1中etcd容器中執行

ETCDCTL_API=3 etcdctl member add infra2 --peer-urls="http://172.16.154.83:2380"

將如下yaml放入/etc/kubernetes/manifests，由kubelet啟動etcd容器

apiVersion: v1
kind: Pod
metadata:
  labels:
    component: etcd
    tier: control-plane
  name: etcd-172.16.154.83
  namespace: kube-system
spec:
  containers:
  - command:
    - etcd
    - --name=infra1
    - --initial-advertise-peer-urls=http://172.16.154.83:2380
    - --listen-peer-urls=http://172.16.154.83:2380
    - --listen-client-urls=http://172.16.154.83:2379,http://127.0.0.1:2379
    - --advertise-client-urls=http://172.16.154.83:2379
    - --data-dir=/var/lib/etcd
    - --initial-cluster-token=etcd-cluster-1
    - --initial-cluster=infra1=http://172.16.154.82:2380,infra2=http://172.16.154.83:2380
    - --initial-cluster-state=existing
    image: hub.xfyun.cn/k8s/etcd-amd64:3.1.12
    livenessProbe:
      httpGet:
        host: 127.0.0.1
        path: /health
        port: 2379
        scheme: HTTP
      failureThreshold: 8
      initialDelaySeconds: 15
      timeoutSeconds: 15
    name: etcd
    volumeMounts:
    - name: etcd-data
      mountPath: /var/lib/etcd
  hostNetwork: true
  volumes:
  - hostPath:
      path: /home/etcd
      type: DirectoryOrCreate
    name: etcd-data

infra0節點加入集群重復上述操作；注意在加入集群之前，將之前/var/lib/etcd/的數據刪除。

實踐 - 給kubeadm單etcd增加etcd節點 環境介紹

10.1.86.201 單點etcd etcd0

10.1.86.202 擴展節點 etcd1

10.1.86.203 擴展節點 etcd2

安裝k8s

先在etcd0節點上啟動k8s，當然是使用sealyun的安裝包 三步安裝不多說

修改證書

按照上述生成證書的方法生成證書并拷貝到對應目錄下

cp -r cfssl/ /etc/kubernetes/pki/
修改etcd配置： 
cd /etc/kubernetes/manifests/
mv etcd.yaml ..   # 不要直接修改，防止k8s去讀swap文件
vim ../etcd.yaml

vim里面全局替換，把127.0.0.1替換成ip地址

:%s/127.0.0.1/10.1.86.201/g

注釋掉健康檢測探針，否則加節點時健康檢測會導致etcd0跪掉

#   livenessProbe:
#     exec:
#       command:
#       - /bin/sh
#       - -ec
#       - ETCDCTL_API=3 etcdctl --endpoints=https://[10.1.86.201]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt
#         --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key
#         get foo
#     failureThreshold: 8
#     initialDelaySeconds: 15
#     timeoutSeconds: 15

修改證書掛載配置目錄

  volumes:
  - hostPath:
      path: /etc/kubernetes/pki/cfssl
      type: DirectoryOrCreate
    name: etcd-certs

修改證書配置,全改完長這樣：

[root@dev-86-201 manifests]# cat ../etcd.yaml
apiVersion: v1
kind: Pod
metadata:
  annotations:
    scheduler.alpha.kubernetes.io/critical-pod: ""
  creationTimestamp: null
  labels:
    component: etcd
    tier: control-plane
  name: etcd
  namespace: kube-system
spec:
  containers:
  - command:
    - etcd
    - --advertise-client-urls=https://10.1.86.201:2379
    - --cert-file=/etc/kubernetes/pki/etcd/server.pem
    - --client-cert-auth=true
    - --data-dir=/var/lib/etcd
    - --initial-advertise-peer-urls=https://10.1.86.201:2380
    - --initial-cluster=etcd0=https://10.1.86.201:2380
    - --key-file=/etc/kubernetes/pki/etcd/server-key.pem
    - --listen-client-urls=https://10.1.86.201:2379
    - --listen-peer-urls=https://10.1.86.201:2380
    - --name=dev-86-201
    - --peer-cert-file=/etc/kubernetes/pki/etcd/member1.pem
    - --peer-client-cert-auth=true
    - --peer-key-file=/etc/kubernetes/pki/etcd/member1-key.pem
    - --peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem
    - --snapshot-count=10000
    - --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem
    image: k8s.gcr.io/etcd-amd64:3.2.18
    imagePullPolicy: IfNotPresent
#   livenessProbe:
#     exec:
#       command:
#       - /bin/sh
#       - -ec
#       - ETCDCTL_API=3 etcdctl --endpoints=https://[10.1.86.201]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt
#         --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key
#         get foo
#     failureThreshold: 8
#     initialDelaySeconds: 15
#     timeoutSeconds: 15
    name: etcd
    resources: {}
    volumeMounts:
    - mountPath: /var/lib/etcd
      name: etcd-data
    - mountPath: /etc/kubernetes/pki/etcd
      name: etcd-certs
  hostNetwork: true
  priorityClassName: system-cluster-critical
  volumes:
  - hostPath:
      path: /etc/kubernetes/pki/cfssl
      type: DirectoryOrCreate
    name: etcd-certs
  - hostPath:
      path: /var/lib/etcd
      type: DirectoryOrCreate
    name: etcd-data
status: {}

啟動etcd, 把yaml文件移回來：

mv ../etcd.yaml .

修改APIserver參數：

mv kube-apiserver.yaml ..
vim ../kube-apiserver.yaml
    - --etcd-cafile=/etc/kubernetes/pki/cfssl/ca.pem
    - --etcd-certfile=/etc/kubernetes/pki/cfssl/client.pem
    - --etcd-keyfile=/etc/kubernetes/pki/cfssl/client-key.pem
    - --etcd-servers=https://10.1.86.201:2379

啟動apiserver:

mv ../kube-apiserver.yaml .

驗證：

kubectl get pod -n kube-system  # 能正常返回pod標志成功

到此etcd0上的操作完成

增加新節點, 進入到etcd容器內:

[root@dev-86-201 ~]# docker exec -it a7001397e1e5 sh
/ # alias etcdv3="ETCDCTL_API=3 etcdctl --endpoints=https://[10.1.86.201]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.pem --cert=/etc/kubernetes/pki/etcd/client.pem --key=/etc/kubernetes/pki/etcd/client-key
.pem"
/ # etcdv3 member update a874c87fd42044f  --peer-urls="https://10.1.86.201:2380" # 更新peer url 很重要
/ # etcdv3 member add etcd1 --peer-urls="https://10.1.86.202:2380"
Member 20c2a99381581958 added to cluster c9be114fc2da2776

ETCD_NAME="etcd1"
ETCD_INITIAL_CLUSTER="dev-86-201=https://127.0.0.1:2380,etcd1=https://10.1.86.202:2380"
ETCD_INITIAL_CLUSTER_STATE="existing"

/ # alias etcdv2="ETCDCTL_API=2 etcdctl --endpoints=https://[10.1.86.201]:2379 --ca-file=/etc/kubernetes/pki/etcd/ca.pem --cert-file=/etc/kubernetes/pki/etcd/client.pem --key-file=/etc/kubernetes/pki/etcd/client-key.pem"
/ # etcdv2 cluster-health
etcd1上增加一個etcd節點

同樣先在etcd1（10.1.86.202) 上安裝k8s，同etcd0上的安裝

把etcd0的cfssl證書目錄拷貝到etcd1上備用

scp -r root@10.1.86.201:/etc/kubernetes/pki/cfssl /etc/kubernetes/pki

修改member1.json:

[root@dev-86-202 cfssl]# cat member1.json
{
    "CN": "etcd1",      # CN 改一下
    "hosts": [
        "10.1.86.202"   # 主要改成自身ip
    ],
    "key": {
        "algo": "ecdsa",
        "size": 256
    },
    "names": [
        {
            "C": "US",
            "L": "CA",
            "ST": "San Francisco"
        }
    ]
}

重新生成member1證書：

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=peer member1.json | cfssljson -bare member1

驗證證書：

openssl x509 -in member1.pem -text -noout

修改etcd1的etcd配置：

mv etcd.yaml ..
rm /var/lib/etcd/ -rf # 因為這是個擴展節點，需要同步etcd0的數據，所以把它自己數據刪掉
vim ../etcd.yaml

修改后yaml文件u

apiVersion: v1
kind: Pod
metadata:
  annotations:
    scheduler.alpha.kubernetes.io/critical-pod: ""
  creationTimestamp: null
  labels:
    component: etcd
    tier: control-plane
  name: etcd
  namespace: kube-system
spec:
  containers:
  - command:
    - etcd
    - --advertise-client-urls=https://10.1.86.202:2379
    - --cert-file=/etc/kubernetes/pki/etcd/server.pem
    - --data-dir=/var/lib/etcd
    - --initial-advertise-peer-urls=https://10.1.86.202:2380
    - --initial-cluster=etcd0=https://10.1.86.201:2380,etcd1=https://10.1.86.202:2380
    - --key-file=/etc/kubernetes/pki/etcd/server-key.pem
    - --listen-client-urls=https://10.1.86.202:2379
    - --listen-peer-urls=https://10.1.86.202:2380
    - --name=etcd1
    - --peer-cert-file=/etc/kubernetes/pki/etcd/member1.pem
    - --peer-client-cert-auth=true
    - --peer-key-file=/etc/kubernetes/pki/etcd/member1-key.pem
    - --peer-trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem
    - --snapshot-count=10000
    - --trusted-ca-file=/etc/kubernetes/pki/etcd/ca.pem
    - --initial-cluster-state=existing  # 千萬別加雙引號，被坑死
    image: k8s.gcr.io/etcd-amd64:3.2.18
    imagePullPolicy: IfNotPresent
  # livenessProbe:
  #   exec:
  #     command:
  #     - /bin/sh
  #     - -ec
  #     - ETCDCTL_API=3 etcdctl --endpoints=https://[10.1.86.202]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt
  #       --cert=/etc/kubernetes/pki/etcd/healthcheck-client.crt --key=/etc/kubernetes/pki/etcd/healthcheck-client.key
  #       get foo
  #   failureThreshold: 8
  #   initialDelaySeconds: 15
  #   timeoutSeconds: 15
    name: etcd
    resources: {}
    volumeMounts:
    - mountPath: /var/lib/etcd
      name: etcd-data
    - mountPath: /etc/kubernetes/pki/etcd
      name: etcd-certs
  hostNetwork: true
  priorityClassName: system-cluster-critical
  volumes:
  - hostPath:
      path: /var/lib/etcd
      type: DirectoryOrCreate
    name: etcd-data
  - hostPath:
      path: /etc/kubernetes/pki/cfssl
      type: DirectoryOrCreate
    name: etcd-certs
status: {}

在容器內查看集群已經健康運行了：

/ # alias etcdv2="ETCDCTL_API=2 etcdctl --endpoints=https://[10.1.86.201]:2379 --ca-file=/etc/kubernetes/pki/etcd/ca.pem --cert-file=/etc/kubernetes/pki/etcd/client.pem --key-file=/etc/kubernetes/pki/etcd/client-key.pem"
/ # etcdv2 cluster-health
member a874c87fd42044f is healthy: got healthy result from https://10.1.86.201:2379
member bbbbf223ec75e000 is healthy: got healthy result from https://10.1.86.202:2379
cluster is healthy

然后就可以把apiserver啟動參數再加一個etcd1:

    - --etcd-servers=https://10.1.86.201:2379
    - --etcd-servers=https://10.1.86.202:2379

第三個節點同第二個，不再贅述。

細節問題非常多，一個端口，一個IP都不要填錯，否則就會各種錯誤, 包括新加節點要清etcd數據這些小細節問題。
大功告成！

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