• CentOS 7 ETCD集群配置大全


    前言

    Etcd 是 CoreOS 基于 Raft 开发的分布式 key-value 存储,可用于服务发现、共享配置以及一致性保障(如数据库选主、分布式锁等)

    本次环境,是用于k8s集群,由于在二进制部署 k8s 中,由于 Etcd 集群导致各种各样的问题,特意抽出时间来研究 Etcd 集群。

    Etcd 集群配置分为三种:

    1. 静态发现
    2. Etcd 动态发现
    3. DNS 动态发现 通过DNS的SRV解析动态发现集群

    本次主要基于 静态发现 和 DNS动态发现 两种,并结合自签的TLS证书来创建集群。

    环境准备

    此环境实际用于 k8s 中的ETCD集群使用,用于本次文档

    主机名 角色 IP 系统版本 内核版本
    node01.k8s.com node01 192.168.1.91 CentOS 7.7 5.1.4-1.el7.elrepo.x86_64
    node02.k8s.com node02 192.168.1.92 CentOS 7.7 5.1.4-1.el7.elrepo.x86_64
    node03.k8s.com node03 192.168.1.93 CentOS 7.7 5.1.4-1.el7.elrepo.x86_64

    安装

    在三台机器上均执行

    [root@node01 ~]# yum install etcd -y
    [root@node01 ~]# rpm -qa etcd
    etcd-3.3.11-2.el7.centos.x86_64
    

    创建Etcd所需目录,在三台机器上均执行

    mkdir /data/k8s/etcd/{data,wal} -p
    mkdir -p /etc/kubernetes/cert
    chown -R etcd.etcd /data/k8s/etcd
    

    静态集群

    配置

    node01 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="http://192.168.1.91:2380"
    ETCD_LISTEN_CLIENT_URLS="http://192.168.1.91:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd1"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.1.91:2380"
    ETCD_ADVERTISE_CLIENT_URLS="http://192.168.1.91:2379"
    
    ETCD_INITIAL_CLUSTER="etcd1=http://192.168.1.91:2380,etcd2=http://192.168.1.92:2380,etcd3=http://192.168.1.93:2380"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    

    node02 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="http://192.168.1.92:2380"
    ETCD_LISTEN_CLIENT_URLS="http://192.168.1.92:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd2"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.1.92:2380"
    ETCD_ADVERTISE_CLIENT_URLS="http://192.168.1.92:2379"
    
    ETCD_INITIAL_CLUSTER="etcd1=http://192.168.1.91:2380,etcd2=http://192.168.1.92:2380,etcd3=http://192.168.1.93:2380"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    

    node03 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="http://192.168.1.93:2380"
    ETCD_LISTEN_CLIENT_URLS="http://192.168.1.93:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd3"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="http://192.168.1.93:2380"
    ETCD_ADVERTISE_CLIENT_URLS="http://192.168.1.93:2379"
    
    ETCD_INITIAL_CLUSTER="etcd1=http://192.168.1.91:2380,etcd2=http://192.168.1.92:2380,etcd3=http://192.168.1.93:2380"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    

    启动测试

    [root@node01 etcd]# systemctl start etcd
    [root@node01 etcd]# systemctl status etcd
    ● etcd.service - Etcd Server
       Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
       Active: active (running) since Thu 2019-11-07 09:28:54 CST; 5s ago
     Main PID: 1546 (etcd)
        Tasks: 8
       Memory: 41.3M
       CGroup: /system.slice/etcd.service
               └─1546 /usr/bin/etcd --name=etcd1 --data-dir=/data/k8s/etcd/data --listen-client-urls=http://192.168.1.91:2379
    
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: 3b8b38de05e2c497 [term: 1] received a MsgVote message with higher term from 9c64fba479c5e94 [term: 2]
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: 3b8b38de05e2c497 became follower at term 2
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: 3b8b38de05e2c497 [logterm: 1, index: 3, vote: 0] cast MsgVote for 9c64fba479c5e94 [logterm: 1, index: 3] at term 2
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: raft.node: 3b8b38de05e2c497 elected leader 9c64fba479c5e94 at term 2
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: published {Name:etcd1 ClientURLs:[http://192.168.1.91:2379]} to cluster 19456f0bfd57284e
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: ready to serve client requests
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: serving insecure client requests on 192.168.1.91:2379, this is strongly discouraged!
    Nov 07 09:28:54 node01.k8s.com systemd[1]: Started Etcd Server.
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: set the initial cluster version to 3.3
    Nov 07 09:28:54 node01.k8s.com etcd[1546]: enabled capabilities for version 3.3
    
    

    查看 /var/log/message 日志中,会有日下体现:

    Nov  7 09:28:53 node02 etcd: added member 9c64fba479c5e94 [http://192.168.1.92:2380] to cluster 19456f0bfd57284e
    Nov  7 09:28:53 node02 etcd: added member 3b8b38de05e2c497 [http://192.168.1.91:2380] to cluster 19456f0bfd57284e
    Nov  7 09:28:53 node02 etcd: added member 76ea8679db7365b3 [http://192.168.1.93:2380] to cluster 19456f0bfd57284e
    

    查看集群状态

    [root@node01 etcd]# ETCDCTL_API=3 etcdctl --endpoints=http://192.168.1.91:2379,http://192.168.1.92:2379,http://192.168.1.93:2379 endpoint health
    http://192.168.1.92:2379 is healthy: successfully committed proposal: took = 1.103545ms
    http://192.168.1.93:2379 is healthy: successfully committed proposal: took = 2.122478ms
    http://192.168.1.91:2379 is healthy: successfully committed proposal: took = 2.690215ms
    
    [root@node01 etcd]# etcdctl --endpoints=http://192.168.1.91:2379,http://192.168.1.92:2379,http://192.168.1.93:2379 cluster-health
    member 9c64fba479c5e94 is healthy: got healthy result from http://192.168.1.92:2379
    member 3b8b38de05e2c497 is healthy: got healthy result from http://192.168.1.91:2379
    member 76ea8679db7365b3 is healthy: got healthy result from http://192.168.1.93:2379
    cluster is healthy
    

    生成TLS证书

    使用自签证书

    CA(Certificate Authority)是自签名的根证书,用来签名后续创建的其他证书。本文章使用CloudFlare的PKI工具cfssl创建所有证书。

    etcd证书创建

    整个证书的创建过程均在 node01 上操作;

    安装cfssl工具集

    mkdir -p /opt/k8s/cert && cd /opt/k8s
    wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
    mv cfssl_linux-amd64 /opt/k8s/bin/cfssl
    wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
    mv cfssljson_linux-amd64 /opt/k8s/bin/cfssljson
    wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
    mv cfssl-certinfo_linux-amd64 /opt/k8s/bin/cfssl-certinfo
    chmod +x /opt/k8s/bin/*
    echo 'export PATH=/opt/k8s/bin:$PATH' >> ~/.bash_profile
    source ~/.bash_profile
    

    生成证书

    创建根证书 (CA)

    CA证书是集群所有节点共享的,只需要创建一个CA证书,后续创建的所有证书都是由它签名

    创建配置文件

    CA配置文件用于配置根证书的使用场景(profile)和具体参数

    (usage、过期时间、服务端认证、客户端认证、加密等)

    cd /opt/k8s/work
    cat > ca-config.json <<EOF
    {
      "signing": {
        "default": {
          "expiry": "87600h"
        },
        "profiles": {
          "kubernetes": {
            "usages": [
                "signing",
                "key encipherment",
                "server auth",
                "client auth"
            ],
            "expiry": "87600h"
          }
        }
      }
    }
    EOF
    
    
    ######################
    signing 表示该证书可用于签名其它证书,生成的ca.pem证书找中CA=TRUE
    server auth 表示client可以用该证书对server提供的证书进行验证
    client auth 表示server可以用该证书对client提供的证书进行验证
    

    创建证书签名请求文件

    cd /opt/k8s/work
    cat > ca-csr.json <<EOF
    {
      "CN": "kubernetes",
      "key": {
        "algo": "rsa",
        "size": 2048
      },
      "names": [
        {
          "C": "CN",
          "ST": "BeiJing",
          "L": "BeiJing",
          "O": "k8s",
          "OU": "System"
        }
      ]
    }
    EOF
    
    
    
    #######################
    CN CommonName,kube-apiserver从证书中提取该字段作为请求的用户名(User Name),浏览器使用该字段验证网站是否合法
    O Organization,kube-apiserver 从证书中提取该字段作为请求用户和所属组(Group)
    kube-apiserver将提取的User、Group作为RBAC授权的用户和标识
    

    生成CA证书和私钥

    cd /opt/k8s/work
    cfssl gencert -initca ca-csr.json | cfssljson -bare ca
    ls ca*
    

    创建etcd证书和私钥

    cd /opt/k8s/work
    cat > etcd-csr.json <<EOF
    {
      "CN": "etcd",
      "hosts": [
        "127.0.0.1",
        "192.168.1.91",
        "192.168.1.92",
        "192.168.1.93",
        "k8s.com",
        "etcd1.k8s.com",
        "etcd2.k8s.com",
        "etcd3.k8s.com"
      ],
      "key": {
        "algo": "rsa",
        "size": 2048
      },
      "names": [
        {
          "C": "CN",
          "ST": "BeiJing",
          "L": "BeiJing",
          "O": "k8s",
          "OU": "4Paradigm"
        }
      ]
    }
    EOF
    
    #host字段指定授权使用该证书的etcd节点IP或域名列表,需要将etcd集群的3个节点都添加其中
    

    生成证书和私钥

    cd /opt/k8s/work
    
    cfssl gencert -ca=/opt/k8s/work/ca.pem 
        -ca-key=/opt/k8s/work/ca-key.pem 
        -config=/opt/k8s/work/ca-config.json 
        -profile=kubernetes etcd-csr.json | cfssljson -bare etcd
        
    ls etcd*pem -l
    -rw------- 1 root root 1675 Nov  7 09:52 etcd-key.pem
    -rw-r--r-- 1 root root 1444 Nov  7 09:52 etcd.pem
    

    etcd 使用的TLS证书创建完成

    分发证书到各节点上

    要做所有节点上创建对应的目录

    mkdir /data/k8s/etcd/{data,wal} -p
    mkdir -p /etc/kubernetes/cert
    chown -R etcd.etcd /data/k8s/etcd
    

    分发证书

    cd /opt/k8s/work
    scp ca*.pem ca-config.json 192.168.1.91:/etc/kubernetes/cert
    scp ca*.pem ca-config.json 192.168.1.92:/etc/kubernetes/cert 
    scp ca*.pem ca-config.json 192.168.1.93:/etc/kubernetes/cert
    scp etcd*pem 192.168.1.91:/etc/etcd/cert/
    scp etcd*pem 192.168.1.92:/etc/etcd/cert/
    scp etcd*pem 192.168.1.93:/etc/etcd/cert/
    

    在所有节点上执行:

    chown -R etcd.etcd /etc/etcd/cert
    

    静态TLS集群

    etcd 配置

    node01 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="https://192.168.1.91:2380"
    ETCD_LISTEN_CLIENT_URLS="https://192.168.1.91:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd1"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.91:2380"
    ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.91:2379"
    ETCD_INITIAL_CLUSTER="etcd1=https://192.168.1.91:2380,etcd2=https://192.168.1.92:2380,etcd3=https://192.168.1.93:2380"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    
    ETCD_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_CLIENT_CERT_AUTH="true"
    ETCD_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_AUTO_TLS="true"
    ETCD_PEER_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_PEER_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_PEER_CLIENT_CERT_AUTH="true"
    ETCD_PEER_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_PEER_AUTO_TLS="true"
    

    node02 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="https://192.168.1.92:2380"
    ETCD_LISTEN_CLIENT_URLS="https://192.168.1.92:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd2"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.92:2380"
    ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.92:2379"
    ETCD_INITIAL_CLUSTER="etcd1=https://192.168.1.91:2380,etcd2=https://192.168.1.92:2380,etcd3=https://192.168.1.93:2380"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    
    ETCD_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_CLIENT_CERT_AUTH="true"
    ETCD_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_AUTO_TLS="true"
    ETCD_PEER_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_PEER_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_PEER_CLIENT_CERT_AUTH="true"
    ETCD_PEER_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_PEER_AUTO_TLS="true"
    

    node03 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="https://192.168.1.93:2380"
    ETCD_LISTEN_CLIENT_URLS="https://192.168.1.93:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd3"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.1.93:2380"
    ETCD_ADVERTISE_CLIENT_URLS="https://192.168.1.93:2379"
    ETCD_INITIAL_CLUSTER="etcd1=https://192.168.1.91:2380,etcd2=https://192.168.1.92:2380,etcd3=https://192.168.1.93:2380"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    
    ETCD_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_CLIENT_CERT_AUTH="true"
    ETCD_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_AUTO_TLS="true"
    ETCD_PEER_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_PEER_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_PEER_CLIENT_CERT_AUTH="true"
    ETCD_PEER_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_PEER_AUTO_TLS="true"
    

    启动测试

    [root@node01 work]# systemctl start etcd
    [root@node01 work]# systemctl status etcd
    ● etcd.service - Etcd Server
       Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
       Active: active (running) since Thu 2019-11-07 10:15:58 CST; 5s ago
     Main PID: 2078 (etcd)
        Tasks: 8
       Memory: 28.9M
       CGroup: /system.slice/etcd.service
               └─2078 /usr/bin/etcd --name=etcd1 --data-dir=/data/k8s/etcd/data --listen-client-urls=https://192.168.1.91:2379
    
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: 2a40d8ba966d12fe [term: 1] received a MsgVote message with higher term from af05139f75a68867 [term: 2]
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: 2a40d8ba966d12fe became follower at term 2
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: 2a40d8ba966d12fe [logterm: 1, index: 3, vote: 0] cast MsgVote for af05139f75a68867 [logterm: 1, index: 3] at term 2
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: raft.node: 2a40d8ba966d12fe elected leader af05139f75a68867 at term 2
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: published {Name:etcd1 ClientURLs:[https://192.168.1.91:2379]} to cluster f3e9c54e1aafb3c1
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: ready to serve client requests
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: serving client requests on 192.168.1.91:2379
    Nov 07 10:15:58 node01.k8s.com systemd[1]: Started Etcd Server.
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: set the initial cluster version to 3.3
    Nov 07 10:15:58 node01.k8s.com etcd[2078]: enabled capabilities for version 3.3
    

    查看 /var/log/message 日志中,会有日下体现:

    Nov  7 10:15:57 node01 etcd: added member 2a40d8ba966d12fe [https://192.168.1.91:2380] to cluster f3e9c54e1aafb3c1
    Nov  7 10:15:57 node01 etcd: added member af05139f75a68867 [https://192.168.1.92:2380] to cluster f3e9c54e1aafb3c1
    Nov  7 10:15:57 node01 etcd: added member c3bab7c20fba3f60 [https://192.168.1.93:2380] to cluster f3e9c54e1aafb3c1
    

    检查TLS集群状态

    ETCDCTL_API=3 etcdctl 
        --endpoints=https://etcd1.k8s.com:2379,https://etcd2.k8s.com:2379,https://etcd3.k8s.com:2379 
        --cacert=/etc/kubernetes/cert/ca.pem 
        --cert=/etc/etcd/cert/etcd.pem 
        --key=/etc/etcd/cert/etcd-key.pem endpoint health
    
    # 输出
    https://192.168.1.92:2379 is healthy: successfully committed proposal: took = 1.317022ms
    https://192.168.1.91:2379 is healthy: successfully committed proposal: took = 1.59958ms
    https://192.168.1.93:2379 is healthy: successfully committed proposal: took = 1.453049ms
    
    etcdctl 
    --endpoint=https://etcd1.k8s.com:2379 
    --ca-file=/etc/kubernetes/cert/ca.pem 
    --cert-file=/etc/etcd/cert/etcd.pem 
    --key-file=/etc/etcd/cert/etcd-key.pem cluster-health
    
    # 输出
    member 40a8f19a5db99534 is healthy: got healthy result from https://etcd2.k8s.com:2379
    member 9888555207dbf0e0 is healthy: got healthy result from https://etcd3.k8s.com:2379
    member a0d541999e9eb3b3 is healthy: got healthy result from https://etcd1.k8s.com:2379
    cluster is healthy
    

    ETCD 动态集群基于DNS的SRV解析自动发现

    需要局域网内部有DNS服务器

    添加SRV解析

    目前常用的内部DNS服务有两种,binddnsmasq

    在下面都会列出具体的配置,但只需要配置其中之一即可;

    方法一: 使用bind配置SRV解析

    如果内部没有bind服务,可以参考部署文档文章: https://www.cnblogs.com/winstom/p/11806962.html

    使用域名为 : k8s.com,在bind的zone文件中添加如下解析:

    etcd1   IN      A       192.168.1.91
    etcd2   IN      A       192.168.1.92
    etcd3   IN      A       192.168.1.93
    _etcd-server._tcp.k8s.com.  IN      SRV     10    10       2380     etcd1
    _etcd-server._tcp.k8s.com.  IN      SRV     10    10       2380     etcd2
    _etcd-server._tcp.k8s.com.  IN      SRV     10    10       2380     etcd3
    _etcd-client._tcp.k8s.com.  IN      SRV     10    10       2379     etcd1
    _etcd-client._tcp.k8s.com.  IN      SRV     10    10       2379     etcd2
    _etcd-client._tcp.k8s.com.  IN      SRV     10    10       2379     etcd3
    

    修改之后重新加载配置文件:

    [root@jenkins named]# named-checkzone k8s.com k8s.com.zone 
    zone k8s.com/IN: loaded serial 0
    OK
    [root@jenkins named]# rndc reload
    server reload successful
    

    方法二: 使用dnsmasq配置SRV解析

    如果内部没有dnsmasq服务,可以参考部署文档文章: https://www.cnblogs.com/winstom/p/11809066.html

    使用域名为 : k8s.com,具体修改如下:

    /etc/dnsmasq_hosts新增下面内容

    192.168.1.91 etcd1 etcd1.k8s.com
    192.168.1.92 etcd2 etcd2.k8s.com
    192.168.1.93 etcd3 etcd3.k8s.com
    

    /etc/dnsmasq.conf 文件中增加下面SRV解析内容

    srv-host=_etcd-server._tcp.k8s.com,etcd1.k8s.com,2380,0,100
    srv-host=_etcd-server._tcp.k8s.com,etcd2.k8s.com,2380,0,100
    srv-host=_etcd-server._tcp.k8s.com,etcd3.k8s.com,2380,0,100
    srv-host=_etcd-client._tcp.k8s.com,etcd1.k8s.com,2379,0,100
    srv-host=_etcd-client._tcp.k8s.com,etcd2.k8s.com,2379,0,100
    srv-host=_etcd-client._tcp.k8s.com,etcd3.k8s.com,2379,0,100
    

    修改之后重启服务 systemctl restart dnsmasq

    验证SRV解析是否正常

    查询SRV记录

    [root@node01 ~]# dig @192.168.1.122 +noall +answer SRV _etcd-server._tcp.k8s.com
    _etcd-server._tcp.k8s.com. 3600	IN	SRV	2380 0 100 etcd2.k8s.com.
    _etcd-server._tcp.k8s.com. 3600	IN	SRV	2380 0 100 etcd1.k8s.com.
    _etcd-server._tcp.k8s.com. 3600	IN	SRV	2380 0 100 etcd3.k8s.com.
    

    查询域名解析结果

    [root@node01 ~]# dig @192.168.1.122 +noall +answer etcd1.k8s.com etcd2.k8s.com etcd3.k8s.com
    etcd1.k8s.com.		86400	IN	A	192.168.1.91
    etcd2.k8s.com.		86400	IN	A	192.168.1.92
    etcd3.k8s.com.		86400	IN	A	192.168.1.93
    

    如上述显示,则表示SRV解析正常

    配置ETCD

    node01 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="http://192.168.1.91:2380"
    ETCD_LISTEN_CLIENT_URLS="http://192.168.1.91:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd1"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="http://etcd1.k8s.com:2380"
    ETCD_ADVERTISE_CLIENT_URLS="http://etcd1.k8s.com:2379"
    ETCD_DISCOVERY_SRV="k8s.com"
    
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    

    node02 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="http://192.168.1.92:2380"
    ETCD_LISTEN_CLIENT_URLS="http://192.168.1.92:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd2"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="http://etcd2.k8s.com:2380"
    ETCD_ADVERTISE_CLIENT_URLS="http://etcd2.k8s.com:2379"
    ETCD_DISCOVERY_SRV="k8s.com"
    
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    

    node03 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="http://192.168.1.93:2380"
    ETCD_LISTEN_CLIENT_URLS="http://192.168.1.93:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd3"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="http://etcd3.k8s.com:2380"
    ETCD_ADVERTISE_CLIENT_URLS="http://etcd3.k8s.com:2379"
    ETCD_DISCOVERY_SRV="k8s.com"
    
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    

    启动并测试

    启动

    [root@node01 etcd]# systemctl start etcd
    [root@node01 etcd]# systemctl status etcd
    ● etcd.service - Etcd Server
       Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
       Active: active (running) since Thu 2019-11-07 11:25:29 CST; 4s ago
     Main PID: 14203 (etcd)
        Tasks: 8
       Memory: 16.9M
       CGroup: /system.slice/etcd.service
               └─14203 /usr/bin/etcd --name=etcd1 --data-dir=/data/k8s/etcd/data --listen-client-urls=http://192.168.1.91:2379
    
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: d79e9ae86b2a1de1 [quorum:2] has received 2 MsgVoteResp votes and 0 vote rejections
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: d79e9ae86b2a1de1 became leader at term 2
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: raft.node: d79e9ae86b2a1de1 elected leader d79e9ae86b2a1de1 at term 2
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: published {Name:etcd1 ClientURLs:[http://etcd1.k8s.com:2379 http://etcd1.k8s.com:4001]} to cluster 42cecf80e3791d6c
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: ready to serve client requests
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: serving insecure client requests on 192.168.1.91:2379, this is strongly discouraged!
    Nov 07 11:25:29 node01.k8s.com systemd[1]: Started Etcd Server.
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: setting up the initial cluster version to 3.3
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: set the initial cluster version to 3.3
    Nov 07 11:25:29 node01.k8s.com etcd[14203]: enabled capabilities for version 3.3
    
    

    日志 vim /var/log/messages 表现如下:

    Nov  7 11:25:27 node01 etcd: got bootstrap from DNS for etcd-server at 0=http://etcd3.k8s.com:2380
    Nov  7 11:25:27 node01 etcd: got bootstrap from DNS for etcd-server at 1=http://etcd2.k8s.com:2380
    Nov  7 11:25:27 node01 etcd: got bootstrap from DNS for etcd-server at etcd1=http://etcd1.k8s.com:2380
    Nov  7 11:25:27 node01 etcd: resolving etcd1.k8s.com:2380 to 192.168.1.91:2380
    Nov  7 11:25:27 node01 etcd: resolving etcd1.k8s.com:2380 to 192.168.1.91:2380
    Nov  7 11:25:28 node01 etcd: name = etcd1
    Nov  7 11:25:28 node01 etcd: data dir = /data/k8s/etcd/data
    Nov  7 11:25:28 node01 etcd: member dir = /data/k8s/etcd/data/member
    Nov  7 11:25:28 node01 etcd: dedicated WAL dir = /data/k8s/etcd/wal
    Nov  7 11:25:28 node01 etcd: heartbeat = 100ms
    Nov  7 11:25:28 node01 etcd: election = 1000ms
    Nov  7 11:25:28 node01 etcd: snapshot count = 100000
    Nov  7 11:25:28 node01 etcd: advertise client URLs = http://etcd1.k8s.com:2379,http://etcd1.k8s.com:4001
    Nov  7 11:25:28 node01 etcd: initial advertise peer URLs = http://etcd1.k8s.com:2380
    Nov  7 11:25:28 node01 etcd: initial cluster = 0=http://etcd3.k8s.com:2380,1=http://etcd2.k8s.com:2380,etcd1=http://etcd1.k8s.com:2380
    

    测试:

    [root@node01 etcd]# etcdctl --endpoints=http://192.168.1.91:2379 cluster-health
    member 184beca37ca32d75 is healthy: got healthy result from http://etcd2.k8s.com:2379
    member d79e9ae86b2a1de1 is healthy: got healthy result from http://etcd1.k8s.com:2379
    member f7662e609b7e4013 is healthy: got healthy result from http://etcd3.k8s.com:2379
    cluster is healthy
    

    ETCD TLS动态集群基于DNS的SRV解析自动发现

    需要局域网内部有DNS服务器

    添加SRV解析

    目前常用的内部DNS服务有两种,binddnsmasq

    在下面都会列出具体的配置,但只需要配置其中之一即可;

    方法一: 使用bind配置SRV解析

    如果内部没有bind服务,可以参考部署文档文章: https://www.cnblogs.com/winstom/p/11806962.html

    使用域名为 : k8s.com,在bind的zone文件中添加如下解析:

    etcd1   IN      A       192.168.1.91
    etcd2   IN      A       192.168.1.92
    etcd3   IN      A       192.168.1.93
    _etcd-server-ssl._tcp.k8s.com.  IN      SRV     10    10       2380     etcd1
    _etcd-server-ssl._tcp.k8s.com.  IN      SRV     10    10       2380     etcd2
    _etcd-server-ssl._tcp.k8s.com.  IN      SRV     10    10       2380     etcd3
    _etcd-client-ssl._tcp.k8s.com.  IN      SRV     10    10       2379     etcd1
    _etcd-client-ssl._tcp.k8s.com.  IN      SRV     10    10       2379     etcd2
    _etcd-client-ssl._tcp.k8s.com.  IN      SRV     10    10       2379     etcd3
    

    修改之后重新加载配置文件:

    [root@jenkins named]# named-checkzone k8s.com k8s.com.zone 
    zone k8s.com/IN: loaded serial 0
    OK
    [root@jenkins named]# rndc reload
    server reload successful
    

    方法二: 使用dnsmasq配置SRV解析

    如果内部没有dnsmasq服务,可以参考部署文档文章: https://www.cnblogs.com/winstom/p/11809066.html

    使用域名为 : k8s.com,具体修改如下:

    /etc/dnsmasq_hosts新增下面内容

    192.168.1.91 etcd1 etcd1.k8s.com
    192.168.1.92 etcd2 etcd2.k8s.com
    192.168.1.93 etcd3 etcd3.k8s.com
    

    /etc/dnsmasq.conf 文件中增加下面SRV解析内容

    srv-host=_etcd-server-ssl._tcp.k8s.com,etcd1.k8s.com,2380,0,100
    srv-host=_etcd-server-ssl._tcp.k8s.com,etcd2.k8s.com,2380,0,100
    srv-host=_etcd-server-ssl._tcp.k8s.com,etcd3.k8s.com,2380,0,100
    srv-host=_etcd-client-ssl._tcp.k8s.com,etcd1.k8s.com,2379,0,100
    srv-host=_etcd-client-ssl._tcp.k8s.com,etcd2.k8s.com,2379,0,100
    srv-host=_etcd-client-ssl._tcp.k8s.com,etcd3.k8s.com,2379,0,100
    

    修改之后重启服务 systemctl restart dnsmasq

    验证SRV解析是否正常

    查询SRV记录

    [root@node01 etcd]# dig @192.168.1.122 +noall +answer SRV _etcd-server-ssl._tcp.k8s.com
    _etcd-server-ssl._tcp.k8s.com. 3600 IN	SRV	2380 0 100 etcd3.k8s.com.
    _etcd-server-ssl._tcp.k8s.com. 3600 IN	SRV	2380 0 100 etcd2.k8s.com.
    _etcd-server-ssl._tcp.k8s.com. 3600 IN	SRV	2380 0 100 etcd1.k8s.com.
    

    查询域名解析结果

    [root@node01 ~]# dig @192.168.1.122 +noall +answer etcd1.k8s.com etcd2.k8s.com etcd3.k8s.com
    etcd1.k8s.com.		86400	IN	A	192.168.1.91
    etcd2.k8s.com.		86400	IN	A	192.168.1.92
    etcd3.k8s.com.		86400	IN	A	192.168.1.93
    

    ETCD 配置

    node01 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="https://192.168.1.91:2380"
    ETCD_LISTEN_CLIENT_URLS="https://192.168.1.91:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd1"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="https://etcd1.k8s.com:2380"
    ETCD_ADVERTISE_CLIENT_URLS="https://etcd1.k8s.com:2379,https://etcd1.k8s.com:4001"
    ETCD_DISCOVERY_SRV="k8s.com"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    
    ETCD_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_CLIENT_CERT_AUTH="true"
    ETCD_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_AUTO_TLS="true"
    ETCD_PEER_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_PEER_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_PEER_CLIENT_CERT_AUTH="true"
    ETCD_PEER_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_PEER_AUTO_TLS="true"
    

    node02 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="https://192.168.1.92:2380"
    ETCD_LISTEN_CLIENT_URLS="https://192.168.1.92:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd2"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="https://etcd2.k8s.com:2380"
    ETCD_ADVERTISE_CLIENT_URLS="https://etcd2.k8s.com:2379"
    ETCD_DISCOVERY_SRV="k8s.com"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    
    ETCD_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_CLIENT_CERT_AUTH="true"
    ETCD_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_AUTO_TLS="true"
    ETCD_PEER_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_PEER_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_PEER_CLIENT_CERT_AUTH="true"
    ETCD_PEER_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_PEER_AUTO_TLS="true"
    

    node03 配置文件

    ETCD_DATA_DIR="/data/k8s/etcd/data"
    ETCD_WAL_DIR="/data/k8s/etcd/wal"
    ETCD_LISTEN_PEER_URLS="https://192.168.1.93:2380"
    ETCD_LISTEN_CLIENT_URLS="https://192.168.1.93:2379"
    ETCD_MAX_SNAPSHOTS="5"
    ETCD_MAX_WALS="5"
    ETCD_NAME="etcd3"
    ETCD_SNAPSHOT_COUNT="100000"
    ETCD_HEARTBEAT_INTERVAL="100"
    ETCD_ELECTION_TIMEOUT="1000"
    
    ETCD_INITIAL_ADVERTISE_PEER_URLS="https://etcd3.k8s.com:2380"
    ETCD_ADVERTISE_CLIENT_URLS="https://etcd3.k8s.com:2379"
    ETCD_DISCOVERY_SRV="k8s.com"
    ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
    ETCD_INITIAL_CLUSTER_STATE="new"
    
    ETCD_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_CLIENT_CERT_AUTH="true"
    ETCD_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_AUTO_TLS="true"
    ETCD_PEER_CERT_FILE="/etc/etcd/cert/etcd.pem"
    ETCD_PEER_KEY_FILE="/etc/etcd/cert/etcd-key.pem"
    ETCD_PEER_CLIENT_CERT_AUTH="true"
    ETCD_PEER_TRUSTED_CA_FILE="/etc/kubernetes/cert/ca.pem"
    ETCD_PEER_AUTO_TLS="true"
    

    启动测试

    启动

    [root@node03 etcd]# systemctl restart etcd
    [root@node03 etcd]# systemctl status etcd
    ● etcd.service - Etcd Server
       Loaded: loaded (/usr/lib/systemd/system/etcd.service; disabled; vendor preset: disabled)
       Active: active (running) since Thu 2019-11-07 12:38:37 CST; 4s ago
     Main PID: 13460 (etcd)
        Tasks: 8
       Memory: 16.6M
       CGroup: /system.slice/etcd.service
               └─13460 /usr/bin/etcd --name=etcd3 --data-dir=/data/k8s/etcd/data --listen-client-urls=https://192.168.1.93:2379
    
    Nov 07 12:38:36 node03.k8s.com etcd[13460]: established a TCP streaming connection with peer 40a8f19a5db99534 (stream Message writer)
    Nov 07 12:38:36 node03.k8s.com etcd[13460]: established a TCP streaming connection with peer 40a8f19a5db99534 (stream MsgApp v2 writer)
    Nov 07 12:38:37 node03.k8s.com etcd[13460]: 9888555207dbf0e0 [term: 92] received a MsgVote message with higher term from a0d541999e9eb3b3 [term: 98]
    Nov 07 12:38:37 node03.k8s.com etcd[13460]: 9888555207dbf0e0 became follower at term 98
    Nov 07 12:38:37 node03.k8s.com etcd[13460]: 9888555207dbf0e0 [logterm: 92, index: 9, vote: 0] cast MsgVote for a0d541999e9eb3b3 [logterm: 92, index: 9] at term 98
    Nov 07 12:38:37 node03.k8s.com etcd[13460]: raft.node: 9888555207dbf0e0 elected leader a0d541999e9eb3b3 at term 98
    Nov 07 12:38:37 node03.k8s.com etcd[13460]: published {Name:etcd3 ClientURLs:[https://etcd3.k8s.com:2379]} to cluster f445a02ce3dc6a02
    Nov 07 12:38:37 node03.k8s.com etcd[13460]: ready to serve client requests
    Nov 07 12:38:37 node03.k8s.com etcd[13460]: serving client requests on 192.168.1.93:2379
    Nov 07 12:38:37 node03.k8s.com systemd[1]: Started Etcd Server.
    
    

    日志体现

    Nov  7 12:38:36 node01 etcd: added member 40a8f19a5db99534 [https://etcd2.k8s.com:2380] to cluster f445a02ce3dc6a02
    Nov  7 12:38:36 node01 etcd: starting peer 40a8f19a5db99534...
    Nov  7 12:38:36 node01 etcd: started HTTP pipelining with peer 40a8f19a5db99534
    Nov  7 12:38:36 node01 etcd: started streaming with peer 40a8f19a5db99534 (writer)
    Nov  7 12:38:36 node01 etcd: started peer 40a8f19a5db99534
    Nov  7 12:38:36 node01 etcd: added peer 40a8f19a5db99534
    Nov  7 12:38:36 node01 etcd: added member 9888555207dbf0e0 [https://etcd3.k8s.com:2380] to cluster f445a02ce3dc6a02
    Nov  7 12:38:36 node01 etcd: starting peer 9888555207dbf0e0...
    Nov  7 12:38:36 node01 etcd: started HTTP pipelining with peer 9888555207dbf0e0
    Nov  7 12:38:36 node01 etcd: started peer 9888555207dbf0e0
    Nov  7 12:38:36 node01 etcd: added peer 9888555207dbf0e0
    Nov  7 12:38:36 node01 etcd: added member a0d541999e9eb3b3 [https://etcd1.k8s.com:2380] to cluster f445a02ce3dc6a02
    

    测试集群状态:

    ETCDCTL_API=3 etcdctl --endpoints=https://etcd1.k8s.com:2379,https://etcd2.k8s.com:2379,https://etcd3.k8s.com:2379 
        --cacert=/etc/kubernetes/cert/ca.pem 
        --cert=/etc/etcd/cert/etcd.pem 
        --key=/etc/etcd/cert/etcd-key.pem endpoint health
    
    # 输出
    https://etcd1.k8s.com:2379 is healthy: successfully committed proposal: took = 4.269468ms
    https://etcd3.k8s.com:2379 is healthy: successfully committed proposal: took = 1.58797ms
    https://etcd2.k8s.com:2379 is healthy: successfully committed proposal: took = 1.622151ms
    
    etcdctl 
    --endpoint=https://etcd1.k8s.com:2379 
    --ca-file=/etc/kubernetes/cert/ca.pem 
    --cert-file=/etc/etcd/cert/etcd.pem 
    --key-file=/etc/etcd/cert/etcd-key.pem cluster-health
    
    # 输出
    member 40a8f19a5db99534 is healthy: got healthy result from https://etcd2.k8s.com:2379
    member 9888555207dbf0e0 is healthy: got healthy result from https://etcd3.k8s.com:2379
    member a0d541999e9eb3b3 is healthy: got healthy result from https://etcd1.k8s.com:2379
    cluster is healthy
    

    报错解决

    1. 证书报错 bad certificate

    日志中报错:

    Nov  7 12:37:03 node01 etcd: rejected connection from "192.168.1.93:46294" (error "remote error: tls: bad certificate", ServerName "k8s.com")
    

    解决

    报错的意思是在生成ETCD的TLS证书的时候,没有把对应的域名加进去

    在创建ETCD的TLS证书请求的文件中加入对应的域名

    cd /opt/k8s/work
    cat > etcd-csr.json <<EOF
    {
      "CN": "etcd",
      "hosts": [
        "127.0.0.1",
        "192.168.1.91",
        "192.168.1.92",
        "192.168.1.93",
        "k8s.com",          # 这里的域名查看是否正确
        "etcd1.k8s.com",
        "etcd2.k8s.com",
        "etcd3.k8s.com"
      ],
      "key": {
        "algo": "rsa",
        "size": 2048
      },
      "names": [
        {
          "C": "CN",
          "ST": "BeiJing",
          "L": "BeiJing",
          "O": "k8s",
          "OU": "4Paradigm"
        }
      ]
    }
    EOF
    

    2. DNSSRV 解析报错 cannot find local etcd member "etcd1" in SRV records

    DNS 如果配置有问题,会有如下报错:

    etcd: error setting up initial cluster: cannot find local etcd member "etcd1" in SRV records
    

    这里是表示DNS在配置SRV解析的时候报错,请仔细查看解析配置:

    SRV解析分为两种,一种是http不带证书的解析,一种是https带证书的解析,是有区别的,如果配置错误就会包上述错误

    http不带证书解析如下

    bind 的解析

    编辑 /var/named/k8s.com.zone 文件

    etcd1   IN      A       192.168.1.91
    etcd2   IN      A       192.168.1.92
    etcd3   IN      A       192.168.1.93
    _etcd-server._tcp.k8s.com.  IN      SRV     10    10       2380     etcd1
    _etcd-server._tcp.k8s.com.  IN      SRV     10    10       2380     etcd2
    _etcd-server._tcp.k8s.com.  IN      SRV     10    10       2380     etcd3
    _etcd-client._tcp.k8s.com.  IN      SRV     10    10       2379     etcd1
    _etcd-client._tcp.k8s.com.  IN      SRV     10    10       2379     etcd2
    _etcd-client._tcp.k8s.com.  IN      SRV     10    10       2379     etcd3
    

    dnsmasq 的解析

    /etc/dnsmasq_hosts新增下面内容

    192.168.1.91 etcd1 etcd1.k8s.com
    192.168.1.92 etcd2 etcd2.k8s.com
    192.168.1.93 etcd3 etcd3.k8s.com
    

    /etc/dnsmasq.conf 文件中增加下面SRV解析内容

    srv-host=_etcd-server._tcp.k8s.com,etcd1.k8s.com,2380,0,100
    srv-host=_etcd-server._tcp.k8s.com,etcd2.k8s.com,2380,0,100
    srv-host=_etcd-server._tcp.k8s.com,etcd3.k8s.com,2380,0,100
    srv-host=_etcd-client._tcp.k8s.com,etcd1.k8s.com,2380,0,100
    srv-host=_etcd-client._tcp.k8s.com,etcd2.k8s.com,2380,0,100
    srv-host=_etcd-client._tcp.k8s.com,etcd3.k8s.com,2380,0,100
    

    https带证书解析如下

    bind 的解析

    编辑 /var/named/k8s.com.zone 文件

    etcd1   IN      A       192.168.1.91
    etcd2   IN      A       192.168.1.92
    etcd3   IN      A       192.168.1.93
    _etcd-server-ssl._tcp.k8s.com.  IN      SRV     10    10       2380     etcd1
    _etcd-server-ssl._tcp.k8s.com.  IN      SRV     10    10       2380     etcd2
    _etcd-server-ssl._tcp.k8s.com.  IN      SRV     10    10       2380     etcd3
    _etcd-client-ssl._tcp.k8s.com.  IN      SRV     10    10       2379     etcd1
    _etcd-client-ssl._tcp.k8s.com.  IN      SRV     10    10       2379     etcd2
    _etcd-client-ssl._tcp.k8s.com.  IN      SRV     10    10       2379     etcd3
    

    dnsmasq 的解析

    /etc/dnsmasq_hosts新增下面内容

    192.168.1.91 etcd1 etcd1.k8s.com
    192.168.1.92 etcd2 etcd2.k8s.com
    192.168.1.93 etcd3 etcd3.k8s.com
    

    /etc/dnsmasq.conf 文件中增加下面SRV解析内容

    srv-host=_etcd-server-ssl._tcp.k8s.com,etcd1.k8s.com,2380,0,100
    srv-host=_etcd-server-ssl._tcp.k8s.com,etcd2.k8s.com,2380,0,100
    srv-host=_etcd-server-ssl._tcp.k8s.com,etcd3.k8s.com,2380,0,100
    srv-host=_etcd-client-ssl._tcp.k8s.com,etcd1.k8s.com,2379,0,100
    srv-host=_etcd-client-ssl._tcp.k8s.com,etcd2.k8s.com,2379,0,100
    srv-host=_etcd-client-ssl._tcp.k8s.com,etcd3.k8s.com,2379,0,100
    
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  • 原文地址:https://www.cnblogs.com/winstom/p/11811373.html
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