本篇安装单个etcd，然后进行扩容etcd节点至2个，环境配置如果做了的话就跳过 实验架构 test1: 192.168.0.91 etcd test2: 192.168.0.92 无 test3: 192.168.0.93 无 1、环境配置 # 如下操作在所有节点操作 修改主机名 # 注意修改 各自节点对应的 主机名 sed -i '$ahostname=test1' /etc/hostname sed -i '$ahostname=test1' /etc/sysconfig/network && hostnamectl set-hostname test1 配置hosts解析 cat >>/etc/hosts<<EOF 192.168.0.91 test1 192.168.0.92 test2 192.168.0.93 test3 EOF 禁用selinux sed -i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinux sed -i 's/enforcing/disabled/g' /etc/selinux/config 关闭swap # 注释/etc/fstab文件里swap相关的行 sed -i 's//dev/mapper/centos-swap/#/dev/mapper/centos-swap/g' /etc/fstab 关掉防火墙 systemctl stop firewalld && systemctl disable firewalld 退出xshell重新登录，查看主机名 开启forward iptables -P FORWARD ACCEPT 配置转发相关参数 cat >> /etc/sysctl.d/k8s.conf <<EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 vm.swappiness=0 EOF 加载系统参数 sysctl --system 加载ipvs相关内核模块 # 如果重新开机，需要重新加载 modprobe ip_vs modprobe ip_vs_rr modprobe ip_vs_wrr modprobe ip_vs_sh modprobe nf_conntrack_ipv4 lsmod | grep ip_vs 安装etcd 下面几步都在test1 节点操作 下载安装包 useradd etcd mkdir -p /server/software/k8s mkdir -p /opt/k8s/bin cd /server/software/k8s wget https://github.com/coreos/etcd/releases/download/v3.2.18/etcd-v3.2.18-linux-amd64.tar.gz tar -xf etcd-v3.2.18-linux-amd64.tar.gz mv etcd-v3.2.18-linux-amd64/etcd* /opt/k8s/bin chmod +x /opt/k8s/bin/* ln -s /opt/k8s/bin/etcd /usr/bin/etcd ln -s /opt/k8s/bin/etcdctl /usr/bin/etcdctl etcd --version 2、安装CFSSL证书生成工具 只在test1节点操作 mkdir -pv /server/software/k8s cd /server/software/k8s wget下载cfssl工具 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 安装cfssl工具 # 只要把安装包改下名字，移动到usr/local/bin/下，加上授权即可 mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo mv cfssl_linux-amd64 /usr/local/bin/cfssl mv cfssljson_linux-amd64 /usr/local/bin/cfssljson chmod +x /usr/local/bin/cfssl* 3、创建PKI配置文件 # 只 在test1节点操作 # 作用：生成其他组件ca证书时需要用到(除了根证书)CA 配置文件 mkdir -p $HOME/ssl && cd $HOME/ssl cat >ca-config.json<<EOF { "signing": { "default": { "expiry": "87600h" }, "profiles": { "kubernetes": { "usages": [ "signing", "key encipherment", "server auth", "client auth" ], "expiry": "87600h" } } } } EOF 注意：PKI配置文件中的profiles中同时定义了 server、clietns，表明使用这个PKI创建的证书既可以作为服务器验证用，也可以作为客户端验证用 这里对PKI安全认证不做过多解释， PKI安全认证请参照：https://www.cnblogs.com/effortsing/p/10332492.html 4、生成 ca 根证书 # 只在test1节点操作 # ca 证书作用：生成其他组件证书时需要用到根证书 cd $HOME/ssl cat >ca-csr.json<<EOF { "CN": "kubernetes", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "k8s", "OU": "System" } ], "ca": { "expiry": "87600h" } } EOF 生成证书 cfssl gencert -initca ca-csr.json | cfssljson -bare ca 查看生成的证书 [root@test1 ssl]# ls ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem 5、添加证书到受信任列表（选做） # 在 test1 节点操作 # 添加ca证书到linux系统受信任列表,这样在执行命令的时候就不用带上证书路径了。 # 添加信任后： etcdctl cluster-health = etcdctl cluster-health /etc/kubernetes/cert/ca.pem ，就是省了个证书 # 如果没有添加ca证书到linux系统受信任列表，后面执行etcdctl cluster-health 会报如下错误。 cat ca.pem >> /etc/pki/tls/certs/ca-bundle.crt 6、管理证书 # 把根证书和私钥复制到一个目录里面 mkdir -p /etc/kubernetes/cert/ cp ca*.pem /etc/kubernetes/cert/ chmod 777 /etc/kubernetes/* 5、生成etcd的ca证书和私钥 # 只在test1节点上操作 cd $HOME/ssl cat >etcd-csr.json<<EOF { "CN": "etcd", "hosts": [ "127.0.0.1", "192.168.0.92", "192.168.0.93", "192.168.0.91" ], "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "BeiJing", "L": "BeiJing", "O": "etcd", "OU": "Etcd Security" } ] } EOF 生成证书 cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes etcd-csr.json | cfssljson -bare etcd 查看生成的证书和私钥 [root@test1 ssl]# ls ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem etcd.csr etcd-csr.json etcd-key.pem etcd.pem 6、添加证书到受信任列表（选做） # 在 test1 节点操作 # 添加ca证书到linux系统受信任列表 cat etcd.pem >> /etc/pki/tls/certs/ca-bundle.crt 7、管理证书 把etcd证书复制到一个目录里面 mkdir -p /etc/etcd/cert/ cp etcd*.pem /etc/etcd/cert/ chmod 777 /etc/etcd/cert/* 8、启动etcd 8.1、 配置etcd启动脚本 # 配置 环境变量 cat >> /etc/profile << EOF export ETCD_NAME=$(hostname) export INTERNAL_IP=$(hostname -i | awk '{print $NF}') export ECTD_CLUSTER='test1=https://192.168.0.91:2380' EOF source /etc/profile 8.2、配置启动文件 本文配置文件开启了集群外部服务端、客户端、认证，以及集群内部之间服务端、客户端认证。所以客户端etcdctl访问时候需要带上客户端证书 mkdir -p /data/etcd cat> /etc/systemd/system/etcd.service<< EOF [Service] Type=notify WorkingDirectory=/data/etcd EnvironmentFile=-/etc/etcd/etcd.conf ExecStart=/opt/k8s/bin/etcd \ --name ${ETCD_NAME} \ --cert-file=/etc/etcd/cert/etcd.pem \ --key-file=/etc/etcd/cert/etcd-key.pem \ --peer-cert-file=/etc/etcd/cert/etcd.pem \ --peer-key-file=/etc/etcd/cert/etcd-key.pem \ --trusted-ca-file=/etc/kubernetes/cert/ca.pem \ --peer-trusted-ca-file=/etc/kubernetes/cert/ca.pem \ --initial-advertise-peer-urls https://${INTERNAL_IP}:2380 \ --listen-peer-urls https://${INTERNAL_IP}:2380 \ --listen-client-urls https://${INTERNAL_IP}:2379,http://127.0.0.1:2379 \ --advertise-client-urls https://${INTERNAL_IP}:2379 \ --initial-cluster-token my-etcd-token \ --initial-cluster $ECTD_CLUSTER \ --initial-cluster-state new \ --data-dir=/data/etcd Restart=on-failure RestartSec=5 LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF 8.3、启动etctd systemctl daemon-reload #一定要执行，否则报错 systemctl start etcd systemctl status etcd systemctl enable etcd 9、查看集群成员和安全状态 必须得带上证书，涉及到服务端、客户端认证 [root@test1 ~]# etcdctl --ca-file /etc/kubernetes/cert/ca.pem --cert-file /etc/etcd/cert/etcd.pem --key-file /etc/etcd/cert/etcd-key.pem member list 42f7141ed6110de1: name=test1 peerURLs=https://192.168.0.91:2380 clientURLs=https://192.168.0.91:2379 isLeader=true [root@test1 ~]# etcdctl --ca-file /etc/kubernetes/cert/ca.pem --cert-file /etc/etcd/cert/etcd.pem --key-file /etc/etcd/cert/etcd-key.pem cluster-health member 42f7141ed6110de1 is healthy: got healthy result from https://192.168.0.91:2379 cluster is healthy 可以看到peerURLs已经是https模式了，由于test1节点是新建的集群，所以属于重建集群开启pki安全认证； 这里对pki安全认证不多做解释，具体请参照：https://www.cnblogs.com/effortsing/p/10332492.html 报错解决： 删除etcd数据目录重新启动 参照文档： http://www.maogx.win/posts/35/ http://www.maogx.win/ https://juejin.im/user/59ffa2836fb9a0451c39c64f/posts https://blog.csdn.net/fy573060627/article/details/52872740