在k8s-master01上操作

1. 创建工作目录

mkdir -p /data/k8s-work

2. 获取cfssl工具

cd /data/k8s-work
wget --no-check-certificate https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget --no-check-certificate https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget --no-check-certificate https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64

如果下载失败可以单独加群联系

说明：
cfssl是使用go编写，由CloudFlare开源的一款PKI/TLS工具。主要程序有：

- cfssl，是CFSSL的命令行工具
- cfssljson用来从cfssl程序获取JSON输出，并将证书，密钥，CSR和bundle写入文件中。

chmod +x cfssl*

mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo

# cfssl version
Version: 1.2.0
Revision: dev
Runtime: go1.6

3. 创建CA证书

3.1 配置ca证书请求文件

cat > ca-csr.json <<EOF
{
  "CN": "kubernetes",
  "key": {
      "algo": "rsa",
      "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Beijing",
      "L": "Beijing",
      "O": "kubemsb",
      "OU": "CN"
    }
  ],
  "ca": {
          "expiry": "876000h"
  }
}
EOF

3.2 创建ca证书

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

3.3 配置ca证书策略

cfssl print-defaults config > ca-config.json

cat > ca-config.json <<"EOF"
{
  "signing": {
      "default": {
          "expiry": "876000h"
        },
      "profiles": {
          "kubernetes": {
              "usages": [
                  "signing",
                  "key encipherment",
                  "server auth",
                  "client auth"
              ],
              "expiry": "876000h"
          }
      }
  }
}
EOF

server auth 表示client可以对使用该ca对server提供的证书进行验证

client auth 表示server可以使用该ca对client提供的证书进行验证

4 创建etcd证书

4.1 配置etcd请求文件

cat > etcd-csr.json <<EOF
{
  "CN": "etcd",
  "hosts": [
    "127.0.0.1",
    "192.168.31.34",
    "192.168.31.35",
    "192.168.31.36"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [{
    "C": "CN",
    "ST": "Beijing",
    "L": "Beijing",
    "O": "kubemsb",
    "OU": "CN"
  }]
}
EOF

4.2 生成etcd证书

cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes etcd-csr.json | cfssljson  -bare etcd

# ls
输出
ca-config.json  ca.csr  ca-csr.json  ca-key.pem  ca.pem  etcd.csr  etcd-csr.json  etcd-key.pem  etcd.pem

5 部署etcd集群

5.1 下载etcd软件包

wget https://github.com/etcd-io/etcd/releases/download/v3.5.10/etcd-v3.5.10-linux-amd64.tar.gz

如果下载失败可以单独加群联系

5.2 安装etcd软件

tar -xvf etcd-v3.5.10-linux-amd64.tar.gz
cp -p etcd-v3.5.10-linux-amd64/etcd* /usr/local/bin/

5.3 分发etcd软件

scp etcd-v3.5.10-linux-amd64/etcd* k8s-master02:/usr/local/bin/

scp etcd-v3.5.10-linux-amd64/etcd* k8s-master03:/usr/local/bin/

5.4 创建配置文件

mkdir /etc/etcd

cat >  /etc/etcd/etcd.conf <<EOF
#[Member]
ETCD_NAME="etcd1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.31.34:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.31.34:2379,http://127.0.0.1:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.31.34:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.31.34:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.31.34:2380,etcd2=https://192.168.31.35:2380,etcd3=https://192.168.31.36:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

说明：
ETCD_NAME：节点名称，集群中唯一
ETCD_DATA_DIR：数据目录
ETCD_LISTEN_PEER_URLS：集群通信监听地址
ETCD_LISTEN_CLIENT_URLS：客户端访问监听地址
ETCD_INITIAL_ADVERTISE_PEER_URLS：集群通告地址
ETCD_ADVERTISE_CLIENT_URLS：客户端通告地址
ETCD_INITIAL_CLUSTER：集群节点地址
ETCD_INITIAL_CLUSTER_TOKEN：集群Token
ETCD_INITIAL_CLUSTER_STATE：加入集群的当前状态，new是新集群，existing表示加入已有集群

5.5 创建服务配置文件

mkdir -p /etc/etcd/ssl
mkdir -p /var/lib/etcd/default.etcd

cd /data/k8s-work
cp ca*.pem /etc/etcd/ssl
cp etcd*.pem /etc/etcd/ssl

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

[Service]
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/local/bin/etcd \
  --cert-file=/etc/etcd/ssl/etcd.pem \
  --key-file=/etc/etcd/ssl/etcd-key.pem \
  --trusted-ca-file=/etc/etcd/ssl/ca.pem \
  --peer-cert-file=/etc/etcd/ssl/etcd.pem \
  --peer-key-file=/etc/etcd/ssl/etcd-key.pem \
  --peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
  --peer-client-cert-auth \
  --client-cert-auth
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

5.6 同步etcd配置到集群其它master节点

创建目录
mkdir -p /etc/etcd
mkdir -p /etc/etcd/ssl
mkdir -p /var/lib/etcd/default.etcd

服务配置文件,需要修改etcd节点名称及IP地址
for i in k8s-master02 k8s-master03 \
do \
scp /etc/etcd/etcd.conf $i:/etc/etcd/ \
done

k8s-master02:

cat > /etc/etcd/etcd.conf <<EOF
#[Member]
ETCD_NAME="etcd2"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.31.35:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.31.35:2379,http://127.0.0.1:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.31.35:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.31.35:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.31.34:2380,etcd2=https://192.168.31.35:2380,etcd3=https://192.168.31.36:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

k8s-master03:

cat > /etc/etcd/etcd.conf<<EOF
#[Member]
ETCD_NAME="etcd3"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.31.36:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.31.36:2379,http://127.0.0.1:2379"

#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.31.36:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.31.36:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.31.34:2380,etcd2=https://192.168.31.35:2380,etcd3=https://192.168.31.36:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF

证书文件
for i in k8s-master02 k8s-master03 \
do \
scp /etc/etcd/ssl/* $i:/etc/etcd/ssl \
done

服务启动配置文件
for i in k8s-master02 k8s-master03 \
do \
scp /etc/systemd/system/etcd.service $i:/etc/systemd/system/ \
done

5.7 启动etcd集群

systemctl daemon-reload
systemctl enable --now etcd.service
systemctl status etcd

5.8 验证集群状态

ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.31.34:2379,https://192.168.31.35:2379,https://192.168.31.36:2379 endpoint health

+----------------------------+--------+-------------+-------+
|          ENDPOINT          | HEALTH |    TOOK     | ERROR |
+----------------------------+--------+-------------+-------+
| https://192.168.31.34:2379 |   true | 10.393062ms |       |
| https://192.168.31.35:2379 |   true |  15.70437ms |       |
| https://192.168.31.36:2379 |   true | 15.871684ms |       |
+----------------------------+--------+-------------+-------+

检查ETCD数据库性能
ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.31.34:2379,https://192.168.31.35:2379,https://192.168.31.36:2379 check perf

[root@k8s-master01 k8s-work]# ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.31.34:2379,https://192.168.31.35:2379,https://192.168.31.36:2379 check perf
 59 / 60 Booooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooom  !  98.33%PASS: Throughput is 151 writes/s
PASS: Slowest request took 0.011820s
PASS: Stddev is 0.000712s
PASS

ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.31.34:2379,https://192.168.31.35:2379,https://192.168.31.36:2379 member list

+------------------+---------+-------+----------------------------+----------------------------+------------+
|        ID        | STATUS  | NAME  |         PEER ADDRS         |        CLIENT ADDRS        | IS LEARNER |
+------------------+---------+-------+----------------------------+----------------------------+------------+
|  571a14daac64a5f | started | etcd3 | https://192.168.31.36:2380 | https://192.168.31.36:2379 |      false |
| c1975c3c20f6f75b | started | etcd1 | https://192.168.31.34:2380 | https://192.168.31.34:2379 |      false |
| fed2d7ddda540f99 | started | etcd2 | https://192.168.31.35:2380 | https://192.168.31.35:2379 |      false |
+------------------+---------+-------+----------------------------+----------------------------+------------+

ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.31.34:2379,https://192.168.31.35:2379,https://192.168.31.36:2379 endpoint status

+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
|          ENDPOINT          |        ID        | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| https://192.168.31.34:2379 | c1975c3c20f6f75b |  3.5.10 |   22 MB |      true |      false |         2 |       9010 |               9010 |        |
| https://192.168.31.35:2379 | fed2d7ddda540f99 |  3.5.10 |   22 MB |     false |      false |         2 |       9010 |               9010 |        |
| https://192.168.31.36:2379 |  571a14daac64a5f |  3.5.10 |   22 MB |     false |      false |         2 |       9010 |               9010 |        |
+----------------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+