一、首先，要使用cfssl生成etcd证书相关的文件(ca.pem server.pem server-key.pem ),然后把server-key.pem进行转换：

openssl pkcs8 -topk8 -nocrypt -in server-key.pem -out server.key

二、带证书启动etcd

./etcd --name infra0   --cert-file=/root/server.pem --key-file=/root/server-key.pem   --advertise-client-urls=https://0.0.0.0:2379 --listen-client-urls=https://0.0.0.0:2379

可通过etcdctl 进行连接验证

./etcdctl --cacert=/root/ca.pem --cert=/root/server.pem --key=/root/server-key.pem --endpoints="https://10.180.23.10:2379" get Elon

三、在java项目中添加相关依赖，完整依赖类似如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>springbootetcd3</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target></properties><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.6</version><relativePath/> <!-- lookup parent from repository --></parent><dependencies><dependency><groupId>io.etcd</groupId><artifactId>jetcd-core</artifactId><version>0.7.7</version></dependency><!-- https://mvnrepository.com/artifact/com.coreos/jetcd-core -->
<!--        <dependency><groupId>com.coreos</groupId><artifactId>jetcd-core</artifactId><version>0.0.2</version></dependency>--><!--                <dependency><groupId>io.etcd</groupId><artifactId>jetcd-core</artifactId><version>0.5.0</version></dependency>--><!--        <dependency><groupId>io.grpc</groupId><artifactId>grpc-netty-shaded</artifactId><version>1.50.0</version></dependency>--><!-- https://mvnrepository.com/artifact/io.netty/netty-all --><dependency><groupId>io.netty</groupId><artifactId>netty-all</artifactId><version>4.1.90.Final</version></dependency><!-- https://mvnrepository.com/artifact/io.netty/netty-tcnative --><dependency><groupId>io.netty</groupId><artifactId>netty-tcnative</artifactId><version>2.0.65.Final</version></dependency><!-- https://mvnrepository.com/artifact/io.netty/netty-tcnative-boringssl-static --><dependency><groupId>io.netty</groupId><artifactId>netty-tcnative-boringssl-static</artifactId><version>2.0.65.Final</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies></project>

四、创建客户端，访问etcd

package cn.edu.tju;import io.etcd.jetcd.ByteSequence;
import io.etcd.jetcd.Client;
import io.etcd.jetcd.KV;
import io.etcd.jetcd.api.PutResponse;
import io.grpc.netty.GrpcSslContexts;
import io.netty.handler.ssl.SslContext;import java.io.File;
import java.io.IOException;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;public class EtcdExample {public static void main(String[] args) throws IOException, ExecutionException, InterruptedException {File cert = new File("d:\\ca.pem");File keyCertChainFile = new File("d:\\server.pem");File keyFile = new File("d:\\server.key");SslContext context = GrpcSslContexts.forClient().trustManager(cert).keyManager(keyCertChainFile, keyFile).build();Client client = Client.builder().endpoints("https://xx.xx.xx.xx:2379").sslContext(context).build();ByteSequence key = ByteSequence.from("Elon".getBytes());ByteSequence value = ByteSequence.from("Musk".getBytes());// put the key-valueclient.getKVClient().put(key,value).get();System.out.println("ok");}
}