Docker部署elasticsearch 6.8集群

1、生成ssl证书

该步骤仅需要在任意一台服务器上执行一次

mkdir -p /usr/local/elasticsearch/config/certs

# 运行容器
docker run -it --rm -v /usr/local/elasticsearch/config/certs:/usr/share/elasticsearch/config/certs elasticsearch:6.8.13 bash

# 进入证书保存目录
cd config/certs

elasticsearch-certutil ca
# 有输入的地方直接回车即可
elasticsearch-certutil cert --ca elastic-stack-ca.p12
# 有输入的地方还是直接回车

# 退出容器
exit

# 进入宿主机证书保存目录
cd /usr/local/elasticsearch/config/certs/

# 压缩生成的证书，这个证书需要同步给所有服务器
tar -zcvf certs.tar.gz *

2、证书配置

mkdir -p /usr/local/elasticsearch/config/certs/
# 将第一步生成的certs.tar.gz上传到服务器/usr/local/elasticsearch/config/certs/目录下
tar -xvf certs.tar.gz

3、准备配置文件elasticsearch.yml

配置文件需要修改
node.name: 节点名称，不同的节点使用不同的名称
discovery.zen.ping.unicast.hosts: 多个节点的ip列表

mkdir -p /usr/local/elasticsearch/config/

cat <

4、启动镜像

docker run -d --name elasticsearch \
     -v /usr/local/elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml \
     -v /usr/local/elasticsearch/config/certs:/usr/share/elasticsearch/config/certs \
     -v /usr/local/elasticsearch/plugins:/usr/share/elasticsearch/plugins \
     -v /usr/local/elasticsearch/data:/usr/share/elasticsearch/data \
     -v /etc/localtime:/etc/localtime \
     -e ES_JAVA_OPTS="-Xms1G -Xmx1G" \
     --restart=always \
     --net host \
     elasticsearch:6.8.13

ES_JAVA_OPTS="-Xms1G -Xmx1G" 配置elasticsearch的运行内存

5、在需要部署的服务器上重复上面的步骤

6、配置密码

登录任意一台服务器

docker exec -it elasticsearch bash

elasticsearch-setup-passwords interactive
# 按提示重复输入你需要设置的密码

需要注意，集群添加认证后，java客户端连接时也需要配置证书

public class EsConfig {
    private String userPassword;
    private String clusterName;
    private String isCluster;
    private String host;
    private int port;

    @Bean
    public TransportClient transportClient() throws UnknownHostException {
        // 解决netty-transport版本冲突
        System.setProperty("es.set.netty.runtime.available.processors", "false");
        Settings.Builder builder = Settings.builder()
                .put("xpack.security.user", userPassword)
                .put("cluster.name", clusterName);
        // 如果连接的ES集群,需要添加的配置
        if ("true".equals(isCluster)) {
            log.info("===> use ssl connection");
            builder.put("xpack.security.transport.ssl.enabled", true)
                    .put("xpack.security.transport.ssl.verification_mode", "certificate")
                    .put("xpack.security.transport.ssl.keystore.path", "certs/elastic-certificates.p12")
                    .put("xpack.security.transport.ssl.truststore.path", "certs/elastic-certificates.p12");
        }

        return new PreBuiltXPackTransportClient(builder.build())
                .addTransportAddress(new TransportAddress(InetAddress.getByName(host), port));
    }
}

至此，es集群搭建就完成了