如何解决运行Hyperledger Fabric Gateway时DNS解析器提供了错误的IP地址
我正在运行一个JS文件，该文件充当Hyperledger Fabric网络上一组通道的侦听器。尽管我描述了以下错误，但侦听器仍能够基于控制台输出中的证据来侦听该频道（这使我感到困惑）（下面提供了摘录）。在此代码投入生产时，即使功能不受影响，我也需要解决所有错误。
所以我对以下JavaScript代码摘录有疑问：
let network,listener;
for (var i = 0; i < channelid.length; i++) {
let cid = channelid[i];
console.log(`Adding listener for channel ${cid}`);
network = await gateway.getNetwork(cid);
console.log(`await gateway.getNetwork`);
listener = await network.addBlockListener(
async (event) => {
await ProcessingMap.set(event.blockData.header.number,event.blockData);
console.log(
`Added block ${event.blockData.header.number} to ProcessingMap`,);
},{startBlock: parseInt(nextBlock,10)},);
console.log(`await network.addBlockListener`);
}
（完整代码可在https://pastebin.com/qqFPdVH6上找到）
当我使用export GRPC_VERBOSITY=DEBUG和export GRPC_TRACE=all运行此代码时，在行network = await gateway.getNetwork(cid)处收到以下错误（可以在以下位置找到有关开始读取块的完整日志： https://pastebin.com/ZxJBx4ub）
2020-10-06T07:43:24.424Z | resolving_load_balancer | dns:orderer1.isprint.com:7050 IDLE -> IDLE
2020-10-06T07:43:24.424Z | connectivity_state | dns:orderer1.isprint.com:7050 IDLE -> IDLE
2020-10-06T07:43:24.424Z | dns_resolver | Resolver constructed for target dns:orderer1.isprint.com:7050
2020-10-06T07:43:24.425Z | dns_resolver | Resolution update requested for target dns:orderer1.isprint.com:7050
2020-10-06T07:43:24.425Z | resolving_load_balancer | dns:orderer1.isprint.com:7050 IDLE -> CONNECTING
2020-10-06T07:43:24.425Z | connectivity_state | dns:orderer1.isprint.com:7050 IDLE -> CONNECTING
2020-10-06T07:43:24.426Z | resolving_load_balancer | dns:orderer1.isprint.com:7050 CONNECTING -> CONNECTING
2020-10-06T07:43:24.426Z | connectivity_state | dns:orderer1.isprint.com:7050 CONNECTING -> CONNECTING
2020-10-06T07:43:24.427Z | dns_resolver | Resolved addresses for target dns:orderer1.isprint.com:7050: [35.186.238.101:7050]
2020-10-06T07:43:24.427Z | pick_first | IDLE -> IDLE
2020-10-06T07:43:24.427Z | resolving_load_balancer | dns:orderer1.isprint.com:7050 CONNECTING -> IDLE
2020-10-06T07:43:24.427Z | connectivity_state | dns:orderer1.isprint.com:7050 CONNECTING -> IDLE
2020-10-06T07:43:24.427Z | pick_first | Connect to address list 35.186.238.101:7050
2020-10-06T07:43:24.427Z | subchannel | 35.186.238.101:7050 refcount 0 -> 1
2020-10-06T07:43:24.427Z | subchannel | 35.186.238.101:7050 refcount 1 -> 2
2020-10-06T07:43:24.427Z | pick_first | Start connecting to subchannel with address 35.186.238.101:7050
2020-10-06T07:43:24.427Z | pick_first | IDLE -> CONNECTING
2020-10-06T07:43:24.427Z | resolving_load_balancer | dns:orderer1.isprint.com:7050 IDLE -> CONNECTING
2020-10-06T07:43:24.427Z | connectivity_state | dns:orderer1.isprint.com:7050 IDLE -> CONNECTING
2020-10-06T07:43:24.427Z | subchannel | 35.186.238.101:7050 IDLE -> CONNECTING
2020-10-06T07:43:24.427Z | pick_first | CONNECTING -> CONNECTING
2020-10-06T07:43:24.427Z | resolving_load_balancer | dns:orderer1.isprint.com:7050 CONNECTING -> CONNECTING
2020-10-06T07:43:24.427Z | connectivity_state | dns:orderer1.isprint.com:7050 CONNECTING -> CONNECTING
2020-10-06T07:43:27.428Z - error: [ServiceEndpoint]: Error: Failed to connect before the deadline on Committer- name: orderer1.isprint.com:7050,url:grpcs://orderer1.isprint.com:7050,connected:false,connectAttempted:true
2020-10-06T07:43:27.429Z - error: [ServiceEndpoint]: waitForReady - Failed to connect to remote gRPC server orderer1.isprint.com:7050 url:grpcs://orderer1.isprint.com:7050 timeout:3000
2020-10-06T07:43:27.429Z - error: [DiscoveryService]: _buildOrderer[isprintchannel] - Unable to connect to the discovered orderer orderer1.isprint.com:7050 due to Error: Failed to connect before the deadline on Committer- name: orderer1.isprint.com:7050,connectAttempted:true
我不知道DNS解析器为什么给我奇怪的IP地址35.186.238.101，所以我做了nslookup 35.186.238.101：
[root@isprintdev nodejs]# nslookup 35.186.238.101
Server: 192.168.1.8
Address: 192.168.1.8#53
Non-authoritative answer:
101.238.186.35.in-addr.arpa name = 101.238.186.35.bc.googleusercontent.com.
Authoritative answers can be found from:
[root@isprintdev nodejs]#
可以在https://pastebin.com/Ppe9JPXR上找到连接配置文件。简而言之，我的网络由三个订购者和两个对等点组成，它们都在同一虚拟机上。
所以我的问题是：我需要在连接配置文件或JS代码中（或在任何必要的地方）更改某些内容，以确保不会出现此错误吗？
解决方法
playerJumps(Jumper j)具有公共DNS条目，并且显然具有通配符DNS A记录，可将playerRuns(Runner r)解析为isprint.com
*.isprint.com不确定您如何运行Fabric（Docker，二进制文件等），也不确定您如何运行客户端，但是您的JS应用看起来很可能直接在主机VM上运行，因此正在使用配置的DNS分辨率，如上解决。假设您的Fabric节点通过Docker / Docker Compose运行，则可以使用35.186.238.101来摆脱它们，因为它们将在外部DNS解析之前在Docker网络上进行解析。
因此，要保存您的问题，您需要创建一个HOSTS文件条目，该条目将您的端点映射到客户端可用于访问Fabric节点的VM内的IP。
在* nix系统上，您需要编辑MacBook-Pro:~ garis$ nslookup orderer1.isprint.com
Server: 192.168.1.1
Address: 192.168.1.1#53
Non-authoritative answer:
Name: orderer1.isprint.com
Address: 35.186.238.101
并添加如下条目：
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