在谷歌云平台（GCP）上连接 Erlang/Elixir VM 节点的问题，相同的 VPC - 不同的区域，MNESIA 无法复制

Question

我正在尝试连接两个 Erlang VM（在 Centos 8、Erlang/OTP 23 上运行），一个位于 GCP us-east1-b 和其他 GCP europe-west6 上，它们都在同一个 VPC 内，在不同的子网上运行，我们- 东 10.33.0.0/16 欧西 10.88.0.0/16。 GCP 路由和防火墙应设置为允许跨这些子网和整个 VPC 的流量。 Ping 从 VM 工作到 VM（见下文）。 Telnet 适用于 erlang epmd 端口 4369。ISSUE - 当使用 erlang ping 实用程序将机器连接到机器时 net_adm:ping()/1 - 返回“pang”，表示未连接。

任何关于可能出现的问题的建议或想法，非常感谢！！！

这是关于设置的更多研究和事实。

注意 - GCP 防火墙规则，注意 GCP 网络“阻塞”测试连接的结果，并注意端口 35539 ​​和 42257 的 TELNET 响应未连接（这可能解释了为什么虚拟机返回“pang”或无法连接）

[g@app-server1-east ~]$ erl -name ack1@10.33.0.2 -setcookie whale
Erlang/OTP 23 [erts-11.1.3] [source] [64-bit] [smp:2:2] [ds:2:2:10] [asy
nc-threads:1] [hipe]
Eshell V11.1.3  (abort with ^G)
(ack1@10.33.0.2)1> net_adm:ping('ack2@10.88.0.2').
pang
(ack1@10.33.0.2)2> 

[g@app-server1-east ~]$ ping 10.88.0.2
PING 10.88.0.2 (10.88.0.2) 56(84) bytes of data.
64 bytes from 10.88.0.2: icmp_seq=1 ttl=64 time=105 ms
64 bytes from 10.88.0.2: icmp_seq=2 ttl=64 time=103 ms
64 bytes from 10.88.0.2: icmp_seq=3 ttl=64 time=104 ms
64 bytes from 10.88.0.2: icmp_seq=4 ttl=64 time=103 ms
64 bytes from 10.88.0.2: icmp_seq=5 ttl=64 time=103 ms
^C
--- 10.88.0.2 ping statistics ---
6 packets transmitted, 5 received, 16.6667% packet loss, time 12ms
rtt min/avg/max/mdev = 103.290/103.749/105.243/0.754 ms
[g@app-server1-east ~]$ epmd -names
epmd: up and running on port 4369 with data:
name ack1 at port 35539
[gbaird@app-server1-east ~]$ telnet 10.88.0.2 4369
Trying 10.88.0.2...
Connected to 10.88.0.2.
Escape character is '^]'.
exit
Connection closed by foreign host.
[g@app-server1-east ~]$ telnet 10.88.0.2 42257
Trying 10.88.0.2...
telnet: connect to address 10.88.0.2: Connection timed out here

---

[g@app-server2-eur ~]$ erl -name ack2@10.88.0.2 -setcookie whale
Erlang/OTP 23 [erts-11.1.3] [source] [64-bit] [smp:2:2] [ds:2:2:10] [asyn
c-threads:1] [hipe]
Eshell V11.1.3  (abort with ^G)
(ack2@10.88.0.2)1> node 
(ack2@10.88.0.2)1> .
node
(ack2@10.88.0.2)2> 
  

g@app-server2-eur ~]$ ping 10.33.0.2
PING 10.33.0.2 (10.33.0.2) 56(84) bytes of data.
64 bytes from 10.33.0.2: icmp_seq=1 ttl=64 time=105 ms
64 bytes from 10.33.0.2: icmp_seq=2 ttl=64 time=103 ms
64 bytes from 10.33.0.2: icmp_seq=3 ttl=64 time=103 ms
64 bytes from 10.33.0.2: icmp_seq=4 ttl=64 time=103 ms
^C
--- 10.33.0.2 ping statistics ---
5 packets transmitted, 4 received, 20% packet loss, time 10ms
rtt min/avg/max/mdev = 103.194/103.601/104.685/0.666 ms
[g@app-server2-eur ~]$ epmd -names
epmd: up and running on port 4369 with data:
name ack2 at port 42257
[gbaird@app-server2-eur ~]$ telnet 10.33.0.2 4369
Trying 10.33.0.2...
Connected to 10.33.0.2.
Escape character is '^]'.
exit
Connection closed by foreign host.
[g@app-server2-eur ~]$ telnet 10.33.0.2 35539
Trying 10.33.0.2...
telnet: connect to address 10.33.0.2: Connection timed out
[gbaird@app-server2-eur ~]$ 

Answer 1

Erlang 的 EPMD（Erlang Port Mapper Daemon）是监听 4369 端口的那个，但节点监听的是随机端口。

在建立集群时，节点在本地主机的 EPMD 中注册它的端口，并联系远程主机的 EPMD 以查询远程节点的实际端口，然后流量直接进入该端口。 EPMD 不是中继。

您可以控制节点通过kernel configuration 侦听的端口范围，尤其是inet_dist_listen_min 和inet_dist_listen_max，允许它们在FW 中