[erlang-questions] how: Simple distributed Erlang in docker containers

[Bengt Kleberg]

Thank you for showing a way forward.


Since "-name n@REDACTED" is undocumented, I wonder if there is another 
possibility to use distributed Erlang with Docker?


bengt

On 05/16/2016 05:30 PM, Peter Morgan wrote:
> Hello -
>
> Shell A:
>
> docker run -it --rm erlang bash
> root@REDACTED:/# ip addr show dev eth0
> 794: eth0@REDACTED: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
>      link/ether 02:42:ac:11:00:07 brd ff:ff:ff:ff:ff:ff
>      inet 172.17.0.7/16 scope global eth0
>         valid_lft forever preferred_lft forever
>      inet6 fe80::42:acff:fe11:7/64 scope link
>         valid_lft forever preferred_lft forever
>
> erl -name a@REDACTED -setcookie abc
> Erlang/OTP 18 [erts-7.3.1] [source] [64-bit] [smp:6:6] [async-threads:10] [hipe] [kernel-poll:false]
>
> Eshell V7.3.1  (abort with ^G)
> (a@REDACTED)1>
>
>
> Shell B:
>
> docker run -it --rm erlang bash
> 796: eth0@REDACTED: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
>      link/ether 02:42:ac:11:00:08 brd ff:ff:ff:ff:ff:ff
>      inet 172.17.0.8/16 scope global eth0
>         valid_lft forever preferred_lft forever
>      inet6 fe80::42:acff:fe11:8/64 scope link
>         valid_lft forever preferred_lft forever
>
> erl -name b@REDACTED -setcookie abc
> Erlang/OTP 18 [erts-7.3.1] [source] [64-bit] [smp:6:6] [async-threads:10] [hipe] [kernel-poll:false]
>
> Eshell V7.3.1  (abort with ^G)
> (b@REDACTED)1> net_adm:ping('a@REDACTED').
> pong
> (b@REDACTED)2>
>
>
> Take a look at the "--add-host=“ parameter to docker run, rather than modifying /etc/hosts.
>
> Thanks
> Peter.
>
>
>> On 16 May 2016, at 13:58, Bengt Kleberg <bengt.kleberg@REDACTED> wrote:
>>
>> Greetings,
>>
>> What is needed to get two Erlang nodes talking if they are in Docker containers (on the same machine)?
>> net_kernel:connect/1 fails.
>>
>>
>> I have started 2 Docker containers (kalle and gustav) and it is possible to do
>> ping kalle
>> PING kalle.asd.se (172.17.0.4) 56(84) bytes of data.
>> 64 bytes from kalle.asd.se (172.17.0.4): icmp_seq=1 ttl=64 time=0.137 ms
>>
>> and
>> ping gustav
>> PING gustav.asd.se (172.17.0.5) 56(84) bytes of data.
>> 64 bytes from gustav.asd.se (172.17.0.5): icmp_seq=1 ttl=64 time=0.147 ms
>>
>>
>> Starting Erlang like this:
>> erl -sname n -setcookie asd
>> Erlang/OTP 17 [erts-6.3] [source] [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false]
>>
>> Eshell V6.3  (abort with ^G)
>> (n@REDACTED)1>  net_kernel:connect('n@REDACTED').
>> false
>>
>> and, from the other side:
>> erl -sname n -setcookie asd
>> Erlang/OTP 17 [erts-6.3] [source] [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false]
>>
>> Eshell V6.3  (abort with ^G)
>> (n@REDACTED)1> net_kernel:connect('n@REDACTED').
>> false
>>
>>
>> bengt
>> (*) I manually added them to their respective /etc/hosts. If there is a way to do it automatically I would like to know.
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