[erlang-questions] minimal failure case for specifying mnesia directory

Loïc Hoguin <>
Mon Apr 7 13:20:09 CEST 2014


You have to tell relx about your sys.config file, it doesn't magically 
find it. From the relx wiki page:

%% If you have a sys.config file you need to tell relx where it is. If 
you do
%% that relx will include the sys.config in the appropriate place
%% automatically.
{sys_config, "./config/sys.config"}.

https://github.com/erlware/relx/wiki/configuration

On 04/07/2014 01:16 PM, t x wrote:
> Hi,
>
>    Here is my minimal failure case:
>
> https://github.com/txrev319/fail0
>
>    This is what's going on here. When I
>    * run _rel/bin/fail0 console
>    * and then I type in "mnesia:info()"
>
>    * I get /home/x/tmp/fail0/_rel/
>
> despite putting "/home/x/data" into priv/sys.config. See:
> https://github.com/txrev319/fail0/blob/master/priv/sys.config
>
>
>    I'm clearly doing something retarded. What am I doing wrong?
>
> Thanks!
>
> ## begin copy/paste
>
> :~/tmp/fail0$ _rel/bin/fail0 console
> Exec: /home/x/tmp/fail0/_rel/erts-6.0/bin/erlexec -boot
> /home/x/tmp/fail0/_rel/releases/1/fail0 -env ERL_LIBS
> /home/x/tmp/fail0/_rel/releases/1/lib -config
> /home/x/tmp/fail0/_rel/releases/1/sys.config -args_file
> /home/x/tmp/fail0/_rel/releases/1/vm.args -- console
> Root: /home/x/tmp/fail0/_rel
> Erlang/OTP 17 [RELEASE CANDIDATE 2] [erts-6.0] [source] [64-bit]
> [async-threads:10] [hipe] [kernel-poll:false]
>
> Eshell V6.0  (abort with ^G)
> ()1> mnesia:info().
> ---> Processes holding locks <---
> ---> Processes waiting for locks <---
> ---> Participant transactions <---
> ---> Coordinator transactions <---
> ---> Uncertain transactions <---
> ---> Active tables <---
> schema         : with 1        records occupying 397      words of mem
> ===> System info in version "4.12", debug level = none <===
> opt_disc. Directory "/home/x/tmp/fail0/_rel/" is NOT used.
> use fallback at restart = false
> running db nodes   = ['']
> stopped db nodes   = []
> master node tables = []
> remote             = []
> ram_copies         = [schema]
> disc_copies        = []
> disc_only_copies   = []
> [{'',ram_copies}] = [schema]
> 2 transactions committed, 0 aborted, 0 restarted, 0 logged to disc
> 0 held locks, 0 in queue; 0 local transactions, 0 remote
> 0 transactions waits for other nodes: []
> ok
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> 
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>

-- 
Loïc Hoguin
http://ninenines.eu



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