cannot create regular file ‘/data/apps/appname/var/vm.args.bak’: File exists

[suexcxine]

Steps to reproduce

use supervisord to start multiple instances

Verbose Logs

supervisor> start ribbon:
ribbon:ribbon_1: started
ribbon:ribbon_0: started
supervisor> tail -f ribbon:ribbon_0 stderr
==> Press Ctrl-C to exit <==
Kernel pid terminated (application_controller) ({application_start_failure,ribbon,{bad_return,{{'Elixir.Ribbon.Application',start,[normal,[]]},{'EXIT',{{badmatch,{error,{shutdown,{failed_to_start_chil

Crash dump is being written to: erl_crash.dump...done
cp: cannot create regular file ‘/data/apps/ribbon/var/vm.args.bak’: File exists
2020-03-23 18:06:45.052733 Multiple -~p given to erl, using the first, ~p
                Protocol 'inet_tcp': the name ribbon1@10.52.3.41 seems to be in use by another Erlang node
Protocol 'inet_tcp': the name ribbon0@10.52.3.41 seems to be in use by another Erlang node

Description of issue

• What version of Distillery?
  2.1.1
• What OS, Erlang/Elixir versions are you seeing this issue on?
  CentOS 7
• If possible, also provide your rel/config.exs, as it is often
  my first troubleshooting question, and you'll save us both time :)

# Import all plugins from `rel/plugins`
# They can then be used by adding `plugin MyPlugin` to
# either an environment, or release definition, where
# `MyPlugin` is the name of the plugin module.
~w(rel plugins *.exs)
|> Path.join()
|> Path.wildcard()
|> Enum.map(&Code.eval_file(&1))

use Distillery.Releases.Config,
    # This sets the default release built by `mix distillery.release`
    default_release: :default,
    # This sets the default environment used by `mix distillery.release`
    default_environment: Mix.env()

# For a full list of config options for both releases
# and environments, visit https://hexdocs.pm/distillery/config/distillery.html


# You may define one or more environments in this file,
# an environment's settings will override those of a release
# when building in that environment, this combination of release
# and environment configuration is called a profile

environment :dev do
  # If you are running Phoenix, you should make sure that
  # server: true is set and the code reloader is disabled,
  # even in dev mode.
  # It is recommended that you build with MIX_ENV=prod and pass
  # the --env flag to Distillery explicitly if you want to use
  # dev mode.
  set dev_mode: true
  set include_erts: false
  set cookie: :"WW:`4m$YU76?D^g;wD5XI$?=Y%N.dSkY$M[XIeE_p>&(pv&)t&pBorR0tNmH5hI9"
  set vm_args: "rel/vm.args"
end

environment :prod do
  set include_erts: true
  set include_src: false
  set cookie: :"Gu31aozN7M(EG0K!HRW4t{TRN(7uED?dL|<=@EaJ2=D)jM~]W/yN4g5_[Wvt{GTR"
  set vm_args: "rel/vm.args"
end

# You may define one or more releases in this file.
# If you have not set a default release, or selected one
# when running `mix distillery.release`, the first release in the file
# will be used by default

release :ribbon do
  set version: current_version(:ribbon)
  set applications: [
    :runtime_tools
  ]
end

vm.args

## This file provide the arguments provided to the VM at startup
## You can find a full list of flags and their behaviours at
## http://erlang.org/doc/man/erl.html

## Name of the node
-name <%= release_name %>${SID}@${HOSTNAME}

## Cookie for distributed erlang
-setcookie <%= release.profile.cookie %>
## -setcookie ${ERLANG_COOKIE}


-smp auto

+c true
+C multi_time_warp

+zdbbl 81920

# max actor count in one erlang VM, a million should be enough
+P 1048576

ribbon.conf used in supervisor

[program:ribbon]
numprocs=2
numprocs_start=0
user=myuser
environment=SID=%(process_num)d
command=/data/apps/ribbon/bin/ribbon.sh
process_name=%(program_name)s_%(process_num)d
directory=/data/apps/ribbon
autostart=false
autorestart=false
startretries=0
stderr_logfile=/data/logs/supervisor/ribbon/ribbon-stderr.log
stderr_logfile_maxbytes=100MB
stderr_logfile_backups=2
stdout_logfile=/data/logs/supervisor/ribbon/ribbon-stdout.log
stdout_logfile_maxbytes=100MB
stdout_logfile_backups=20

/data/apps/ribbon/bin/ribbon.sh

#!/bin/bash

host_local_ip=`curl -s http://169.254.169.254/latest/meta-data/local-ipv4`
export REPLACE_OS_VARS=true
export HOSTNAME=${host_local_ip}
export PORT=40000
export MYSQL_USER=root
export MYSQL_DATABASE=test
export PROG=/data/apps/ribbon/bin/ribbon

exec $PROG foreground

[suexcxine]

Seems that distillery will change this:

## Name of the node
-name <%= release_name %>${SID}@${HOSTNAME}

to this

## Name of the node
-name ribbon1@10.52.3.41

and backup files are involved,
so two processes lead to conflict

[suexcxine]

I think this won't happen in docker container
Or we can use different release directories to walkaround this

Do we have other options ?