Monit / init.d for Elixir/Phoenix and Spinx/searchd on Ubuntu

Question

I am trying to get Monit / init.d scripts running on a few different servers, and for a few different processes on Ubuntu servers.

Trying to get Sphinx to start on reboot, and to work with Monit
Trying to get Elixir/Phoenix mix phx.server to start on reboot and work with Monit

When I run monit -t I see no errors

For elixir:

When logged in as deploy user role, I manually run ./etc/init.d elixir start – the process starts just fine
When logged in as deploy user role I manually run sudo monit start elxir but nothing happens...
When I reboot the machine the application is not started
I am attempting to log result of the init.d script, but I see no output

For searchd:

When logged in as deploy user role, I manually run ./etc/init.d sphinx start – the process starts just fine
When logged in as deploy user role I manually run sudo monit start sphinx but nothing happens...
When I reboot the machine the application is not started
I am attempting to log result of the init.d script, but I see no output
The init.d scripts are executable
I’ve tried this command which I read may ensure that the script is registered to run on reboot: sudo update-rc.d start_sphinx defaults

Example Elixir monit script:

example monit script:
check process api matching "mix phx.server"
start program = "/etc/init.d/elixir start" as uid deploy and gid deploy
stop program = "/etc/init.d/elixir stop" as uid deploy and gid deploy

Example Elixir init.d script:

#!/bin/bash
# chkconfig: 2345 20 80
# description: Elixir API

# Source function library.
#. /etc/init.d/functions

start() {
    cd /home/deploy/apps/api && PORT=8888 MIX_ENV=prod elixir --erl "-detached" -S mix phx.server > /home/deploy/elixir_init_d_start.log 2>&1
}

stop() {
  pkill -f 'mix phx.server'
}

case "$1" in
    start)
       start
       ;;
    stop)
       stop
       ;;
    restart)
       stop
       start
       ;;
    status)
       # code to check status of app comes here
       # example: status program_name
       ;;
    *)
       echo "Usage: $0 {start|stop|status|restart}"
esac

exit 0

Does the leading dot in “I manually run `./etc/init.d elixir start`” means you run a custom `init.d` located somewhere in a custom folder? Also, normally you’d run `start service` to start services. — Aleksei Matiushkin, Oct 07 '22 at 06:46
To add more context, one of the servers in question is Ubuntu 14 — Gordon Isnor, Oct 07 '22 at 16:15
Do you try to start "elixir", then use "./elixir" to start the program. Remember, the monitor use an reduced environment, the used profile will not honored and the folder, the script switch to /home/deploy/apps/api, is not in the path. — lutzmad, Oct 11 '22 at 14:08

score 0 · Answer 1 · answered Oct 17 '22 at 01:50

I never did get the above script working with the existing setup, but what I did find that worked was this: I upgrade Phoenix from 1.3 to 1.6 and am now using Phoenix/Elixir releases.

My deploy process now looks like this:

git push server
{login to server}
cd apps
rm -rf api
mkdir api
cd api
git clone --shared ../new_deploy_method . 
cd config
vi prod.secret.exs
{copy local config/prod.secret.exs}
cd ../
mix deps.get --only prod
MIX_ENV=prod mix compile
mix phx.gen.release
MIX_ENV=prod mix release
_build/prod/rel/my_app/bin/my_app daemon

Now my init.d script looks like this:

#!/bin/bash
# chkconfig: 2345 20 80
# description: Elixir API

# Source function library.
#. /etc/init.d/functions

start() {
  /home/deploy/apps/api/_build/prod/rel/ckdu_site_api/bin/ckdu_site_api daemon > /home/deploy/elixir_init_d_start.log 2>&1
}

stop() {
  /home/deploy/apps/api/_build/prod/rel/ckdu_site_api/bin/ckdu_site_api stop > /home/deploy/elixir_init_d_start.log 2>&1
}

case "$1" in
    start)
       start
       ;;
    stop)
       stop
       ;;
    restart)
       stop
       start
       ;;
    status)
       # code to check status of app comes here
       # example: status program_name
       ;;
    *)
       echo "Usage: $0 {start|stop|status|restart}"
esac

exit 0

My monit script now looks like this:

check process api matching "beam"
start program = "/etc/init.d/elixir start" as uid deploy and gid deploy
stop program = "/etc/init.d/elixir stop" as uid deploy and gid deploy

Thanks to the folks who commented trying to help me out!

Monit / init.d for Elixir/Phoenix and Spinx/searchd on Ubuntu

1 Answers1