supervisord.conf

[unix_http_server]
file=/tmp/supervisor.sock   ; (the path to the socket file)

[supervisord]
user=root
logfile=/tmp/supervisord.log ; (main log file;default $CWD/supervisord.log)
logfile_maxbytes=50MB        ; (max main logfile bytes b4 rotation;default 50MB)
logfile_backups=10           ; (num of main logfile rotation backups;default 10)
loglevel=info                ; (log level;default info; others: debug,warn,trace)
pidfile=/tmp/supervisord.pid ; (supervisord pidfile;default supervisord.pid)
nodaemon=true               ; (start in foreground if true;default false)
minfds=1024                  ; (min. avail startup file descriptors;default 1024)
minprocs=200                 ; (min. avail process descriptors;default 200)

; the below section must remain in the config file for RPC
; (supervisorctl/web interface) to work, additional interfaces may be
; added by defining them in separate rpcinterface: sections
[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface

[supervisorctl]
serverurl=unix:///tmp/supervisor.sock ; use a unix:// URL  for a unix socket

[program:exporter]
command=prometheus-apache-exporter
redirect_stderr=true

[program:httpd]
command=/bin/bash -c 'if [ -f /var/run/apache2/apache2.pid ]; then rm /var/run/apache2/apache2.pid; fi && /usr/sbin/apache2ctl -D "FOREGROUND" -k start'
redirect_stderr=true