Permission issues

When running nginx-vhosts I run into permission issues:

{ [Error: Command failed: /bin/sh -c nginx -s reload
nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied)
2015/06/18 20:49:20 [notice] 20500#0: signal process started
2015/06/18 20:49:20 [alert] 20500#0: kill(11831, 1) failed (1: Operation not permitted)
]
  killed: false,
  code: 1,
  signal: null,
  cmd: '/bin/sh -c nginx -s reload' } '' 'nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied)\n2015/06/18 20:49:20 [notice] 20500#0: signal process started\n2015/06/18 20:49:20 [alert] 20500#0: kill(11831, 1) failed (1: Operation not permitted)\n'

I had the same problem writing to the conf.d folder

first problem: write access to /etc/nginx/conf.d/
{ [Error: EACCES, open '/etc/nginx/conf.d/test.conf']
  errno: -13,
  code: 'EACCES',
  path: '/etc/nginx/conf.d/test.conf' } undefined undefined

but I temporarily solved this by chmodding it to 777. This could also be my lack of knowledge on how to provide Nodejs with sudo capabilities, but how can I run nginx-vhost without running into these issues?

Reproduce the reported failures from the nginx-vhosts command, including nginx -s reload and writing to /etc/nginx/conf.d/. Inspect how the tool invokes nginx and writes configuration files, then define completion as handling the reported permission failures without relying on chmod 777.