attempting to recreate supervisor tutorial in docker, running into error (permissioning?)

Question

I'm attempting to recreate the steps in this tutorial in a docker context, ubuntu image installed under coreos running in virtualbox on OS X.

I've set up a Dockerfile that has the following steps:

# Install docker basics
RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
RUN apt-get update
RUN apt-get upgrade -y

# Install supervisor
RUN apt-get install -y supervisor
RUN mkdir -p /var/run/sshd
RUN mkdir -p /var/log/supervisor
RUN mkdir -p /etc/supervisor/conf.d

# tutorial suite
ADD ./etc/long.sh /usr/local/bin/long.sh
RUN /bin/chmod 0777 /usr/local/bin/long.sh
ADD ./etc/long_script.conf /etc/supervisor/conf.d/long_script.conf

# create supervisord user
RUN /usr/sbin/useradd --create-home --home-dir /usr/local/nonroot --shell /bin/bash nonroot

# start supervisord
RUN sudo service supervisor start

which copies the following files out of a relative /etc/ directory:

long.sh:

#!/bin/bash
while true
do
    # Echo current date to stdout
    echo `date`
    # Echo 'error!' to stderr
    echo 'error!' >&2
    sleep 1
done

and long_script.conf:

[program:long_script]
command=/usr/local/bin/long.sh
autostart=true
autorestart=true
stderr_logfile=/var/log/long.err.log
stdout_logfile=/var/log/long.out.log

It loads everything correctly, but then there is no corresponding output in either /var/log/long.out.log or /var/log/long.err.log, although both files are present in that directory.

When I load the image with /bin/bash/, I then try the following:

1. I can successfully run service supervisor restart and get Restarting supervisor: as output.

2. But when I try to run any functions with supervisorctl, I get errors, i.e. unix:///var/run/supervisor.sock refused connection

I checked the output of /var/log/supervisor/supervisord.log and it gives me:

2014-03-17 08:54:48,090 CRIT Supervisor running as root (no user in config file)
2014-03-17 08:54:48,090 WARN Included extra file "/etc/supervisor/conf.d/long_script.conf" during parsing
2014-03-17 08:54:48,161 INFO RPC interface 'supervisor' initialized
2014-03-17 08:54:48,161 WARN cElementTree not installed, using slower XML parser for XML-RPC
2014-03-17 08:54:48,161 CRIT Server 'unix_http_server' running without any HTTP authentication checking
2014-03-17 08:54:48,163 INFO daemonizing the supervisord process
2014-03-17 08:54:48,164 INFO supervisord started with pid 10
2014-03-17 08:54:49,165 INFO spawned: 'long_script' with pid 13
[error] client.go:2296 Error resize: Error: resize: bad file descriptor

Googling suggests that I include a barebones supervisord.conf file that explicitly points the application to the supervisord.sock file, so I added the following to the Dockerfile:

# Add supervisor config file
ADD ./etc/supervisord.conf /etc/supervisor/conf.d/supervisord.conf

and then added a supervisord.conf file that looks like this:

[supervisord]
logfile=/var/log/supervisor/supervisord.log
loglevel=error
nodaemon=false

[supervisorctl]
serverurl = unix:///var/run/supervisord.sock

After including this

1. I no longer have either long.err.log or long.out.log populating in /var/log/ at all.
2. I am able to run service supervisor restart, but now when I run supervisorctl, the error I get is changed to unix:///var/run/supervisord.sock no such file.

I checked the output of /var/log/supervisor/supervisord.log and it gives me:

2014-03-17 08:48:29,715 CRIT Supervisor running as root (no user in config file)[error] client.go:2296 Error resize: Error: resize: bad file descriptor

Thinking that this might be a user permissioning issue, I tried switching the supervisord.conf file to

[supervisord]
logfile=/var/log/supervisor/supervisord.log
loglevel=error
nodaemon=false
user=nonroot

[supervisorctl]
serverurl = unix:///var/run/supervisord.sock

after adding the following to my Dockerfile

RUN /usr/sbin/useradd --create-home --home-dir /usr/local/nonroot --shell /bin/bash nonroot

but that gets me the following error on compile

Step XX : RUN service supervisor start
 ---> Running in fdcb12ff3cfa
Traceback (most recent call last):
  File "/usr/bin/supervisord", line 9, in <module>
load_entry_point('supervisor==3.0a8', 'console_scripts', 'supervisord')()
  File "/usr/lib/pymodules/python2.7/supervisor/supervisord.py", line 371, in main
go(options)
  File "/usr/lib/pymodules/python2.7/supervisor/supervisord.py", line 381, in go
d.main()
  File "/usr/lib/pymodules/python2.7/supervisor/supervisord.py", line 88, in main
info_messages)
  File "/usr/lib/pymodules/python2.7/supervisor/options.py", line 1231, in make_logger
stdout = self.nodaemon,
  File "/usr/lib/pymodules/python2.7/supervisor/loggers.py", line 325, in getLogger
handlers.append(RotatingFileHandler(filename,'a',maxbytes,backups))
  File "/usr/lib/pymodules/python2.7/supervisor/loggers.py", line 180, in __init__
FileHandler.__init__(self, filename, mode)
  File "/usr/lib/pymodules/python2.7/supervisor/loggers.py", line 106, in __init__
self.stream = open(filename, mode)

Logging into /bin/bash/ and doing a cat on /var/log/supervisor/supervisord.log now yields:

2014/03/17 08:57:36 build: The command [/bin/sh -c service supervisor start] returned a non-zero code: 1
2014-03-17 08:54:48,090 CRIT Supervisor running as root (no user in config file)
2014-03-17 08:54:48,090 WARN Included extra file "/etc/supervisor/conf.d/long_script.conf" during parsing
2014-03-17 08:54:48,161 INFO RPC interface 'supervisor' initialized
2014-03-17 08:54:48,161 WARN cElementTree not installed, using slower XML parser for XML-RPC
2014-03-17 08:54:48,161 CRIT Server 'unix_http_server' running without any HTTP authentication checking
2014-03-17 08:54:48,163 INFO daemonizing the supervisord process
2014-03-17 08:54:48,164 INFO supervisord started with pid 10
2014-03-17 08:54:49,165 INFO spawned: 'long_script' with pid 13
[error] client.go:2296 Error resize: Error: resize: bad file descriptor

What is the issue here? I just want to be able to run this shell script via supervisord and observe its output in the log files.

Answer 1

You are also starting the service - but then not leaving it to run.

RUN sudo service supervisor start

You should probably be running it directly:

CMD ["/usr/bin/supervisord"]

You may also have to/need to add some parameters to that CMD. See: Docker/Supervisord example