CODEWITHSUNDEEP
pythonsupervisord
Abe Voelker
Abe Voelker

Reputation: 31622

How do set an environment variable while referencing an existing environment variable in supervisord config?

I'm trying to set an environment variable in my supervisord config by using the value of an existing environment variable. The existing variable is REDIS_PORT_6379_TCP_ADDR (comes from a Docker linked container); the value is an IP address (e.g. 172.17.0.5). This was my first naive attempt:

[program:sidekiq]
user=web
directory=/var/www
environment=REDIS_URL=redis://$REDIS_PORT_6379_TCP_ADDR:6379/0
command=bundle exec sidekiq -c 50
redirect_stderr=true
autorestart=true

Which doesn't work at all as supervisord can't parse it:

$ supervisord -c /etc/supervisor/supervisord.conf -n
Error: Unexpected end of key/value pairs
For help, use /usr/bin/supervisord -h

Then I tried quoting the environment section:

environment=REDIS_URL="redis://$REDIS_PORT_6379_TCP_ADDR:6379/0"

That didn't work as the variable didn't get interpolated before being passed to my program:

2014-06-16T03:08:35Z 240 TID-oqy09ga9c WARN: the scheme redis does not accept registry part: $REDIS_PORT_6379_TCP_ADDR:6379 (or bad hostname?)

Then, per this answer, I tried using the %(ENV) syntax:

environment=REDIS_URL="redis://%(ENV_REDIS_PORT_6379_TCP_ADDR):6379/0"

Once again it can't parse it:

$ supervisord -c /etc/supervisor/supervisord.conf -n                              
Error: Format string 'REDIS_URL="redis://%(ENV_REDIS_PORT_6379_TCP_ADDR):6379/0"' for 'environment' is badly formatted
For help, use /usr/bin/supervisord -h

Same result if I remove the double quotes:

$ supervisord -c /etc/supervisor/supervisord.conf -n
Error: Format string 'REDIS_URL=redis://%(ENV_REDIS_PORT_6379_TCP_ADDR):6379/0' for 'environment' is badly formatted
For help, use /usr/bin/supervisord -h

I've tried the same things by putting export into the command section:

[program:sidekiq]
user=web
directory=/var/www
command="export REDIS_URL=redis://$REDIS_PORT_6379_TCP_ADDR:6379/0; bundle exec sidekiq -c 50"
redirect_stderr=true
autorestart=true

Result:

$ supervisord -c /etc/supervisor/supervisord.conf -n
2014-06-16 03:35:00,170 WARN Included extra file "/etc/supervisor/conf.d/sidekiq.conf" during parsing
2014-06-16 03:35:00,193 INFO RPC interface 'supervisor' initialized
2014-06-16 03:35:00,194 INFO supervisord started with pid 346
2014-06-16 03:35:01,197 INFO spawnerr: can't find command 'export REDIS_URL=redis://$REDIS_PORT_6379_TCP_ADDR:6379/0; bundle exec sidekiq -c 50'

Again:

[program:sidekiq]
user=web
directory=/var/www
command="export REDIS_URL=redis://%(ENV_REDIS_PORT_6379_TCP_ADDR):6379/0; bundle exec sidekiq -c 50"
redirect_stderr=true
autorestart=true

Result:

$ supervisord -c /etc/supervisor/supervisord.conf -n                              
Error: Format string '"export REDIS_URL=redis://%(ENV_REDIS_PORT_6379_TCP_ADDR):6379/0; bundle exec sidekiq -c 50"' for 'command' is badly formatted
For help, use /usr/bin/supervisord -h

What am I doing wrong?

edit:

$supervisord --version
3.0b2

Upvotes: 3

Views: 1967

Answers (1)

Abe Voelker
Abe Voelker

Reputation: 31622

Turns out the problem was that I wasn't familiar enough with Python's string formatting syntax. I needed to add an s at the end of the %() to set the format type to string.

Final config:

[program:sidekiq]
user=web
directory=/var/www
environment=REDIS_URL=redis://%(ENV_REDIS_PORT_6379_TCP_ADDR)s:6379/0
command=bundle exec sidekiq -c 50
redirect_stderr=true
autorestart=true

Upvotes: 4

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