Run server with custom config

[ivanovaleksey]

Hello,
I try to run redis server with a custom config via docker compose.

I got the following docker-compose.yml file:

version: '3'
services:
  web:
    build: .
    command: bundle exec puma -C config/puma.rb
    volumes:
      - ./log:/app/log
      - ./tmp:/app/tmp
    ports:
      - 9292:9292
    environment:
      - RACK_ENV=production
      - REDIS_URL=redis://redis:6379
    depends_on:
      - redis
  redis:
    image: redis:alpine
    volumes:
      - ./config/redis/redis.conf:/usr/local/etc/redis/redis.conf
    command:
      - redis-server /usr/local/etc/redis/redis.conf

Unfortunately, I got an error:

$ docker-compose up
redis_1  | 1:C 04 Feb 21:06:51.504 # Fatal error, can't open config file 'redis-server /usr/local/etc/redis/redis.conf'
redis_1 exited with code 1
web_1    | Puma starting in single mode...
web_1    | * Version 3.11.2 (ruby 2.5.0-p0), codename: Love Song
web_1    | * Min threads: 1, max threads: 1
web_1    | * Environment: production
web_1    | * Listening on tcp://0.0.0.0:9292
web_1    | Use Ctrl-C to stop

However, the file does exist. I can run redis service and see it
$ docker-compose run redis /bin/sh

$ ls -lt /usr/local/etc/redis/redis.conf
-rw-rw-r--    1 1000     1000         57845 Feb  4 20:43 /usr/local/etc/redis/redis.conf

It is strange to me that user and group is 1000.
Maybe it causes the issue?
Could you please help to figure it out?

[yosifkit]

The ownership of the file would be the cause of the problem (or possibly folder permissions, since /usr/local/etc/ does not exist and would be created by Docker in making the mount). You have a few options, run the container as your user (user: '1000:1000' in your yaml file) which can work because of #48, or maybe putting the file in a different location in the container would help.

[ivanovaleksey]

Thank you for the reply @yosifkit.
I have tried /usr/local/redis.conf and /etc/redis.conf.
Now it is

-rw-r--r--    1 1000     50           57845 Feb  4 20:41 redis.conf

Where do these ids came from? Why it isn't root or redis?

[tianon]

Usernames are an abstraction -- the filesystem deals in raw UIDs, so as far as the kernel is concerned, root and redis don't mean anything. Those name conversions come from a file located at /etc/passwd, which is different on your Docker host system from the one inside the container, which is likely part of the issue you're seeing. If you don't supply --user or user: when running the redis image, it will step down from root by itself:

https://github.com/docker-library/redis/blob/d53b982b387634092c6f11069401679034054ecb/4.0/docker-entrypoint.sh#L10-L14

As for why you're seeing those specific values, I'd imagine it probably has something to do with your docker-compose.yml or your host filesystem. It sounds like you're probably using Docker Toolbox with boot2docker (since boot2docker uses 1000:50 as the default user for the filesystem share into the Docker VM), but that's just a guess.

Since this isn't really an issue with the image, and is more of a question about usage, I'm going to close.
In the future, these sorts of questions/requests would be more appropriately posted to the Docker Community Forums, the Docker Community Slack, or Stack Overflow. Thanks!

[ivanovaleksey]

Thanks, I will try to investigate further.

[ivanovaleksey]

@tianon @yosifkit
As it turned out one should command in the following way:

redis:
    image: redis:alpine
    volumes:
      - ./config/redis/redis.conf:/usr/local/etc/redis/redis.conf
    command:
      - /usr/local/etc/redis/redis.conf

This way docker-entrypoint.sh works fine and rewrite the whole command to

# set -- redis-server "$@"
redis-server /usr/local/etc/redis/redis.conf

In my first message I got error

can't open config file 'redis-server /usr/local/etc/redis/redis.conf'

So, the whole command was interpreted as file name.

Now config file was read but I got another error:

redis_1  | *** FATAL CONFIG FILE ERROR ***
redis_1  | Reading the configuration file, at line 172
redis_1  | >>> 'logfile /var/log/redis_6379.log'
redis_1  | Can't open the log file: Permission denied

P.S.
I have changed logfile /var/log/redis_6379.log to logfile /data/redis_6379.log but the file remains the same. Looks like it was cached somehow thought I have cleared volumes.

[wolfpack94]

Any update on this error?

[yosifkit]

@wolfpack94, to what error are you referring? The original issue was that the yaml was wrongly configured.

# it was this
    command:
      - redis-server /usr/local/etc/redis/redis.conf

# when it should've been this
    command:
      - redis-server
      - /usr/local/etc/redis/redis.conf

# or this
    command:
      - /usr/local/etc/redis/redis.conf

[phpguru]

Make sure to use daemonize no in your custom config. Redis is automagically daemonized by the Docker entry_point.sh

Changing daemonize from yes to no worked fine for me.

[bmy4415]

@phpguru has exactly same with my situation.
When I use daemonize yes in my redis.conf file, redis container terminate right after startup.
Even this does not show helpful logs.

$ docker logs -ft redis
2020-05-22T07:06:33.532775512Z 1:C 22 May 2020 07:06:33.532 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
2020-05-22T07:06:33.532815657Z 1:C 22 May 2020 07:06:33.532 # Redis version=6.0.3, bits=64, commit=00000000, modified=0, pid=1, just started
2020-05-22T07:06:33.532822149Z 1:C 22 May 2020 07:06:33.532 # Configuration loaded

# end of log