Redis permission denied while opening dump.rdb

I am using official redis image with sidekiq on dockers.

Following are yml configurations for redis image:

redis:  build: .  dockerfile: Dockerfile-redis  ports:    - '6379:6379'  volumes:    - 'redis:/var/lib/redis'sidekiq:  build: .  command: bundle exec sidekiq  links:    - db    - redis  volumes:    - .:/app  env_file:    - .env

Following is the code of my Dockerfile-redis:

FROM redisCOPY redis.conf /usr/local/etc/redis/redis.confCMD [ "redis-server", "/usr/local/etc/redis/redis.conf" ]

When I build the images everything works fine but after sometime docker-compose logs shows the following permission error:

redis_1          | 98:C 22 Jan 2019 18:40:10.098 # Failed opening the RDB file dump.rdb (in server root dir /var/lib/redis) for saving: Permission deniedredis_1          | 1:M 22 Jan 2019 18:40:10.203 # Background saving error

I have tried many solutions but I am still getting this error in logs. Everytime permission is denied for redis to open dump.rdb file. I have also followed this solution and done follwoing changes in my Dockerfile-redis to give root permission to redis

USER rootCMD chown -R root:root /var/lib/redis/CMD chown 777 /var/lib/redis/CMD chown 777 /var/lib/redis/dump.rdb

I have tried 755 for dir and 644 for dbfilename but it didn't worked for me. I also tried the above configurations of Dockerfile-redis with redis user but still I am getting the same permission denied error for opening dump.rdb file.

I don't know what I am doing wrong here. Please help me with this