location /ratechecker {
          default_type 'text/plain';
          content_by_lua_block {
            local redis_client = redis_cluster:new(config)
            local rate, err = redis_rate.measure(redis_client, ngx.var.arg_token)
            if err then
              ngx.log(ngx.ERR, "err: ", err)
              ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
            end
            if rate > 10 then
              ngx.exit(ngx.HTTP_FORBIDDEN)
            end
            ngx.say(rate)
          }
        }

019/05/29 16:42:34 [error] 10383#10383: *26 lua entry thread aborted: runtime error: /usr/local/openresty/lualib/resty-redis-cluster.lua:506: attempt to index local 'slot_item' (a nil value)
stack traceback:
coroutine 0:
        /usr/local/openresty/lualib/resty-redis-cluster.lua: in function 'commit_pipeline'
        /usr/local/openresty/lualib/resty-redis-rate.lua:19: in function 'measure'
        content_by_lua(nginx.conf:160):3: in main chunk, client: 10.51.21.110, server: foo.de, request: "GET /ratechecker?token=foo HTTP/1.1", host: "foo.de:8111"

        _reqs[i].origin_index = i
        local key = _reqs[i].key
        local slot = redis_slot(tostring(key))
        local slot_item = slots[slot]

        local ip, port, slave, err = pick_node(self, slot_item.serv_list, slot, magicRandomPickupSeed)

        ngx.say("ok " .. slot .. " ok " .. key)
        ngx.exit(200)

❯  make up
docker-compose down -v
WARNING: The COVERALLS_REPO_TOKEN variable is not set. Defaulting to a blank string.
WARNING: The TRAVIS_JOB_ID variable is not set. Defaulting to a blank string.
WARNING: The TRAVIS_BRANCH variable is not set. Defaulting to a blank string.
WARNING: The TRAVIS_REPO_SLUG variable is not set. Defaulting to a blank string.
Stopping nginx-lua-redis-rate-measuring_redis_cluster_1 ... done
Removing nginx-lua-redis-rate-measuring_nginx_1         ... done
Removing nginx-lua-redis-rate-measuring_redis_cluster_1 ... done
Removing network nginx-lua-redis-rate-measuring_default
docker-compose up nginx
WARNING: The COVERALLS_REPO_TOKEN variable is not set. Defaulting to a blank string.
WARNING: The TRAVIS_JOB_ID variable is not set. Defaulting to a blank string.
WARNING: The TRAVIS_BRANCH variable is not set. Defaulting to a blank string.
WARNING: The TRAVIS_REPO_SLUG variable is not set. Defaulting to a blank string.
Creating network "nginx-lua-redis-rate-measuring_default" with the default driver
Creating nginx-lua-redis-rate-measuring_redis_cluster_1 ... done
Creating nginx-lua-redis-rate-measuring_nginx_1         ... done
Attaching to nginx-lua-redis-rate-measuring_nginx_1
nginx_1          | 2019/08/02 17:10:23 [error] 1#1: lua_load_resty_core failed to load the resty.core module from https://github.com/openresty/lua-resty-core; ensure you are using an OpenResty release from https://openresty.org/en/download.html (rc: 2, reason: module 'resty.core' not found:
nginx_1          | 	no field package.preload['resty.core']
nginx_1          | 	no file '/usr/local/openresty/luajit/share/lua/5.1/resty/core.lua'
nginx_1          | 	no file '/lua/src/resty/core.lua'
nginx_1          | 	no file '/usr/local/openresty/luajit/lib/lua/5.1/resty/core.so'
nginx_1          | 	no file '/usr/local/openresty/luajit/lib/lua/5.1/resty.so')
nginx_1          | nginx: [error] lua_load_resty_core failed to load the resty.core module from https://github.com/openresty/lua-resty-core; ensure you are using an OpenResty release from https://openresty.org/en/download.html (rc: 2, reason: module 'resty.core' not found:
nginx_1          | 	no field package.preload['resty.core']
nginx_1          | 	no file '/usr/local/openresty/luajit/share/lua/5.1/resty/core.lua'
nginx_1          | 	no file '/lua/src/resty/core.lua'
nginx_1          | 	no file '/usr/local/openresty/luajit/lib/lua/5.1/resty/core.so'
nginx_1          | 	no file '/usr/local/openresty/luajit/lib/lua/5.1/resty.so')
nginx_1          | 2019/08/02 17:10:23 [error] 1#1: init_by_lua error: /usr/local/openresty/luajit/share/lua/5.1/resty/lock.lua:4: module 'resty.core.shdict' not found:
nginx_1          | 	no field package.preload['resty.core.shdict']
nginx_1          | 	no file '/usr/local/openresty/luajit/share/lua/5.1/resty/core/shdict.lua'
nginx_1          | 	no file '/lua/src/resty/core/shdict.lua'
nginx_1          | 	no file '/usr/local/openresty/luajit/lib/lua/5.1/resty/core/shdict.so'
nginx_1          | 	no file '/usr/local/openresty/luajit/lib/lua/5.1/resty.so'
nginx_1          | stack traceback:
nginx_1          | 	[C]: in function 'require'
nginx_1          | 	/usr/local/openresty/luajit/share/lua/5.1/resty/lock.lua:4: in main chunk
nginx_1          | 	[C]: in function 'require'
nginx_1          | 	...l/openresty/luajit/share/lua/5.1/resty-redis-cluster.lua:3: in main chunk
nginx_1          | 	[C]: in function 'require'
nginx_1          | 	init_by_lua:13: in main chunk
nginx-lua-redis-rate-measuring_nginx_1 exited with code 1

version: '3'
services:
  nginx-web:
    build:
      context: .
    labels:
        com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy: "true"
    container_name: ${NGINX_WEB:-nginx-web}
    restart: always
    ports:
      - "${IP:-0.0.0.0}:${DOCKER_HTTP:-80}:80"
      - "${IP:-0.0.0.0}:${DOCKER_HTTPS:-443}:443"
    volumes:
      - ${NGINX_FILES_PATH:-./data}/conf.d:/etc/nginx/conf.d
      - ${NGINX_FILES_PATH:-./data}/vhost.d:/usr/local/openresty/nginx/vhost.d
      - ${NGINX_FILES_PATH:-./data}/html:/usr/share/nginx/html
      - ${NGINX_FILES_PATH:-./data}/certs:/usr/local/openresty/nginx/certs:ro
      - ${NGINX_FILES_PATH:-./data}/htpasswd:/usr/local/openresty/nginx/htpasswd:ro
      - ./nginx.conf:/usr/local/openresty/nginx/conf/nginx.conf
      - ./lua:/lua/src
    logging:
      driver: ${NGINX_WEB_LOG_DRIVER:-json-file}
      options:
        max-size: ${NGINX_WEB_LOG_MAX_SIZE:-4m}
        max-file: ${NGINX_WEB_LOG_MAX_FILE:-10}
    depends_on:
      - redis_cluster
    links:
      - redis_cluster

  nginx-gen:
    image: jwilder/docker-gen
    command: -notify-sighup ${NGINX_WEB:-nginx-web} -watch -wait 5s:30s /etc/docker-gen/templates/nginx.tmpl /etc/nginx/conf.d/default.conf
    container_name: ${DOCKER_GEN:-nginx-gen}
    restart: always
    environment:
      SSL_POLICY: ${SSL_POLICY:-Mozilla-Intermediate}
    volumes:
      - ${NGINX_FILES_PATH:-./data}/conf.d:/etc/nginx/conf.d
      - ${NGINX_FILES_PATH:-./data}/vhost.d:/etc/nginx/vhost.d
      - ${NGINX_FILES_PATH:-./data}/html:/usr/share/nginx/html
      - ${NGINX_FILES_PATH:-./data}/certs:/etc/nginx/certs:ro
      - ${NGINX_FILES_PATH:-./data}/htpasswd:/etc/nginx/htpasswd:ro
      - /var/run/docker.sock:/tmp/docker.sock:ro
      - ./nginx.tmpl:/etc/docker-gen/templates/nginx.tmpl:ro
    logging:
      driver: ${NGINX_GEN_LOG_DRIVER:-json-file}
      options:
        max-size: ${NGINX_GEN_LOG_MAX_SIZE:-2m}
        max-file: ${NGINX_GEN_LOG_MAX_FILE:-10}