JavaScript plugin server connection error in Docker

Questions
1

I’m trying to build a custom plugin using the JavaScript PDK using Docker/docker-compose, but I’m having an issue getting started. The error I’m getting is

[crit] 1221#0: *3001 connect() to unix:/usr/local/kong/js_pluginserver.sock failed (2: No such file or directory), context: ngx.timer

I’m wondering is there any command I need to execute to initialize the plugin server?

For context, here is my Dockerfile and docker-compose.yml

Dockerfile

FROM kong:3.2.2

USER root
COPY ./kong/plugins /usr/local/kong/js-plugins
COPY --from=node:14.17.6 /usr/local/bin /usr/local/bin
COPY --from=node:14.17.6 /usr/local/lib/node_modules /usr/local/lib/node_modules
RUN npm install --unsafe -g kong-pdk@0.5.5

USER kong

docker-compose.yml

networks:
  kong-net:
  
services:

  #######################################
  # Postgres: The database used by Kong
  #######################################
  kong-database:
    image: postgres:14.1
    container_name: kong-db
    environment:
      POSTGRES_DB: kong
      POSTGRES_USER: kong
      POSTGRES_PASSWORD: kong
    networks:
      - kong-net
    healthcheck:
      test: ["CMD", "pg_isready", "-U", "kong"]
      interval: 10s
      timeout: 5s
      retries: 5
    restart: on-failure

  #######################################
  # Kong database migration
  #######################################
  kong-migrations:
    build: .
    command: kong migrations bootstrap && kong migrations up && kong migrations finish
    container_name: kong-migrations
    depends_on:
      kong-database:
        condition: service_healthy
    environment:
      KONG_DATABASE: postgres
      KONG_PG_HOST: kong-db
      KONG_PG_USER: kong
      KONG_PG_PASSWORD: kong
      KONG_PG_DATABASE: kong
    networks:
      - kong-net
    restart: on-failure

  #######################################
  # Kong: The API Gateway
  #######################################
  kong-api:
    build: .
    container_name: kong-api
    depends_on:
      kong-database:
        condition: service_healthy
    volumes:
      - ./kong/plugins:/usr/local/kong/js-plugins
    environment:
      KONG_DATABASE: postgres
      KONG_PG_HOST: kong-db
      KONG_PG_USER: kong
      KONG_PG_PASSWORD: kong
      KONG_PG_DATABASE: kong
      KONG_ADMIN_LISTEN: 0.0.0.0:8001
      KONG_PLUGINSERVER_NAMES: js
      KONG_PLUGINSERVER_JS_SOCKET: /usr/local/kong/js_pluginserver.sock
      KONG_PLUGINSERVER_JS_START_CMD: /usr/local/bin/kong-js-pluginserver -v --plugins-directory /usr/local/kong/js-plugins 
      KONG_PLUGINSERVER_JS_QUERY_CMD: /usr/local/bin/kong-js-pluginserver --plugins-directory /usr/local/kong/js-plugins --dump-all-plugins 
      KONG_PLUGINS: bundled, hello
    networks:
      - kong-net
    ports:
      - "8000:8000"
      - "8001:8001"
    healthcheck:
      test: ["CMD", "kong", "health"]
      interval: 10s
      timeout: 10s
      retries: 1
    restart: on-failure

Any suggestions for things to try would be much appreciated. Thank you!

2

Following up on this in case anyone else is hitting the same issue. It appears to be related to the bug in Kong 3.2 described in this github issue: Missing plugin socket · Issue #308 · Kong/kong-js-pdk (github.com)

In light of this, we decided to switch to using Lua for custom plugins instead of JavaScript as it seems more stable and better supported.