Question

我有以下 docker-compose.yml 文件，用 postgresql 运行 kong 。我也在那里进行了迁移，我现在已经删除了。想知道为什么它会抛出postgresql的连接问题。

postgresql容器已启动并正在运行。
问题在于kong

这是我的docker-compose.yml：

version: '3.2'
networks:
  kong-net:

services:

  kong-database:
    image: postgres:9.5
    container_name: kong-database
    networks:
      - kong-net
    ports:
      - 5435:5435
    environment:
      - POSTGRES_DB=kong
      - POSTGRES_USER=kong
      - POSTGRES_PASSWORD=password

  kong:
    image: kong:latest
    restart: always
    networks:
      - kong-net
    depends_on:
      - kong-database
    ports:
      - 8000:8000
      - 8443:8443
      - 8009:8009
      - 7947:7947
      - 7947:7947/udp
    environment:
      - KONG_DATABASE=postgres
      - KONG_PG_HOST=kong-database
      - KONG_PG_PASSWORD=password
      - KONG_ADMIN_LISTEN=0.0.0.0:8009

我正在更换kong的端口，因为其他服务已经存在在8001端口运行

以下是docker-compose logs

的错误日志

日志：

Attaching to kong_kong_1, kong-database
kong-database    | The files belonging to this database system will be owned by user "postgres".
kong-database    | This user must also own the server process.
kong-database    | 
kong-database    | The database cluster will be initialized with locale "en_US.utf8".
kong-database    | The default database encoding has accordingly been set to "UTF8".
kong-database    | The default text search configuration will be set to "english".
kong-database    | 
kong-database    | Data page checksums are disabled.
kong-database    | 
kong-database    | fixing permissions on existing directory /var/lib/postgresql/data ... ok
kong-database    | creating subdirectories ... ok
kong-database    | selecting default max_connections ... 100
kong-database    | selecting default shared_buffers ... 128MB
kong-database    | selecting dynamic shared memory implementation ... posix
kong-database    | creating configuration files ... ok
kong-database    | creating template1 database in /var/lib/postgresql/data/base/1 ... ok
kong-database    | initializing pg_authid ... ok
kong-database    | initializing dependencies ... ok
kong-database    | creating system views ... ok
kong-database    | loading system objects' descriptions ... ok
kong-database    | creating collations ... ok
kong-database    | creating conversions ... ok
kong-database    | creating dictionaries ... ok
kong-database    | setting privileges on built-in objects ... ok
kong-database    | creating information schema ... ok
kong-database    | loading PL/pgSQL server-side language ... ok
kong-database    | vacuuming database template1 ... ok
kong-database    | copying template1 to template0 ... ok
kong-database    | copying template1 to postgres ... ok
kong_1           | prefix directory /usr/local/kong not found, trying to create it
kong_1           | nginx: [error] init_by_lua error: /usr/local/share/lua/5.1/kong/init.lua:169: [postgres error] could not retrieve server_version: connection refused
kong_1           | stack traceback:
kong_1           |  [C]: in function 'error'
kong_1           |  /usr/local/share/lua/5.1/kong/init.lua:169: in function 'init'
kong_1           |  init_by_lua:3: in main chunk
kong_1           | nginx: [error] init_by_lua error: /usr/local/share/lua/5.1/kong/init.lua:169: [postgres error] could not retrieve server_version: connection refused
kong_1           | stack traceback:
kong_1           |  [C]: in function 'error'
kong_1           |  /usr/local/share/lua/5.1/kong/init.lua:169: in function 'init'
kong_1           |  init_by_lua:3: in main chunk

Answer 1

您的第一个问题是kong容器在kong-database容器完成初始化过程之前启动。这是＆＃34;连接被拒绝的来源＆＃34;错误。您可以通过首先启动数据库来验证这一点：

docker-compose up kong-database

然后等到你看到：

PostgreSQL init process complete; ready for start up.

然后在另一个窗口中，启动kong容器：

docker-compose up kong

你会看到一个新错误：

kong_1           | nginx: [warn] [lua] log.lua:63: log(): postgres
  database 'kong' is missing migration: (response-transformer)
  2016-05-04-160000_resp_trans_schema_changes
kong_1           | nginx: [error] init_by_lua error:
  /usr/local/share/lua/5.1/kong/init.lua:172: [postgres error] the
  current database schema does not match this version of Kong.
  Please run `kong migrations up` to update/initialize the database
  schema. Be aware that Kong migrations should only run from a
  single node, and that nodes running migrations concurrently will
  conflict with each other and might corrupt your database schema!

这表明kong已成功连接到postgres，但是看起来你需要运行某种数据库模式初始化之前它将起作用。

这种启动依赖的典型解决方案是实现数据库客户端启动时的等待循环，直到循环数据库可用。类似的东西：

while ! psql -h kong-database -U kong -c 'select 1'; do
  sleep 1
done

无法启动用docker-compose编写的kong服务

1 个答案: