副本拒绝接受连接，尽管主副本工作得很好

问题描述 投票：0回答：1

我目前在 Docker Compose 中运行一个副本和一个主容器，并且 Compose 中的所有服务都连接到同一网络。

主要的保镖可以连接到主要，后端应用程序可以连接到保镖：

❯ psql -h db-bouncer -p 6432 -U $POSTGRES_USER $POSTGRES_DB
Password for user dev: 
psql (16.4)
Type "help" for help.
foo=# exit
>

副本的保镖无法连接到副本：

pgbouncer 19:25:57.97 INFO  ==> Waiting for PostgreSQL backend to be accessible
timeout reached before the port went into state "inuse"
timeout reached before the port went into state "inuse"
...
pgbouncer 19:32:38.13 ERROR ==> Backend db-replica not accessible

后端应用程序都不能：

❯ psql -h db-replica -p 5433 -U $POSTGRES_USER $POSTGRES_DB
psql: error: connection to server at "db-replica" (172.17.0.4), port 5433 failed: Connection refused
    Is the server running on that host and accepting TCP/IP connections?

最令人困惑的是，这里实际上没有任何错误迹象。 config 与primary 的字面意思相同。

复制品：

2024-09-24 19:26:04.317 GMT [32] LOG:  starting PostgreSQL 16.4 (Debian 16.4-1.pgdg120+1) on aarch64-unknown-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit
2024-09-24 19:26:04.317 GMT [32] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2024-09-24 19:26:04.317 GMT [32] LOG:  listening on IPv6 address "::", port 5432
2024-09-24 19:26:04.319 GMT [32] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2024-09-24 19:26:04.321 GMT [56] LOG:  database system was interrupted; last known up at 2024-09-24 19:26:03 GMT
2024-09-24 19:26:05.076 GMT [56] LOG:  entering standby mode
2024-09-24 19:26:05.076 GMT [56] LOG:  starting backup recovery with redo LSN 0/2000028, checkpoint LSN 0/2000060, on timeline ID 1
2024-09-24 19:26:05.078 GMT [56] LOG:  redo starts at 0/2000028
2024-09-24 19:26:05.078 GMT [56] LOG:  completed backup recovery with redo LSN 0/2000028 and end LSN 0/2000100
2024-09-24 19:26:05.078 GMT [56] LOG:  consistent recovery state reached at 0/2000100
2024-09-24 19:26:05.078 GMT [32] LOG:  database system is ready to accept read-only connections

与端口 

5432
工作正常。我已将 Compose 端口设置为 
5433:5432
。 
postgresql.conf
是一样的。 
pg_hba.conf
是一样的。端口配置相同，只是绑定到 
5433
而不是 
5432
。初始化脚本是相同的。副本实际上是主 Compose 服务的 1:1 克隆。我真的失去了理性思考的能力，这没有任何意义。

    db-replica:
        build:
          context: .
          dockerfile: db.replica.Dockerfile
        env_file:
          - '.env'
        ports:
            - ${POSTGRES_REPLICA_PORT:-5433}:5432
        volumes:
            - ./pg_hba.conf:/etc/postgresql/pg_hba.conf
            - ./postgresql.conf:/etc/postgresql/postgresql.conf
            - postgres_replica_data:/var/lib/postgresql/data/docker
        command: |
            bash -c "
                if [ -z \"$(ls -A /var/lib/postgresql/data/docker)\" ]; then
                  until pg_basebackup -h $POSTGRES_PRIMARY_HOST -U $POSTGRES_USER -p $POSTGRES_PRIMARY_PORT -D /var/lib/postgresql/data/docker -Fp -Xs -P -R -S slave
                  do
                    echo 'Waiting for primary to connect...'
                    sleep 1s
                  done
                  echo 'Backup done, starting replica...'
                  chmod 0700 /var/lib/postgresql/data
                  chmod 
                  bash /etc/postgresql/init-conf.sh
                else
                  echo 'Backup already exists, starting replica...'
                  bash /etc/postgresql/init-conf.sh
                fi
              "


init-conf.sh
什么也不做，它只是移动配置并启动服务器

#!/bin/bash
set -e
[[ -e /etc/postgresql/pg_hba.conf ]] && cp /etc/postgresql/pg_hba.conf /var/lib/postgresql/data/docker/pg_hba.conf
[[ -e /etc/postgresql/postgresql.conf ]] && cp /etc/postgresql/postgresql.conf /var/lib/postgresql/data/docker/postgresql.conf
bash docker-entrypoint.sh -c 'max_connections=200'

我确信

docker-entrypoint.sh
不会修改任何内容，因为我确实可以从副本中看到绑定日志
0.0.0.0:5432
。

2024-09-24 19:26:04.317 GMT [32] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2024-09-24 19:26:04.317 GMT [32] LOG:  listening on IPv6 address "::", port 5432


Dockerfile
也不执行任何操作，它只是设置数据文件夹并将 
init-conf.sh
移动到适当的位置。

FROM postgres:16-bookworm

RUN apt update
RUN apt install -y -V ca-certificates lsb-release wget
# omitted pgoonga installation codes that does not interfere with networking
RUN mkdir -p /docker-entrypoint-initdb.d
RUN mkdir -p /var/lib/postgresql/data/docker
COPY init-conf.sh /etc/postgresql/init-conf.sh
RUN chmod +x /etc/postgresql/init-conf.sh
COPY docker-entrypoint-initdb.d /docker-entrypoint-initdb.d

还有初级？它。是。一样。

    db:
        build:
          context: .
          # dockerfile is same as replica, only that init-conf is ran as initialization script now and docker-entrypoint is removed BUT IT CHANGES NOTHING RELATED TO NETWORKING
          dockerfile: db.Dockerfile
        env_file:
          - '.env'
        ports:
            - ${POSTGRES_PRIMARY_PORT:-5432}:5432
        volumes:
            - ./pg_hba.conf:/etc/postgresql/pg_hba.conf
            - ./postgresql.conf:/etc/postgresql/postgresql.conf
            - postgres_primary_data:/var/lib/postgresql/data/docker
        command: |
            postgres 
            -c wal_level=replica 
            -c hot_standby=on 
            -c max_wal_senders=10 
            -c max_replication_slots=10 
            -c hot_standby_feedback=on

开始都是一样的

2024-09-24 19:26:02.264 GMT [1] LOG:  starting PostgreSQL 16.4 (Debian 16.4-1.pgdg120+1) on aarch64-unknown-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit
2024-09-24 19:26:02.264 GMT [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
2024-09-24 19:26:02.264 GMT [1] LOG:  listening on IPv6 address "::", port 5432
2024-09-24 19:26:02.266 GMT [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2024-09-24 19:26:02.268 GMT [73] LOG:  database system was shut down at 2024-09-24 19:26:02 GMT
2024-09-24 19:26:02.270 GMT [1] LOG:  database system is ready to accept connections

bouncer 可以很好地连接到主设备。

gbouncer 19:25:57.96 INFO  ==> Validating settings in PGBOUNCER_* env vars...
pgbouncer 19:25:57.96 INFO  ==> Initializing PgBouncer...
pgbouncer 19:25:57.97 INFO  ==> Waiting for PostgreSQL backend to be accessible
pgbouncer 19:26:02.49 INFO  ==> Backend db:5432 accessible
pgbouncer 19:26:02.49 INFO  ==> Configuring credentials
pgbouncer 19:26:02.50 INFO  ==> Creating configuration file
pgbouncer 19:26:02.60 INFO  ==> Loading custom scripts...
pgbouncer 19:26:02.61 INFO  ==> ** PgBouncer setup finished! **
postgresql docker docker-compose
1个回答
0
投票

您正在尝试连接到端口 5433（您已在主机上连接），但直接连接到容器。

"db-replica" (172.17.0.4), port 5433 failed

配置端口 5432（postgresql 在容器中侦听）。

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