在我生命的最后4天里，我一直在与这个问题作斗争，它让我抓狂。我试图在RHEL8中部署一个使用postgresDB的服务。为了做到这一点，我将使用docker compose来部署它们。
问题是，从服务容器中，我可以ping postgres容器，但服务无法连接DB。。。
我简化了用例，并使用了一个docker compose，它使用adminer-docker映像来连接任何列出的数据库管理器，包括postgres。它在我的机器和使用ubuntu 20的测试服务器上运行得很好，但当我在RHEL 8中尝试它时，我也无法访问DB！
这是docker和docker组合版本：Docker:
Client: Docker Engine - Community
Version: 19.03.13
API version: 1.40
Go version: go1.13.15
Git commit: 4484c46d9d
Built: Wed Sep 16 17:02:36 2020
OS/Arch: linux/amd64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 19.03.13
API version: 1.40 (minimum version 1.12)
Go version: go1.13.15
Git commit: 4484c46d9d
Built: Wed Sep 16 17:01:11 2020
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.3.7
GitCommit: 8fba4e9a7d01810a393d5d25a3621dc101981175
runc:
Version: 1.0.0-rc10
GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
docker-init:
Version: 0.18.0
GitCommit: fec3683
Docker撰写
docker-compose version 1.25.5, build 8a1c60f6
docker-py version: 4.1.0
CPython version: 3.7.5
OpenSSL version: OpenSSL 1.1.0l 10 Sep 2019
操作系统
Red Hat Enterprise Linux release 8.1 (Ootpa)
我使用的实际docker组合是：
version: '3.1'
services:
db:
image: postgres
restart: always
environment:
POSTGRES_PASSWORD: example
adminer:
image: adminer
restart: always
ports:
- 8080:8080
与我在其他两个系统中获得的日志相比，postgres容器的日志似乎很好：
db_1 | The files belonging to this database system will be owned by user "postgres".
db_1 | This user must also own the server process.
db_1 |
db_1 | The database cluster will be initialized with locale "en_US.utf8".
db_1 | The default database encoding has accordingly been set to "UTF8".
db_1 | The default text search configuration will be set to "english".
db_1 |
db_1 | Data page checksums are disabled.
db_1 |
db_1 | fixing permissions on existing directory /var/lib/postgresql/data ... ok
db_1 | creating subdirectories ... ok
db_1 | selecting dynamic shared memory implementation ... posix
db_1 | selecting default max_connections ... 100
db_1 | selecting default shared_buffers ... 128MB
db_1 | selecting default time zone ... Etc/UTC
db_1 | creating configuration files ... ok
db_1 | running bootstrap script ... ok
db_1 | performing post-bootstrap initialization ... ok
db_1 | syncing data to disk ... ok
db_1 |
db_1 |
db_1 | Success. You can now start the database server using:
db_1 |
db_1 | pg_ctl -D /var/lib/postgresql/data -l logfile start
db_1 |
db_1 | initdb: warning: enabling "trust" authentication for local connections
db_1 | You can change this by editing pg_hba.conf or using the option -A, or
db_1 | --auth-local and --auth-host, the next time you run initdb.
db_1 | waiting for server to start....2020-10-12 08:18:28.489 UTC [46] LOG: starting PostgreSQL 12.4 (Debian 12.4-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1 | 2020-10-12 08:18:28.499 UTC [46] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db_1 | 2020-10-12 08:18:28.545 UTC [47] LOG: database system was shut down at 2020-10-12 08:18:25 UTC
db_1 | 2020-10-12 08:18:28.557 UTC [46] LOG: database system is ready to accept connections
db_1 | done
db_1 | server started
db_1 |
db_1 | /usr/local/bin/docker-entrypoint.sh: ignoring /docker-entrypoint-initdb.d/*
db_1 |
db_1 | waiting for server to shut down...2020-10-12 08:18:28.572 UTC [46] LOG: received fast shutdown request
db_1 | .2020-10-12 08:18:28.581 UTC [46] LOG: aborting any active transactions
db_1 | 2020-10-12 08:18:28.582 UTC [46] LOG: background worker "logical replication launcher" (PID 53) exited with exit code 1
db_1 | 2020-10-12 08:18:28.583 UTC [48] LOG: shutting down
db_1 | 2020-10-12 08:18:28.648 UTC [46] LOG: database system is shut down
db_1 | done
db_1 | server stopped
db_1 |
db_1 | PostgreSQL init process complete; ready for start up.
db_1 |
db_1 | 2020-10-12 08:18:28.693 UTC [1] LOG: starting PostgreSQL 12.4 (Debian 12.4-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1 | 2020-10-12 08:18:28.694 UTC [1] LOG: listening on IPv4 address "0.0.0.0", port 5432
db_1 | 2020-10-12 08:18:28.694 UTC [1] LOG: listening on IPv6 address "::", port 5432
db_1 | 2020-10-12 08:18:28.712 UTC [1] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db_1 | 2020-10-12 08:18:28.751 UTC [55] LOG: database system was shut down at 2020-10-12 08:18:28 UTC
db_1 | 2020-10-12 08:18:28.764 UTC [1] LOG: database system is ready to accept connections
以前有人遇到过这个问题吗？你有什么建议我可以试试吗？
编辑：管理员容器日志与其他计算机的日志完全相同。他们只是在尝试连接时抛出这个错误，而不是一条ok消息：
Is the server running on host "postgres" (10.10.10.2) and accepting TCP/IP connections on port 5432?
我猜您是从某个站点安装了docker的。对于RHEL8，尝试使用不需要守护程序的Podman和Buildah-OCI兼容的替代方案。本文对此进行了解释。这些是RHEL8中默认的容器工具。
在RHEL 8环境中检查管理员容器中的日志，您将能够从中发现问题。
命令将是docker logs adminer container name