我知道这似乎是一种常见情况，但我发现没有任何帮助。
我正在逐字遵循 docker ' Getting-started ' 指南，从字面上复制和粘贴命令。但是当我到达这一步时：
docker run -dp 3000:3000 \
-w /app -v "$(pwd):/app" \
--network todo-app \
-e MYSQL_HOST=mysql \
-e MYSQL_USER=root \
-e MYSQL_PASSWORD=secret \
-e MYSQL_DB=todos \
node:12-alpine \
sh -c "yarn install && yarn run dev"
日志输出如下：
{ Error: connect EHOSTUNREACH 172.18.0.2:3306
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1107:14)
errno: 'EHOSTUNREACH',
code: 'EHOSTUNREACH',
syscall: 'connect',
address: '172.18.0.2',
port: 3306 }
这是一个问题，我可以成功地从主机系统连接到容器中运行的 mysql：
$ mysql -h172.18.0.2 -uroot -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 8.0.27 MySQL Community Server - GPL
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL [(none)]>
此外，从“应用程序”容器中，我可以成功 ping 到“mysql”主机。'nc' 无法连接：
[mmorsi@localhost app]$ docker exec e8df2d36914 ping -c 3 mysql
PING mysql (172.18.0.2): 56 data bytes
64 bytes from 172.18.0.2: seq=0 ttl=64 time=0.071 ms
64 bytes from 172.18.0.2: seq=1 ttl=64 time=0.173 ms
64 bytes from 172.18.0.2: seq=2 ttl=64 time=0.176 ms
--- mysql ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0.071/0.140/0.176 ms
[mmorsi@localhost app]$ docker exec e8df2d36914 nc -z -v mysql 3306
nc: mysql (172.18.0.2:3306): Host is unreachable
我尝试过的其他事情：
- 运行最新的 mysql docker 镜像
- 在 centos:latest 映像上运行“应用程序”（带有安装 deps 的必要步骤）
我的主机系统是 Fedora 33。在主机上，docker0 接口正在“受信任”区域中运行（目标：ACCEPT）：
[mmorsi@localhost app]$ sudo firewall-cmd --get-active-zones
FedoraWorkstation
interfaces: enp0s31f6
trusted
interfaces: docker0
[mmorsi@localhost app]$ man firewall-cmd
[mmorsi@localhost app]$ sudo firewall-cmd --info-zone=trusted
trusted (active)
target: ACCEPT
icmp-block-inversion: no
interfaces: docker0
sources:
services:
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
我完全没主意了。任何帮助或见解将不胜感激。