我正在尝试在macOS上构建一个Flask/PostgreSQL/SQLAlchemy/Alembic/libpq-dev/psycopg2 web应用程序。 我从未使用过Docker，所以我想我会尝试一下。我安装了它并正在完成入门步骤。
$ docker --version
Docker version 18.06.0-ce, build 0ffa825
$ docker-compose --version
docker-compose version 1.22.0, build f46880f
$ docker-machine --version
docker-machine version 0.15.0, build b48dc28d
然后我进入第二步：
$ docker run hello-world
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/engine/userguide/
一切都像文档一样工作，但后来我尝试了下一步，"启动一个 dockerized Web 服务器"，这就是发生的事情......
$ docker run -d -p 80:80 --name webserver nginx
159841d356d8cf6b16fd592b22daa76f3a734a8b35bf24f9f83b3dce6486d49e
docker: Error response from daemon: driver failed programming external connectivity on endpoint webserver (2d93210e398bf70794b706d6e07ca2c2b78297b9f337271710f4c62be8a79b7d): Error starting userland proxy: Bind for 0.0.0.0:80: unexpected error (Failure EADDRINUSE).
因此，我用谷歌搜索了该错误，并在github和stackoverflow等论坛上发现了许多此类或类似错误的实例。我尝试了我能找到的所有步骤来解决它。
sudo netstat -nl -p tcp | grep 8123
Password:
MyMacName@My-MacBook-Pro ~
$ sudo netstat -nl -p tcp | head
Active Internet connections
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp4 0 0 10.0.0.94.49655 54.174.175.30.443 ESTABLISHED
tcp4 0 0 10.0.0.94.49654 192.30.253.117.443 ESTABLISHED
tcp4 0 0 10.0.0.94.49653 50.16.137.101.443 ESTABLISHED
tcp4 0 0 10.0.0.94.49652 192.30.253.125.443 ESTABLISHED
tcp4 0 0 10.0.0.94.49651 151.101.4.133.443 ESTABLISHED
tcp4 0 0 10.0.0.94.49650 151.101.4.133.443 ESTABLISHED
tcp4 0 0 10.0.0.94.49649 151.101.56.133.443 ESTABLISHED
tcp4 0 0 10.0.0.94.49648 34.238.78.202.443 ESTABLISHED
但我不知道该怎么做，所以它本身对我没有任何好处。所以我找到了这些步骤并尝试了它们...
$ docker stop $(docker ps -a -q)
2eb7a75a5fd7
$ docker rm $(docker ps -a -q);
2eb7a75a5fd7
$ docker volume rm $(docker volume ls -qf dangling=true)
"docker volume rm" requires at least 1 argument.
See 'docker volume rm --help'.
Usage: docker volume rm [OPTIONS] VOLUME [VOLUME...]
Remove one or more volumes
$ docker network rm $(docker network ls -q)
Error response from daemon: bridge is a pre-defined network and cannot be removed
Error response from daemon: host is a pre-defined network and cannot be removed
Error response from daemon: none is a pre-defined network and cannot be removed
$ sudo lsof -nP | grep LISTEN
Password:
httpd 97 root 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
mysqld 113 _mysql 19u IPv6 0xb250f70d0ca8a1dd 0t0 TCP *:3306 (LISTEN)
mysqld 113 _mysql 22u IPv6 0xb250f70d0ca8a79d 0t0 TCP *:33060 (LISTEN)
awacsd 215 root 8u IPv6 0xb250f70d0ca8b31d 0t0 TCP [fd24:e01e:118f:e97:75e1:c8cf:5efb:c34c]:4488 (LISTEN)
httpd 234 MyMacName 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
httpd 235 MyMacName 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
httpd 236 MyMacName 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
httpd 237 MyMacName 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
httpd 238 MyMacName 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
rapportd 402 MyMacName 3u IPv4 0xb250f70d1db86225 0t0 TCP *:58588 (LISTEN)
rapportd 402 MyMacName 4u IPv6 0xb250f70d0ca8851d 0t0 TCP *:58588 (LISTEN)
postgres 441 MyMacName 5u IPv6 0xb250f70d0ca8965d 0t0 TCP [::1]:5432 (LISTEN)
postgres 441 MyMacName 6u IPv6 0xb250f70d0ca8ad5d 0t0 TCP [fe80:1::1]:5432 (LISTEN)
postgres 441 MyMacName 7u IPv4 0xb250f70d0cf3db85 0t0 TCP 127.0.0.1:5432 (LISTEN)
Adobex20 567 MyMacName 13u IPv4 0xb250f70d1335fe45 0t0 TCP 127.0.0.1:15292 (LISTEN)
Adobex20 567 MyMacName 31u IPv4 0xb250f70d0ecd1225 0t0 TCP 127.0.0.1:15393 (LISTEN)
httpd 744 MyMacName 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
node 746 MyMacName 15u IPv4 0xb250f70d0e5be225 0t0 TCP 127.0.0.1:49255 (LISTEN)
httpd 748 MyMacName 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
httpd 749 MyMacName 4u IPv6 0xb250f70d0ca8909d 0t0 TCP *:80 (LISTEN)
cupsd 3415 root 5u IPv6 0xb250f70d13944e9d 0t0 TCP [::1]:631 (LISTEN)
cupsd 3415 root 6u IPv4 0xb250f70d16c228c5 0t0 TCP 127.0.0.1:631 (LISTEN)
pgAdmin4 4253 MyMacName 14u IPv4 0xb250f70d0e7638c5 0t0 TCP 127.0.0.1:54792 (LISTEN)
不幸的是，我也不知道这意味着什么。我认为问题可能是最后一行显示PostgreSQL的PgAdmin4正在运行。所以进入实用程序监视器并强制退出。由于某种原因，我仍然有 5-6 个"postgres"实例无法强制退出。这一定与我的Mac带有某种帖子有关。
我粘贴在这里的任何内容是否可以帮助了解 Docker 的人诊断我可以做些什么来克服这一点？
$ docker run -d -p 80:80 --name webserver nginx
159841d356d8cf6b16fd592b22daa76f3a734a8b35bf24f9f83b3dce6486d49e
docker: Error response from daemon: driver failed programming external connectivity on endpoint webserver (2d93210e398bf70794b706d6e07ca2c2b78297b9f337271710f4c62be8a79b7d): Error starting userland proxy: Bind for 0.0.0.0:80: unexpected error (Failure EADDRINUSE).
你可以docker -d -p [another_host_port]：80 -- 命名网络服务器nginx以将其绑定到另一个端口而不是80，我认为还有另一个使用端口80的应用程序或实例你没有找到。
码头工人端口绑定语法：host:guest. (https://docs.docker.com/engine/reference/run/#expose-incoming-ports(
在这里，nginx在Docker实例中运行并公开80本身，因此我们将nginx的80(来宾(映射到我们想要的端口(主机(，并通过该端口访问应用程序。
我遇到了同样的问题，但 docker 重启无济于事。 所以我启动了 Kitematic 并打开了我的 postgres 容器的设置，并再次将配置的端口更改为localhost：5432。现在它对我有用。
或者使用以下命令：
docker stop postgres
docker commit postgres postgres2
docker run -p 54320:5432 -td postgres2