小编Cor*_*rey的帖子

我尝试echo $GID但一无所获。但是，我可以通过使用获得 1000 id -g，它们之间有什么区别？

id -u     => 1000
id -g     => 1000
echo $UID => 1000
echo $GID => 

的输出id：

uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),113(lpadmin),128(sambashare),999(docker)

的输出groups：

user adm cdrom sudo dip plugdev lpadmin sambashare docker

Ubuntu 版本：

Distributor ID: Ubuntu
Description:    Ubuntu 16.04.6 LTS
Release:    16.04
Codename:   xenial

我正在根据这个学习docker-compose 。

我跑后docker-compose up，它说

/tmp/_MEIepUvmP/docker/api/client.py:163: UserWarning: The minimum API version supported is 1.21, but you are using version 1.18. It is recommended you either upgrade Docker Engine or use an older version of Docker SDK for Python.
Traceback (most recent call last):
  File "bin/docker-compose", line 6, in <module>
  File "compose/cli/main.py", line 71, in main
  File "compose/cli/main.py", line 124, in perform_command
  File "compose/cli/main.py", line 1001, in up
  File "compose/cli/main.py", line 997, in up
  File "compose/project.py", line 451, …