sudo 和 wheel组
查看docker用户信息，
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| id docker
uid=1001(docker) gid=1001(docker) groups=1001(docker)
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docker用户没有加入/etc/sudoers，因此sudo命令失败。
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| [docker@cheney-hp etc]$ sudo ip addr
[sudo] password for docker:
docker is not in the sudoers file. This incident will be reported.
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解决该问题有两种方式，一种是把docker加入/etc/sudoers，例如echo 'docker ALL=(ALL) ALL' >> /etc/sudoers，另一种方式是把docker加入wheel用户组。
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| sudo gpasswd -a docker wheel
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| [docker@cheney-hp etc]$ sudo ip addr
[sudo] password for docker:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
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