awk - 来自 docker-machine 中 awk 的意外行为

受到 this post 的启发，我尝试在 Mac 上使用 docker-machine 来停止正在运行的容器。但是，awk 在 docker-machine ssh 中的行为似乎与直接“在”容器中运行时不同。

当我直接通过 ssh 连接到容器时，一切都按预期工作:

me@myMac:~$ docker-machine ssh default
docker@default:~$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                NAMES
028fd7148881        myrepo/mycontainer  "apachectl -DFOREGROU"   14 minutes ago      Up 14 minutes       0.0.0.0:80->80/tcp   gloomy_mayer
docker@default:~$ docker ps | awk 'NR > 1 {print $1}'
028fd7148881
docker@default:~$ docker ps | awk 'NR > 1 {print $1}' | xargs --no-run-if-empty docker kill
028fd7148881
docker@default:~$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

但是当远程运行时，awk 表现不同:

me@myMac:~$ docker-machine ssh default "docker ps"
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
7927b10b8a28        myrepo/mycontainer  "apachectl -DFOREGROU"   11 seconds ago      Up 10 seconds       80/tcp              happy_wozniak
me@myMac:~$ docker-machine ssh default "docker ps | awk 'NR > 1 {print $1}'"
7927b10b8a28        myrepo/mycontainer  "apachectl -DFOREGROU"   About a minute ago   Up About a minute   80/tcp              happy_wozniak
me@myMac:~$ docker-machine ssh default "docker ps | awk 'NR > 1 {print $1}' | xargs --no-run-if-empty docker kill"
7927b10b8a28
Failed to kill container (myrepo/mycontainer): Error response from daemon: Cannot kill container myrepo/mycontainer: No such container: myRepo/myContainer
Failed to kill container (apachectl -DFOREGROU): Error response from daemon: Cannot kill container apachectl -DFOREGROU: No such container: apachectl -DFOREGROU
Failed to kill container (3): Error response from daemon: Cannot kill container 3: No such container: 3
...

为什么 awk 在 docker-machine 下表现不同？

最佳答案

"docker ps | awk 'NR > 1 {print \$1}' | xargs --no-run-if-empty docker kill"


$ ==> \$

docker ps -q

关于awk - 来自 docker-machine 中 awk 的意外行为，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36560576/