docker ，\"ping\": executable file not found in $PATH": unknown

Question

我在同一网络上有这两个容器

docker inspect my_app_net
[
    {
        "Name": "my_app_net",
        "Id": "e136b758e8009e0361168aa0ead14ec85973c8d4f93e65122c22a2ff18f5e61f",
        "Created": "2018-03-22T21:11:51.781623693+01:00",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "172.19.0.0/16",
                    "Gateway": "172.19.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "a966584cd491caff18b25fa347b738a0853e5195ac517b5fb26bb019a271fc10": {
                "Name": "new_pizd",
                "EndpointID": "fdbacbbd564aeacccc57367dd082232e0498976ca485597b6ba8f6c82a0d4240",
                "MacAddress": "02:42:ac:13:00:03",
                "IPv4Address": "172.19.0.3/16",
                "IPv6Address": ""
            },
            "b36f350efca1f2e79bef8027a32f992021091fdd701e4d55d98af78984072150": {
                "Name": "new_nginx2",
                "EndpointID": "38731d2618aba0a7c63debd3b30a4c9b530d83a4fddbda97cdd2498298007120",
                "MacAddress": "02:42:ac:13:00:02",
                "IPv4Address": "172.19.0.2/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {}
    }
]

当我尝试从第一个开始 ping 第二个时

docker container exec -it new_pizd ping new_nginx2 
OCI runtime exec failed: exec failed: container_linux.go:348: starting container process caused "exec: \"ping\": executable file not found in $PATH": unknown

这很奇怪。如何检查docker变量$PATH？它引用哪个可执行文件？编辑

建议的答案要求 echo PATH，但它与我的 Ubuntu shell 中的相同

docker exec -ti new_nginx2 echo $PATH
/home/milenko/eclipse:/home/milenko/miniconda3/bin:/home/milenko/bin:/home/milenko/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

还有

milenko@milenko-System-Product-Name:~$ docker exec -ti new_nginx2 bash
root@b36f350efca1:/# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

我检查了垃圾箱，里面没有 ping

root@b36f350efca1:/bin# ls ping*
ls: cannot access 'ping*': No such file or directory

Answer 1

输出

OCI runtime exec failed: exec failed: container_linux.go:348: starting container process caused "exec: \"ping\": executable file not found in $PATH": unknown

表示ping找不到命令($PATH 配置错误，或 ping 不可用，或其他原因)。

How can I check the docker variable $PATH?

运行 $ docker exec -ti <CONTAINER> echo $PATH ，它应该输出如下内容

编辑:应为 $ docker exec -ti <CONTAINER> bash -c 'echo "$PATH"'

/home/user/.bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games

$PATH是 *nix shell 中设置的环境变量，它包含查找可执行文件的目录。

Which executable file does it refer to?

正如错误输出中所述，ping可执行的。一旦你知道$PATH的内容，您可以检查问题是什么( ping 应该在 /bin 中，至少在我这里 atm 的容器上)，并尝试解决它。​​

要打开交互式控制台来检查/操作容器，请运行 $ docker exec -ti <CONTAINER> bash 。

<小时/>

更新

I have checked the bin,there is no ping inside

您可能必须安装iputils-ping ，查看答案here ，但基本上(假设您的容器基于 Debian 或 Ubuntu 或类似发行版)运行

$ apt-get update
$ apt-get install iputils-ping