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Update run.md ENV docs 

Signed-off-by: John Howard <jhoward@microsoft.com>
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John Howard 2017-01-05 15:35:24 -08:00
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docs/reference/run.md
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@ -1385,30 +1385,68 @@ it will provide a named alias for the container being linked to.
### ENV (environment variables)
When a new container is created, Docker will set the following environment
variables automatically:
Docker automatically sets some environment variables when creating a Linux
container. Docker does not set any environment variables when creating a Windows
container.
The following environment variables are set for Linux containers:
| Variable | Value |
| -------- | ----- |
| `HOME` | Set based on the value of `USER` |
| `HOSTNAME` | The hostname associated with the container |
| `PATH` | Includes popular directories, such as `:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin` |
| `PATH` | Includes popular directories, such as `/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin` |
| `TERM` | `xterm` if the container is allocated a pseudo-TTY |
Additionally, the operator can **set any environment variable** in the
container by using one or more `-e` flags, even overriding those mentioned
above, or already defined by the developer with a Dockerfile `ENV`:
$ docker run -e "deep=purple" --rm ubuntu /bin/bash -c export
declare -x HOME="/"
declare -x HOSTNAME="85bc26a0e200"
declare -x OLDPWD
declare -x PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
declare -x PWD="/"
declare -x SHLVL="1"
declare -x deep="purple"
```bash
$ docker run -e "deep=purple" --rm alpine env
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=d2219b854598
deep=purple
HOME=/root
```
Similarly the operator can set the **hostname** with `-h`.
```PowerShell
PS C:\> docker run --rm -e "foo=bar" microsoft/nanoserver cmd /s /c set
ALLUSERSPROFILE=C:\ProgramData
APPDATA=C:\Users\ContainerAdministrator\AppData\Roaming
CommonProgramFiles=C:\Program Files\Common Files
CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
CommonProgramW6432=C:\Program Files\Common Files
COMPUTERNAME=C2FAEFCC8253
ComSpec=C:\Windows\system32\cmd.exe
foo=bar
LOCALAPPDATA=C:\Users\ContainerAdministrator\AppData\Local
NUMBER_OF_PROCESSORS=8
OS=Windows_NT
Path=C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Users\ContainerAdministrator\AppData\Local\Microsoft\WindowsApps
PATHEXT=.COM;.EXE;.BAT;.CMD
PROCESSOR_ARCHITECTURE=AMD64
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 62 Stepping 4, GenuineIntel
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=3e04
ProgramData=C:\ProgramData
ProgramFiles=C:\Program Files
ProgramFiles(x86)=C:\Program Files (x86)
ProgramW6432=C:\Program Files
PROMPT=$P$G
PUBLIC=C:\Users\Public
SystemDrive=C:
SystemRoot=C:\Windows
TEMP=C:\Users\ContainerAdministrator\AppData\Local\Temp
TMP=C:\Users\ContainerAdministrator\AppData\Local\Temp
USERDOMAIN=User Manager
USERNAME=ContainerAdministrator
USERPROFILE=C:\Users\ContainerAdministrator
windir=C:\Windows
```
Similarly the operator can set the **HOSTNAME** (Linux) or **COMPUTERNAME** (Windows) with `-h`.
### HEALTHCHECK