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config: Make default Linux filesystems an example #679

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14 changes: 0 additions & 14 deletions config-linux.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,20 +3,6 @@
This document describes the schema for the [Linux-specific section](config.md#platform-specific-configuration) of the [container configuration](config.md).
The Linux container specification uses various kernel features like namespaces, cgroups, capabilities, LSM, and filesystem jails to fulfill the spec.

## Default Filesystems

The Linux ABI includes both syscalls and several special file paths.
Applications expecting a Linux environment will very likely expect these file paths to be setup correctly.

The following filesystems SHOULD be made available in each container's filesystem:

| Path | Type |
| -------- | ------ |
| /proc | [procfs](https://www.kernel.org/doc/Documentation/filesystems/proc.txt) |
| /sys | [sysfs](https://www.kernel.org/doc/Documentation/filesystems/sysfs.txt) |
| /dev/pts | [devpts](https://www.kernel.org/doc/Documentation/filesystems/devpts.txt) |
| /dev/shm | [tmpfs](https://www.kernel.org/doc/Documentation/filesystems/tmpfs.txt) |

## Namespaces

A namespace wraps a global system resource in an abstraction that makes it appear to the processes within the namespace that they have their own isolated instance of the global resource.
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41 changes: 35 additions & 6 deletions config.md
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Expand Up @@ -63,19 +63,48 @@ For Solaris, the mounts corresponds to fs resource in zonecfg(8).

### Example (Linux)

## Common Linux Filesystems

The Linux ABI includes both syscalls and several special file paths.
Applications expecting a Linux environment will very likely expect these file paths to be setup correctly.
Configuration authors interested in providing common filesystems can consider entries like:

```json
"mounts": [
{
"destination": "/tmp",
"destination": "/proc",
"type": "proc",
"source": "proc"
},
{
"destination": "/dev",
"type": "tmpfs",
"source": "tmpfs",
"options": ["nosuid","strictatime","mode=755","size=65536k"]
"options": ["nosuid", "strictatime", "mode=755", "size=65536k"]
},
{
"destination": "/dev/pts",
"type": "devpts",
"source": "devpts",
"options": ["nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620", "gid=5"]
},
{
"destination": "/dev/shm",
"type": "tmpfs",
"source": "shm",
"options": ["nosuid", "noexec", "nodev", "mode=1777", "size=65536k"]
},
{
"destination": "/dev/mqueue",
"type": "mqueue",
"source": "mqueue",
"options": ["nosuid", "noexec", "nodev"]
},
{
"destination": "/data",
"type": "bind",
"source": "/volumes/testing",
"options": ["rbind","rw"]
"destination": "/sys",
"type": "sysfs",
"source": "sysfs",
"options": ["nosuid", "noexec", "nodev", "ro"]
}
]
```
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