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host-local: allow ip request via CNI_ARGS

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A specific IP can now be requested via the environment variable CNI_ARGS, e.g.
`CNI_ARGS=ip=1.2.3.4`.
The plugin will try to reserve the specified IP.
If this is not successful the execution will fail.
This commit is contained in:
Stefan Junker 2015-08-16 02:30:04 +02:00
parent a41e1a699e
commit a75401a13b
1 changed files with 5 additions and 0 deletions
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host-local.md
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@ -31,6 +31,11 @@ It stores the state locally on the host filesystem, therefore ensuring uniquenes
* `gateway` (string, optional): IP inside of "subnet" to designate as the gateway. Defaults to ".1" IP inside of the "subnet" block.
* `routes` (string, optional): list of routes to add to the container namespace. Each route is a dictionary with "dst" and optional "gw" fields. If "gw" is omitted, value of "gateway" will be used.
## Supported arguments
The following [CNI_ARGS](https://github.com/appc/cni/blob/master/SPEC.md#parameters) are supported:
* `ip`: request a specific IP address from the subnet. If it's not available, the plugin will exit with an error
## Files
Allocated IP addresses are stored as files in /var/lib/cni/networks/$NETWORK_NAME.