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explain expression syntax in README 

Signed-off-by: Chanwit Kaewkasi <chanwit@gmail.com>
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Chanwit Kaewkasi 2015-01-11 14:40:04 +07:00
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scheduler/filter/README.md
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@ -147,6 +147,18 @@ CONTAINER ID IMAGE COMMAND CREATED
As you can see here, the containers were only scheduled on nodes with the redis imagealreayd pulled.
#### Constraint Expression Syntax
Additionally, you can use a not (`!`) to negate and a regular expression in the form of `/regexp/` for specifying a constraint.
For example,
* `name=node1` will match nodes named with `node1`.
* `name=!node1` will match all nodes, except `node1`.
* `region=!us*` will match all nodes outside the regions prefixed with `us`.
* `name=/node[12]/` will match nodes named `node1` and `node2`.
* `name=/node\d/` will match all nodes named with `node` + 1 digit
* `node=!/node-[01]-id/` will match all nodes, except those with ids `node-0-id` and `node-1-id`
## Port Filter
With this filter, `ports` are considered as a unique resource.