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update expression syntax in doc 

Signed-off-by: Chanwit Kaewkasi <chanwit@gmail.com>
This commit is contained in:
Chanwit Kaewkasi 2015-01-20 15:42:21 +07:00
parent 3c147df81a
commit bf852ec243
1 changed files with 15 additions and 15 deletions
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scheduler/filter/README.md
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@ -95,11 +95,11 @@ CONTAINER ID IMAGE COMMAND CREATED
87c4376856a8 nginx:latest "nginx" Less than a second ago running 192.168.0.42:80->80/tcp node-1 front
```
Using `-e affinity:container=front` will schedule a container next to the container `front`.
You can also use IDs instead of name: `-e affinity:container=87c4376856a8`
Using `-e affinity:container==front` will schedule a container next to the container `front`.
You can also use IDs instead of name: `-e affinity:container==87c4376856a8`
```
$ docker run -d --name logger -e affinity:container=front logger
$ docker run -d --name logger -e affinity:container==front logger
87c4376856a8
$ docker ps
@ -124,14 +124,14 @@ Here only `node-1` and `node-3` have the `redis` image. Using `-e affinity:image
schedule container only on these 2 nodes. You can also use the image ID instead of it's name.
```
$ docker run -d --name redis1 -e affinity:image=redis redis
$ docker run -d --name redis2 -e affinity:image=redis redis
$ docker run -d --name redis3 -e affinity:image=redis redis
$ docker run -d --name redis4 -e affinity:image=redis redis
$ docker run -d --name redis5 -e affinity:image=redis redis
$ docker run -d --name redis6 -e affinity:image=redis redis
$ docker run -d --name redis7 -e affinity:image=redis redis
$ docker run -d --name redis8 -e affinity:image=redis redis
$ docker run -d --name redis1 -e affinity:image==redis redis
$ docker run -d --name redis2 -e affinity:image==redis redis
$ docker run -d --name redis3 -e affinity:image==redis redis
$ docker run -d --name redis4 -e affinity:image==redis redis
$ docker run -d --name redis5 -e affinity:image==redis redis
$ docker run -d --name redis6 -e affinity:image==redis redis
$ docker run -d --name redis7 -e affinity:image==redis redis
$ docker run -d --name redis8 -e affinity:image==redis redis
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NODE NAMES
@ -147,9 +147,9 @@ 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
#### Expression Syntax
As previously mentioned, a constraint consists of a `key` and a `value`.
An affinity or a constraint expression consists of a `key` and a `value`.
A `key` must conform the alpha-numeric pattern, with the leading alphabet or underscore.
A `value` must be one of the following:
@ -157,8 +157,8 @@ A `value` must be one of the following:
* A globbing pattern, i.e., `abc*`.
* A regular expression in the form of `/regexp/`. We support the Go's regular expression syntax.
You can use a not (`!`) to negate and a regular expression in the form of `/regexp/` for specifying a constraint.
Relative comparisons, `>=` and `<=` are also supported, but they are limited to `string` comparison only.
Current `swarm` supports affinity/constraint operators as the following: `==`, `!=`, `>=` and `<=`.
Relative comparisons, `>=` and `<=` are supported, but limited to `string` comparison only.
For example,
* `constraint:name==node1` will match nodes named with `node1`.