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add constraint to service create ref 

Signed-off-by: Charles Smith <charles.smith@docker.com>
This commit is contained in:
Charles Smith 2016-07-07 16:57:46 -07:00
parent efcf24f0c4
commit 093817031a
1 changed files with 29 additions and 2 deletions
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31
docs/reference/commandline/service_create.md
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@ -94,7 +94,7 @@ ID NAME REPLICAS IMAGE COMMAND
```
### Create a service with a rolling update constraints
### Create a service with a rolling update policy
```bash
@ -133,7 +133,7 @@ $ docker service create \
For more information about labels, refer to [apply custom
metadata](../../userguide/labels-custom-metadata.md)
### Service mode
### Set service mode
Is this a replicated service or a global service. A replicated service runs as
many tasks as specified, while a global service runs on each active node in the
@ -145,6 +145,33 @@ The following command creates a "global" service:
$ docker service create --name redis_2 --mode global redis:3.0.6
```
### Specify service constraints
You can limit the set of nodes where a task can be scheduled by defining
constraint expressions. Multiple constraints find nodes that satisfy every
expression (AND match). Constraints can match node or Docker Engine labels as
follows:
| node attribute | matches | example |
|:------------- |:-------------| :---------------------------------------------|
| node.id | node ID | `node.id == 2ivku8v2gvtg4` |
| node.hostname | node hostname | `node.hostname != node-2` |
| node.role | node role: manager | `node.role == manager` |
| node.labels | user defined node labels | `node.labels.security == high` |
| engine.labels | Docker Engine's labels | `engine.labels.operatingsystem == ubuntu 14.04`|
`engine.labels` apply to Docker Engine labels like operating system,
drivers, etc. Swarm administrators add `node.labels` for operational purposes by
using the `docker node update` command.
For example, the following limits tasks for the redis service to nodes where the
node type label equals queue:
```bash
$ docker service create \
--name redis_2 \
--constraint node.labels.type == queue
```
## Related information