## Testing inter-service connectivity

This test uses the redis server and client. You will schedule redis to run on a worker, then log into the manager and connect with a redis client image.

On the manager:

```
root@scw-93f02d:~# docker service create --network=testnet --name redis --publish 6379 --replicas=1 --constraint='node.role != manager' redis:latest
xa5f3uiseu7k6rz45x41a3nem
```

Check service started:

```
root@scw-93f02d:~# docker service ps redis
ID            NAME     IMAGE         NODE    DESIRED STATE  CURRENT STATE          ERROR  PORTS
psrpw5akjjl5  redis.1  redis:latest  worker  Running        Running 2 seconds ago         
```

From the manager: run a container to attach to redis:

```
root@scw-93f02d:~# docker run --net=testnet -ti redis:latest redis-cli -h redis
redis:6379> incr docker-awesome
(integer) 1
redis:6379> 
```

Control + D to exit, then check swarm status:

```
root@scw-93f02d:~# docker service ls
ID            NAME   MODE        REPLICAS  IMAGE
sjkhmujg1ehi  web    replicated  5/5       nginx:latest
xa5f3uiseu7k  redis  replicated  1/1       redis:latest
```

```
root@scw-93f02d:~# docker node ls
ID                           HOSTNAME    STATUS  AVAILABILITY  MANAGER STATUS
39kw5i5aix9mxzw06h6y3v07e    worker      Ready   Active        
z4vpwtut5v66nwi0jijco6mjn *  scw-93f02d  Ready   Active        Leader
root@scw-93f02d:~#
```