$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
$ docker pull mongo:2.6
mongo:2.6: The image you are pulling has been verified
511136ea3c5a: Pull complete 
5a7d9470be44: Pull complete 
feb755848a9a: Pull complete 
1627d948a24f: Pull complete 
fa822d72bf37: Pull complete 
49b4737cc97a: Pull complete 
eb6f031b83d2: Pull complete 
b251ce5098a8: Pull complete 
b4ddce5f31a3: Pull complete 
839e041c9eec: Pull complete 
52422a1b50e1: Pull complete 
5d63fb31d79d: Pull complete 
60d391ff57d4: Pull complete 
97d8b6dd3b57: Pull complete 
Status: Downloaded newer image for mongo:2.6
$ docker images mongo
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
mongo               2.6                 97d8b6dd3b57        5 days ago          391.4 MB
$ docker pull stackbrew/mongo:2.6
Pulling repository stackbrew/mongo
97d8b6dd3b57: Download complete 
511136ea3c5a: Download complete 
5a7d9470be44: Download complete 
feb755848a9a: Download complete 
1627d948a24f: Download complete 
fa822d72bf37: Download complete 
49b4737cc97a: Download complete 
eb6f031b83d2: Download complete 
b251ce5098a8: Download complete 
b4ddce5f31a3: Download complete 
839e041c9eec: Download complete 
52422a1b50e1: Download complete 
5d63fb31d79d: Download complete 
60d391ff57d4: Download complete 
Status: Image is up to date for stackbrew/mongo:2.6
$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
mongo               2.6                 97d8b6dd3b57        5 days ago          391.4 MB
stackbrew/mongo     2                   97d8b6dd3b57        5 days ago          391.4 MB
stackbrew/mongo     2.6                 97d8b6dd3b57        5 days ago          391.4 MB
stackbrew/mongo     latest              97d8b6dd3b57        5 days ago          391.4 MB
stackbrew/mongo     2.6.5               97d8b6dd3b57        5 days ago          391.4 MB