It appears the – prefix is not used in newer docker versions so I ran the commands without it.
The command docker info returns:
Containers: 1
Images: 11
Storage Driver: overlay
Backing Filesystem: extfs
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 4.1.5-x86_64-linode61
Operating System: Gentoo/Linux
CPUs: 2
Total Memory: 1.952 GiB
Name: linodevps
ID: 2C7H:MOAS:GM2N:JMG7:GYY5:CNNF:R33M:QNKK:3U6K:2N27:OOAU:PZRG
WARNING: No swap limit support
The command docker version returns:
Client:
Version: 1.8.1
API version: 1.20
Go version: go1.4.2
Git commit: d12ea79
Built:
OS/Arch: linux/amd64
Server:
Version: 1.8.1
API version: 1.20
Go version: go1.4.2
Git commit: d12ea79
Built:
OS/Arch: linux/amd64
Also, in case it matters, when merging the docker package the following notice appeared:
* Checking for suitable kernel configuration options...
* CONFIG_MEMCG_KMEM: is optional
* CONFIG_MEMCG_SWAP: is required if you wish to limit swap usage of containers
* CONFIG_MEMCG_SWAP_ENABLED: is not set when it should be.
* CONFIG_CGROUP_HUGETLB: is not set when it should be.
* CONFIG_RT_GROUP_SCHED: is not set when it should be.