clusterdock

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clusterdock is a Python 3 project that enables users to build, start, and manage Docker container-based clusters. It uses a pluggable system for defining new types of clusters using folders called topologies and is a swell project, if I may say so myself.

“I hate reading, make this quick.”

Before doing anything, install a recent version of Docker to your machine. Next, clone a clusterdock topology to your machine. For this example, we’ll use the nodebase topology. Assuming that you’ve already installed clusterdock, you could start a 2-node cluster:

$ git clone https://github.com/clusterdock/topology_nodebase.git
$ clusterdock start topology_nodebase
2017-08-03 10:04:18 PM clusterdock.models   INFO     Starting cluster on network (cluster) ...
2017-08-03 10:04:18 PM clusterdock.models   INFO     Starting node node-1.cluster ...
2017-08-03 10:04:19 PM clusterdock.models   INFO     Starting node node-2.cluster ...
2017-08-03 10:04:20 PM clusterdock.models   INFO     Cluster started successfully (total time: 00:00:01.621).

To list cluster nodes:

$ clusterdock ps

For cluster `famous_hyades` on network cluster the node(s) are:
CONTAINER ID     HOST NAME            PORTS              STATUS        CONTAINER NAME          VERSION    IMAGE
a205d88beb       node-2.cluster                          running       nervous_sinoussi        1.3.3      clusterdock/topology_nodebase:centos6.6
6f2825c596       node-1.cluster       8080->80/tcp       running       priceless_franklin      1.3.3      clusterdock/topology_nodebase:centos6.6

To SSH into a node and look around:

$ clusterdock ssh node-1.cluster
[root@node-1 ~]# ls -l / | head
total 64
dr-xr-xr-x   1 root root 4096 May 19 20:48 bin
drwxr-xr-x   5 root root  360 Aug  4 05:04 dev
drwxr-xr-x   1 root root 4096 Aug  4 05:04 etc
drwxr-xr-x   2 root root 4096 Sep 23  2011 home
dr-xr-xr-x   7 root root 4096 Mar  4  2015 lib
dr-xr-xr-x   1 root root 4096 May 19 20:48 lib64
drwx------   2 root root 4096 Mar  4  2015 lost+found
drwxr-xr-x   2 root root 4096 Sep 23  2011 media
drwxr-xr-x   2 root root 4096 Sep 23  2011 mnt
[root@node-1 ~]# exit

To see the complete usage message for the topology:

$ clusterdock start topology_nodebase -h
usage: clusterdock start [-h] [--node-disks map] [--always-pull]
                         [--namespace ns] [--network nw] [-o sys] [-r url]
                         [--nodes node [node ...]]
                         topology

Start a nodebase cluster

positional arguments:
  topology              A clusterdock topology directory

optional arguments:
  -h, --help            show this help message and exit
  --always-pull         Pull latest images, even if they're available locally
                        (default: False)
  --namespace ns        Namespace to use when looking for images (default:
                        clusterdock)
  --network nw          Docker network to use (default: cluster)
  -o sys, --operating-system sys
                        Operating system to use for cluster nodes (default:
                        centos6.6)
  -r url, --registry url
                        Docker Registry from which to pull images (default:
                        None)

nodebase arguments:
  --node-disks map      Map of node names to block devices (default: None)

Node groups:
  --nodes node [node ...]
                        Nodes of the nodes group (default: ['node-1',
                        'node-2'])

When you’re done and want to clean up:

$ clusterdock manage nuke
2017-08-03 10:06:28 PM clusterdock.actions.manage INFO     Stopping and removing clusterdock containers ...
2017-08-03 10:06:30 PM clusterdock.actions.manage INFO     Removed user-defined networks ...