Key value store
PX stores configuration metadata in a KVDB (key/value store), such as Etcd or Consul. If you have an existing KVDB, you may use that. If you want to set one up, see the etcd example for PX
- Follow the Swarm mode overview guide to run Docker in Swarm mode. PX requires a minimum of Docker version 1.10 to be installed.
- You must configure Docker to allow shared mounts propogation. Please follow these instructions to enable shared mount propogation. This is needed because PX runs as a container and it will be provisioning storage to other containers.
Identify storage devices
Portworx pools the storage devices on your server and creates a global capacity for containers.
Back up any data on storage devices that will be pooled. Storage devices will be reformatted!
To view the storage devices on your server, use the
# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda 202:0 0 8G 0 disk └─xvda1 202:1 0 8G 0 part / xvdb 202:16 0 64G 0 disk xvdc 202:32 0 64G 0 disk
Note that devices without the partition are shown under the TYPE column as part. This example has two non-root storage devices (/dev/xvdb, /dev/xvdc) that are candidates for storage devices.
Identify the storage devices you will be allocating to PX. If you are running in a heterogeneous environment, where different nodes have different drives use the
-a -f parameters instead of
Portworx can be deployed as a Swarm service.
$ docker service create --mount type=bind,src=/,dst=/media/host \ --mount type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \ --mode global \ --name portworx \ portworx/monitor -k etcd://etc.fake.net:2379 -x swarm -c test-cluster -a -f
To view status of the service:
$ docker service ps portworx
The arguments that are given to the service above (-k, -c etc) are described below.
The following arguments are provided to the PX daemon:
|(Required) Specifies the unique name for the Portworx cluster|
|(Required) Points to your key value database, such as an etcd cluster or a consul cluster.|
|(Optional if -a is used) Specifies the various drives that PX should use for storing the data.|
|(Optional) Specifies the data interface.|
|(Optional) Specifies the management interface.|
|(Optional) Instructs PX to use an unmounted drive even if it has a filesystem on it.|
|(Optional) Instructs PX to use any available, unused and unmounted drive.,PX will never use a drive that is mounted.|
|(Optional) Instructs PX to use any available, unused and unmounted drives or partitions. PX will never use a drive or partition that is mounted.|
|(Optional) Specifies the scheduler being used in the environment. “swarm” for Docker Swarm.|
|(Optional) Username and password for ETCD authentication in the form user:password|
|(Optional) Location of CA file for ETCD authentication.|
|(Optional) Location of certificate for ETCD authentication.|
|(Optional) Location of certificate key for ETCD authentication.|
|(Optional) ACL token value used for Consul authentication.|
|(Optional) Portworx lighthouse token for cluster.|
Portworx is deployed as a
Global Service. Therefore it automatically scales as you grow your Swarm cluster. There are no additional requirements to install Portworx on the new nodes.
Access the pxctl CLI
After Portworx is running, you can create, delete & manage storage volumes through the Docker volume commands or the pxctl command line tool.
For more on using pxctl, see the CLI Reference.
A useful pxctl command is
pxctl status The following sample output of
pxctl status shows that the global capacity for Docker containers is 128 GB.
# /opt/pwx/bin/pxctl status Status: PX is operational Node ID: 0a0f1f22-374c-4082-8040-5528686b42be IP: 172.31.50.10 Local Storage Pool: 2 pools POOL IO_PRIORITY SIZE USED STATUS ZONE REGION 0 LOW 64 GiB 1.1 GiB Online b us-east-1 1 LOW 128 GiB 1.1 GiB Online b us-east-1 Local Storage Devices: 2 devices Device Path Media Type Size Last-Scan 0:1 /dev/xvdf STORAGE_MEDIUM_SSD 64 GiB 10 Dec 16 20:07 UTC 1:1 /dev/xvdi STORAGE_MEDIUM_SSD 128 GiB 10 Dec 16 20:07 UTC total - 192 GiB Cluster Summary Cluster ID: 55f8a8c6-3883-4797-8c34-0cfe783d9890 IP ID Used Capacity Status 172.31.50.10 0a0f1f22-374c-4082-8040-5528686b42be 2.2 GiB 192 GiB Online (This node) Global Storage Pool Total Used : 2.2 GiB Total Capacity : 192 GiB
Now that you have Portworx up, let’s look at an example of running stateful application with Portworx and Swarm!
Following command will perform upgrade with the latest image.
$ docker service update --force portworx
$ docker service rm portworx
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During uninstall, the configuration files (/etc/pwx/config.json and /etc/pwx/.private.json) are not deleted. If you delete /etc/pwx/.private.json, Portworx will lose access to data volumes.