Why OCI

Running Portworx as a runC container eliminates any cyclical dependencies between a Docker container consuming storage from the Portworx container. It also enables you to run your Linux containers without a Docker daemon completely, while still getting all of the advantages of a Linux container and cloud native storage from Portworx.

To install and configure PX to run directly with OCI/runC, please use the configuration steps described in this section.

If you are already running PX as a docker container and need to migrate to OCI, following the migration steps.

Note:
It is highly recommended to include the steps outlined in this document in a systemd unit file, so that PX starts up correctly on every reboot of a host. An example unit file is shown below.

Install

Prerequisites

  • SYSTEMD: The installation below assumes the systemd package is installed on your system (i.e. systemctl command works).
    • Note, if you are running Ubuntu 16.04, CentoOS 7 or CoreOS v94 (or newer) the “systemd” is already installed and no actions will be required.
  • SCHEDULERS: If you are installing PX into Kubernetes or Mesosphere DC/OS cluster, we recommend to install the scheduler-specific Portworx package, which provides tighter integration, and better overall user experience.
  • FIREWALL: Ensure ports 9001-9015 are open between the cluster nodes that will run Portworx.
  • NTP: Ensure all nodes running PX are time-synchronized, and NTP service is configured and running.
  • KVDB: Please have a clustered key-value database (etcd or consul) installed and ready. For etcd installation instructions refer this doc.
  • STORAGE: At least one of the PX-nodes should have extra storage available, in a form of unformatted partition or a disk-drive.
    Also please note that storage devices explicitly given to Portworx (ie. px-runc ... -s /dev/sdb -s /dev/sdc3) will be automatically formatted by PX.

The installation and setup of PX OCI bundle is a 3-step process:

  1. Install PX OCI bits
  2. Configure PX OCI
  3. Enable and start Portworx service

Step 1: Install the PX OCI bundle

Portworx provides a Docker based installation utility to help deploy the PX OCI bundle. This bundle can be installed by running the following Docker container on your host system:

To get the 1.4 release
latest_stable=$(curl -fsSL 'https://install.portworx.com/1.4/?type=dock&stork=false' | awk '/image: / {print $2}')

# Download OCI bits (reminder, you will still need to run `px-runc install ..` after this step)
sudo docker run --entrypoint /runc-entry-point.sh \
    --rm -i --privileged=true \
    -v /opt/pwx:/opt/pwx -v /etc/pwx:/etc/pwx \
    $latest_stable
To get the 1.3 release
latest_stable=$(curl -fsSL 'https://install.portworx.com/1.3/?type=dock&stork=false' | awk '/image: / {print $2}')

# Download OCI bits (reminder, you will still need to run `px-runc install ..` after this step)
sudo docker run --entrypoint /runc-entry-point.sh \
    --rm -i --privileged=true \
    -v /opt/pwx:/opt/pwx -v /etc/pwx:/etc/pwx \
    $latest_stable
To get the 1.2 release
latest_stable=$(curl -fsSL 'https://install.portworx.com/1.2/?type=dock&stork=false' | awk '/image: / {print $2}')

# Download OCI bits (reminder, you will still need to run `px-runc install ..` after this step)
sudo docker run --entrypoint /runc-entry-point.sh \
    --rm -i --privileged=true \
    -v /opt/pwx:/opt/pwx -v /etc/pwx:/etc/pwx \
    $latest_stable

Note:
Running the PX OCI bundle does not require Docker, but Docker will still be required to install the PX OCI bundle. If you do not have Docker installed on your target hosts, you can download this Docker package and extract it to a root tar ball and manually install the OCI bundle.

Step 2: Configure PX under runC

Now that you have downloaded and installed the PX OCI bundle, you can use the the px-runc install command from the bundle to configure systemd to start PX runC.

The px-runc command is a helper-tool that does the following:

  1. prepares the OCI directory for runC
  2. prepares the runC configuration for PX
  3. used by systemd to start the PX OCI bundle

Installation example:

#  Basic installation

sudo /opt/pwx/bin/px-runc install -c MY_CLUSTER_ID \
    -k etcd://myetc.company.com:2379 \
    -s /dev/xvdb -s /dev/xvdc 
Command-line arguments

Options

-c                        [REQUIRED] Specifies the cluster ID that this PX instance is to join
-k                        [REQUIRED] Points to your key value database, such as an etcd cluster or a consul cluster
-s                        [REQUIRED unless -a is used] Specifies the various drives that PX should use for storing the data
-e key=value              [OPTIONAL] Specify extra environment variables
-v <dir:dir[:shared,ro]>  [OPTIONAL] Specify extra mounts
-d <ethX>                 [OPTIONAL] Specify the data network interface
-m <ethX>                 [OPTIONAL] Specify the management network interface
-z                        [OPTIONAL] Instructs PX to run in zero storage mode
-f                        [OPTIONAL] Instructs PX to use an unmounted drive even if it has a filesystem on it
-a                        [OPTIONAL] Instructs PX to use any available, unused and unmounted drives
-A                        [OPTIONAL] Instructs PX to use any available, unused and unmounted drives or partitions
-j                        [OPTIONAL] Specifies a journal device for PX.  Specify a persistent drive like /dev/sdc or use auto (recommended)
-x <swarm|kubernetes>     [OPTIONAL] Specify scheduler being used in the environment
-r <portnumber>           [OPTIONAL] Specifies the portnumber from which PX will start consuming. Ex: 9001 means 9001-9020
  • additional PX-OCI -specific options:
-oci <dir>                [OPTIONAL] Specify OCI directory (default: /opt/pwx/oci)
-sysd <file>              [OPTIONAL] Specify SystemD service file (default: /etc/systemd/system/portworx.service)

KVDB options

-userpwd <user:passwd>    [OPTIONAL] Username and password for ETCD authentication
-ca <file>                [OPTIONAL] Specify location of CA file for ETCD authentication
-cert <file>              [OPTIONAL] Specify location of certificate for ETCD authentication
-key <file>               [OPTIONAL] Specify location of certificate key for ETCD authentication
-acltoken <token>         [OPTIONAL] ACL token value used for Consul authentication

Secrets options

-secret_type <aws|kvdb|vault>   [OPTIONAL] Specify the secret type to be used by Portworx for cloudsnap and encryption features.
-cluster_secret_key <id>        [OPTIONAL] Specify the cluster wide secret key to be used when using AWS KMS or Vault for volume encryption.

Environment variables

PX_HTTP_PROXY         [OPTIONAL] If running behind an HTTP proxy, set the PX_HTTP_PROXY variables to your HTTP proxy.
PX_HTTPS_PROXY        [OPTIONAL] If running behind an HTTPS proxy, set the PX_HTTPS_PROXY variables to your HTTPS proxy.
PX_ENABLE_CACHE_FLUSH [OPTIONAL] Enable cache flush deamon. Set PX_ENABLE_CACHE_FLUSH=true.
PX_ENABLE_NFS         [OPTIONAL] Enable the PX NFS daemon. Set PX_ENABLE_NFS=true.

NOTE: Setting environment variables can be done using the -e option, during PX-OCI or PX Docker Container command line install (e.g. add -e VAR=VALUE option).

# Example PX-OCI config with extra "PX_ENABLE_CACHE_FLUSH" environment variable
$ sudo /opt/pwx/bin/px-runc install -e PX_ENABLE_CACHE_FLUSH=yes \
    -c MY_CLUSTER_ID -k etcd://myetc.company.com:2379 -s /dev/xvdb
Examples

Using etcd:

px-runc install -k etcd://my.company.com:2379 -c MY_CLUSTER_ID -s /dev/sdc -s /dev/sdb2 
px-runc install -k etcd://70.0.1.65:2379 -c MY_CLUSTER_ID -s /dev/sdc -d enp0s8 -m enp0s8 

Using consul:

px-runc install -k consul://my.company.com:8500 -c MY_CLUSTER_ID -s /dev/sdc -s /dev/sdb2 
px-runc install -k consul://70.0.2.65:8500 -c MY_CLUSTER_ID -s /dev/sdc -d enp0s8 -m enp0s8 
Modifying the PX configuration

After the initial installation, you can modify the PX configuration file at /etc/pwx/config.json (see details) and restart Portworx using systemctl restart portworx.

Step 3: Starting PX runC

Once you install the PX OCI bundle and systemd configuration from the steps above, you can start and control PX runC directly via systemd:

# Reload systemd configurations, enable and start Portworx service
sudo systemctl daemon-reload
sudo systemctl enable portworx
sudo systemctl start portworx
Advanced usage: Interactive/Foreground mode

Alternatively, one might prefer to first start the PX interactively (for example, to verify the configuration parameters were OK and the startup was successful), and then install it as a service:

# Invoke PX interactively, abort with CTRL-C when confirmed it's running:
sudo /opt/pwx/bin/px-runc run -c MY_CLUSTER_ID \
    -k etcd://myetc.company.com:2379 \
    -s /dev/xvdb

[...]
> time="2017-08-18T20:34:23Z" level=info msg="Cloud backup schedules setup done"
> time="2017-08-18T20:34:23Z" level=info msg="Starting REST service on socket : /run/docker/plugins/pxd.sock"
> time="2017-08-18T20:34:23Z" level=info msg="Starting REST service on socket : /var/lib/osd/driver/pxd.sock"
> time="2017-08-18T20:34:23Z" level=info msg="PX is ready on Node: 53f5e87b... CLI accessible at /opt/pwx/bin/pxctl."
[ hit Ctrl-C ]

Upgrading the PX OCI bundle

To upgrade the OCI bundle, simply re-run the installation Step 1 with the --upgrade option. After the upgrade, you will need to restart the Portworx service.

latest_stable=$(curl -fsSL 'https://install.portworx.com?type=dock&stork=false' | awk '/image: / {print $2}')
sudo docker run --entrypoint /runc-entry-point.sh \
    --rm -i --privileged=true \
    -v /opt/pwx:/opt/pwx -v /etc/pwx:/etc/pwx \
    $latest_stable --upgrade
sudo systemctl restart portworx

Uninstalling the PX OCI bundle

To uninstall the PX OCI bundle, please run the following:

# 1: Remove systemd service (if any)
sudo systemctl stop portworx
sudo systemctl disable portworx
sudo rm -f /etc/systemd/system/portworx*.service

# NOTE: if the steps below fail, please reboot the node, and repeat the steps 2..5

# 2: Unmount oci (if required)
grep -q '/opt/pwx/oci /opt/pwx/oci' /proc/self/mountinfo && sudo umount /opt/pwx/oci

# 3: Remove binary files
sudo rm -fr /opt/pwx

# 4: [OPTIONAL] Remove configuration files. Doing this means UNRECOVERABLE DATA LOSS.
sudo rm -fr /etc/pwx

Migrating from PX-Containers to PX-OCI

If you already had PX running as a Docker container and now want to upgrade to runC, follow these instructions:

Step 1: Download and deploy the PX OCI bundle

latest_stable=$(curl -fsSL 'https://install.portworx.com?type=dock&stork=false' | awk '/image: / {print $2}')

sudo docker run --entrypoint /runc-entry-point.sh \
    --rm -i --privileged=true \
    -v /opt/pwx:/opt/pwx -v /etc/pwx:/etc/pwx \
    $latest_stable

Step 2: Inspect your existing PX-Containers, record arguments and any custom mounts:

Inspect the mounts so these can be provided to the runC installer.

Note:
Mounts for /dev, /proc, /sys, /etc/pwx, /opt/pwx, /run/docker/plugins, /usr/src, /var/cores, /var/lib/osd, /var/run/docker.sock can be safely ignored (omitted).
Custom mounts will need to be passed to PX-OCI in the next step, using the following notation:
px-runc install -v <Source1>:<Destination1>[:<Propagation1 if shared,ro>] ...

# Inspect Arguments
sudo docker inspect --format '{{.Args}}' px-enterprise 
[ -c MY_CLUSTER_ID -k etcd://myetc.company.com:2379 -s /dev/xvdb ]

# Inspect Mounts
sudo docker inspect --format '{{json .Mounts}}' px-enterprise | python -mjson.tool 
[...]
    {
        "Destination": "/var/lib/kubelet",
        "Mode": "shared",
        "Propagation": "shared",
        "RW": true,
        "Source": "/var/lib/kubelet",
        "Type": "bind"
    },

Step 3: Install the PX OCI bundle

Remember to use the arguments from your PX Docker installation.

sudo /opt/pwx/bin/px-runc install -c MY_CLUSTER_ID \
    -k etcd://myetc.company.com:2379 \
    -s /dev/xvdb

Step 4: Stop PX-Container and start PX runC

# Disable and stop PX Docker container

sudo docker update --restart=no px-enterprise
sudo docker stop px-enterprise

# Set up and start PX OCI as systemd service

sudo systemctl daemon-reload
sudo systemctl enable portworx
sudo systemctl start portworx

Once you confirm the PX Container -> PX runC upgrade worked, you can permanently delete the px-enterprise docker container.

Logging and Log files

The systemd(1) uses a very flexible logging mechanism, where logs can be viewed using the journalctl command.

For example:

# Monitor the Portworx logs
sudo journalctl -f -u portworx

# Get a slice of Portworx logs
sudo journalctl -u portworx --since 09:00 --until "1 hour ago"

However, if you prefer to capture Portworx service logs in a separate log file, you will need to modify your host system as follows:

# Create a rsyslogd(8) rule to separate out the PX logs:
sudo cat > /etc/rsyslog.d/23-px-runc.conf << _EOF
:programname, isequal, "px-runc" /var/log/portworx.log
& stop
_EOF

# Create logrotate(8) configuration to periodically rotate the logs:
sudo cat > /etc/logrotate.d/portworx << _EOF
/var/log/portworx.log {
    daily
    rotate 7
    compress
    notifempty
    missingok
    postrotate
        /usr/bin/pkill -HUP syslogd 2> /dev/null || true
    endscript
}
_EOF

# Signal syslogd to reload the configurations:
sudo pkill -HUP syslogd