Swift in Kolla
==============

Overview
--------
Kolla can deploy a full working Swift setup in either a AIO or multi node setup.

Prerequisites
-------------
Before running Swift we need to generate "rings", which are binary compressed
files that at a high level let the various Swift services know where data is in
the cluster. We hope to automate this process in a future release.

Disks with a partition table (recommended)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Swift also expects block devices to be available for storage. To prepare a disk
for use as Swift storage device, a special partition name and filesystem label
need to be added.  So that Kolla can detect those disks and mount for services.

Follow the example below to add 3 disks for an AIO demo setup.

::

    # <WARNING ALL DATA ON DISK will be LOST!>
    index=0
    for d in sdc sdd sde; do
        parted /dev/${d} -s -- mklabel gpt mkpart KOLLA_SWIFT_DATA 1 -1
        sudo mkfs.xfs -f -L d${index} /dev/${d}1
        (( index++ ))
    done

For evaluation, loopback devices can be used in lieu of real disks:

::

    index=0
    for d in sdc sdd sde; do
        free_device=$(losetup -f)
        fallocate -l 1G /tmp/$d
        losetup $free_device /tmp/$d
        parted $free_device -s -- mklabel gpt mkpart KOLLA_SWIFT_DATA 1 -1
        sudo mkfs.xfs -f -L d${index} ${free_device}p1
        (( index++ ))
    done

Disks without a partition table
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Kolla also supports unpartitioned disk (filesystem on /dev/sdc instead of
/dev/sdc1) detection purely based on filesystem label. This is generally not a
recommended practice but can be helpful for Kolla to take over Swift deployment
already using disk like this.

Given hard disks with labels swd1, swd2, swd3, use the following settings in
ansible/roles/swift/defaults/main.yml

::

    swift_devices_match_mode: "prefix"
    swift_devices_name: "swd"

Rings
~~~~~

Run following commands locally to generate Rings for AIO demo setup. The
commands work with "disks with partition table" example listed above. Please
modify accordingly if your setup is different.

::

  export KOLLA_INTERNAL_ADDRESS=1.2.3.4
  export KOLLA_BASE_DISTRO=centos
  export KOLLA_INSTALL_TYPE=binary

  # Object ring
  docker run \
    -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
    kolla/${KOLLA_BASE_DISTRO}-${KOLLA_INSTALL_TYPE}-swift-base \
    swift-ring-builder /etc/kolla/config/swift/object.builder create 10 3 1

  for i in {0..2}; do
    docker run \
      -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
      kolla/${KOLLA_BASE_DISTRO}-${KOLLA_INSTALL_TYPE}-swift-base swift-ring-builder \
      /etc/kolla/config/swift/object.builder add r1z1-${KOLLA_INTERNAL_ADDRESS}:6000/d${i} 1;
  done

  # Account ring
  docker run \
    -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
    kolla/${KOLLA_BASE_DISTRO}-${KOLLA_INSTALL_TYPE}-swift-base \
    swift-ring-builder /etc/kolla/config/swift/account.builder create 10 3 1

  for i in {0..2}; do
    docker run \
      -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
      kolla/${KOLLA_BASE_DISTRO}-${KOLLA_INSTALL_TYPE}-swift-base swift-ring-builder \
      /etc/kolla/config/swift/account.builder add r1z1-${KOLLA_INTERNAL_ADDRESS}:6001/d${i} 1;
  done

  # Container ring
  docker run \
    -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
    kolla/${KOLLA_BASE_DISTRO}-${KOLLA_INSTALL_TYPE}-swift-base \
    swift-ring-builder /etc/kolla/config/swift/container.builder create 10 3 1

  for i in {0..2}; do
    docker run \
      -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
      kolla/${KOLLA_BASE_DISTRO}-${KOLLA_INSTALL_TYPE}-swift-base swift-ring-builder \
      /etc/kolla/config/swift/container.builder add r1z1-${KOLLA_INTERNAL_ADDRESS}:6002/d${i} 1;
  done

  for ring in object account container; do
    docker run \
      -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
      kolla/${KOLLA_BASE_DISTRO}-${KOLLA_INSTALL_TYPE}-swift-base swift-ring-builder \
      /etc/kolla/config/swift/${ring}.builder rebalance;
  done

Similar commands can be used for multinode, you will just need to run the 'add' step for each IP
in the cluster.

For more info, see
http://docs.openstack.org/kilo/install-guide/install/apt/content/swift-initial-rings.html

Deploying
---------
Enable Swift in /etc/kolla/globals.yml:

::

    enable_swift : "yes"

Once the rings are in place, deploying Swift is the same as any other Kolla Ansible service. Below
is the minimal command to bring up Swift AIO, and it's dependencies:

::

  ansible-playbook \
    -i ansible/inventory/all-in-one \
    -e @/etc/kolla/globals.yml \
    -e @etc/kolla/passwords.yml \
    ansible/site.yml \
    --tags=rabbitmq,mariadb,keystone,swift

Validation
----------
A very basic smoke test:

::

  $ swift stat
                            Account: AUTH_4c19d363b9cf432a80e34f06b1fa5749
                       Containers: 1
                          Objects: 0
                            Bytes: 0
  Containers in policy "policy-0": 1
     Objects in policy "policy-0": 0
       Bytes in policy "policy-0": 0
      X-Account-Project-Domain-Id: default
                      X-Timestamp: 1440168098.28319
                       X-Trans-Id: txf5a62b7d7fc541f087703-0055d73be7
                     Content-Type: text/plain; charset=utf-8
                    Accept-Ranges: bytes

  $ swift upload mycontainer README.rst
  README.md

  $ swift list
  mycontainer

  $ swift download mycontainer README.md
  README.md [auth 0.248s, headers 0.939s, total 0.939s, 0.006 MB/s]