openstack/swift
Code Issues Proposed changes
7bff34c5d3
swift/doc/source/development_saio.rst
Michele Valsecchi 875a142980 docs: Encourage usage of UUID inside /etc/fstab in examples 
Update doc examples to use explicit UUID of devices, instead of using
unstable device names.

Change-Id: I3a2eb7bbe4b4091d2567897904d939df1df6b251
Closes-Bug: #1817966
2020-04-04 19:03:12 +09:00

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.. _saio:
=======================
SAIO (Swift All In One)
=======================
.. note::
This guide assumes an existing Linux server. A physical machine or VM will
work. We recommend configuring it with at least 2GB of memory and 40GB of
storage space. We recommend using a VM in order to isolate Swift and its
dependencies from other projects you may be working on.
---------------------------------------------
Instructions for setting up a development VM
---------------------------------------------
This section documents setting up a virtual machine for doing Swift
development. The virtual machine will emulate running a four node Swift
cluster. To begin:
* Get a Linux system server image, this guide will cover:
* Ubuntu 14.04, 16.04 LTS
* CentOS 7
* Fedora
* OpenSuse
- Create guest virtual machine from the image.
----------------------------
What's in a <your-user-name>
----------------------------
Much of the configuration described in this guide requires escalated
administrator (``root``) privileges; however, we assume that administrator logs
in as an unprivileged user and can use ``sudo`` to run privileged commands.
Swift processes also run under a separate user and group, set by configuration
option, and referenced as ``<your-user-name>:<your-group-name>``. The default user
is ``swift``, which may not exist on your system. These instructions are
intended to allow a developer to use his/her username for
``<your-user-name>:<your-group-name>``.
.. note::
For OpenSuse users, a user's primary group is ``users``, so you have 2 options:
* Change ``${USER}:${USER}`` to ``${USER}:users`` in all references of this guide; or
* Create a group for your username and add yourself to it::
sudo groupadd ${USER} && sudo gpasswd -a ${USER} ${USER} && newgrp ${USER}
-----------------------
Installing dependencies
-----------------------
* On ``apt`` based systems::
sudo apt-get update
sudo apt-get install curl gcc memcached rsync sqlite3 xfsprogs \
git-core libffi-dev python-setuptools \
liberasurecode-dev libssl-dev
sudo apt-get install python-coverage python-dev python-nose \
python-xattr python-eventlet \
python-greenlet python-pastedeploy \
python-netifaces python-pip python-dnspython \
python-mock
* On ``CentOS`` (requires additional repositories)::
sudo yum update
sudo yum install epel-release
sudo yum-config-manager --enable epel extras
sudo yum install centos-release-openstack-train
sudo yum install curl gcc memcached rsync sqlite xfsprogs git-core \
libffi-devel xinetd liberasurecode-devel \
openssl-devel python-setuptools \
python-coverage python-devel python-nose \
pyxattr python-eventlet \
python-greenlet python-paste-deploy \
python-netifaces python-pip python-dns \
python-mock
* On ``Fedora``::
sudo dnf update
sudo dnf install curl gcc memcached rsync-daemon sqlite xfsprogs git-core \
libffi-devel xinetd liberasurecode-devel \
openssl-devel python-setuptools \
python-coverage python-devel python-nose \
pyxattr python-eventlet \
python-greenlet python-paste-deploy \
python-netifaces python-pip python-dns \
python-mock
* On ``OpenSuse``::
sudo zypper install curl gcc memcached rsync sqlite3 xfsprogs git-core \
libffi-devel liberasurecode-devel python2-setuptools \
libopenssl-devel
sudo zypper install python2-coverage python-devel python2-nose \
python-xattr python-eventlet python2-greenlet \
python2-netifaces python2-pip python2-dnspython \
python2-mock
.. note::
This installs necessary system dependencies and *most* of the python
dependencies. Later in the process setuptools/distribute or pip will install
and/or upgrade packages.
-------------------
Configuring storage
-------------------
Swift requires some space on XFS filesystems to store data and run tests.
Choose either :ref:`partition-section` or :ref:`loopback-section`.
.. _partition-section:
Using a partition for storage
=============================
If you are going to use a separate partition for Swift data, be sure to add
another device when creating the VM, and follow these instructions:
.. note::
The disk does not have to be ``/dev/sdb1`` (for example, it could be
``/dev/vdb1``) however the mount point should still be ``/mnt/sdb1``.
#. Set up a single partition on the device (this will wipe the drive)::
sudo parted /dev/sdb mklabel msdos mkpart p xfs 0% 100%
#. Create an XFS file system on the partition::
sudo mkfs.xfs /dev/sdb1
#. Find the UUID of the new partition::
sudo blkid
#. Edit ``/etc/fstab`` and add::
UUID="<UUID-from-output-above>" /mnt/sdb1 xfs noatime,nodiratime,logbufs=8 0 0
#. Create the Swift data mount point and test that mounting works::
sudo mkdir /mnt/sdb1
sudo mount -a
#. Next, skip to :ref:`common-dev-section`.
.. _loopback-section:
Using a loopback device for storage
===================================
If you want to use a loopback device instead of another partition, follow
these instructions:
#. Create the file for the loopback device::
sudo mkdir -p /srv
sudo truncate -s 1GB /srv/swift-disk
sudo mkfs.xfs /srv/swift-disk
Modify size specified in the ``truncate`` command to make a larger or
smaller partition as needed.
#. Edit `/etc/fstab` and add::
/srv/swift-disk /mnt/sdb1 xfs loop,noatime,nodiratime,logbufs=8 0 0
#. Create the Swift data mount point and test that mounting works::
sudo mkdir /mnt/sdb1
sudo mount -a
.. _common-dev-section:
Common Post-Device Setup
========================
#. Create the individualized data links::
sudo mkdir /mnt/sdb1/1 /mnt/sdb1/2 /mnt/sdb1/3 /mnt/sdb1/4
sudo chown ${USER}:${USER} /mnt/sdb1/*
for x in {1..4}; do sudo ln -s /mnt/sdb1/$x /srv/$x; done
sudo mkdir -p /srv/1/node/sdb1 /srv/1/node/sdb5 \
/srv/2/node/sdb2 /srv/2/node/sdb6 \
/srv/3/node/sdb3 /srv/3/node/sdb7 \
/srv/4/node/sdb4 /srv/4/node/sdb8
sudo mkdir -p /var/run/swift
sudo mkdir -p /var/cache/swift /var/cache/swift2 \
/var/cache/swift3 /var/cache/swift4
sudo chown -R ${USER}:${USER} /var/run/swift
sudo chown -R ${USER}:${USER} /var/cache/swift*
# **Make sure to include the trailing slash after /srv/$x/**
for x in {1..4}; do sudo chown -R ${USER}:${USER} /srv/$x/; done
.. note::
We create the mount points and mount the loopback file under
/mnt/sdb1. This file will contain one directory per simulated Swift node,
each owned by the current Swift user.
We then create symlinks to these directories under /srv.
If the disk sdb or loopback file is unmounted, files will not be written under
/srv/\*, because the symbolic link destination /mnt/sdb1/* will not
exist. This prevents disk sync operations from writing to the root
partition in the event a drive is unmounted.
#. Restore appropriate permissions on reboot.
* On traditional Linux systems, add the following lines to ``/etc/rc.local`` (before the ``exit 0``)::
mkdir -p /var/cache/swift /var/cache/swift2 /var/cache/swift3 /var/cache/swift4
chown <your-user-name>:<your-group-name> /var/cache/swift*
mkdir -p /var/run/swift
chown <your-user-name>:<your-group-name> /var/run/swift
* On CentOS and Fedora we can use systemd (rc.local is deprecated)::
cat << EOF |sudo tee /etc/tmpfiles.d/swift.conf
d /var/cache/swift 0755 ${USER} ${USER} - -
d /var/cache/swift2 0755 ${USER} ${USER} - -
d /var/cache/swift3 0755 ${USER} ${USER} - -
d /var/cache/swift4 0755 ${USER} ${USER} - -
d /var/run/swift 0755 ${USER} ${USER} - -
EOF
* On OpenSuse place the lines in ``/etc/init.d/boot.local``.
.. note::
On some systems the rc file might need to be an executable shell script.
Creating an XFS tmp dir
-----------------------
Tests require having a directory available on an XFS filesystem. By default the
tests use ``/tmp``, however this can be pointed elsewhere with the ``TMPDIR``
environment variable.
.. note::
If your root filesystem is XFS, you can skip this section if ``/tmp`` is
just a directory and not a mounted tmpfs. Or you could simply point to any
existing directory owned by your user by specifying it with the ``TMPDIR``
environment variable.
If your root filesystem is not XFS, you should create a loopback device,
format it with XFS and mount it. You can mount it over ``/tmp`` or to
another location and specify it with the ``TMPDIR`` environment variable.
* Create the file for the tmp loopback device::
sudo mkdir -p /srv
sudo truncate -s 1GB /srv/swift-tmp # create 1GB file for XFS in /srv
sudo mkfs.xfs /srv/swift-tmp
* To mount the tmp loopback device at ``/tmp``, do the following::
sudo mount -o loop,noatime,nodiratime /srv/swift-tmp /tmp
sudo chmod -R 1777 /tmp
* To persist this, edit and add the following to ``/etc/fstab``::
/srv/swift-tmp /tmp xfs rw,noatime,nodiratime,attr2,inode64,noquota 0 0
* To mount the tmp loopback at an alternate location (for example, ``/mnt/tmp``),
do the following::
sudo mkdir -p /mnt/tmp
sudo mount -o loop,noatime,nodiratime /srv/swift-tmp /mnt/tmp
sudo chown ${USER}:${USER} /mnt/tmp
* To persist this, edit and add the following to ``/etc/fstab``::
/srv/swift-tmp /mnt/tmp xfs rw,noatime,nodiratime,attr2,inode64,noquota 0 0
* Set your ``TMPDIR`` environment dir so that Swift looks in the right location::
export TMPDIR=/mnt/tmp
echo "export TMPDIR=/mnt/tmp" >> $HOME/.bashrc
----------------
Getting the code
----------------
#. Check out the python-swiftclient repo::
cd $HOME; git clone https://github.com/openstack/python-swiftclient.git
#. Build a development installation of python-swiftclient::
cd $HOME/python-swiftclient; sudo python setup.py develop; cd -
Ubuntu 12.04 users need to install python-swiftclient's dependencies before the installation of
python-swiftclient. This is due to a bug in an older version of setup tools::
cd $HOME/python-swiftclient; sudo pip install -r requirements.txt; sudo python setup.py develop; cd -
#. Check out the Swift repo::
git clone https://github.com/openstack/swift.git
#. Build a development installation of Swift::
cd $HOME/swift; sudo pip install --no-binary cryptography -r requirements.txt; sudo python setup.py develop; cd -
.. note::
Due to a difference in how ``libssl.so`` is named in OpenSuse vs. other Linux distros the
wheel/binary won't work; thus we use ``--no-binary cryptography`` to build ``cryptography``
locally.
Fedora users might have to perform the following if development
installation of Swift fails::
sudo pip install -U xattr
#. Install Swift's test dependencies::
cd $HOME/swift; sudo pip install -r test-requirements.txt
----------------
Setting up rsync
----------------
#. Create ``/etc/rsyncd.conf``::
sudo cp $HOME/swift/doc/saio/rsyncd.conf /etc/
sudo sed -i "s/<your-user-name>/${USER}/" /etc/rsyncd.conf
Here is the default ``rsyncd.conf`` file contents maintained in the repo
that is copied and fixed up above:
.. literalinclude:: /../saio/rsyncd.conf
:language: ini
#. Enable rsync daemon
* On Ubuntu, edit the following line in ``/etc/default/rsync``::
RSYNC_ENABLE=true
.. note::
You might have to create the file to perform the edits.
* On CentOS and Fedora, enable the systemd service::
sudo systemctl enable rsyncd
* On OpenSuse, nothing needs to happen here.
#. On platforms with SELinux in ``Enforcing`` mode, either set to ``Permissive``::
sudo setenforce Permissive
sudo sed -i 's/^SELINUX=.*/SELINUX=permissive/g' /etc/selinux/config
Or just allow rsync full access::
sudo setsebool -P rsync_full_access 1
#. Start the rsync daemon
* On Ubuntu 14.04, run::
sudo service rsync restart
* On Ubuntu 16.04, run::
sudo systemctl enable rsync
sudo systemctl start rsync
* On CentOS, Fedora and OpenSuse, run::
sudo systemctl start rsyncd
* On other xinetd based systems simply run::
sudo service xinetd restart
#. Verify rsync is accepting connections for all servers::
rsync rsync://pub@localhost/
You should see the following output from the above command::
account6012
account6022
account6032
account6042
container6011
container6021
container6031
container6041
object6010
object6020
object6030
object6040
------------------
Starting memcached
------------------
On non-Ubuntu distros you need to ensure memcached is running::
sudo service memcached start
sudo chkconfig memcached on
or::
sudo systemctl enable memcached
sudo systemctl start memcached
The tempauth middleware stores tokens in memcached. If memcached is not
running, tokens cannot be validated, and accessing Swift becomes impossible.
---------------------------------------------------
Optional: Setting up rsyslog for individual logging
---------------------------------------------------
Fedora and OpenSuse may not have rsyslog installed, in which case you will need
to install it if you want to use individual logging.
#. Install rsyslogd
* On Fedora::
sudo dnf install rsyslog
* On OpenSuse::
sudo zypper install rsyslog
#. Install the Swift rsyslogd configuration::
sudo cp $HOME/swift/doc/saio/rsyslog.d/10-swift.conf /etc/rsyslog.d/
Be sure to review that conf file to determine if you want all the logs
in one file vs. all the logs separated out, and if you want hourly logs
for stats processing. For convenience, we provide its default contents
below:
.. literalinclude:: /../saio/rsyslog.d/10-swift.conf
:language: ini
#. Edit ``/etc/rsyslog.conf`` and make the following change (usually in the
"GLOBAL DIRECTIVES" section)::
$PrivDropToGroup adm
#. If using hourly logs (see above) perform::
sudo mkdir -p /var/log/swift/hourly
Otherwise perform::
sudo mkdir -p /var/log/swift
#. Setup the logging directory and start syslog:
* On Ubuntu::
sudo chown -R syslog.adm /var/log/swift
sudo chmod -R g+w /var/log/swift
sudo service rsyslog restart
* On CentOS, Fedora and OpenSuse::
sudo chown -R root:adm /var/log/swift
sudo chmod -R g+w /var/log/swift
sudo systemctl restart rsyslog
sudo systemctl enable rsyslog
---------------------
Configuring each node
---------------------
After performing the following steps, be sure to verify that Swift has access
to resulting configuration files (sample configuration files are provided with
all defaults in line-by-line comments).
#. Optionally remove an existing swift directory::
sudo rm -rf /etc/swift
#. Populate the ``/etc/swift`` directory itself::
cd $HOME/swift/doc; sudo cp -r saio/swift /etc/swift; cd -
sudo chown -R ${USER}:${USER} /etc/swift
#. Update ``<your-user-name>`` references in the Swift config files::
find /etc/swift/ -name \*.conf | xargs sudo sed -i "s/<your-user-name>/${USER}/"
The contents of the configuration files provided by executing the above
commands are as follows:
#. ``/etc/swift/swift.conf``
.. literalinclude:: /../saio/swift/swift.conf
:language: ini
#. ``/etc/swift/proxy-server.conf``
.. literalinclude:: /../saio/swift/proxy-server.conf
:language: ini
#. ``/etc/swift/object-expirer.conf``
.. literalinclude:: /../saio/swift/object-expirer.conf
:language: ini
#. ``/etc/swift/container-reconciler.conf``
.. literalinclude:: /../saio/swift/container-reconciler.conf
:language: ini
#. ``/etc/swift/container-sync-realms.conf``
.. literalinclude:: /../saio/swift/container-sync-realms.conf
:language: ini
#. ``/etc/swift/account-server/1.conf``
.. literalinclude:: /../saio/swift/account-server/1.conf
:language: ini
#. ``/etc/swift/container-server/1.conf``
.. literalinclude:: /../saio/swift/container-server/1.conf
:language: ini
#. ``/etc/swift/object-server/1.conf``
.. literalinclude:: /../saio/swift/object-server/1.conf
:language: ini
#. ``/etc/swift/account-server/2.conf``
.. literalinclude:: /../saio/swift/account-server/2.conf
:language: ini
#. ``/etc/swift/container-server/2.conf``
.. literalinclude:: /../saio/swift/container-server/2.conf
:language: ini
#. ``/etc/swift/object-server/2.conf``
.. literalinclude:: /../saio/swift/object-server/2.conf
:language: ini
#. ``/etc/swift/account-server/3.conf``
.. literalinclude:: /../saio/swift/account-server/3.conf
:language: ini
#. ``/etc/swift/container-server/3.conf``
.. literalinclude:: /../saio/swift/container-server/3.conf
:language: ini
#. ``/etc/swift/object-server/3.conf``
.. literalinclude:: /../saio/swift/object-server/3.conf
:language: ini
#. ``/etc/swift/account-server/4.conf``
.. literalinclude:: /../saio/swift/account-server/4.conf
:language: ini
#. ``/etc/swift/container-server/4.conf``
.. literalinclude:: /../saio/swift/container-server/4.conf
:language: ini
#. ``/etc/swift/object-server/4.conf``
.. literalinclude:: /../saio/swift/object-server/4.conf
:language: ini
.. _setup_scripts:
------------------------------------
Setting up scripts for running Swift
------------------------------------
#. Copy the SAIO scripts for resetting the environment::
mkdir -p $HOME/bin
cd $HOME/swift/doc; cp saio/bin/* $HOME/bin; cd -
chmod +x $HOME/bin/*
#. Edit the ``$HOME/bin/resetswift`` script
The template ``resetswift`` script looks like the following:
.. literalinclude:: /../saio/bin/resetswift
:language: bash
If you did not set up rsyslog for individual logging, remove the ``find
/var/log/swift...`` line::
sed -i "/find \/var\/log\/swift/d" $HOME/bin/resetswift
#. Install the sample configuration file for running tests::
cp $HOME/swift/test/sample.conf /etc/swift/test.conf
The template ``test.conf`` looks like the following:
.. literalinclude:: /../../test/sample.conf
:language: ini
-----------------------------------------
Configure environment variables for Swift
-----------------------------------------
#. Add an environment variable for running tests below::
echo "export SWIFT_TEST_CONFIG_FILE=/etc/swift/test.conf" >> $HOME/.bashrc
#. Be sure that your ``PATH`` includes the ``bin`` directory::
echo "export PATH=${PATH}:$HOME/bin" >> $HOME/.bashrc
#. If you are using a loopback device for Swift Storage, add an environment var
to substitute ``/dev/sdb1`` with ``/srv/swift-disk``::
echo "export SAIO_BLOCK_DEVICE=/srv/swift-disk" >> $HOME/.bashrc
#. If you are using a device other than ``/dev/sdb1`` for Swift storage (for
example, ``/dev/vdb1``), add an environment var to substitute it::
echo "export SAIO_BLOCK_DEVICE=/dev/vdb1" >> $HOME/.bashrc
#. If you are using a location other than ``/tmp`` for Swift tmp data (for
example, ``/mnt/tmp``), add ``TMPDIR`` environment var to set it::
export TMPDIR=/mnt/tmp
echo "export TMPDIR=/mnt/tmp" >> $HOME/.bashrc
#. Source the above environment variables into your current environment::
. $HOME/.bashrc
--------------------------
Constructing initial rings
--------------------------
#. Construct the initial rings using the provided script::
remakerings
The ``remakerings`` script looks like the following:
.. literalinclude:: /../saio/bin/remakerings
:language: bash
You can expect the output from this command to produce the following. Note
that 3 object rings are created in order to test storage policies and EC in
the SAIO environment. The EC ring is the only one with all 8 devices.
There are also two replication rings, one for 3x replication and another
for 2x replication, but those rings only use 4 devices:
.. code-block:: console
Device d0r1z1-127.0.0.1:6010R127.0.0.1:6010/sdb1_"" with 1.0 weight got id 0
Device d1r1z2-127.0.0.2:6020R127.0.0.2:6020/sdb2_"" with 1.0 weight got id 1
Device d2r1z3-127.0.0.3:6030R127.0.0.3:6030/sdb3_"" with 1.0 weight got id 2
Device d3r1z4-127.0.0.4:6040R127.0.0.4:6040/sdb4_"" with 1.0 weight got id 3
Reassigned 3072 (300.00%) partitions. Balance is now 0.00. Dispersion is now 0.00
Device d0r1z1-127.0.0.1:6010R127.0.0.1:6010/sdb1_"" with 1.0 weight got id 0
Device d1r1z2-127.0.0.2:6020R127.0.0.2:6020/sdb2_"" with 1.0 weight got id 1
Device d2r1z3-127.0.0.3:6030R127.0.0.3:6030/sdb3_"" with 1.0 weight got id 2
Device d3r1z4-127.0.0.4:6040R127.0.0.4:6040/sdb4_"" with 1.0 weight got id 3
Reassigned 2048 (200.00%) partitions. Balance is now 0.00. Dispersion is now 0.00
Device d0r1z1-127.0.0.1:6010R127.0.0.1:6010/sdb1_"" with 1.0 weight got id 0
Device d1r1z1-127.0.0.1:6010R127.0.0.1:6010/sdb5_"" with 1.0 weight got id 1
Device d2r1z2-127.0.0.2:6020R127.0.0.2:6020/sdb2_"" with 1.0 weight got id 2
Device d3r1z2-127.0.0.2:6020R127.0.0.2:6020/sdb6_"" with 1.0 weight got id 3
Device d4r1z3-127.0.0.3:6030R127.0.0.3:6030/sdb3_"" with 1.0 weight got id 4
Device d5r1z3-127.0.0.3:6030R127.0.0.3:6030/sdb7_"" with 1.0 weight got id 5
Device d6r1z4-127.0.0.4:6040R127.0.0.4:6040/sdb4_"" with 1.0 weight got id 6
Device d7r1z4-127.0.0.4:6040R127.0.0.4:6040/sdb8_"" with 1.0 weight got id 7
Reassigned 6144 (600.00%) partitions. Balance is now 0.00. Dispersion is now 0.00
Device d0r1z1-127.0.0.1:6011R127.0.0.1:6011/sdb1_"" with 1.0 weight got id 0
Device d1r1z2-127.0.0.2:6021R127.0.0.2:6021/sdb2_"" with 1.0 weight got id 1
Device d2r1z3-127.0.0.3:6031R127.0.0.3:6031/sdb3_"" with 1.0 weight got id 2
Device d3r1z4-127.0.0.4:6041R127.0.0.4:6041/sdb4_"" with 1.0 weight got id 3
Reassigned 3072 (300.00%) partitions. Balance is now 0.00. Dispersion is now 0.00
Device d0r1z1-127.0.0.1:6012R127.0.0.1:6012/sdb1_"" with 1.0 weight got id 0
Device d1r1z2-127.0.0.2:6022R127.0.0.2:6022/sdb2_"" with 1.0 weight got id 1
Device d2r1z3-127.0.0.3:6032R127.0.0.3:6032/sdb3_"" with 1.0 weight got id 2
Device d3r1z4-127.0.0.4:6042R127.0.0.4:6042/sdb4_"" with 1.0 weight got id 3
Reassigned 3072 (300.00%) partitions. Balance is now 0.00. Dispersion is now 0.00
#. Read more about Storage Policies and your SAIO :doc:`policies_saio`
-------------
Testing Swift
-------------
#. Verify the unit tests run::
$HOME/swift/.unittests
Note that the unit tests do not require any Swift daemons running.
#. Start the "main" Swift daemon processes (proxy, account, container, and
object)::
startmain
(The "``Unable to increase file descriptor limit. Running as non-root?``"
warnings are expected and ok.)
The ``startmain`` script looks like the following:
.. literalinclude:: /../saio/bin/startmain
:language: bash
#. Get an ``X-Storage-Url`` and ``X-Auth-Token``::
curl -v -H 'X-Storage-User: test:tester' -H 'X-Storage-Pass: testing' http://127.0.0.1:8080/auth/v1.0
#. Check that you can ``GET`` account::
curl -v -H 'X-Auth-Token: <token-from-x-auth-token-above>' <url-from-x-storage-url-above>
#. Check that ``swift`` command provided by the python-swiftclient package works::
swift -A http://127.0.0.1:8080/auth/v1.0 -U test:tester -K testing stat
#. Verify the functional tests run::
$HOME/swift/.functests
(Note: functional tests will first delete everything in the configured
accounts.)
#. Verify the probe tests run::
$HOME/swift/.probetests
(Note: probe tests will reset your environment as they call ``resetswift``
for each test.)
----------------
Debugging Issues
----------------
If all doesn't go as planned, and tests fail, or you can't auth, or something
doesn't work, here are some good starting places to look for issues:
#. Everything is logged using system facilities -- usually in ``/var/log/syslog``,
but possibly in ``/var/log/messages`` on e.g. Fedora -- so that is a good first
place to look for errors (most likely python tracebacks).
#. Make sure all of the server processes are running. For the base
functionality, the Proxy, Account, Container, and Object servers
should be running.
#. If one of the servers are not running, and no errors are logged to syslog,
it may be useful to try to start the server manually, for example:
``swift-object-server /etc/swift/object-server/1.conf`` will start the
object server. If there are problems not showing up in syslog,
then you will likely see the traceback on startup.
#. If you need to, you can turn off syslog for unit tests. This can be
useful for environments where ``/dev/log`` is unavailable, or which
cannot rate limit (unit tests generate a lot of logs very quickly).
Open the file ``SWIFT_TEST_CONFIG_FILE`` points to, and change the
value of ``fake_syslog`` to ``True``.
#. If you encounter a ``401 Unauthorized`` when following Step 12 where
you check that you can ``GET`` account, use ``sudo service memcached status``
and check if memcache is running. If memcache is not running, start it using
``sudo service memcached start``. Once memcache is running, rerun ``GET`` account.
------------
Known Issues
------------
Listed here are some "gotcha's" that you may run into when using or testing your SAIO:
#. fallocate_reserve - in most cases a SAIO doesn't have a very large XFS partition
so having fallocate enabled and fallocate_reserve set can cause issues, specifically
when trying to run the functional tests. For this reason fallocate has been turned
off on the object-servers in the SAIO. If you want to play with the fallocate_reserve
settings then know that functional tests will fail unless you change the max_file_size
constraint to something more reasonable then the default (5G). Ideally you'd make
it 1/4 of your XFS file system size so the tests can pass.
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