swift/install-guide/source/storage-install-rdo.rst

Install and configure the storage nodes for Red Hat Enterprise Linux and CentOS

This section describes how to install and configure storage nodes that operate the account, container, and object services. For simplicity, this configuration references two storage nodes, each containing two empty local block storage devices. The instructions use /dev/sdb and /dev/sdc, but you can substitute different values for your particular nodes.

Although Object Storage supports any file system with extended attributes (xattr), testing and benchmarking indicate the best performance and reliability on XFS. For more information on horizontally scaling your environment, see the Deployment Guide.

This section applies to Red Hat Enterprise Linux 7 and CentOS 7.

Prerequisites

Before you install and configure the Object Storage service on the storage nodes, you must prepare the storage devices.

Note

Perform these steps on each storage node.

1. Install the supporting utility packages:

   # yum install xfsprogs rsync

2. Format the /dev/sdb and /dev/sdc devices as XFS:

   # mkfs.xfs /dev/sdb
   # mkfs.xfs /dev/sdc

3. Create the mount point directory structure:

   # mkdir -p /srv/node/sdb
   # mkdir -p /srv/node/sdc

4. Edit the /etc/fstab file and add the following to it:

   /dev/sdb /srv/node/sdb xfs noatime,nodiratime,nobarrier,logbufs=8 0 2
   /dev/sdc /srv/node/sdc xfs noatime,nodiratime,nobarrier,logbufs=8 0 2

5. Mount the devices:

   # mount /srv/node/sdb
   # mount /srv/node/sdc

6. Create or edit the /etc/rsyncd.conf file to contain the following:

   uid = swift
   gid = swift
   log file = /var/log/rsyncd.log
   pid file = /var/run/rsyncd.pid
   address = MANAGEMENT_INTERFACE_IP_ADDRESS
   
   [account]
   max connections = 2
   path = /srv/node/
   read only = False
   lock file = /var/lock/account.lock
   
   [container]
   max connections = 2
   path = /srv/node/
   read only = False
   lock file = /var/lock/container.lock
   
   [object]
   max connections = 2
   path = /srv/node/
   read only = False
   lock file = /var/lock/object.lock

   Replace MANAGEMENT_INTERFACE_IP_ADDRESS with the IP address of the management network on the storage node.

   Note

   The rsync service requires no authentication, so consider running it on a private network in production environments.

7. Start the rsyncd service and configure it to start when the system boots:

   # systemctl enable rsyncd.service
   # systemctl start rsyncd.service

Install and configure components

Note

Default configuration files vary by distribution. You might need to add these sections and options rather than modifying existing sections and options. Also, an ellipsis (...) in the configuration snippets indicates potential default configuration options that you should retain.

Note

Perform these steps on each storage node.

1. Install the packages:

   # yum install openstack-swift-account openstack-swift-container \
     openstack-swift-object

2. Obtain the accounting, container, and object service configuration files from the Object Storage source repository:

   # curl -o /etc/swift/account-server.conf https://git.openstack.org/cgit/openstack/swift/plain/etc/account-server.conf-sample?h=stable/newton
   # curl -o /etc/swift/container-server.conf https://git.openstack.org/cgit/openstack/swift/plain/etc/container-server.conf-sample?h=stable/newton
   # curl -o /etc/swift/object-server.conf https://git.openstack.org/cgit/openstack/swift/plain/etc/object-server.conf-sample?h=stable/newton

6. Ensure proper ownership of the mount point directory structure:

   # chown -R swift:swift /srv/node

7. Create the recon directory and ensure proper ownership of it:

   # mkdir -p /var/cache/swift
   # chown -R root:swift /var/cache/swift
   # chmod -R 775 /var/cache/swift