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Cloud Gateway

Cloud Gateway's goal is to make it easy to store files in an object-based storage like Amazon S3 or Openstack Swift, while retaining the features of a POSIX filesystem.

Cloud Gateway is developed since 2011 by Nuage Labs SAS, and has been released as an Open Source Software in 2017 under the AGPLv3 license.

For Full documentation see https://cloud-gateway.readthedocs.io/en/latest/.

Prerequisites

Install prerequisites:

sudo apt-get install build-essential bzip2 gzip git libreadline-dev libpq-dev postgresql-server-dev-all libcurl4-openssl-dev libnl-3-dev libnl-genl-3-dev libnl-nf-3-dev libnl-route-3-dev libxml2-dev libevent-dev libfuse-dev libjson-c-dev cmake libz-dev libssl-dev
wget https://github.com/rgacogne/libevaio/archive/libevaio_0_4.tar.gz
tar xf libevaio_0_4.tar.gz
cd libevaio-libevaio_0_4
mkdir build && cd build && cmake ../ && make
sudo make install

Compilation

Cloud Gateway's build is based on cmake.

Get cloudgw:

git clone https://github.com/nuagelabsfr/cloud-gateway.git
cd cloudgw

To build in debug mode, you can simply do:

mkdir build && cd build && cmake ../src && make

In order to do a release build:

mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ../src && make

Install

sudo apt-get install postgresql fuse

sudo sed -i 's,#user_allow_other,user_allow_other,' /etc/fuse.conf

sudo make install
sudo cp /usr/local/etc/CloudGatewayConfiguration.xml.sample /usr/local/etc/CloudGatewayConfiguration.xml

sudo bash /usr/local/share/cloudgateway/bin/create_db_user_as_root.sh

sudo groupadd cloudgw
sudo useradd -g cloudgw -m --home-dir /home/cloudgw cloudgw

sudo chgrp cloudgw /usr/local/etc/CloudGatewayConfiguration.xml
sudo chmod g+rw /usr/local/etc/CloudGatewayConfiguration.xml

If you are not using the systemd unit files:

sudo mkdir -p /run/cloudgateway
sudo chown cloudgw:cloudgw /run/cloudgateway
sudo chmod 0750 /run/cloudgateway

sudo mkdir -p /var/log/cloudgateway
sudo chown cloudgw:cloudgw /var/log/cloudgateway
sudo chmod 0750 /var/log/cloudgateway

Configuration

  1. For more options see the documentation (docs/ReferenceManual)

  2. Add a Cloud Storage provider instance (here with OpenstackSwift Identity v2 with a TenantName) :

CloudGatewayAddInstance -n <Instance Name> \
            -P Openstack \
            -f /usr/local/etc/CloudGatewayConfiguration.xml \
            -i 2 -A <Authentication Endpoint> -c <Container Name> \
            -u <Username> -p <Password> -T <Tenant Name>

Caution: Note that the container / bucket should exist before the Storage Manager is started. Caution: Please take care of the fact that the Openstack Authentication Endpoint URL does not contain the final /v1.0/, /v1.1/ or /v2.0/ part that some providers mention in their documentation, as it is automatically appended by Cloud Gateway.

  1. Add a filesystem using this provider
CloudGatewayAddFilesystem -i <Filesystem Name> \
        -t Single \
        -c <Cache Directory Full Path> \
        -u <Full Threshold> \
        -f /usr/local/etc/CloudGatewayConfiguration.xml \
	-m <Mount Point> \
        <Instance Name>
  1. Create the cache folder
mkdir -m 0750 <Cache Directory Full Path>
chown cloudgw:cloudgw <Cache Directory Full Path>

Run CloudGateway without systemd

  1. Launch CloudGateway
sudo -u cloudgw /usr/local/bin/CloudGatewayStorageManager start
  1. Mount the Filesystem
sudo mkdir <Mount Point>
sudo chown cloudgw <Mount Point>
sudo -u cloudgw /usr/local/bin/CloudGatewayMount <Filesystem Name> /usr/local/etc/CloudGatewayConfiguration.xml &

Run CloudGateway with systemd

  1. Copy systemd service files
sudo cp /usr/local/share/cloudgateway/resources/cloudgatewaymount\@.service /etc/systemd/system
sudo cp /usr/local/share/cloudgateway/resources/cloudgateway.service /etc/systemd/system

LogsDirectory, LogsDirectoryMode, RuntimeDirectoryPreserve require systemd 235 (for Debian users, it is available in the stretch-backports repository).

  1. Reload systemd
sudo systemctl daemon-reload
  1. Start CloudGateway
sudo systemctl start cloudgateway
  1. Mount the Filesystem
sudo systemctl start cloudgatewaymount@<Filesystem Name>