Setting up high availability storage with MogileFS

** 1. Environment**

I used 4 Xen virtual images running ubuntu 8.04.
Two will run a tracker and the database, the other two will be the storage nodes.

Lets say the IP addresses will be:

2. Initial Setup

Install iptables:

apt-get install iptables

then apply initial setup

iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -p tcp --dport ssh -j ACCEPT iptables -A INPUT -j DROP iptables-save -c > /etc/iptables.rules
you can save the rule for beyond machine reboot by adding the two lines below to /etc/network/interfaces
pre-up iptables-restore < /etc/iptables.rules post-down iptables-save -c > /etc/iptables.rules

install mysql and wget and perldoc

apt-get install mysql-server apt-get install wget apt-get install perl-doc apt-get install libio-aio-perl apt-get install subversion apt-get install build-essential

3. Common steps for installing MogileFS

retrieve the code (ripped of the how to wiki):

cd /usr/local/src mkdir mogilefs-src cd mogilefs-src svn checkout

install perl dependencies

cpan Danga::Socket cpan Gearman::Client cpan Gearman::Server cpan Gearman::Client::Async cpan Net::Netmask cpan Perlbal cpan IO::WrapTie

install the servers:

cd mogilefs-src/trunk/server perl Makefile.PL make make test make install

At the moment the test seems to need mysql to be installed and user root without password, so some tests are skipped

you will need to install MogileFS::Client
(the tests expect a tracker to run locally on port 7001)

cd mogilefs-src/trunk/api/perl/MogileFS-Client perl Makefile.PL make make test make install

and some admin tools:

cd mogilefs-src/trunk/utils perl Makefile.PL make make test make install

4. Tracker install

create the database:

mysql -uroot -p mysql> CREATE DATABASE mogilefs; mysql> GRANT ALL ON mogilefs.* TO 'mogile'@'%'; mysql> SET PASSWORD FOR 'mogile'@'%' = OLD_PASSWORD( 'sekrit' ); mysql> FLUSH PRIVILEGES; mysql> quit

Create the schema

./mogdbsetup --dbname=mogilefs --dbuser=mogile --dbpassword=sekrit

(admin privilege is required for the initial setup, so if you're admin user is not root with no password, you will need to specify --dbroopassword and --dbrootuser)

create /etc/mogilefs/mogilefsd.conf:

db_dsn DBI:mysql:mogilefs db_user mogile db_pass ****** conf_port 7001 listener_jobs 5

create a mogile user:

adduser mogile

and starts the tracker under that user:

su - mogile mogilefsd

open a port for the tracker

iptables -A INPUT -p tcp --dport 7001 -j ACCEPT

5. Storage node

On the storage server, create a configuration file at /etc/mogilefs/mogstored.conf with the following:

httplisten= mgmtlisten= docroot=/var/mogdata

open a port:

iptables -A INPUT -p tcp --dport 7500 -j ACCEPT

iptables -A INPUT -p tcp --dport 7501 -j ACCEPT

register a new storage node:

mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= host add mogilestorage --ip= --port=7500 --status=alive

it should now appears in the list:

mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= host list

Add a device to the storage:

mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= device add mogilestorage 1

and create the directory:

mkdir -p /var/mogdata/dev1

make sure /var/mogdata/* is owned by mogile:mogile

chown -R mogile:mogile /var/mogdata/*

6. Starting the storage server

as root:
mogstored --daemon

7. Starting the tracker

su - mogile mogilefsd -c /etc/mogilefs/mogilefsd.conf --daemon exit

8. Testing

check that mogilefs components are online:

mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= check

Quick sanity check of the storage daemon:

~/Projects/mogilefs $ telnet 7500 Trying Connected to Escape character is '^]'. PUT /dev1/test HTTP/1.0 Content-length: 4 \n test HTTP/1.0 200 OK Content-Type: text/html Content-Length: 18 Server: Perlbal Connection: close 200 - OK Connection closed by foreign host.

create a domain

mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= domain add mydomain

and a class

mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= class add mydomain images

Quick sanity check of the tracker:

[email protected]:~# mogtool --trackers= --domain=mydomain --class=images inject osname osname

on the store node, check /var/mogdata/dev1/0/000/000 for a file named xxxxxxxxxx.fid .
If the file exists it's all good.

9. setting up the second pair

Replay instructions 1 to 8, then:

when you've got the second storage set up, you will need to register the second storage and its device to all trackers:

mkdir -p /var/mogdata/dev2 mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= host add mogilestorage2 --ip= --port=7500 --status=alive mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= device add mogilestorage2 2 mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= host add mogilestorage2 --ip= --port=7500 --status=alive mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= device add mogilestorage2 2

you will also need to register the first storage and its device to the second tracker:

mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= host add mogilestorage --ip= --port=7500 --status=alive mogadm --lib=/usr/local/share/perl/5.8.8 --trackers= device add mogilestorage 1

sanity check the installation:

mogadm --lib=/usr/local/share/perl/5.8.8 --trackers=, check

Checking trackers... ... OK ... OK

Checking hosts...
[ 1] mogilestorage2 ... OK
[ 2] mogilestorage ... OK

Checking devices...
host device size(G) used(G) free(G) use% ob state I/O%