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1. Install GlusterFS server

   Code Block
   yum install -y glusterfs-server restorecon /var/run/glusterd.socket service glusterd start

2. Set up connectivity

   • On the new node, connect to all the previous cluster nodes with the following commands (repeated once for every node):

     Code Block
     gluster peer probe 10.1.87.10 gluster peer probe 10.1.87.11

   • On all previous nodes execute the following command (with the IP of the new server that is being added):

     Code Block
     gluster peer probe 10.1.87.12

3. Create or extend the volume

   • If this is the first installation, then create the cluster file system. For fresh installations steps 1-2 can be executed on all the servers first, to then execute the "volume create" command here just once.

     Code Block
     gluster volume create gv0 replica 2 10.1.87.10:/var/lib/squirro/storage/gv0/brick0 10.1.87.11:/var/lib/squirro/storage/gv0/brick0 10.1.87.12:/var/lib/squirro/storage/gv0/brick0 force gluster volume start gv0

     Repeat the IP/directory part of the command for every cluster node, both the previous ones as well as the new one.
     
     The replica 2 option can be modified to indicate how many replicas should be kept of each file. The force option at the end confirms that we are okay to create the volume on the linux system's root file system partition.
      

   • If this is a new server, being added to an existing GlusterFS installation, then execute this command to use this server for the volume:

     Code Block
     gluster volume add-brick gv0 10.1.87.12:/var/lib/squirro/storage/gv0/brick0 force

      The force option at the end confirms that we are okay to create the volume on the linux system's root file system partition.
     
     

4. Configure the cluster storage volume to be mounted. Add the following line to /etc/fstab:

   Code Block
   language text title /etc/fstab (excerpt)
   127.0.0.1:/gv0 /mnt/gv0 glusterfs defaults 0 0

5. Then create the mount-point and mount the new file system:

   Code Block
   mkdir -p /mnt/gv0 mount /mnt/gv0

6. Set up all the required directories in the shared file system:

   Code Block

   install -o sqprovid -g squirro -d /mnt/gv0/storage install -o sqsqirrl -g squirro -d /mnt/gv0/squirrel_log install -o sqplumbr -g squirro -d /mnt/gv0/pipelets install -o sqfile -g squirro -d /mnt/gv0/fileimport install -o sqfile -g squirro -d /mnt/gv0/fileimport/uploads install -o sqtrends -g squirro -d /mnt/gv0/trends_data install -o sqtopic -g squirro -d /mnt/gv0/assets install -o sqtopic -g squirro -d /mnt/gv0/widgets

7. Change the configuration of the various Squirro services to point to the right folder. Below you see for each config file the desired sections and values - all the values that have been left out here should be left unmodified.

   Code Block
   language text title /etc/squirro/storage.ini (excerpt)
   [storage] default_bucket = cluster

   Code Block
   language text title /etc/squirro/squirrel.ini (excerpt)
   [storage] directory = /mnt/gv0/squirrel_log/ url_prefix = /storage/cluster/squirrel_log/

   Code Block
   language text title /etc/squirro/plumber.ini (excerpt)
   [storage] directory = /mnt/gv0/pipelets/

   Code Block
   language text title /etc/squirro/topic.ini (excerpt)
   [topic] custom_assets_directory = /mnt/gv0/widgetsassets/ custom_widgets_directory = /mnt/gv0/widgets/

   Code Block
   language text title /etc/squirro/trends.ini (excerpt)
   [offline_processing] data_directory = /mnt/gv0/trends_data

8. Replace the previous assets and widgets folders with symlinks:

   Code Block
   rm -ir /var/lib/squirro/topic/assets rm -ir /var/lib/squirro/topic/widgets ln -s /mnt/gv0/assets /var/lib/squirro/topic/assets ln -s /mnt/gv0/widgets /var/lib/squirro/topic/widgets

9. In the nginx config file /etc/nginx/conf.d/frontend.conf change a few of the alias declarations:
   
   1. Inside the location /storage/localfile/ block change the alias from its default to alias /mnt/gv0/storage/
   2. Inside the location /storage/squirrel_log block change the alias from its default to alias /mnt/gv0/squirrel_log/

   3. Verify that the configuration is still valid:

      Code Block
      nginx -t

   4. Reload the nginx configuration:

      Code Block
      service nginx reload

10. Restart all services:

    Code Block
    monit -g all-active restart