How to Create the Cluster

Create a project in LXD, for example nc-cluster

lxc project create nc-cluster -c features.images=false -c features.profiles=false

Database (MariaDB)

1. Use template template06-nextcloud-db-standalone (follow instructions in Readme.md).
2. Move the container to the project nc-cluster

    lxc move db-server --target-project nc-cluster

   Moving the container will shut it down. Restart it.
3. Add the DNS entry in the /etc/hosts file. The IP address is reported in the tail of the provision log.
4. Test: to test the database is setup and running you can

   • open an ssh session into the container and run: systemctl status mysql

   • connect to the database using the credentials specified in the tail of the log

Cache (Redis)

1. Use template template10-redis-server (follow instructions in Readme.md)
2. Move the container to the project nc-cluster

    lxc move redis-server --project default  --target-project nc-cluster

   Moving the container will shut it down. Restart it.
3. Add the DNS entry in the /etc/hosts file. The IP address is reported in the tail of the provision log.
4. Test: to test the Redis is setup and running you can
   • open an ssh session and launch the following commands

     usrv@redis-server:~$ redis-cli
     127.0.0.1:6379> ping "Test"
     "Test"
     127.0.0.1:6379> 
     usrv@redis-server:~$ systemctl status redis

Storage (GlusterFS)

1. Use template template07-glusterfs-server.
2. Move the container to the project nc-cluster

    lxc move glusterfs-server --target-project nc-cluster

   Moving the container will shut it down. Restart it.
3. Add the DNS entry in the /etc/hosts file. The IP address is reported in the tail of the provision log.
4. Test: to test that GlusterFS is setup and running you can install the glusterfs-client in your host machine and try to mount the volume vol01:

    $ ls
    gluster-test
    $ sudo mount -t glusterfs glusterfs-server.localenv.com:/vol01 gluster-test
    $ df -hT gluster-test/
    Filesystem                           Type            Size  Used Avail Use% Mounted on
    glusterfs-server.localenv.com:/vol01 fuse.glusterfs  245G  8,4G  236G   4% /gluster-test

Web Server Nodes (Apache)

For each node:

1. Use template template09-web-server-node (follow instructions in Readme.md).
2. Move the container to the project nc-cluster.

    lxc move web-server-0n --target-project nc-cluster

   Moving the container will shut it down. Restart it.
3. Add the DNS entry in the /etc/hosts file. The IP address is reported in the tail of the provision log.
4. The mount operation is managed via the data-nextcloud.mount systemd service, enabled at boot. The mount point is at /data/nextcloud
5. Test: to test, connect to each node in the browser and login with admin/admin.

Haproxy Server

1. Use template08-haproxy-server (follow instructions in Readme.md).
2. Move the container to the project nc-cluster.

    lxc move haproxy-server --target-project nc-cluster

   Moving the container will shut it down. Restart it.
3. Add the DNS entry in the /etc/hosts file. The IP address is reported in the tail of the provision log.
4. Test: to test the HAProxy setup you can
   • open an ssh session and launch the following commands

How to Start the Cluster

lxc switch project nc-cluster

lxc start database-server

lxc start glusterfs-server

lxc start redis-server

lxc start web-server-01

lxc start web-server-02

lxc ls
+------------------+---------+--------------------+---------------------------------------------+-----------+-----------+
|       NAME       |  STATE  |        IPV4        |                    IPV6                     |   TYPE    | SNAPSHOTS |
+------------------+---------+--------------------+---------------------------------------------+-----------+-----------+
| db-server        | RUNNING | 10.23.46.79 (eth0) | fd42:fa6c:5eee:12:216:3eff:fe69:d1ea (eth0) | CONTAINER | 0         |
+------------------+---------+--------------------+---------------------------------------------+-----------+-----------+
| glusterfs-server | RUNNING | 10.23.46.48 (eth0) | fd42:fa6c:5eee:12:216:3eff:fed0:a5cf (eth0) | CONTAINER | 0         |
+------------------+---------+--------------------+---------------------------------------------+-----------+-----------+
| haproxy-server   | RUNNING | 10.23.46.97 (eth0) | fd42:fa6c:5eee:12:216:3eff:fe5b:6841 (eth0) | CONTAINER | 0         |
+------------------+---------+--------------------+---------------------------------------------+-----------+-----------+
| redis-server     | RUNNING | 10.23.46.13 (eth0) | fd42:fa6c:5eee:12:216:3eff:fefc:618c (eth0) | CONTAINER | 0         |
+------------------+---------+--------------------+---------------------------------------------+-----------+-----------+
| web-server-01    | RUNNING | 10.23.46.12 (eth0) | fd42:fa6c:5eee:12:216:3eff:fe3b:a06b (eth0) | CONTAINER | 0         |
+------------------+---------+--------------------+---------------------------------------------+-----------+-----------+
| web-server-02    | RUNNING | 10.23.46.21 (eth0) | fd42:fa6c:5eee:12:216:3eff:fe45:5f41 (eth0) | CONTAINER | 0         |
+------------------+---------+--------------------+---------------------------------------------+-----------+-----------+