Wazuh server unattended installation

Once the script finishes the installation, all the components are ready to use.

The Wazuh manager is installed and configured as a single-node cluster by default. To build a Wazuh multi-node cluster, you need to configure each Wazuh manager as a master or worker node.

One server has to be chosen as a master, the rest are designated as workers. The Master node configuration must be applied only to the server chosen for this role. For all the other servers, the configuration Worker node needs to be applied.

Master node:

1. Configure the cluster node by editing the following settings in the /var/ossec/etc/ossec.conf file:

   <cluster>
     <name>wazuh</name>
     <node_name>master-node</node_name>
     <node_type>master</node_type>
     <key>c98b62a9b6169ac5f67dae55ae4a9088</key>
     <port>1516</port>
     <bind_addr>0.0.0.0</bind_addr>
     <nodes>
       <node>wazuh-master-address</node>
     </nodes>
     <hidden>no</hidden>
     <disabled>no</disabled>
   </cluster>
   

   Parameters and descriptions:

   name	Name of the cluster.
   node_name	Name of the current node.
   node_type	It specifies the role of the node. It has to be set to master.
   key	Key that is used to encrypt communication between cluster nodes. The key must be 32 characters long and same for all of the nodes in the cluster. The following command can be used to generate a random key: openssl rand -hex 16.
   port	Destination port for cluster communication.
   bind_addr	Network IP address to which the node is bound to listen for incoming requests (0.0.0.0 for any IP).
   nodes	The address of the master node. It must be specified in all nodes, including the master itself. The address can be either an IP or a DNS.
   hidden	It shows or hides the cluster information in the generated alerts.
   disabled	It indicates whether the node is enabled or disabled in the cluster. This option must be set to no.

2. Once the /var/ossec/etc/ossec.conf configuration file is edited, the Wazuh manager needs to be restarted:

   SystemdSysV Init

   # systemctl restart wazuh-manager
   

Worker node:

1. Configure the cluster node by editing the following settings in the /var/ossec/etc/ossec.conf file:

   <cluster>
       <name>wazuh</name>
       <node_name>worker-node</node_name>
       <node_type>worker</node_type>
       <key>c98b62a9b6169ac5f67dae55ae4a9088</key>
       <port>1516</port>
       <bind_addr>0.0.0.0</bind_addr>
       <nodes>
           <node>wazuh-master-address</node>
       </nodes>
       <hidden>no</hidden>
       <disabled>no</disabled>
   </cluster>
   

   As shown in the example above, the following parameters have to be edited:

   name	Name of the cluster.
   node_name	Each node of the cluster must have a unique name.
   node_type	It has to be set as worker.
   key	The key created previously for the master node. It has to be the same for all the nodes.
   nodes	It has to contain the address of the master (it can be either an IP or a DNS).
   disabled	It has to be set to no.

2. Once the /var/ossec/etc/ossec.conf configuration file is edited, the Wazuh manager needs to be restarted:

   SystemdSysV Init

   # systemctl restart wazuh-manager
   

3. To verify that the Wazuh cluster is enabled and all the nodes are connected, execute the following command:

   # /var/ossec/bin/cluster_control -l
   

   An example output of the command looks as follows:

     NAME         TYPE    VERSION  ADDRESS
     master-node  master  4.0.0    10.0.0.3
     worker-node1 worker  4.0.0    10.0.0.4
     worker-node2 worker  4.0.0    10.0.0.5
   

   Note that 10.0.0.3, 10.0.0.4, 10.0.0.5 are example IPs.