In ADCM a host means a representation of a real hardware or virtual host. It doesn’t matter what infrastructure the original host uses — a cloud or bare metal.
The process of configuring hosts in ADCM differs depending on the selected hostprovider. This topic explains how to add and configure hosts in ADCM using the SSH hostprovider, that is, essentially, a connector to already created hosts.
Before adding hosts in ADCM using the SSH hostprovider, make sure that:
The steps for adding the hosts that are based on the SSH hostprovider are listed below:
Select the HOSTS tab and click Create host.Adding a host in ADCM
In the opened dialog:
Description of the host being added
Select the created hostprovider in the Hostprovider field. Notice that hostproviders are displayed with the names that you have assigned to them.
Enter the fully qualified domain name (FQDN) of the host in the Fully qualified domain name field. FQDN should contain both the host name and the domain name.
Receive the message on the new host being successfully added and click Cancel, if you do not need more hosts.The host is successfully added
Return to the HOSTS tab and switch to the host configuring. To do this, click the row that contains the added host and select the Configuration tab in the opened window, or click the icon in the Config column. Both methods open the configuration window.Switching to the host configuring
In the opened window, select the Configuration tab, fill in the necessary parameters, and click Save.Configuring the host
The assignment of parameters is listed in the table below.
Hosts configuration parameters Parameter Description
A user name that is used for connecting to a host via SSH
A user password that is used for connecting to a host via SSH. If you don’t use a password, leave this field blank
SSH private key
A private SSH key that is used for connecting to a host via SSH. It is created in a pair with the public key that you define for a host when configuring it. If you don’t use SSH keys, leave this field blank
An IP address of a host
A port number that is used for connecting to a host via SSH (by default,
SSH arguments for Ansible. Can be left at the default value. Thus,
UserKnownHostsFile=/dev/nullparameters disable strict host key checking for SSH. Otherwise, when this checking is enabled, the SSH client connects only to the known hosts, that are stored in the known hosts list
A flag that grants the superuser privileges to the user specified in the Username field. The default value should be used (flag is set)
Ansible become password
A password that is used during the granting of the superuser privileges to the user specified in the Username field. Can be left at the default value
Return to the Hosts tab. In the row that contains the added host, click the icon in the Actions column and select the Check connection drop-down menu item. Confirm the action in the opened window.Switching to the connection checkConfirming the connection check
Wait until the connection check is completed. If the connection check runs successfully, it means that the host is configured correctly and can be added to a new cluster.NOTEIn case of errors, you can find the logs at the JOBS tab.
After the connection check is completed, install statuschecker. It is a special daemon that periodically checks the status of the services and components added to the cluster hosts via ADCM. To install this daemon, click the icon in the Actions column again and select the Install statuschecker drop-down menu item. Then confirm the action in the opened window.Switching to the statuschecker installationConfirming the statuschecker installation
Wait until the statuschecker installation is completed.
IMPORTANTIn case of online installation, you should add a separate host for every ADH cluster node and optionally — if you are going to install a monitoring cluster — at least one host for monitoring needs.