Scenario

By default, the LDAP service deployed in the OMS and cluster can be accessed by any IP address. To enable the LDAP service to be accessed by only trusted IP addresses, you can configure the INPUT policy in the iptables filtering list.

Impact on the System

After the configuration, the LDAP service cannot be accessed by IP addresses that are not configured. Before the expansion, the added IP addresses need to be configured as trusted IP addresses.

Prerequisites

You have collected the management plane IP addresses and service plane IP addresses of all nodes in the cluster and all floating IP addresses.
You have obtained the root user account for all nodes in the cluster.

Procedure

Configuring trusted IP addresses for the LDAP service on the OMS

Confirm the management node IP address. For details, see Logging In to the Management Node.
Log in to FusionInsight Manager. For details, see Logging In to FusionInsight Manager.
Choose System > OMS and choose oldap > Modify Configuration to view the OMS LDAP port number, that is, the value of LDAP Listening Port. The default port number is 21750.
Log in to the active management node as user root using the IP address of the active management node.
Run the following command to check the INPUT policy in the iptables filtering list:
iptables -L

For example, if no rule is configured, the INPUT policy is displayed as follows:
```
Chain INPUT (policy ACCEPT) 
target     prot opt source               destination              
```
Run the following command to configure all IP addresses used by the cluster as trusted IP addresses. Each IP address needs to be added independently.
iptables -A INPUT -s Trusted IP address -p tcp --dport Port number -j ACCEPT

For example, to configure 10.0.0.1 as a trusted IP address and enable it to access port 21750, you need to run the following command:

iptables -A INPUT -s 10.0.0.1 -p tcp --dport 21750 -j ACCEPT
Run the following command to configure all IP addresses as untrusted IP addresses. The trusted IP addresses will not be affected by this rule.
iptables -A INPUT -p tcp --dport Port number -j DROP

For example, to disable all IP addresses to access port 21750, run the following command:

iptables -A INPUT -p tcp --dport 21750 -j DROP

Run the following command to view the modified INPUT policy in the iptables filtering list:

iptables -L

For example, after a trusted IP address is configured, the INPUT policy is displayed as follows:

Chain INPUT (policy ACCEPT) 
target     prot opt source               destination          
ACCEPT     tcp  --  10.0.0.1             anywhere            tcp dpt:21750 
DROP       tcp  --  anywhere             anywhere            tcp dpt:21750

Run the following command to view the rules and rule numbers in the iptables filtering list:

iptables -L -n --line-number

Chain INPUT (policy ACCEPT) 
num target     prot opt source               destination          
1   DROP       tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:21750

Run the following command to delete the desired rule from the iptables filtering list based on site requirement:
iptables -D INPUT Number of the rule to be deleted

For example, to delete rule 1, run the following command:

iptables -D INPUT 1
Log in to the standby management node as user root using the standby IP address. Repeat 5 to 10.

Configuring trusted IP addresses for the LDAP service in the cluster

Log in to FusionInsight Manager.
Click Cluster, click the name of the desired cluster, and choose Service > LdapServer. On the displayed page, click Instance to view the nodes where the LDAP services locate.
Go to the Configurations page, and view the LDAP port number of the cluster, that is, the value of LDAP_SERVER_PORT. The default value is 21780.
Log in to the LDAP node as user root using the LDAP service IP address.
Run the following command to view the INPUT policy in the iptables filtering list:
iptables -L

For example, if no rule is configured, the INPUT policy is displayed as follows:
```
Chain INPUT (policy ACCEPT) 
target     prot opt source               destination              
```
Run the following command to configure all IP addresses used by the cluster as trusted IP addresses. Each IP address needs to be added independently.
iptables -A INPUT -s Trusted IP address -p tcp --dport Port number -j ACCEPT

For example, to configure 10.0.0.1 as a trusted IP address and enable it to access port 21780, you need to run the following command:

iptables -A INPUT -s 10.0.0.1 -p tcp --dport 21780 -j ACCEPT
Run the following command to configure all IP addresses as untrusted IP addresses. The trusted IP addresses will not be affected by this rule.
iptables -A INPUT -p tcp --dport Port number -j DROP

For example, to disable all IP addresses to access port 21780, run the following command:

iptables -A INPUT -p tcp --dport 21780 -j DROP