SLB Server Pool
The SLB function uses the load balancing algorithm to distribute the traffic and this utilizes the resources of the intranet servers. You can use the following methods to balance the server load:
- Distribute the traffic to the specified port of each intranet server. This is applicable to the scenario that different intranet servers provide the same service via specified port at the same time.
- Distribute the traffic to different ports of an intranet server. This is applicable to the scenario that an intranet server provides the same service by running the same process at different ports.
- Combine the above two methods.
Configuring SLB Server Pool and Track Rule
To configure an SLB server pool and track rule, take the following steps:
- Select Object > SLB Server Pool.
- Click New. The SLB Server Pool Configuration dialog box appears.
- When the members in the SLB server pool have the same IP address and different ports, you don’t need to specify the port when configuring the track rule. System will track each IP address and its port in the SLB server pool.
- When there is a member whose port is not configured exists in the SLB sever pool, you must specify the port when configuring the track rule. System will track the specified port of the IP addresses in the SLB server pool.
- When the members in the SLB server pool are all configured with IP addresses and ports and these configured IP addresses are different from each other, you can select whether to specify the port when configuring the track rule. If specified, system will track the specified port of these IP addresses. If not, system will track the configured ports of the IP addresses of the members.
- Click OK to save the settings.
|Name||Specifies the name of the SLB server pool|
|Algorithm||Select an algorithm for load balancing.|
|Member||Specifies the member of the pool. You can type the IP range or the IP address and the netmask.|
|Port||Specifies the port number of the server.|
|Maximum Sessions||Specifies the allowed maximum sessions of the server. The value ranges from 0 to 1,000,000,000. The default value is 0, which represents no limitation.|
|Weight||Specifies the traffic forwarding weight during the load balancing. The value ranges from 1 to 255.|
|Add||Add the SLB address pool member to the SLB server pool. You can add up to 256 members.|
|Track Type||Selects a track type.|
Specifies the port number that will be tracked. The value ranges from 1 to 65535.
|Interval||Specifies the interval between each Ping/TCP/UDP packet. The unit is second. The value ranges from 3 to 255.|
|Retries||Specifies a retry threshold. If no response packet is received after the specified times of retries, System will determine this track entry fails, i.e., the track entry is unreachable. The value range is 1 to 255.|
|Weight||Specifies a weight for the overall failure of the whole track rule if this track entry fails. The value range is 1 to 255.|
|Add||Click Add to add the configured track rule to the list.|
|Threshold||Types the threshold for the track rule into the Threshold box. The value range is 1 to 255. If the sum of weights for failed entries in the track rule exceeds or equals the threshold, system will conclude that the track rule fails.|
|Description||Types the description for this track rule.|
Viewing Details of SLB Pool Entries
To view the details of the servers in the SLB pool, take the following steps:
- Click Object > SLB Server Pool.
- Select "+" before an SLB pool entry.
- In the Server List tab under the entry, view the information of the servers that are in this SLB pool.
- In the Monitoring tab, view the information of the track rules.
- In the Referenced tab, view the DNAT rules that use the SLB pool.