For NLB clusters, scalability is the ability to incrementally add one or more systems to an existing cluster when the overall load of the cluster exceeds its capabilities. To support scalability, you can do the following with NLB:. Balance multiple server load requests from the same client or from several clients across multiple hosts in the cluster. Enable high performance and low overhead through a fully pipelined implementation. Pipelining allows requests to be sent to the NLB cluster without waiting for a response to a previous request.
Specify the load balancing behavior for a single IP port or group of ports by using port management rules. Define different port rules for each website. If you use the same set of load-balanced servers for multiple applications or websites, port rules are based on the destination virtual IP address using virtual clusters. Direct all client requests to a single host by using optional, single-host rules.
NLB routes client requests to a particular host that is running specific applications. Enable Internet Group Management Protocol IGMP support on the cluster hosts to control switch port flooding where incoming network packets are sent to all ports on the switch when operating in multicast mode. NLB logs all actions and cluster changes in the event log. However, some task details are changed. Suppose you have one site that accepts only secured requests port The NLB service will only redirect an incoming request between the web servers that are part of the load balancer thus you just need to open the rules from the NLB server to each Web Server on port both ways.
Hope this will server you well. We have a windows console application and it is running as a windows scheduler, can we depend on NLB concept and just keep another instance of the app running on different server. My question is that, Which type of applications can configure on NLB.
Means which type of applications supported on NLB?? Download Trial. Buy Now. For testing purposes I will add a random IP address: The next section is used to configure cluster parameters. A NLB cluster must operate in one of the following modes: Unicast — the MAC address of the cluster virtual network adapter is shared with all cluster nodes.
From the three available options, choose multicast and proceed with the next section: From the port rules section we configure how traffic is managed on the NLB cluster. There are three available filtering methods, as follows: Multiple host — used to configure all nodes within the NLB cluster to respond to requests.
We will add the second server by right clicking the cluster and selecting Add Host to Cluster: Now you will need to follow the same procedure as we did earlier for the first node.
Dan Popescu. February 3, at am. Popescu Dan says:. About Load Balancers A load balancer includes one or more backend sets to route incoming traffic to backend servers.
The backend set is a logical entity that includes: A list of backend servers , to which traffic is directed by the load balancer. In Big Data Service, the cluster nodes are the backend servers. A backend server is typically identified by an IP address and a port. A load balancing policy , which tells the load balancer how to distribute incoming traffic to the backend servers.
A health check policy , to test the health and availability of backend servers. Optional session persistence configuration. Session persistence isn't used in the scenario described below. Overview of This Task These instructions tell how to create a load balancer that can be used as the front end for accessing Apache Ambari or Cloudera Manager, Hue, and Big Data Studio from a web browser. Specifically, you do the following: Create a load balancer.
Add one backend server to each backend set. A backend server is the cluster node where the service runs, plus the port where the service listens for requests.
SSL certificates, used for authentication. Self-signed certificates from the cluster are required. This requirement is explained more fully in step one, below. In a highly available HA cluster , the services run on the following nodes: Apache Ambari or Cloudera Manager runs on the first utility node.
Hue and Big Data Studio run on the second utility node. For listeners, you can use signed SSL certificates issued by a trusted certificate authority or you can use self-signed certificates that you download from the cluster. Oracle recommends that you use signed SSL certificates from a certificate authority to provide the highest level of security. Note Each node has a unique https. The file names are the same in each node, but the contents are different for each node.
Note Download the certificates before you proceed to the next step. Note Each node has a unique node. The file names are all the same, but the contents are different for each node. Then click Load Balancers. In the left panel, under Compartment , select a compartment select the compartment where you want to create the load balancer. Then click Create Load Balancer.
Click Next. Select Backend Servers: Skip this option. You'll add a backend server later. Use SSL: Leave this box unchecked. You'll configure SSL for this backend set later. On the Configure Listener page, enter the following information: Listener Name: Enter a name for the listener, for example cm-listener.
Note The names used for the bundles in the table below are user-supplied names. Certificate Bundles Bundle Contents lb-ca-signed-cert CA-signed SSL certificate, obtained from a certificate authority, for the listener on the load balancer host CA certificate from your certificate authority Private key associated with SSL certificate, above node0-self-signed-cert Self-signed SSL certificate for the first utility node, downloaded from the cluster Private key downloaded from first utility node node1-self-signed-cert Self-signed SSL certificate for the second utility node, downloaded from the cluster Private key downloaded from second utility node.
Note In several steps while creating the load balancer, you'll be prompted to enter certificates and keys. For example, the options for adding an SSL certificate are: Choose SSL Certificate File: If you select this option, you can either drag a file from your local file system directly into the SSL Certificate box, or you can click select one and navigate to select the file on your file system.
Complete These Steps A HA Yes 2: Create a bundle with a CA-signed certificate 3: Create a bundle with the self-signed certificate from the first utility node 4: Create a bundle with the self-signed certificate from the second utility node B Non-HA Yes 2: Create a bundle with a CA-signed certificate 3: Create a bundle with the self-signed certificate from the first utility node C HA No 3: Create a bundle with the self-signed certificate from the first utility node 4: Create a bundle with the self-signed certificate from the second utility node D Non-HA No 3: Create a bundle with the self-signed certificate from the first utility node.
Enter the following information. Name: Read only. This name was created for you by the wizard. Verify Peer Certificate: Check this box. Verify Depth: Set to 1 , or select another number to indicate maximum depth for certificate chain verification. On the Create Backend Set page, enter the following information. Name: Provide a name, for example, data-studio-backend-set.
Remember, the wizard assigned this name to the first backend set. On the Add Backends page, select IP Addresses at the top of the page, and enter the following information: IP Address: Enter the private IP address of the first utility node of your cluster, for example Weight: Accept the default value 1. In the Backend Sets table, click the name of the backend set you created for Hue, for example hue-backend-set. Port: Enter , for the port where Big Data Studio listens. On the Edit Listener page, enter the following information: Name: Read only.
If you're using the self-signed certificate from the cluster only, select: node0-self-signed-cert This is the bundle containing the self-signed SSL certificate for the first utility node of the cluster. On the left side of the page, under Resources , click Listeners. Click Create Listener. On the Create Listener page, enter the following information: Name: Enter a name for the listener, for example, hue-listener.
Use SSL : Select this box, then, under Certificate Name , select the certificate bundle for your use case: If you're using a CA-signed certificate , select lb-ca-signed-cert. If you're using only self-signed certificates with an HA cluster , select: node1-self-signed-cert , This is the bundle containing the self-signed SSL certificate for the second utility node of the cluster.
On the Create Listener page, enter the following information: Name: Enter a name for the listener, for example, data-studio-listener. STEP Access the Cluster It may take a few minutes for the backend sets and listeners to be ready to receive requests. Tip If it's taking a long time for the health check, consider shortening the interval. Click the action menu at the end of the row containing a backend set, and select Update Heath Check.
Change Interval in Ms to the minimum interval and Timeout in Ms to Repeat for each backend set. You can change the settings later if you want the health checks to be performed less often.
Yarn Jobs Completed. Spark Jobs Completed. You can use NLB to manage two or more servers as a single virtual cluster. NLB enhances the availability and scalability of Internet server applications such as those used on web, FTP, firewall, proxy, virtual private network VPN , and other mission-critical servers.
By combining two or more computers that are running applications into a single virtual cluster, NLB provides reliability and performance for web servers and other mission-critical servers. The servers in an NLB cluster are called hosts , and each host runs a separate copy of the server applications. NLB distributes incoming client requests across the hosts in the cluster. You can configure the load that is to be handled by each host.
You can also add hosts dynamically to the cluster to handle increased load. NLB can also direct all traffic to a designated single host, which is called the default host. NLB allows all of the computers in the cluster to be addressed by the same set of IP addresses, and it maintains a set of unique, dedicated IP addresses for each host. For load-balanced applications, when a host fails or goes offline, the load is automatically redistributed among the computers that are still operating.
When it is ready, the offline computer can transparently rejoin the cluster and regain its share of the workload, which allows the other computers in the cluster to handle less traffic. NLB is useful for ensuring that stateless applications, such as web servers running Internet Information Services IIS , are available with minimal downtime, and that they are scalable by adding additional servers as the load increases.
The following sections describe how NLB supports high availability, scalability, and manageability of the clustered servers that run these applications. A high availability system reliably provides an acceptable level of service with minimal downtime.
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