Nagios is an open-source monitoring solution that enables system administrators to effectively track the status of network, applications, services, operation system, and other critical components of their IT infrastructure. Network traffic and log analyzing tools dramatically simplify network management and troubleshooting while overall improve system stability by enabling system administrators to apply preventive measures on a timely basis.
Native VLAN is an untagged VLAN on a tagged port.
The nodes in the OpenStack environment communicate with each other by using a supported network topology. Fuel supports Neutron with VLAN or GRE segmentation, VXLAN, as well as such technologies as VMware DVS and NSXv through corresponding plug-ins.
The OpenStack Networking service, or Neutron, provides networking to all components of an OpenStack environment. Neutron provides networking as a service between interface devices such as vNICS that are managed by other OpenStack services such as Nova.
The Neutron Modular Layer 2 (ML2) plug-in is a framework that allows OpenStack Neutron networking to simultaneously use a variety of Layer 2 networking technologies.
The following types of ML2 drivers can be implemented:
Mechanism drivers manage network mechanisms. They create, update, and delete network and port resources. For each action, the following methods are exposed:
Network File System (NFS) is a sharing protocol that enables users to create and manages files located on a remote server over a network. NFS provides a mechanism to configure an access control list (ACL) on a per user and group basis. Depending on the assigned permissions, users have read and write or read-only access to an NFS folder.
Network function virtualization (NFV) is an approach to network architecture design that divides network functions, such as firewalling, Domain Name Service (DNS), load balancing, and so on into separate virtualized pieces of IT infrastructure.
A node is a physical or virtual server that is provisioned to run a specific set of OpenStack services. Nodes are identified by virtual roles that is configured for the node during the environment deployment or later when a cloud administrator expands the cloud by adding new nodes. Internally, nodes are identified by a node ID that Fuel assigns automatically. For example, node-1, node-2, and so on. The node ID can be used to SSH to a node and is used to identify a specific node in a CLI command.
A node network group, or a node group, is a set of isolated nodes grouped by networks. When you create an OpenStack environment, Fuel automatically configures a default node group. If you need to separate a group of nodes from other nodes within one OpenStack environment, you can add node groups. The node groups share and communicate with each other through the Admin network. Other networks created by Fuel or by the cloud administrator within one node group are isolated from the corresponding networks in the other node group.