LiteSpeed Web Server
A web-server product family from LiteSpeed Technologies. Enterprise and OpenLiteSpeed differ in capabilities and licensing and should not be treated as identical.
Definition and sourcesKNOWLEDGE / FROM A TO Z
Glossary
Technology, explained clearly. Find a term, choose a letter or narrow the topic. Definitions include sources and their review date.
Terms 95 / 685
Clear filtersLoad balancer
A component distributing requests among service instances. It needs health checks and session rules and can itself become a single point of failure.
Definition and sourcesManaged server
A server with defined provider management such as OS updates and monitoring. Scope depends on the agreement and may exclude customer applications.
Definition and sourcesMemcached
A distributed in-memory key-value store used for caching. Data may be evicted; applications must handle an empty cache correctly.
Definition and sourcesModSecurity
A web-application firewall engine analysing HTTP through rules. Effectiveness depends on rulesets, updates and control of false positives.
Definition and sourcesMySQL
A relational database-management system using SQL for data storage and queries with access controls. Licensing and capabilities depend on the distribution and version. The product name alone does not guarantee reliability.
Definition and sourcesNGINX
A web server and reverse proxy supporting proxying, caching and load balancing. Response performance and privacy depend on configuration.
Definition and sourcesNVMe
A communication protocol for nonvolatile storage, often associated with PCIe SSDs. It is an access interface rather than a memory-cell type.
Definition and sourcesObject storage
Storing data as objects with identifiers and metadata, usually through APIs. It is not equivalent to a local disk with identical file semantics.
Definition and sourcesObservability
The ability to infer system state from signals such as logs, metrics and traces. It needs relationships between data, not merely many dashboards.
Definition and sourcesOPcache
PHP's mechanism caching compiled bytecode in shared memory. It reduces repeated parsing; deployments need correct cache freshness handling.
Definition and sourcesPHP FastCGI Process Manager
A PHP process manager handling FastCGI requests, often behind Nginx. Pool, permission and limit configuration affects isolation and application performance.
Definition and sourcesPHP memory_limit
A setting limiting memory a PHP script can allocate. Raising it may help a task but does not fix memory leaks or poor algorithms.
Definition and sourcesphpMyAdmin
A browser-based MySQL and MariaDB administration tool. It needs updates, strong authentication and restricted access rather than treatment as an open public page.
Definition and sourcesPlatform as a service
A service model providing an application runtime with managed infrastructure elements. Responsibility depends on the service; code and data still need protection.
Definition and sourcesPuTTY
A terminal-connection client particularly known for SSH. Obtain it from a trusted source and verify host keys when connecting.
Definition and sourcesQuota
An allocated resource limit, such as storage, file count or API requests. Exceeding it can stop operations despite available system-wide capacity.
Definition and sourcesRedis
A data store using memory and structures including lists, sets and hashes. It can support caching and queues. Durability depends on configuration; Redis need not hold only temporary data.
Definition and sourcesReplication
Copying data changes between instances through a defined mechanism. Replicas can reproduce accidental deletions and therefore do not replace independent backups.
Definition and sourcesReverse proxy
A server accepting client requests and forwarding them to backend services. It may handle TLS or caching and must protect trust headers and private content.
Definition and sourcesrsync
A local and remote file-synchronisation tool reducing unchanged transfers. Deletion options need care; synchronisation is not automatically a versioned backup.
Definition and sourcesRTO and RPO
RTO targets restoration time; RPO targets the tolerable data-loss point in time. These are design objectives requiring recovery-test validation.
Definition and sourcesSaaS (Software as a Service)
Software delivered as a provider-managed service. Customers use the application while the provider maintains its environment. Subscriptions or licences may apply; SaaS does not eliminate costs or every customer responsibility.
Definition and sourcesServer
A program or system providing services to clients, such as HTTP responses or database access. The word also commonly describes its host machine. Servers can operate within local networks without internet access.
Definition and sources