Hyrax

Author: n | 2025-04-24

★★★★☆ (4.2 / 2741 reviews)

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Download Hyrax-1.17.0. James Gallagher . A new software release of the Hyrax data server. Read more. Hyrax Data Server Hyrax Release. Download Hyrax-1.16. There’s more than one type of hyrax. There are three main species of hyrax: the rock hyrax

rescue and smart assistant

HYRAX Model 50.16 - HYRAX Hoogwerkers

The Bible, a rich tapestry of stories, lessons, and wisdom, often draws upon the natural world to illustrate its teachings. Among the creatures mentioned is the hyrax, a small, furry animal that holds a surprising amount of significance. Finding the hyrax in the Bible might seem like a needle in a haystack, but it appears in one specific verse: Proverbs 30:26. This verse, part of a collection of wise sayings, describes the hyrax as a creature that is "weak yet makes its home in the rocks." This seemingly simple detail speaks volumes about the hyrax's resilience and resourcefulness.The Hyrax: A Creature of ParadoxBeyond the Surface: What the Hyrax Teaches UsThe Hyrax: A Symbol of ResilienceThe Hyrax: A Creature of ParadoxThe hyrax, also known as a "rock badger," is a small, herbivorous mammal that resembles a guinea pig with short, rounded ears. They are found in rocky, mountainous regions of Africa, the Middle East, and parts of Asia. Despite their diminutive size, hyraxes are surprisingly well-adapted to their environment.Their small size, coupled with their ability to climb and navigate rocky terrain, allows them to find refuge from predators and access food sources that are out of reach for larger animals. This ability to make their home in the rocks, despite their apparent weakness, is highlighted in Proverbs 30:26. The hyrax serves as a powerful reminder that strength can come in unexpected forms.Beyond the Surface: What the Hyrax Teaches UsProverbs 30:26 isn't just a random observation about a small animal. It is a profound statement about the nature of strength and resilience. The hyrax, despite its lack of physical power, has developed remarkable abilities that allow it to thrive in a challenging environment.Think of a child, seemingly fragile and vulnerable, yet possessing a boundless capacity for learning and adaptation. Or consider a small business, competing against larger corporations, yet finding success through innovation and strategic thinking. These are examples of how the hyrax's story resonates with our own lives, reminding us that strength can be found in unexpected places.The Hyrax: A Symbol of ResilienceThe hyrax is more than just a cute, furry animal. It is a symbol of resilience, resourcefulness, and the power of adaptability. The Bible's portrayal of the hyrax is a subtle reminder that true strength lies not just in physical power, but also in the ability to make the most of our circumstances, find innovative solutions, and persist in 4.3 out of 5 Customer Rating Item No. PRO1012803 4.3 out of 5 Customer Rating 1/10 Hyrax Predator Front/Rear 1.9" Rock Crawling Tires (2) Item No. PRO1012803 Need To Complete PRO1012803 PRO2769031/10 Impulse Front/Rear 1.9" 12mm Rock Crawler Wheels (2) Black PRO1012803 PRO2781001/10 Rock Shooter Aluminum Front/Rear 1.9" 12mm Crawling Wheels (2) PRO1012803 PRO2786001/10 Carbine Front/Rear 1.9" 12mm Rock Crawler Wheels (2) Black $39.94 Price reduced from $46.99 to 0 Item Selected Items Selected The link to 1/10 Hyrax Predator Front/Rear 1.9" Rock Crawling Tires (2) has been copied Product Details Key Features Highly Detailed Sidewall for Scale Looks Stepped Blocks & Multiple Sipes Create Unmatched Grip Tackle Tough Terrain in Scale Style Made in the Legendary Super Soft Predator Compound Made in the USA In The Box (2) Hyrax 1.9" Rock Terrain Truck Tires (2) Open Cell Foam Inserts OverviewThis is a pair of Hyrax 1.9" Rock Crawling Tires in the Super Soft Predator Compound. The future of 1.9" Tire Performance has arrived with Pro-Line's Hyrax Tire! Designed from the ground up for maximum grip on the toughest terrain, the Hyrax tire is ready for anything your Scale Adventure might throw at you. The Hyrax is now available in the softest Rock Crawling Rubber ever made: The Predator Compound! The Super Soft Predator Compound excels on wet or ultra-low traction surfaces to give you grip like you have never experienced before. The Hyrax tire features an aggressive and open tread pattern with each tread block containing multiple Sipes for incredible tread flex. The highly detailed connected tread on the sidewall of the Hyrax extends out for unmatched side-hilling performance. The Hyrax also features futuristic stepped tread blocks that create even more forward gripping edges that dig into slick rock like no other scale tire Pro-Line has produced to date! Don't get left behind spinning your tires, claw your way to the top of the mountain with Pro-Line's Hyrax tires in the new Predator Compound! Lab Certified Select Compounds Specifically Designed for General Rock Crawling Great Grip on a Variety of Surfaces Ultra-long-lasting Rock Crawling Performance Use for Warmer Temperatures Specifically Designed for High Performance Rock Crawling Provides Maximum Grip on Low Grip and Wet Surfaces Super Soft Material Conforms to Any Surface Use for Cooler Temperatures Please note: All tires & wheels are sold in pairs, unless otherwise notedPRO1012803 | Hyrax 1.9” Predator (Super Soft) Rock Terrain Truck Tires

Hyrax - Download all Metal songs Hyrax - Download Latest Album Hyrax

Document (conf/tomcat-users.xml). • JAASRealm - Accesses authentication information through the Java Authentication & Authorization Service (JAAS) framework.Authentication & Authorization Realm and Role configuration is achieved by editing XML files in the Tomcat distribution. Passwords may be saved as clear text, or if desired they may be stored in a digested form. The standard Realms support SHA, MD2, and MD5 digest algorithms.Hyrax LoggingHyrax Installation: Logging • Access Logging - Many people will want to record access logs for their Hyrax server. We want you to keep access logs for your Hyrax server. The easiest way to get a simple access log for Hyrax is to utilize the Tomcat/Catalina Valve Component • Informational/Debug Logging - In general you shouldn't have to modify the default logging configuration for Hyrax. It may become necessary if you encounter problems, but otherwise I suggest you leave it be. Enabling it can both consume disk space and increase your security vulnerability.Hyrax: Logging Access Logging Since Hyrax's public facade is provided by the OLFS running inside of the Tomcat servlet container you may utilize Tomcat's handy access logging which relies on the org.apache.catalina.valves.AccessLogValve class. By default Tomcat comes with this turned off. It can be easily enabled by editing an XML file in the Tomcat distribution.Hyrax: Logging Informational and Debug Logging in the OLFS The OLFS uses the Log4j logging package to provide an easily configurable and flexible logging environment. All "console" output is routed through the Log4j package and can be controlled using the Log4j configuration file. Log4j allows the user to control logging output in a hierarchical manner from the (java) package down to the individual class level.Hyrax: Logging Informational and Debug Logging in the BES The BES has two forms of logging. • Event logging in a bes.log file. This is configured in the bes.conf file: • BES.LogName=/path/to/bes.log • BES.LogVerbose=no • Debug logging for the BES • besctl start -d “/path/to/bes.debug,nc,bes,ppt”BES Debugging • Format of the command line option -d • “cerr|,,…,” • E.g. -d “/tmp/bes.debug,nc,bes” • Specify a context of “all” to turn on debugging for everything • Writing debug statements in your code • Macro BESDEBUG( “”, ) • E.g. BESDEBUG( “nc”, “reading DAS for “ ::const_iterator i = _somelist.begin() ; while( ; i != _somelist.end(); i++ ) BESDEBUG( “nc”, ““ BES Debugging Most BES classes derived from BESObj, and some libdap class derived from DapObj • You can dump BESObj instances and DapObj instances to ostream • virtual void dump( ostream &strm ) ; • E.g. DAS &das ; BESDEBUG( “nc”, “DAS = “ BES Debugging - dump method example. Download Hyrax-1.17.0. James Gallagher . A new software release of the Hyrax data server. Read more. Hyrax Data Server Hyrax Release. Download Hyrax-1.16. There’s more than one type of hyrax. There are three main species of hyrax: the rock hyrax

Expander appliances: A. Mini Hyrax; B. Hyrax

OLFS BES Data Hyrax Architecture • Two cooperating processes: • Front-end provides DAP interface • Back-end reads data • Both parts can be customized • Front-end: different network protocols • Back-end: different data formats/systems • N-Tier design is flexible, secureHyrax Architecture • Front-end (OLFS): • Authentication & Authorization (via Tomcat) • DAP2 compliant interface. • SOAP interface. • Extensible via pluggable dispatch handlers • Back-end (BES): • Data resource access. • Extensible (see Patrick’s slides) • Single/Multiple Machine Installations • SecurityOLFS BES Java Servlet Engine Unix Daemon Hyrax Architecture BES Commands DAP2 THREDDS HTML XML- encapsulated object Data Store Optional THREDDS catalogs File system with data files, SQL Database, …OLFS and Authorization/Authentication • Authorization & Authentication (Az/Ac) actually provided by Apache or Tomcat • Apache/Tomcat provides a range of Az/Ac features: • Realms: Role-based Az/Ac • Usernames & passwords -> Authorization • Roles -> Authentication • Realm info in RDBs, XML docs, LDAP, … • TLS/SSL: • Server and client Az/Ac • Secure data transmission • Tomcat provides single sign-on capabilities • Clients must support cookies • Suitable for portalsPossible Installations • Both OLFS and BES run on one machine • OLFS on one machine and BES on another • One OLFS and several instances of BES on different machines • OLFS communicating with one or more BESs and other backend processorsHyrax Architecture Summary • Hyrax can be installed on one machine or several • Installation security merits serious consideration • Authentication & Authorization are handled by the web servers (Tomcat and Apache)Extending the OLFS • Extension ‘modules’ written in Java • Added to a directory within Tomcat • The new modules have complete access to the request information • Both HTTP GET and POST requests • There is some significant processing done before the handler is called: • Conditional GET Requests • Authorization & Authentication The OLFS uses an ordered list of Dispatch Handlers. • Each handler on the list is asked if it can handle the incoming request. • The first handler on the list that claims the request gets to handle it. • List order is important, as some handlers (for example THREDDS) may claim to handle requests that could (should) be handled by a different handler. • Handlers are free to do anything they need to handle a request: Contact a remote system/process, read files, spawn threads, et cetera. OLFS Dispatch HandlersExtending the BES • Extension ‘modules’ written in C or C++ • Download already existing modules • Write new modules • Add these modules to the BES configuration file to be dynamically loaded • Modules interact with the BES and can interact with other modules • Modules add to, or modify functionality in, the BES FrameworkBES BES Framework Network Protocol and Process start/stop activities PPT* Initialization/ Termination DAP2 Access Data Catalogs BES Commands/ XML Documents Commands** NetCDF3 HDF4 FreeForm Data Store Interfaces … *PPT: point to point transport **Some commands are built in, most load at run-timeBES Extensibility In what ways can you extend the BES? • New request handlers (data handlers like netcdf, hdf4) • New response handlers (Cedar's Flat, Tab, Info) • New commands (ESG’s commit command) • Container and Definition storage • Aggregation engines • Methods of returning your data (return as nc) • Initialization/Termination callbacks • Exception Handlers • ReportersTHREDDS CatalogsTHREDDS responses • Use THREDDS to define a logical hierarchy that’s distinct from the set of directories that actually hold the data. • We can request THREDDS catalog XML files using ‘catalog.xml’ or HTML pages using ‘catalog.html’ after a directory name. • While the directory browser works for any directory, THREDDS catalogs are valid only for the logical hierarchy they define • Files/Directories not included in that hierarchy have no catalogs THREDDS examples • Switch Hyrax to the THREDDS HTML view: Choose the HTML viewThe THREDDS HTML view • The top-level THREDDS catalog on our test server defines a single data root directory (SVN Test Data Archive) • This illustrates how THREDDS can be used to control the view of data presented by the server • Use ‘catalog.xml’ in place of ‘catalog.html’ to get the catalog data in an XML document.Traverse the links to find dataTHREDDS data set page • THREDDS catalogs can list more than one access mechanism - here we see on the DAP, but WCS, WMS, et c., are other possibilitiesChoosing DAP access leads to the HTML formSecurity: Authentication & AuthorizationAuthentication & Authorization Hyrax currently relies on the security features implemented by Tomcat for authentication and authorization services. The Tomcat authentication model is based on Realms and roles. • A Realm is a “database” of usernames and passwords that identify valid users of a web application. • A role is similar to a UNIX group because access to to resources is granted to all users possesing a particular role. A particular user can have any number of roles.Authentication & Authorization Tomcat supports 5 standard plug-ins that support connections to various sources of authentication (Realms)Authentication & Authorization • JDBCRealm - Accesses authentication information stored in a relational database, accessed via a JDBC driver. • DataSourceRealm - Accesses authentication information stored in a relational database, accessed via a named JNDI JDBC DataSource. • JNDIRealm - Accesses authentication information stored in an LDAP based directory server, accessed via a JNDI provider.Authentication & Authorization • MemoryRealm - Accesses authentication information stored in an in-memory object collection, which is initialized from an XML

Welcome to r/Hyrax : r/hyrax - Reddit

• Crested Porcupine • Common Chimpanzee • Chacma Baboon • Common Hippopotamus • Domestic Water Buffalo • Dragonfly • Egyptian Cobra • Ethiopian Wolf • Elk • Emperor Scorpion • Four-toed Hedgehog • Fire Skink • Greater Kudu • Gemsbok • Giant Eland • Grey Crowned Crane • Great Blue Turaco • Giant African Snail • Green Bee-Eater • Greater Flamingo • Grant's Zebra • Grey-Headed Bushshrike • Greylag Goose • Genet • Ground Pangolin • Gynanisa Maja • Glossina Morsitans Morsitans • Giant Teratorns • Honey Badger • Hippopotamus • Housefly • Hamerkop • Horned Gopher • Impala • Klipspringer • Kelenken • Ladybug • Lesser Egyptian Jerboa • Lygodactylus Williamsi • Meerkat • Mandrill • Morpho Butterfly • Martial Eagle • Macroeuphractus • Moeritheriums • Nile Crocodile • Nuttaliella • Oxpecker • Okapi • Olive Baboon • Plains Zebra • Pied Crow • Paraceratheriums • Quagga • Red-Crowned Crane • Ruppell's Vulture • Rock Hyrax • Rock Monitor Lizard • Reticulated Giraffe • Spotted Hyena • Sable Antelope • Senegal Bushbaby • Scrub Hare • Serval • Southern Red Bishop • Sclerophrys Regularis • Smith's Red Rock Hare • Scincus Scincus • Smilodon • Thomson's Gazelle • Tanzanian Red-Billed Hornbill • Trachylepis Striata • Trachylepis Sulcata • Trachylepis • Trachylepis Quinquetaeniata • Veiled Chameleon • Vervet Monkey • West African Giraffe • White-Backed Vulture • Wildebeest • Western Honey Bee • Western Yellow Wagtail • White-Necked Raven • White Rhinoceros • Yellow-Billed Stork • Yellow Baboon • Yellow

(a) Conventional hyrax expander; (b) hybrid hyrax

Two to three million years ago. The original volcano’s height was estimated to be between 4,500 and 5,800 meters (14,800 and 19,000 ft). Above sea level, the crater bottom is 1,800 meters (5,900 ft). In February 2013, the crater was named one of Africa’s Seven Natural Wonders.Ngorongoro Crater FlamingosVolcanic eruptions, such as the one that formed the Ngorongoro Crater are common In Tanzania since Similar collapses occurred at Olmoti and Empakai, but their scale and impact were far smaller. Both of the Ngorongoro craters are well-known and amazing natural wonders that you should not miss seeing if you want to make your safari experience/ tour memorable and pleasurable.Lerai Fever Tree ForestElephants, rhinos, eland, bushbuck, hyrax, and hundreds of birds frequent the Lerai Fever Tree Forest, which is made up of tall, narrow yellow-barked acacias that make an airy, lace-canopied fantasy of glades. The uncommon black rhinoceros prefers this vegetation, but the old forest is rebuilding slowly due to elephant damage, which involves tearing off whole branches rather than simply grazing. During the dry season, however, saplings are spreading through the Gorigor Swamps, which are home to hippopotamus and wading birds and a favorite drinking spot for hundreds of ungulates. It’s yet another interesting tourist destination to see on your safari in the Ngorongoro conservation region.Olduvai Gorge and LaetoliIn the Rift Valley, Lake Ndutu and Lake Masek are also on the migratory path, not far from Olduvai Gorge, where humanity’s forefathers began the trek towards civilization with the production of the first tools and the construction of the first human dwellings. Hominid footprints of our genetic forebears and relatives have been discovered in 3.7 million-year-old sedimentary rock at Laetoli.A guided tour of the excavations and a small paleoanthropological museum in Olduvai, where you can also observe evolutionary fossils, is a must-do on any Tanzania safari. Shifting SandsIf you believe that hearing that sand can shift or move from one place to another is magical but you also believe that it is impossible for a larger group of sand to move from one place to another, we recommend that you take your time and book a safari in the Ngorongoro conservation area to witness this kind of impossible that is now possible, Tourist Attractions at Ngorongoro Conservation Area.The Sands of Time This amazing black dune, made mostly of volcanic ash from Oldonyo Lengai, is slowly moving westward across the plains at a rate of roughly 17 meters per year. It can be found nine meters high and 100 meters long in its curve to the north of Olduvai Gorge. It is yet another fascinating tourist destination/attraction to visit during your safari tour or vacation in Tanzania.Olmoti Crater and Empakai Crater.Focus East Africa. Download Hyrax-1.17.0. James Gallagher . A new software release of the Hyrax data server. Read more. Hyrax Data Server Hyrax Release. Download Hyrax-1.16. There’s more than one type of hyrax. There are three main species of hyrax: the rock hyrax

Rock Hyrax : Hyrax Closest Living Relative to the

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User1000

The Bible, a rich tapestry of stories, lessons, and wisdom, often draws upon the natural world to illustrate its teachings. Among the creatures mentioned is the hyrax, a small, furry animal that holds a surprising amount of significance. Finding the hyrax in the Bible might seem like a needle in a haystack, but it appears in one specific verse: Proverbs 30:26. This verse, part of a collection of wise sayings, describes the hyrax as a creature that is "weak yet makes its home in the rocks." This seemingly simple detail speaks volumes about the hyrax's resilience and resourcefulness.The Hyrax: A Creature of ParadoxBeyond the Surface: What the Hyrax Teaches UsThe Hyrax: A Symbol of ResilienceThe Hyrax: A Creature of ParadoxThe hyrax, also known as a "rock badger," is a small, herbivorous mammal that resembles a guinea pig with short, rounded ears. They are found in rocky, mountainous regions of Africa, the Middle East, and parts of Asia. Despite their diminutive size, hyraxes are surprisingly well-adapted to their environment.Their small size, coupled with their ability to climb and navigate rocky terrain, allows them to find refuge from predators and access food sources that are out of reach for larger animals. This ability to make their home in the rocks, despite their apparent weakness, is highlighted in Proverbs 30:26. The hyrax serves as a powerful reminder that strength can come in unexpected forms.Beyond the Surface: What the Hyrax Teaches UsProverbs 30:26 isn't just a random observation about a small animal. It is a profound statement about the nature of strength and resilience. The hyrax, despite its lack of physical power, has developed remarkable abilities that allow it to thrive in a challenging environment.Think of a child, seemingly fragile and vulnerable, yet possessing a boundless capacity for learning and adaptation. Or consider a small business, competing against larger corporations, yet finding success through innovation and strategic thinking. These are examples of how the hyrax's story resonates with our own lives, reminding us that strength can be found in unexpected places.The Hyrax: A Symbol of ResilienceThe hyrax is more than just a cute, furry animal. It is a symbol of resilience, resourcefulness, and the power of adaptability. The Bible's portrayal of the hyrax is a subtle reminder that true strength lies not just in physical power, but also in the ability to make the most of our circumstances, find innovative solutions, and persist in

2025-04-08
User3836

4.3 out of 5 Customer Rating Item No. PRO1012803 4.3 out of 5 Customer Rating 1/10 Hyrax Predator Front/Rear 1.9" Rock Crawling Tires (2) Item No. PRO1012803 Need To Complete PRO1012803 PRO2769031/10 Impulse Front/Rear 1.9" 12mm Rock Crawler Wheels (2) Black PRO1012803 PRO2781001/10 Rock Shooter Aluminum Front/Rear 1.9" 12mm Crawling Wheels (2) PRO1012803 PRO2786001/10 Carbine Front/Rear 1.9" 12mm Rock Crawler Wheels (2) Black $39.94 Price reduced from $46.99 to 0 Item Selected Items Selected The link to 1/10 Hyrax Predator Front/Rear 1.9" Rock Crawling Tires (2) has been copied Product Details Key Features Highly Detailed Sidewall for Scale Looks Stepped Blocks & Multiple Sipes Create Unmatched Grip Tackle Tough Terrain in Scale Style Made in the Legendary Super Soft Predator Compound Made in the USA In The Box (2) Hyrax 1.9" Rock Terrain Truck Tires (2) Open Cell Foam Inserts OverviewThis is a pair of Hyrax 1.9" Rock Crawling Tires in the Super Soft Predator Compound. The future of 1.9" Tire Performance has arrived with Pro-Line's Hyrax Tire! Designed from the ground up for maximum grip on the toughest terrain, the Hyrax tire is ready for anything your Scale Adventure might throw at you. The Hyrax is now available in the softest Rock Crawling Rubber ever made: The Predator Compound! The Super Soft Predator Compound excels on wet or ultra-low traction surfaces to give you grip like you have never experienced before. The Hyrax tire features an aggressive and open tread pattern with each tread block containing multiple Sipes for incredible tread flex. The highly detailed connected tread on the sidewall of the Hyrax extends out for unmatched side-hilling performance. The Hyrax also features futuristic stepped tread blocks that create even more forward gripping edges that dig into slick rock like no other scale tire Pro-Line has produced to date! Don't get left behind spinning your tires, claw your way to the top of the mountain with Pro-Line's Hyrax tires in the new Predator Compound! Lab Certified Select Compounds Specifically Designed for General Rock Crawling Great Grip on a Variety of Surfaces Ultra-long-lasting Rock Crawling Performance Use for Warmer Temperatures Specifically Designed for High Performance Rock Crawling Provides Maximum Grip on Low Grip and Wet Surfaces Super Soft Material Conforms to Any Surface Use for Cooler Temperatures Please note: All tires & wheels are sold in pairs, unless otherwise notedPRO1012803 | Hyrax 1.9” Predator (Super Soft) Rock Terrain Truck Tires

2025-04-20
User8232

Document (conf/tomcat-users.xml). • JAASRealm - Accesses authentication information through the Java Authentication & Authorization Service (JAAS) framework.Authentication & Authorization Realm and Role configuration is achieved by editing XML files in the Tomcat distribution. Passwords may be saved as clear text, or if desired they may be stored in a digested form. The standard Realms support SHA, MD2, and MD5 digest algorithms.Hyrax LoggingHyrax Installation: Logging • Access Logging - Many people will want to record access logs for their Hyrax server. We want you to keep access logs for your Hyrax server. The easiest way to get a simple access log for Hyrax is to utilize the Tomcat/Catalina Valve Component • Informational/Debug Logging - In general you shouldn't have to modify the default logging configuration for Hyrax. It may become necessary if you encounter problems, but otherwise I suggest you leave it be. Enabling it can both consume disk space and increase your security vulnerability.Hyrax: Logging Access Logging Since Hyrax's public facade is provided by the OLFS running inside of the Tomcat servlet container you may utilize Tomcat's handy access logging which relies on the org.apache.catalina.valves.AccessLogValve class. By default Tomcat comes with this turned off. It can be easily enabled by editing an XML file in the Tomcat distribution.Hyrax: Logging Informational and Debug Logging in the OLFS The OLFS uses the Log4j logging package to provide an easily configurable and flexible logging environment. All "console" output is routed through the Log4j package and can be controlled using the Log4j configuration file. Log4j allows the user to control logging output in a hierarchical manner from the (java) package down to the individual class level.Hyrax: Logging Informational and Debug Logging in the BES The BES has two forms of logging. • Event logging in a bes.log file. This is configured in the bes.conf file: • BES.LogName=/path/to/bes.log • BES.LogVerbose=no • Debug logging for the BES • besctl start -d “/path/to/bes.debug,nc,bes,ppt”BES Debugging • Format of the command line option -d • “cerr|,,…,” • E.g. -d “/tmp/bes.debug,nc,bes” • Specify a context of “all” to turn on debugging for everything • Writing debug statements in your code • Macro BESDEBUG( “”, ) • E.g. BESDEBUG( “nc”, “reading DAS for “ ::const_iterator i = _somelist.begin() ; while( ; i != _somelist.end(); i++ ) BESDEBUG( “nc”, ““ BES Debugging Most BES classes derived from BESObj, and some libdap class derived from DapObj • You can dump BESObj instances and DapObj instances to ostream • virtual void dump( ostream &strm ) ; • E.g. DAS &das ; BESDEBUG( “nc”, “DAS = “ BES Debugging - dump method example

2025-04-14
User4677

OLFS BES Data Hyrax Architecture • Two cooperating processes: • Front-end provides DAP interface • Back-end reads data • Both parts can be customized • Front-end: different network protocols • Back-end: different data formats/systems • N-Tier design is flexible, secureHyrax Architecture • Front-end (OLFS): • Authentication & Authorization (via Tomcat) • DAP2 compliant interface. • SOAP interface. • Extensible via pluggable dispatch handlers • Back-end (BES): • Data resource access. • Extensible (see Patrick’s slides) • Single/Multiple Machine Installations • SecurityOLFS BES Java Servlet Engine Unix Daemon Hyrax Architecture BES Commands DAP2 THREDDS HTML XML- encapsulated object Data Store Optional THREDDS catalogs File system with data files, SQL Database, …OLFS and Authorization/Authentication • Authorization & Authentication (Az/Ac) actually provided by Apache or Tomcat • Apache/Tomcat provides a range of Az/Ac features: • Realms: Role-based Az/Ac • Usernames & passwords -> Authorization • Roles -> Authentication • Realm info in RDBs, XML docs, LDAP, … • TLS/SSL: • Server and client Az/Ac • Secure data transmission • Tomcat provides single sign-on capabilities • Clients must support cookies • Suitable for portalsPossible Installations • Both OLFS and BES run on one machine • OLFS on one machine and BES on another • One OLFS and several instances of BES on different machines • OLFS communicating with one or more BESs and other backend processorsHyrax Architecture Summary • Hyrax can be installed on one machine or several • Installation security merits serious consideration • Authentication & Authorization are handled by the web servers (Tomcat and Apache)Extending the OLFS • Extension ‘modules’ written in Java • Added to a directory within Tomcat • The new modules have complete access to the request information • Both HTTP GET and POST requests • There is some significant processing done before the handler is called: • Conditional GET Requests • Authorization & Authentication The OLFS uses an ordered list of Dispatch Handlers. • Each handler on the list is asked if it can handle the incoming request. • The first handler on the list that claims the request gets to handle it. • List order is important, as some handlers (for example THREDDS) may claim to handle requests that could (should) be handled by a different handler. • Handlers are free to do anything they need to handle a request: Contact a remote system/process, read files, spawn threads, et cetera. OLFS Dispatch HandlersExtending the BES • Extension ‘modules’ written in C or C++ • Download already existing modules • Write new modules • Add these modules to the BES configuration file to be dynamically loaded • Modules interact with the BES and can interact with other modules • Modules add to, or modify functionality in, the BES

2025-04-04
User4869

FrameworkBES BES Framework Network Protocol and Process start/stop activities PPT* Initialization/ Termination DAP2 Access Data Catalogs BES Commands/ XML Documents Commands** NetCDF3 HDF4 FreeForm Data Store Interfaces … *PPT: point to point transport **Some commands are built in, most load at run-timeBES Extensibility In what ways can you extend the BES? • New request handlers (data handlers like netcdf, hdf4) • New response handlers (Cedar's Flat, Tab, Info) • New commands (ESG’s commit command) • Container and Definition storage • Aggregation engines • Methods of returning your data (return as nc) • Initialization/Termination callbacks • Exception Handlers • ReportersTHREDDS CatalogsTHREDDS responses • Use THREDDS to define a logical hierarchy that’s distinct from the set of directories that actually hold the data. • We can request THREDDS catalog XML files using ‘catalog.xml’ or HTML pages using ‘catalog.html’ after a directory name. • While the directory browser works for any directory, THREDDS catalogs are valid only for the logical hierarchy they define • Files/Directories not included in that hierarchy have no catalogs THREDDS examples • Switch Hyrax to the THREDDS HTML view: Choose the HTML viewThe THREDDS HTML view • The top-level THREDDS catalog on our test server defines a single data root directory (SVN Test Data Archive) • This illustrates how THREDDS can be used to control the view of data presented by the server • Use ‘catalog.xml’ in place of ‘catalog.html’ to get the catalog data in an XML document.Traverse the links to find dataTHREDDS data set page • THREDDS catalogs can list more than one access mechanism - here we see on the DAP, but WCS, WMS, et c., are other possibilitiesChoosing DAP access leads to the HTML formSecurity: Authentication & AuthorizationAuthentication & Authorization Hyrax currently relies on the security features implemented by Tomcat for authentication and authorization services. The Tomcat authentication model is based on Realms and roles. • A Realm is a “database” of usernames and passwords that identify valid users of a web application. • A role is similar to a UNIX group because access to to resources is granted to all users possesing a particular role. A particular user can have any number of roles.Authentication & Authorization Tomcat supports 5 standard plug-ins that support connections to various sources of authentication (Realms)Authentication & Authorization • JDBCRealm - Accesses authentication information stored in a relational database, accessed via a JDBC driver. • DataSourceRealm - Accesses authentication information stored in a relational database, accessed via a named JNDI JDBC DataSource. • JNDIRealm - Accesses authentication information stored in an LDAP based directory server, accessed via a JNDI provider.Authentication & Authorization • MemoryRealm - Accesses authentication information stored in an in-memory object collection, which is initialized from an XML

2025-04-10

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