Skip to main content

Home/ Larvata/ Group items tagged web

Rss Feed Group items tagged

Filter: All | Bookmarks | Topics Simple Middle
crazylion lee

GitHub - GoogleChrome/lighthouse: Auditing, performance metrics, and best practices for... - 0 views

github.com/...lighthouse

pwa

shared by crazylion lee on 15 Apr 18 - No Cached
  • crazylion lee on 15 Apr 18
     
    "Auditing, performance metrics, and best practices for Progressive Web Apps"
crazylion lee

Instant.io - Streaming file transfer over WebTorrent - 0 views

instant.io

torrent web bt

shared by crazylion lee on 27 Sep 16 - No Cached
  • crazylion lee on 27 Sep 16
     
    "Streaming file transfer over WebTorrent (torrents on the web)"
crazylion lee

Thimble by Mozilla - An online code editor for learners & educators. - 0 views

thimble.mozilla.org/en-US

HTML coding ide web

shared by crazylion lee on 27 Sep 16 - No Cached
  • crazylion lee on 27 Sep 16
     
    "Thimble is an online code editor that makes it easy to create and publish your own web pages while learning HTML, CSS & JavaScript."
張 旭

DNS - FreeIPA - 0 views

www.freeipa.org/DNS

dns networking system bind freeipa

shared by 張 旭 on 30 Aug 19 - No Cached
  • FreeIPA DNS integration allows administrator to manage and serve DNS records in a domain using the same CLI or Web UI as when managing identities and policies.
  • Single-master DNS is error prone, especially for inexperienced admins.
  • a decent Kerberos experience.
  • ...14 more annotations...
  • Goal is NOT to provide general-purpose DNS server.
  • DNS component in FreeIPA is optional and user may choose to manage all DNS records manually in other third party DNS server.
  • Clients can be configured to automatically run DNS updates (nsupdate) when their IP address changes and thus keeping its DNS record up-to-date. DNS zones can be configured to synchronize client's reverse (PTR) record along with the forward (A, AAAA) DNS record.
  • It is extremely hard to change DNS domain in existing installations so it is better to think ahead.
  • You should only use names which are delegated to you by the parent domain.
  • Not respecting this rule will cause problems sooner or later!
  • DNSSEC validation.
  • For internal names you can use arbitrary sub-domain in a DNS sub-tree you own, e.g. int.example.com.. Always respect rules from the previous section.
  • General advice about DNS views is do not use them because views make DNS deployment harder to maintain and security benefits are questionable (when compared with ACL).
  • The DNS integration is based on the bind-dyndb-ldap project, which enhances BIND name server to be able to use FreeIPA server LDAP instance as a data backend (data are stored in cn=dns entry, using schema defined by bind-dyndb-ldap
  • FreeIPA LDAP directory information tree is by default accessible to any user in the network
  • As DNS data are often considered as sensitive and as having access to cn=dns tree would be basically equal to being able to run zone transfer to all FreeIPA managed DNS zones, contents of this tree in LDAP are hidden by default.
  • standard system log (/var/log/messages or system journal)
  • BIND configuration (/etc/named.conf) can be updated to produce a more detailed log.
  • 張 旭 on 30 Aug 19
     
    "FreeIPA DNS integration allows administrator to manage and serve DNS records in a domain using the same CLI or Web UI as when managing identities and policies."
張 旭

Understanding Nginx Server and Location Block Selection Algorithms | DigitalOcean - 0 views

www.digitalocean.com/...ion-block-selection-algorithms

web server nginx config

shared by 張 旭 on 03 Feb 20 - No Cached
  • A server block is a subset of Nginx’s configuration that defines a virtual server used to handle requests of a defined type. Administrators often configure multiple server blocks and decide which block should handle which connection based on the requested domain name, port, and IP address.
  • A location block lives within a server block and is used to define how Nginx should handle requests for different resources and URIs for the parent server. The URI space can be subdivided in whatever way the administrator likes using these blocks. It is an extremely flexible model.
  • Nginx logically divides the configurations meant to serve different content into blocks, which live in a hierarchical structure. Each time a client request is made, Nginx begins a process of determining which configuration blocks should be used to handle the request.
  • ...37 more annotations...
  • Nginx is one of the most popular web servers in the world. It can successfully handle high loads with many concurrent client connections, and can easily function as a web server, a mail server, or a reverse proxy server.
  • The main server block directives that Nginx is concerned with during this process are the listen directive, and the server_name directive.
  • The listen directive typically defines which IP address and port that the server block will respond to.
  • 0.0.0.0:8080 if Nginx is being run by a normal, non-root user
  • Nginx translates all “incomplete” listen directives by substituting missing values with their default values so that each block can be evaluated by its IP address and port.
  • In any case, the port must be matched exactly.
  • If there are multiple server blocks with the same level of specificity matching, Nginx then begins to evaluate the server_name directive of each server block.
  • Nginx will only evaluate the server_name directive when it needs to distinguish between server blocks that match to the same level of specificity in the listen directive.
  • Nginx checks the request’s “Host” header. This value holds the domain or IP address that the client was actually trying to reach.
  • Nginx will first try to find a server block with a server_name that matches the value in the “Host” header of the request exactly.
  • If no exact match is found, Nginx will then try to find a server block with a server_name that matches using a leading wildcard (indicated by a * at the beginning of the name in the config).
  • If no match is found using a leading wildcard, Nginx then looks for a server block with a server_name that matches using a trailing wildcard (indicated by a server name ending with a * in the config)
  • If no match is found using a trailing wildcard, Nginx then evaluates server blocks that define the server_name using regular expressions (indicated by a ~ before the name).
  • If no regular expression match is found, Nginx then selects the default server block for that IP address and port.
  • There can be only one default_server declaration per each IP address/port combination.
  • Location blocks live within server blocks (or other location blocks) and are used to decide how to process the request URI (the part of the request that comes after the domain name or IP address/port).
  • If no modifiers are present, the location is interpreted as a prefix match.
  • =: If an equal sign is used, this block will be considered a match if the request URI exactly matches the location given.
  • ~: If a tilde modifier is present, this location will be interpreted as a case-sensitive regular expression match.
  • ~*: If a tilde and asterisk modifier is used, the location block will be interpreted as a case-insensitive regular expression match.
  • ^~: If a carat and tilde modifier is present, and if this block is selected as the best non-regular expression match, regular expression matching will not take place.
  • Keep in mind that if this block is selected and the request is fulfilled using an index page, an internal redirect will take place to another location that will be the actual handler of the request
  • Keeping in mind the types of location declarations we described above, Nginx evaluates the possible location contexts by comparing the request URI to each of the locations.
  • Nginx begins by checking all prefix-based location matches (all location types not involving a regular expression).
  • First, Nginx looks for an exact match.
  • If no exact (with the = modifier) location block matches are found, Nginx then moves on to evaluating non-exact prefixes.
  • After the longest matching prefix location is determined and stored, Nginx moves on to evaluating the regular expression locations (both case sensitive and insensitive).
  • by default, Nginx will serve regular expression matches in preference to prefix matches.
  • regular expression matches within the longest prefix match will “jump the line” when Nginx evaluates regex locations.
  • The exceptions to the “only one location block” rule may have implications on how the request is actually served and may not align with the expectations you had when designing your location blocks.
  • The index directive always leads to an internal redirect if it is used to handle the request.
  • In the case above, if you really need the execution to stay in the first block, you will have to come up with a different method of satisfying the request to the directory.
  • one way of preventing an index from switching contexts, but it’s probably not useful for most configurations
  • the try_files directive. This directive tells Nginx to check for the existence of a named set of files or directories.
  • the rewrite directive. When using the last parameter with the rewrite directive, or when using no parameter at all, Nginx will search for a new matching location based on the results of the rewrite.
  • The error_page directive can lead to an internal redirect similar to that created by try_files.
  • when certain status codes are encountered.
張 旭

An Introduction to HAProxy and Load Balancing Concepts | DigitalOcean - 0 views

www.digitalocean.com/...xy-and-load-balancing-concepts

server haproxy loading HA architecture

shared by 張 旭 on 07 Dec 17 - No Cached
  • HAProxy, which stands for High Availability Proxy
  • improve the performance and reliability of a server environment by distributing the workload across multiple servers (e.g. web, application, database).
  • ACLs are used to test some condition and perform an action (e.g. select a server, or block a request) based on the test result.
  • ...28 more annotations...
  • Access Control List (ACL)
  • ACLs allows flexible network traffic forwarding based on a variety of factors like pattern-matching and the number of connections to a backend
  • A backend is a set of servers that receives forwarded requests
  • adding more servers to your backend will increase your potential load capacity by spreading the load over multiple servers
  • mode http specifies that layer 7 proxying will be used
  • specifies the load balancing algorithm
  • health checks
  • A frontend defines how requests should be forwarded to backends
  • use_backend rules, which define which backends to use depending on which ACL conditions are matched, and/or a default_backend rule that handles every other case
  • A frontend can be configured to various types of network traffic
  • Load balancing this way will forward user traffic based on IP range and port
  • Generally, all of the servers in the web-backend should be serving identical content--otherwise the user might receive inconsistent content.
  • Using layer 7 allows the load balancer to forward requests to different backend servers based on the content of the user's request.
  • allows you to run multiple web application servers under the same domain and port
  • acl url_blog path_beg /blog matches a request if the path of the user's request begins with /blog.
  • Round Robin selects servers in turns
  • Selects the server with the least number of connections--it is recommended for longer sessions
  • This selects which server to use based on a hash of the source IP
  • ensure that a user will connect to the same server
  • require that a user continues to connect to the same backend server. This persistence is achieved through sticky sessions, using the appsession parameter in the backend that requires it.
  • HAProxy uses health checks to determine if a backend server is available to process requests.
  • The default health check is to try to establish a TCP connection to the server
  • If a server fails a health check, and therefore is unable to serve requests, it is automatically disabled in the backend
  • For certain types of backends, like database servers in certain situations, the default health check is insufficient to determine whether a server is still healthy.
  • However, your load balancer is a single point of failure in these setups; if it goes down or gets overwhelmed with requests, it can cause high latency or downtime for your service.
  • A high availability (HA) setup is an infrastructure without a single point of failure
  • a static IP address that can be remapped from one server to another.
  • If that load balancer fails, your failover mechanism will detect it and automatically reassign the IP address to one of the passive servers.
crazylion lee

AWS IoT Button - 0 views

aws.amazon.com/button

aws button iot ifttt

shared by crazylion lee on 24 May 16 - No Cached
  • crazylion lee on 24 May 16
     
    "限量發行的可程式化 Dash Button AWS IoT Button 是一個以 Amazon Dash Button 硬體為基礎的可程式化按鈕。這個簡單的 Wi-Fi 裝置非常容易設定，而且它的設計目的是讓開發人員開始使用 AWS IoT、AWS Lambda、Amazon DynamoDB、Amazon SNS 以及許多其他 Amazon Web Services，不需要撰寫裝置特定的程式碼。"
crazylion lee

henryboldi/felony: - 0 views

github.com/felony

felony pgp password

shared by crazylion lee on 17 Aug 16 - No Cached
  • crazylion lee on 17 Aug 16
     
    "Felony is an open-source pgp keychain built on the modern web with Electron, React, and Redux. Felony is the first PGP app that's easy for anyone to use, without a tutorial. Security++ to the greatest extreme!"
crazylion lee

JavaScript Systems Music - 1 views

teropa.info/...javascript-systems-music.html

music javascript audio

shared by crazylion lee on 05 Nov 16 - No Cached
  • crazylion lee on 05 Nov 16
     
    "Learning Web Audio by Recreating The Works of Steve Reich and Brian Eno"
crazylion lee

Task Management for Teams - MeisterTask - 0 views

www.meistertask.com

tasks management productivity collaboration projectmanagement

shared by crazylion lee on 24 Nov 16 - No Cached
  • crazylion lee on 24 Nov 16
     
    "The most intuitive project and task management tool on the web"
張 旭

Which Ruby background job framework is right for you? - 0 views

blog.scoutapp.com/...job-framework-is-right-for-you

background ruby job framework rails cron

shared by 張 旭 on 03 Dec 16 - No Cached
  • A background or asynchronous job (or task) is one that is processed outside of the usual request/response workflow that is part of any modern web framework
  • Asynchronous tasks on the other hand, are those that may be started from a normal web request, but require a longer time to complete than the normal request.
crazylion lee

Proxmox VE - 0 views

pve.proxmox.com/Main_Page

virtual vm management

shared by crazylion lee on 04 Dec 16 - No Cached
  • crazylion lee on 04 Dec 16
     
    " Proxmox Virtual Environment is an open source server virtualization management solution based on QEMU/KVM and LXC. You can manage virtual machines, containers, highly available clusters, storage and networks with an integrated, easy-to-use web interface or via CLI. Proxmox VE code is licensed under the GNU Affero General Public License, version 3. The project is developed and maintained by Proxmox Server Solutions GmbH."
crazylion lee

Home - SemiCode OS - 0 views

www.semicodeos.com

linux programmer distribution

shared by crazylion lee on 04 Dec 16 - No Cached
  • crazylion lee on 04 Dec 16
     
    "SemiCode OS - Linux For Programmers and Web Developers"
crazylion lee

Google Web Designer - 0 views

www.google.com/webdesigner

html5 google web designer dreamweaver

shared by crazylion lee on 17 Dec 16 - No Cached
  • crazylion lee on 17 Dec 16
     
    "Create engaging, interactive HTML5-based designs and motion graphics that can run on any device. "
crazylion lee

PouchDB, the JavaScript Database that Syncs! - 0 views

pouchdb.com

javascript pouchDB db

shared by crazylion lee on 08 Dec 16 - No Cached
  • crazylion lee on 08 Dec 16
     
    " PouchDB is an open-source JavaScript database inspired by Apache CouchDB that is designed to run well within the browser. PouchDB was created to help web developers build applications that work as well offline as they do online. It enables applications to store data locally while offline, then synchronize it with CouchDB and compatible servers when the application is back online, keeping the user's data in sync no matter where they next login."
crazylion lee

Sauce Labs: Selenium Testing, Mobile Testing, JS Unit Testing - 0 views

saucelabs.com

testing browser selenium

shared by crazylion lee on 01 Jun 16 - No Cached
  • crazylion lee on 01 Jun 16
     
    "LESS TIME TESTING. MORE TIME INNOVATING. Accelerate your software development process using the world's largest automated testing cloud for web and mobile applications FREE TRIAL "
crazylion lee

dbpatterns - create, share, explore database patterns - 0 views

dbpatterns.com

database patterns db Design

shared by crazylion lee on 08 Jun 16 - No Cached
  • crazylion lee on 08 Jun 16
     
    "Dbpatterns is a service that allows you to create, share, explore database models on the web."
crazylion lee

Riemann - A network monitoring system - 0 views

riemann.io/index.html

monitoring dashboard sysadmin

shared by crazylion lee on 17 Apr 16 - No Cached
  • crazylion lee on 17 Apr 16
     
    "Riemann aggregates events from your servers and applications with a powerful stream processing language. Send an email for every exception in your app. Track the latency distribution of your web app. See the top processes on any host, by memory and CPU. Combine statistics from every Riak node in your cluster and forward to Graphite. Track user activity from second to second."
crazylion lee

zoofIO/flexx - 0 views

github.com/flexx

gui ui python

shared by crazylion lee on 08 Sep 15 - No Cached
  • crazylion lee on 08 Sep 15
     
    "Python UI tookit based on web technology http://flexx.readthedocs.org"
« First ‹ Previous 41 - 60 of 137 Next › Last »
Showing 20▼ items per page