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lordelph's ramblings stuff and nonsense about software development and whatever else i find fun… menu skip to content home about downloads stampver – win32 version resource stamping lordelph’s lovely icons geohash php class cleanex google reader rss widget urlmenu toys dynamic configuration of doctrine and other services in symfony in this post, i illustrate how symfony’s expression languange can be used to dynamically configure services at runtime, and also show how to replace the doctrine bundle’s connectionfactory to provide very robust discovery of a database at runtime. traditionally, symfony applications are configured through an environment . you can have different environments for development, staging, production – however many you need. but traditionally, these environments are assumed to be static. your database server is here , your memcache cluster is there . if you’ve bought into the 12 factor app mindset, you’ll want to discover those things at runtime through a service like etcd , zookeeper or consul . the problem is, the symfony dependency injection container gets compiled at runtime with a read-only configuration. you could fight the framework and dumped the cached container to trigger a recompilation with new parameters. that’s the nuclear option, and thankfully there are better ways. use the symfony expression language since symfony 2.4 , the expression language provides the means to configure services with expressions. it can do a lot more besides that – see the cookbook for examples – but i’ll focus on how it can be used for runtime configuration discovery. service.yml for a dynamic service as an example, here’s how we might configure a standard memcachedsessionhandler at runtime. the arguments to the session.handler.memcache service are an expression which will call the getmemcache() method in our myapp.dynamic.configuration service at runtime… services: #set up a memcache handler service with an expression... session.handler.memcache: class: symfony\component\httpfoundation\session\storage\handler\memcachedsessionhandler arguments: ["@=service('myapp.dynamic.configuration').getmemcached()"] #this service provides the configuration at runtime myapp.dynamic.configuration: class: myapp\mybundle\service\dynamicconfigurationservice arguments: [%discovery_service_endpoint%, %kernel.cache_dir%] your dynamicconfigurationservice can be configured with whatever it needs, like where to find a discovery service, and perhaps where it can cache that information. all you really need to focus on now is making that getmemcached() as fast as possible! class dynamicconfigurationservice { public function __construct($discoveryurl, $cachedir) { } public function getmemcached() { $m = new memcached(); $m->setoption(memcached::opt_distribution, memcached::distribution_consistent); //discover available servers from cache or discovery service like //zookeeper, etcd, consul etc... //$m->addserver('10.0.0.1', 11211); return $m; } } in a production environment, you’ll probably want to cache the discovered configuration with a short ttl. it depends how fast your discovery service is and how rapidly you want to respond to changes. dynamic doctrine connection using expressions helps you configure services with ‘discovered’ parameters. sometimes though, you want to be sure they are still valid and take remedial action if not. a good example is a database connection. let’s say you store the location of a database in etcd , and the location of the database changes. if you’re just caching the last-known location for a few minutes, you’ve got to wait for that to time out before your app starts working again. that’s because you’re not doing any checking of the values after you read them. in the case of a database, you could try making a connection in something like the ` dynamicconfigurationservice` example above. but we don’t expect the database to change often – it might happen one-in-a-million requests. why burden the application with unnecessary checks? in the case of doctrine, what you can do is provide your own derivation of the connectionfactory from the doctrine bundle. we’ll override the createconnection to obtain our configuration, call the parent, and retry a few times if the parent throws an exception…. class mydoctrineconnectionfactory extends \doctrine\bundle\doctrinebundle\connectionfactory { protected discoverdatabaseparams($params) { // discover parameters from cache // or // discover parameters from discovery service // cache them with a short ttl } protected clearcache($params) { // destroy any cached parameters } public function createconnection( array $params, configuration $config = null, eventmanager $eventmanager = null, array $mappingtypes = array()) { //try and create a connection $tries = 0; while (true) { //so we give it a whirl... try { $realparams=$this->discoverdatabaseparams($params); return parent::createconnection($realparams, $config, $eventmanager, $mappingtypes); } catch (\exception $e) { //forget our cache - it's broken, and let's retry a few times $this->clearcache($params); $tries++; if ($tries > 5) { throw $e; } else { sleep(1); } } } } } to make the doctrine bundle use our connection factory, we must set the doctrine.dbal.connection_factory.class parameter to point at our class… parameters: doctrine.dbal.connection_factory.class: mycompany\mybundle\service\mydoctrineconnectionfactory so we’re not adding much overhead – we pull in our cached configuration, try to connect, and if it fails we’ll flush our cache and try again. you can add a short sleep between retry attempts, depending on what your database failover characteristics are. know any other tricks? if you’ve found this post because you’re solving similar problems, let me know and i’ll add links into this post. this entry was posted in software development , symfony on february 13, 2015 by paul dixon . blue-turquoise-green deployment in this post i’m putting a name to something i’ve found myself doing in order to deliver zero-downtime deployments without any loss of database consistency. the idea of blue-green deployment is well-established and appealing. bring up an entire new stack when you want to deploy, and when you’re ready, flip over to it at the load balancer. zero downtime deployment. it makes everyone happy. but…data synchronization is hard cloud environments make it easy to bring up a new stack for blue-green deployments. what’s not so easy is dealing with transactions during the flip from blue to green. during that time, some of your blue services might be writing data into the blue database, and on a subsequent request, trying to read it out of green. you either have to live with a little inconsistency, or drive yourself crazy trying to get it synchronized. what about a common database? this won’t suit all applications, but you can do blue-green deployment with a common data storage backend. the actual blue and green elements of the stack consist of application code and any data migration upgrade/downgrade handling logic. most of the time, if you’re trying to push out frequent updates, those updates are software changes with infrequent database schema changes. so, you can happily make several releases a day with zero downtime. however, sooner or later you’re going to make a breaking schema change. the horror of backwards incompatible schema changes so, you’re barrelling along with your shared data backend, and you find the current live blue deployment will fail when the new green deployment performs its database migrations on your common data store. now you can’t deploy green without a scheduled downtime. but you don’t want scheduled downtime! how can we do a zero downtime deployment and still retain the green-blue rollback capability? introducing blue-turquoise-green deployment! you need to create a turquoise stack. that’s the blue release, patched to run without failure on both a blue and a green database schema. this means it might ha

URL analysis for elphin.com

http://blog.dixo.net/category/life-hacks/
http://blog.dixo.net/wp-content/uploads/2015/02/turquoise1.png
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http://blog.dixo.net/2015/02/dynamic-configuration-of-doctrine-and-other-services-in-symfony/
http://blog.dixo.net/category/web-design/
http://blog.dixo.net/category/machine-learning/
http://blog.dixo.net/downloads/cleanex/
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http://blog.dixo.net/#content

Whois Information

Whois is a protocol that is access to registering information. You can reach when the website was registered, when it will be expire, what is contact details of the site with the following informations. In a nutshell, it includes these informations;

Domain Name: ELPHIN.COM
Registry Domain ID: 2129801_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.tucows.com
Registrar URL: http://www.tucowsdomains.com
Updated Date: 2017-07-24T07:15:17Z
Creation Date: 1998-07-27T04:00:00Z
Registry Expiry Date: 2018-07-26T04:00:00Z
Registrar: Tucows Domains Inc.
Registrar IANA ID: 69
Registrar Abuse Contact Email:
Registrar Abuse Contact Phone:
Domain Status: ok https://icann.org/epp#ok
Name Server: NS1.POSITIVE-INTERNET.COM
Name Server: NS5.POSITIVE-INTERNET.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2018-06-25T13:29:10Z <<<

For more information on Whois status codes, please visit https://icann.org/epp

NOTICE: The expiration date displayed in this record is the date the
registrar's sponsorship of the domain name registration in the registry is
currently set to expire. This date does not necessarily reflect the expiration
date of the domain name registrant's agreement with the sponsoring
registrar. Users may consult the sponsoring registrar's Whois database to
view the registrar's reported date of expiration for this registration.

TERMS OF USE: You are not authorized to access or query our Whois
database through the use of electronic processes that are high-volume and
automated except as reasonably necessary to register domain names or
modify existing registrations; the Data in VeriSign Global Registry
Services' ("VeriSign") Whois database is provided by VeriSign for
information purposes only, and to assist persons in obtaining information
about or related to a domain name registration record. VeriSign does not
guarantee its accuracy. By submitting a Whois query, you agree to abide
by the following terms of use: You agree that you may use this Data only
for lawful purposes and that under no circumstances will you use this Data
to: (1) allow, enable, or otherwise support the transmission of mass
unsolicited, commercial advertising or solicitations via e-mail, telephone,
or facsimile; or (2) enable high volume, automated, electronic processes
that apply to VeriSign (or its computer systems). The compilation,
repackaging, dissemination or other use of this Data is expressly
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use electronic processes that are automated and high-volume to access or
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reserves the right to modify these terms at any time.

The Registry database contains ONLY .COM, .NET, .EDU domains and
Registrars.

  REGISTRAR Tucows Domains Inc.

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =elphin.com

  PORT 43

  TYPE domain

DOMAIN

  NAME elphin.com

  CHANGED 2017-07-24

  CREATED 1998-07-27

STATUS
ok https://icann.org/epp#ok

NSERVER

  NS1.POSITIVE-INTERNET.COM 80.87.136.65

  NS5.POSITIVE-INTERNET.COM 80.87.128.70

  REGISTERED yes

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