Schlagwort-Archive: redirect


as a friend from a provider in berlin gave me the access to a vhost he had, i received another donation from him. a vhost instances with some more ram, as i had on the machine since now was now in the park.

so i had three machines to build my cloud further. since 2010 i was working with big-data tools and the hadoop-framework, a distributed file-system was the main aspect to build such thing. with the new server, i was able to raise the replication from 1 to 2. that was not the replication-factor of 3, which could be seen as minimum for hot-fail-over redundancy systems, but on the right way.

i introduced the machine to the cluster and configured the redirect-proxy the same way, as the machine in jena. after some tests, i had failures with „to many open files“ and i noticed, that the vhost-guest-system was heated to much with the hdfs, so i configured them further.

beside the cluster, i was able to use them as streaming-server for the radio as well, as i switched on, with two channels as well. that was nice, to have capacity in bandwith that way and the scale was nearly linear to the count of machines.

now i was able to play harder with the layer between the tomcat-servlet and the byte-stream, given by the filesystem. the new machine had 4 gigabytes of ram and i gained the headroom for the caching on tomcat much higher then possible before.



as i have the rootServer, i can try and play niceley with my own coded stuff in java, running on tomcat. as the default-webserver just having the php stuff on it, i was looking for my own machine ( or at least for the chance to deploy my stuff ) since a long time.

with no big experience in the hosting field, iam not sure to put the tomcat naked onto the web, so i decide to hide the service behind a proxy/router. after i looked into the given examples, apache could be used therefore. thats to easy, i thought and i remembered some lighthttpd from my school, that one professor took for his page.

configuring the ports and the reverse-proxy was done quite quick, but having more then one subdomain means more then a single config-file. another thing is, that i want to play with load-balancing, so the config was done in three parts.  as example, the workflow of a domain like

part 1: to localhost:80. the gateway with round-robbin load-balancing on a virtual host (server-0) in berlin and redirect to the server-1 in jena.

part 2:

redirect from port 80 on server-0 to server-1 port 80, where another lighty was running.

part 3:

redirect from port 80 to port 8080, where tomcat was running and targeting the servlet-path like http://server1:8080/reporteer/

caching on each layer for different filesizes and different file-types was done that way. as the commong filesize on the http level is mostly below 64 kilobyte ( to measure ) i passed files from the servlet between 64kb and 1mb as java-cache, smaller files on the lighty-instances, separated for images and js/css.  so, some css and some javascript ( lets say up to 8 ) per request was reasonable. a unbounded amount of images where handled by the servlet, beside tiny pictures, like thumbnails and icons.

so i felt a bit save for my tomcat, that exploits or my shity code wont run into a desaster for external incomming requests on port 80.  „the evil hacker“, who wanted to get inside the machine would have to overcome the multiple redirect-layers on the plain/vanilla web-server, to catch the tomcat. beside the fact, that i didnt used any php/cgi nor sql-engine, the chance to fail to quick was not my point anymore.

but the main aspect is, that i can run active code now on the machine. before that, i just made passive / xml based stuff with gwt to run on the vhost i had. now remote-procedure-calls ( rpc ) are possible, beside general httpRequest.