jonny » Red Branch

Nginx Reverse Proxy

January 14, 2015 jonny apache

Using CentOS 6 I installed Nginx with:

yum install nginx

1	yum install nginx

and amended the config file for the default website i.e.

vi /etc/nginx/conf.d/default.conf

1	vi /etc/nginx/conf.d/default.conf

With the following content:

upstream backend_st {
server st.domain.co.uk:80;
}
server {
listen       123.123.123.123:8080;
server_name  frontend.domain.co.uk;
include /etc/nginx/default.d/*.conf;
access_log /var/log/nginx/log/lamp.eeecs.qub.ac.uk.access.log  main;
error_log  /var/log/nginx/log/lamp.eeecs.qub.ac.uk.error.log;
root   /usr/share/nginx/html;
index  index.html index.htm;
location / {
proxy_pass  http://backend_st;
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
proxy_redirect off;
proxy_buffering off;
proxy_set_header        host           "st.domain.co.uk:80";
proxy_set_header        x-real-ip       $remote_addr;
proxy_set_header        x-forwarded-for $proxy_add_x_forwarded_for;
}
}

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upstream backend_st {

server st.domain.co.uk:80;

}

server {

listen 123.123.123.123:8080;

server_name frontend.domain.co.uk;

include /etc/nginx/default.d/*.conf;

access_log /var/log/nginx/log/lamp.eeecs.qub.ac.uk.access.log main;

error_log /var/log/nginx/log/lamp.eeecs.qub.ac.uk.error.log;

root /usr/share/nginx/html;

index index.html index.htm;

location / {

proxy_pass http://backend_st;

proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;

proxy_redirect off;

proxy_buffering off;

proxy_set_header host "st.domain.co.uk:80";

proxy_set_header x-real-ip $remote_addr;

proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;

}

So visiting the web address frontend.domain.co.uk:8080 as configured under the ‘server’ section will proxy the website from st.domain.co.uk:80 Advice on the web specified using $host or configuring the proxy_set_header:

proxy_set_header        Host            $host;

1	proxy_set_header Host $host;

However,… Read more »

Selectively Checking Disk Usage Excluding Files and Folders

January 13, 2015 jonny linux, shell

Normally to check the disk usage of directories on a linux system I would run:

du -sh *

1

du -sh *

However, occasionally I want to exclude particular directories that take a long time to check and/or that I am not interested in anyway. The example below run from the root of the filesystem skips checks for /home /local /var… Read more »

Fido U2F Security Key

January 7, 2015 jonny linux

So I ordered a FIDO U2F Security Key from a French company ‘Plug-Up’ to have a little play. It is used in 2-factor authentication so when logging in to a service you first enter your username and password and if correct your are prompted for your second factor (a code sent by SMS or a… Read more »

Environment Modules

December 3, 2014 jonny foss, Gnu Free Software

Environment Modules allow for management of environment variables when using multiple compilers, multiple libraries, or even versions of applications that you might need to run. Rather than change $PATH, $LD_LIBRARY_LOAD, or $MANPATH for each you can use Environment Modules to handle the path changes to ensure you run the appropriate version correctly. Installation On CentOS… Read more »

Saving Streaming Video with VLC

December 2, 2014 jonny open source

I was asked by a relative if a live video stream could be saved for later viewing. I found the (m3u8) address for the live video stream by right-clicking the link on the website and used this in VLC. VLC is freedom software available from the VLC website. From the VLC menu bar I chose… Read more »

Server Technology Sentry Switched CDU

December 1, 2014 jonny network

A few notes for future reference. I am playing with a power distribution unit from Server Technology – Model CW-16VE-P32M Initially to configure the device I plugged both the Cabinet Distribution Unit (CDU) unit and a laptop into a switch, setting the IP address to the same subnet as the unit. I set the laptop… Read more »

Favicon Generator

November 28, 2014 jonny web design

Note to Self: The service at http://realfavicongenerator.net is great for generating favicon’s and icons for other mobile platforms.

Deploying a Web Project from Gitlab

November 27, 2014 jonny php

I wanted to automatically deploy a web project when any updates are pushed to the gitlab repository. To do so I added a ‘Web Hook’. The Web Hook calls a URL in response to ‘push’ events. I created a PHP page to be called by the Web Hook: So in response to push events gitlab_hook.php… Read more »

Huge Pages in CentOS 6

November 24, 2014 jonny red hat centos

To check the size and amount of Huge Pages use:

grep -i Hugepage /proc/meminfo

1	grep -i Hugepage /proc/meminfo

This should so something like:

HugePages_Total:    0
HugePages_Free:     0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB

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HugePages_Total: 0

HugePages_Free: 0

HugePages_Rsvd: 0

HugePages_Surp: 0

Hugepagesize: 2048 kB

To change the number of HugePages use the following:

sysctl -w vm.nr_hugepages=2560

1	sysctl -w vm.nr_hugepages=2560

This would allocate 2560x2048kB = 5GB

grep -i Hugepage /proc/meminfo

1	grep -i Hugepage /proc/meminfo

AnonHugePages:     10240 kB
HugePages_Total:    2560
HugePages_Free:     2560
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB

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AnonHugePages: 10240 kB

HugePages_Total: 2560

HugePages_Free: 2560

HugePages_Rsvd: 0

HugePages_Surp: 0

Hugepagesize: 2048 kB

To check the impact on memory:

grep -i memfree /proc/meminfo

1	grep -i memfree /proc/meminfo

Reset Huge Pages The change can be applied permanently in /etc/sysctl.conf but to… Read more »

Filezilla is Dead – Killed by Malware

November 24, 2014 jonny foss, rants

With a heavy heart I can no longer recommend FileZilla.For years I had pointed users to Filezilla for several reasons including availability on multiple platforms and support for FTPS. I have now been informed that Windows users who download FileZilla via Sourceforge are getting an installer that tries to install crapware. Filezilla are aware of… Read more »

Posts By: jonny