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Slow DNS on Linux fix (ipv6/ipv4 conflict)

http://aarvik.dk/disable-ipv6

Slow DNS on Linux fix (ipv6/ipv4 conflict). If your Linux machine is slow resolving DNS via cURL, wget or a similar URL transfer util, it may be because of conflicting ipv4/ipv6 resolving. You can test this by using only ipv4 with cURL:. Curl -4 aarvik.dk. If this curl request is fast as it should be, but it is not with the -4 flag, this may be your problem aswell. In my case it took up to 6 seconds without ipv4 only flag. Other methods for deeper debug. You can also test with tcpdump in the background:.

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Varnish (3) Cache in general and simple static files configuration

http://aarvik.dk/varnish-cache-in-general-and-simple-static-files-configuration

Varnish (3) Cache in general and simple static files configuration. Varnish is an amazing reverse proxy to accelerate your website, and to reduce the pressure on your server. Take a look at Varnish official website for more information:. Https:/ www.varnish-cache.org/. The repository should be available allready, so just run apt-get install:. Sudo apt-get install varnish. 1) Client makes a request to Varnish, and lookup the cached object in it's cache. Varnish found the object with success (HIT). 4) The ...

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How to find growing files on Linux

http://aarvik.dk/how-to-find-growing-files-on-linux

How to find growing files on Linux. This may become handy, if you are logged in to a machine, which you do not know much about, but where you can see that the disk space is running out. I think this scenario is pretty common - i have seen it simply with logs, but also with applications bugging and producing tons of data. Create a temporary file, and use the. Command to find newer files than that file. Create an empty file:. Touch newer than this file. Command on the files found:. Then it calls lsof again...

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How to monitor progress of UNIX utilities (cp, mv, rm, etc.)

http://aarvik.dk/how-to-see-progress-of-unix-utilities-cp-mv-rm-etc-in-usage

How to monitor progress of UNIX utilities (cp, mv, rm, etc.). Cv - Coreutils Viewer. With cv you can monitor what coreutils you got running on your machine, and display what state they are in. This is especially nice to have if you are processing a lot of data, and need some kind of time estimate. Go ahead and download the zip from Github ( https:/ github.com/Xfennec/cv. Curl -OL https:/ github.com/Xfennec/cv/archive/master.zip. Change dir into cv:. Now you are ready to install it from source with make.

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How to create a SOCKS proxy server through SSH

http://aarvik.dk/how-to-create-socks-proxy-through-ssh

How to create a SOCKS proxy server through SSH. Socket Secure (SOCKS) is an Internet protocol that routes network packets between a client and server through a proxy server. SOCKS5 additionally provides authentication so only authorized users may access a server. Practically, a SOCKS server proxies TCP connections to an arbitrary IP address, and provides a means for UDP packets to be forwarded. Start SOCKS proxy server through a target server:. Ssh -D 1080 user@target-server. Use SOCKS proxy through SSH:.

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GHOST vulnerability check one-liner, with most reliable and cross-distro check script(.c).

http://aarvik.dk/ghost-vulnerability-check-one-liner-with-most-reliable-and-cross-distro-check-script-c

GHOST vulnerability check one-liner, with most reliable and cross-distro check script(.c). Https:/ gist.github.com/adionditsak/975764eba35273856be1. Curl -kL https:/ gist.githubusercontent.com/adionditsak/975764eba35273856be1/raw/2f9b31e39c22c03d6ef2152f8128165ef7c1aa27/check ghost.sh bash. An one-liner for the reliable .c Linux cross-distro check script. Then you do not have to think about the manual compiling and deletion of files. Gives you a great overview of vulnerability across machines:. Proudly p...

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Simple script to pinpoint what site is causing high activity on Apache

http://aarvik.dk/simple-way-to-pinpoint-what-site-is-causing-high-load-on-apache

Simple script to pinpoint what site is causing high activity on Apache. This is a script to pinpoint what site is causing high activity on a server by reading appended lines to logs the last 10 seconds and differ. For this to work your VirtualHosts need to specify log location for every site, like the following standard:. Website.tld VirtualHost *:80 . ErrorLog /var/log/httpd/website1.tld error log CustomLog /var/log/httpd/website1.tld access log common . /VirtualHost. Comments powered by Disqus.

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Juniper SRX CLI cheatsheet

http://aarvik.dk/juniper-srx-cli-cheatsheet

Juniper SRX CLI cheatsheet. Learning Juniper SRX at the moment. This cheatsheet was a part of my learning. Https:/ www.juniper.net/us/en/products-services/security/srx-series/. Show configuration display set. Show configuration display set match [customer ip etc]. Set interfaces [interface] unit [vlan] description "[Interface or customer name]". Set interfaces [interface] unit [vlan] vlan-id [vlan-id]. Set interfaces [interface] unit [vlan] family inet address [Range with gateway]. Set security policies ...

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How to install PHP (5.5.15) from source (...and use it with Plesk 12)

http://aarvik.dk/how-to-install-php-5-5-15-from-source-and-use-it-with-plesk

How to install PHP (5.5.15) from source (.and use it with Plesk 12). This will work both for CentOS, Debian, and Ubuntu. Just use a different package manger depending on distro. Find your mirror ( http:/ php.net/downloads.php. And download the latest PHP verison eg. 5.5.15 for me. I save to a tarball called php.tar.gz:. Curl -L http:/ dk1.php.net/get/php-5.5.15.tar.gz/from/this/mirror -o php.tar.gz. Tar -xzvf php.tar.gz. Change directory to the directory with the PHP source:. Cd php-5.5.15/. Apt-get inst...