Checking Varnish configuration syntax

If you have updated your Varnish configuration and want to check it,
run this command:

varnishd -C -f /etc/varnish/default.vcl

if everything is correct, Varnish will dump out the genrated configuration, otherwise you will get an error message pointing you to a specific line number.

Benchmarking LAN Network Connectivity in Linux

Using netcat:

on destination machine run this command:
(This tells netcat to open port 20000 and listen for connections.)

nc -l 20000 > /dev/null


on source machine execute this command:
(This command will transfer 30MB of data over the network (a blocksize of 1MB, and 30 blocks, is 30MB)


dd if=/dev/zero bs=1M count=30 | nc HERE.COMES.DEST.IP 20000



Once all data is transferred, you’ll get the output from the dd command, showing throughput:


30+0 records in
30+0 records out
31457280 bytes (31 MB) copied, 5.40742 s, 5.8 MB/s




source: http://techthrob.com/2014/01/benchmarking-lan-network-connectivity-in-linux/

TYPO3 extension manger won't work in XAMPP under Windows

Add these lines to all three apache configuration files (http.conf, http-ssl.conf,http-xampp.conf):


<IfModule mpm_winnt_module>
 ThreadStackSize 8388608
</IfModule>


then restart the apache.

Getting HTTP HEAD from command line

Install libwww-perl (Debian) / perl-libwww-perl (CentOS):

Debian: apt-get install  libwww-perl

CentOS: yum install perl-libwww-perl

Run this command:

GET -Used http://YOUR-WEBSITE.COM/

MySQL Database Benchmark

Installing sysbench:

apt-get install sysbench


Preparing the Test Database:

sysbench --test=oltp --oltp-table-size=1000000 --db-driver=mysql --mysql-db=test --mysql-user=ADMIN-USER --mysql-password=ADMIN-PASSWORD prepare

Running Test:
sysbench --test=oltp --oltp-table-size=1000000 --db-driver=mysql --mysql-db=test --mysql-user=ADMIN-USER --mysql-password=ADMIN-PASSWORD prepare

Cleaning test Databse:
sysbench --test=oltp --mysql-db=test --mysql-user=ADMIN-USER --mysql-password= ADMIN-PASSWORDcleanup