Apache, by default, will serve files to the users as fast as the bandwidth or TCP/IP allows. In an environment where you are hosting files for download, and you …
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HTTP/2 is a significant improvement over HTTP/1.1, especially in the speed department. Apache supports HTTP/2 though it's disabled by default.

You can enable HTTP/2 for …
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HSTS or HTTP Strict Transport Security provides an extra layer of security for HTTPS (SSL / TLS) traffic by preventing HTTPS connections from being downgraded to HTTP, which is …
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Apache webserver reads its configuration files every time it's started. The configuration files are in plain text format, and Apache will need to restart every time there are changes …
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DocumentRoot defines the folder for which the content of your website is located in the server. You can set the value in the main configuration for the default website …
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httpd.conf is Apache‘s main configuration file by default. It will then call out other files and directories via Include and IncludeOptional directives which is meant to simplify the main configuration file, and the structure wildly varies between platforms.

httpd.conf itself is located differently between platforms. These are some of the known locations;

If your platform of choice is not on the list, simply run httpd -V from the terminal and look for SERVER_CONFIG_FILE.

# httpd -V
Server version: Apache/2.4.25 (Unix)
Server built:   Feb  6 2017 20:02:10
Server's Module Magic Number: 20120211:67
Server loaded:  APR 1.5.2, APR-UTIL 1.5.4
Compiled using: APR 1.5.2, APR-UTIL 1.5.4
Architecture:   64-bit
Server MPM:     prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_FLOCK_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/usr"
 -D SUEXEC_BIN="/usr/bin/suexec"
 -D DEFAULT_PIDLOG="/private/var/run/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="/private/etc/apache2/mime.types"
 -D SERVER_CONFIG_FILE="/private/etc/apache2/httpd.conf"

# httpd -V | grep SERVER_CONFIG_FILE
 -D SERVER_CONFIG_FILE="/private/etc/apache2/httpd.conf"

Apache‘s reverse proxy is an act of an Apache webserver providing content from other webserver transparently. This is useful in many instances such as caching and mirroring, but it’s mostly used to serve websites that are hosted behind NAT or a firewall. A reverse proxy server routes connection addressed to the internal server, and the client sees the reverse proxy server itself as the origin server.

For example, Apache can be configured to serve URL‘s such as http://www.example.com/webapp to actually get the content from http://192.168.0.10/myapp, which is hosted from an internal network. This happens transparently and the user initially requesting http://www.example.com/webapp need not to be aware of what happens in the background.

tar.bz2 is normally the default extension for bzip2-compressed tar archive. bzip2 compression produces smaller files but requires higher CPU power to compress and extract compared to most other compression algorithms.

You can extract tar.bz2 files using tar command which is included by default in all major Linux distribtions.;

The following example will extract the file to your current directory;

tar xf /path/to/filename.tar.bz2

To extract the file to other directory, use the -C option as the following;

tar xjf /path/to/filename.tar.bz2 -C /path/to/target

Beginning version 7 of vim, it has this nice auto completion feature. It is by default however limited to words that has already been in the current workspace. To use it, simply press [ctrl] +n or [ctrl] + p key while in edit mode. For example:

We can however *teach* vim to autocomplete a whole bunch of other stuffs as well, by using something so called Dictionaries. With this idea we can have auto completion for Python, Ruby, PHP, Bash, and any other programming languages code.

For an example, let’s try to install Python dictionary, by downloading it from here:

http://www.vim.org/scripts/script.php?script_id=850

The next thing to do is to extract the downloaded file to the appropriate folder:

shakir@herugrim ~ $ mkdir ~/.vim
shakir@herugrim ~ $ tar xf pydiction-0.5.tar.gz -C ~/.vim

and add this lines to your ~/.vimrc (be sure to replace “/home/shakir” to your own home directory)

if has("autocmd")
    autocmd FileType python set complete+=k/home/shakir/.vim/pydiction-0.5/pydiction isk+=.,(
endif " has("autocmd"

and let’s see the result:

There are many other scripts available at Vim’s script page worth trying as well.

You can easily create an SSH key pair by using ssh-keygen as in the following example.

$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/home/user/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/user/.ssh/id_rsa.
Your public key has been saved in /home/user/.ssh/id_rsa.pub.
The key fingerprint is:
1a:6c:a4:94:df:e0:19:ec:85:b0:3f:27:e4:a1:de:65 user@host
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|   .             |
|    o E          |
|     O o         |
|    c @ S        |
|   o A @         |
|    . E .        |
|   . =           |
|    .            |
+-----------------+

There are a few things that you might want need to take note;

1. A 2048 bit RSA key pair will be generated by default. You can use different key type by using -t option and specify any of the supported key types

   dsa ecdsa ed25519 rsa rsa1

2. The private key will be stored in ~/.ssh/id_rsa while the public key will be stored in ~/.ssh/id_rsa.pub. You can specify other location when prompted during the key generation process if you already have a key pair at the default location
3. You can specify passphrase for your key pair when prompted but you’ll have to not set the passphrase to use passwordless SSH login

   How to configure passwordless SSH login

   How to add or remove passphrase on SSH key