Add Installation documentation and make update

Added documentation to the makefile and to docs
and an additional update command to the makefile, so configuration
dosn't get overwritten.

refs #4175

Makefile.in

@@ -6,11 +6,18 @@ INSTALL=@INSTALL@
 INSTALL_OPTS=@INSTALL_OPTS@
 INSTALL_OPTS_WEB=@INSTALL_OPTS_WEB@
 
+default:
+	@echo "Icinga2Web make targets: "
+	@echo " -install: \t\t Install the application and overwrite configs"
+	@echo " -update: \t\t Install the application without touching the configs"
+	@echo " -install-apache-config: \t Install the apache configuration"
+
 #
 # Installs the whole application w\o httpd configurations
 #
 install: install-static-files install-runtime-dirs
 
+update: install-application
 #
 # Removes files created by ./configure
 #
@@ -43,7 +50,7 @@ install-tests: copy-folder-tests
 #
 # Install configurations for apache2
 #
-install-apache-configs:
+install-apache-config:
 	$(INSTALL) -m 644 $(INSTALL_OPTS) "./etc/apache/icinga2web.conf"  $(WWW_CONF_PATH)/icinga2web.conf;
 
 #

doc/installation.md

@@ -0,0 +1,46 @@
+
+# Installation
+
+## configure && make
+
+### Basic installation
+
+If you like to configurea and install icinga2-web from the command line or 
+if you want to create packages, configure and make is the best choice for installation.
+
+
+`
+./configure && make install && make install-apache2-config
+`
+will install the application to the default target (/usr/local/icinga2-web). Also 
+an apache configuration entry is added to your apache server, so you should restart
+your web server according to your systems configuration.
+
+### Installation directory
+
+If you want to install the application to a different directory, use the --prefix flag in your 
+configure call:
+`
+./configure --prefix=/my/target/directory
+` 
+
+### Authentication
+
+By default, icinga2-web will be installed to authenticate againts its internal database,
+but you can configure it to use ldap-authentication by adding the `--with-ldap-authentication` 
+flag. You must provide the authentication details for your ldap server by using the --with-ldap-* flags.
+To see a full list of the flags, call `./configure --help`
+
+### Icinga backend
+
+The default option for icinga2web is to configure all icinga backends with the default settings (for example
+/usr/local/icinga/ as the icinga directory) but only enable statusdat. To use a different backend,
+call `--with-icinga-backend=` and provide ido, livestatus or statusdat as an option. To further configure
+your backend, take a look at the various options described in `./configure --help` 
+
+
+
+Quick and Dirty
+----------------
+
+tdb.