From b9a87c04c8b1cb8bc910888e4aa41d1cb5ac2b49 Mon Sep 17 00:00:00 2001
From: Jan Kaluza <jkaluza@redhat.com>
Date: Tue, 1 Dec 2015 18:51:06 +0100
Subject: [PATCH] documentation update

---
 _includes/themes/twitter/my.html           |   4 +-
 _includes/themes/twitter/myconfig.html     |   4 +-
 css/style_config.css                       |   2 +-
 documentation/about.md                     |  64 ++----
 documentation/configuration/config_file.md | 179 +----------------
 documentation/frontends/frontends.md       |  31 +++
 documentation/frontends/xmpp.md            | 222 +++++++++++++++++++++
 documentation/index.md                     |  14 +-
 documentation/installation/docker.md       |  53 +++++
 download/index.md                          |   9 +-
 index.md                                   |   4 +-
 11 files changed, 353 insertions(+), 233 deletions(-)
 create mode 100644 documentation/frontends/frontends.md
 create mode 100644 documentation/frontends/xmpp.md
 create mode 100644 documentation/installation/docker.md

diff --git a/_includes/themes/twitter/my.html b/_includes/themes/twitter/my.html
index fa0f7854..73623647 100644
--- a/_includes/themes/twitter/my.html
+++ b/_includes/themes/twitter/my.html
@@ -6,7 +6,7 @@
     <meta http-equiv="X-UA-Compatible" content="chrome=1" />
     <meta name="description" content="Spectrum 2 : Spectrum 2 IM transports" />
 
-    <link href="http://spectrum.im/css/style.css" rel="stylesheet" type="text/css" media="all">
+    <link href="/css/style.css" rel="stylesheet" type="text/css" media="all">
 
     <title>Spectrum 2</title>
   </head>
@@ -18,7 +18,7 @@
         <header class="inner">
           <a id="forkme_banner" href="https://github.com/hanzz/spectrum2">View on GitHub</a>
 
-<img id="logo" src="http://spectrum.im/logo.png" style="width:250px; margin-left: auto;margin-right: auto; display:block;"/>
+<img id="logo" src="/logo.png" style="width:250px; margin-left: auto;margin-right: auto; display:block;"/>
 
             <section id="menu" style="text-align: center;">
             <a class="menuitem" href="http://spectrum.im">About</a>
diff --git a/_includes/themes/twitter/myconfig.html b/_includes/themes/twitter/myconfig.html
index 5b28c957..cad7bbcb 100644
--- a/_includes/themes/twitter/myconfig.html
+++ b/_includes/themes/twitter/myconfig.html
@@ -6,7 +6,7 @@
     <meta http-equiv="X-UA-Compatible" content="chrome=1" />
     <meta name="description" content="Spectrum 2 : Spectrum 2 IM transports" />
 
-    <link href="http://spectrum.im/css/style_config.css" rel="stylesheet" type="text/css" media="all">
+    <link href="/css/style_config.css" rel="stylesheet" type="text/css" media="all">
 
     <title>Spectrum 2</title>
   </head>
@@ -18,7 +18,7 @@
         <header class="inner2">
           <a id="forkme_banner" href="https://github.com/hanzz/spectrum2">View on GitHub</a>
 
-<img id="logo" src="http://spectrum.im/logo.png" style="width:250px; margin-left: auto;margin-right: auto; display:block;"/>
+<img id="logo" src="/logo.png" style="width:250px; margin-left: auto;margin-right: auto; display:block;"/>
 
             <section id="menu" style="text-align: center;">
             <a class="menuitem" href="http://spectrum.im">About</a>
diff --git a/css/style_config.css b/css/style_config.css
index 9004b64d..c5583133 100644
--- a/css/style_config.css
+++ b/css/style_config.css
@@ -335,7 +335,7 @@ Full-Width Styles
 
 .inner2 {
   position: relative;
-  max-width: 640px;
+  max-width: 880px;
   padding: 20px 10px;
   margin: 0 auto;
 }
diff --git a/documentation/about.md b/documentation/about.md
index 627014a3..c87bd3e5 100644
--- a/documentation/about.md
+++ b/documentation/about.md
@@ -3,60 +3,34 @@ layout: page
 title: Spectrum 2
 ---
 
-## Gateway mode and server mode
+![Spectrum 2 animation](/animation.gif)
 
-Spectrum 2 can work in two modes: Gateway mode and Server mode. This chapter describes differences betweeen those two modes. If you want to find out how to configure Spectrum 2 to run in gateway or server mode, read the Configuration part of this documentation.
+Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks. It acts as a transport layer between the users as showed in the animation above.
 
-### Gateway mode
 
-Gateway mode represents the classic way how XMPP gateway works. You have to configure an external XMPP server (like Prosody or Ejabberd) to serve the subdomain you want to use for Spectrum 2 (for example "icq.domain.tld"). Spectrum 2 in gateway mode then connects the XMPP server as its component and users are able to find out "icq.domain.tld" in Service Discovery, register it and use it.
+## Spectrum 2 frontends and backends
 
-*Advantages:*
-* Users can use more legacy networks using single XMPP account (and using single TCP connection).
-* It's easy to extend existing XMPP servers using gateway mode.
+As it was already written above, Spectrum 2 supports multiple IM networks. Spectrum 2 distinguishes between **Frontend** and **Backend** networks.
 
-*Disadvantages:*
-* Passwords are stored (even in encrypted form) on server.
-* Roster (contact list) synchronization can be problematic, because it depends on the client user uses. This can be improved by usage of Remote Roster protoXEP.
-* You have to setup XMPP server and use database even if you only want to use Spectrum 2 as a tool to connect legacy networks using XMPP protocol.
+If some network is supported as **Frontend**, it means that Spectrum 2 allows its users to use this network to communicate with other users using the **backend** network.
 
-### Server mode
+#### Example
 
-In server mode, Spectrum 2 behaves as standalone server. User then logins legacy networks by logging XMPP account like this one: "my_msn_name%hotmail.com@msn.domain.tld".
+If you for example use **Slack** as a frontend and **IRC** as a backend, the Spectrum 2 users can add Spectrum 2 to their Slack team, join the IRC network and communicate with their friends on IRC network.
 
-*Advantages:*
-* Passwords are not stored on server.
-* Roster synchronization is easy, because Spectrum 2 acts as normal server.
-* If you want to use Spectrum 2 as wrapper between different networks, you don't need database or Jabber server as another layer.
-* Using SRV records you can easily run Spectrum 2 on different machines to scale it.
+## Supported frontends
 
-*Disadvantages:*
+Currently, following frontends are supported:
 
-* Clients have to support more accounts to connect more legacy networks (Therefore they will need have to use more TCP connections).
+* XMPP
+* Slack
 
-## Instance, main process and backends
-
-This chapter describes differences between Spectrum 2 instance, Spectrum 2 main process and Spectrum 2 backends.
-
-### Spectrum 2 instance
-
-In server mode, Spectrum 2 instance is single XMPP server. In gateway mode, it is single XMPP gateway. We can say these statements about Spectrum 2 instance:
-
-* One instance is defined by one configuration file (By default stored in `/etc/spectrum2/transports/`).
-* Spectrum 2 instance is represented to end user by its Jabber ID (for example icq.domain.tld).
-* Internally every Spectrum 2 instance consists of Spectrum 2 main process and Spectrum 2 backends.
-* One instance can run just one type of Spectrum 2 backend.
-
-### Spectrum 2 main process
-
-Spectrum 2 main process is the main process of Spectrum 2 instance.
-
-* Spectrum 2 main process is responsible for running Spectrum 2 backends and routing users' requests to proper backend.
-* By default the logs of Spectrum 2 main process are stored in `/var/log/spectrum2/$jid/spectrum2.log`.
-
-### Spectrum 2 backend
-
-Spectrum 2 backend is special application run by Spectrum 2 main process. The goal of Spectrum 2 backend is to handle users's sessions. Spectrum 2 main process can handle more Spectrum 2 backends, but all messages from single user are always handled by the same backend.
-
-One Spectrum 2 instance can run only one type of Spectrum 2 backend.
+## Supported backends
 
+* IRC
+* Twitter
+* Skype
+* XMPP
+* Facebook
+* MSN
+* Yahoo
diff --git a/documentation/configuration/config_file.md b/documentation/configuration/config_file.md
index 6b9fe22c..7cc1e657 100644
--- a/documentation/configuration/config_file.md
+++ b/documentation/configuration/config_file.md
@@ -4,6 +4,7 @@ title: Spectrum 2
 ---
 
 > **\[database\]**
+>
 > * [database](#databasedatabase)
 > * [password](#databasepassword)
 > * [port](#databaseport)
@@ -12,12 +13,6 @@ title: Spectrum 2
 > * [type](#databasetype)
 > * [user](#databaseuser)
 >
-> **\[identity\]**
->
-> * [category](#identitycategory)
-> * [name](#identityname)
-> * [type](#identitytype)
->
 > **\[logging\]**
 >
 > * [backend_config](#loggingbackend_config)
@@ -25,32 +20,26 @@ title: Spectrum 2
 >
 > **\[registration\]**
 >
-> * [auto_register](#registrationauto_register)
-> * [enable_public_registration](#registrationenable_public_registration)
+> * [auto_register](#registrationautoregister)
+> * [enable_public_registration](#registrationenablepublicregistration)
 > * [instructions](#registrationinstructions)
-> * [username_label](#registrationusername_label)
-> * [username_mask](#registrationusername_mask)
+> * [username_label](#registrationusernamelabel)
+> * [username_mask](#registrationusernamemask)
 >
 > **\[service\]**
 >
-> * [admin_jid](#serviceadmin_jid)
-> * [admin_password](#serviceadmin_password)
-> * [allowed_servers](#serviceallowed_servers)
+> * [admin_jid](#serviceadminjid)
+> * [admin_password](#serviceadminpassword)
 > * [backend](#servicebackend)
-> * [backend_host](#servicebackend_host)
-> * [backend_port](#servicebackend_port)
-> * [cert](#servicecert)
-> * [cert_password](#servicecert_password)
+> * [backend_host](#servicebackendhost)
+> * [backend_port](#servicebackendport)
 > * [group](#servicegroup)
 > * [jid](#servicejid)
 > * [password](#servicepassword)
 > * [pidfile](#servicepidfile)
-> * [port](#serviceport)
-> * [server](#serviceserver)
-> * [server_mode](#serviceserver_mode)
 > * [user](#serviceuser)
-> * [users_per_backend](#servicusers_per_backend)
-> * [working_dir](#serviceworking_dir)
+> * [users_per_backend](#servicusersperbackend)
+> * [working_dir](#serviceworkingdir)
 
 
 
@@ -147,41 +136,6 @@ Default:|empty string
 
 For server-client databases, this option configures username to be used to connect the database.
 
-#### identity.category
-
-Key | val
-----|----
-Description:|Configures disco#info identity category.
-Context:|gateway-mode
-Type:|string
-Default:|gateway
-
-This option configures disco#info identity category.
-
-#### identity.name
-
-Key | val
-----|----
-Description:|Configures the name showed in service discovery.
-Context:|gateway-mode
-Type:|string
-Default:|Spectrum 2 Transport
-
-This option configures the name showed in service discovery.
-
-#### identity.type
-
-Key | val
-----|----
-Description:|Configures type of transport as showed in service discovery.
-Context:|gateway-mode
-Type:|string
-Default:|empty string
-
-This option configures type of transport as showed in service discovery. It is usually used by XMPP client to show proper
-icons according to type of network. See [Disco Categories](http://xmpp.org/registrar/disco-categories.html#gateway) for
-allowed values.
-
 #### logging.config
 
 Key | val
@@ -290,29 +244,6 @@ Default:|empty string
 
 This option configures the password which is used by clients defined in service.admin_jid to use Admin Interface.
 
-#### service.allowed_servers
-
-Key | val
-----|----
-Description:|Configures list of servers from which users can connect and register Spectrum 2 transport.
-Context:|gateway-mode
-Type:|list of JIDs
-Default:|empty list
-
-Configures list of servers from which users can connect and register Spectrum 2 transport. This option is used together with
-registration.enable_public_registration option. If registration.enable_public_registration is set to 0, you can use this option
-as a white-list, to enable users from particular domain to use your Spectrum 2 instance, but disallow it to any other users.
-
-Following part of config file disables public registrations and allows only users from xmpp.org and jabber.org to use this Spectrum 2 instance:
-
-	[service]
-	allowed_servers=xmpp.org
-	allowed_servers=jabber.org
-	
-	[registration]
-	enable_public_registration=0
-
-
 #### service.backend
 
 Key | val
@@ -350,29 +281,6 @@ Default:|0
 This option configures port on which Spectrum 2 listens on for backends connections. If the value of this option is 0, then Spectrum 2
 uses randomly generated port number.
 
-#### service.cert
-
-Key | val
-----|----
-Description:|Configures certificate to be used for SSL encryption in server-mode.
-Context:|server-mode
-Type:|string
-Default:|empty string
-
-This option configures full path to PKCS#12 certificate which is used for SSL in server-mode. To find out, how to create
-such certificate, please read [Using SSL in server mode](http://spectrum.im/documentation/configuration/server_ssl.html).
-
-#### service.cert_password
-
-Key | val
-----|----
-Description:|Configures password for certificate which is used for SSL encryption in server-mode.
-Context:|server-mode
-Type:|string
-Default:|empty string
-
-This option configures password which is used to decrypt PKCS#12 certificate (if it is encrypted). For more information about SSL
-with Spectrum 2, read service.cert option description.
 
 #### service.group
 
@@ -427,71 +335,6 @@ Default:|/var/run/spectrum2/$jid.pid
 This option configures path to file when Spectrum 2 stores its process ID. This file is later used by `spectrum2_manager` to determine,
 if this particular Spectrum 2 instance runs.
 
-#### service.port
-
-Key | val
-----|----
-Description:|Configures port on which Spectrum listens to in server-mode or to which connects in gateway-mode.
-Context:|server-mode and gateway-mode
-Type:|integer
-Default:|0
-
-This option configures port on which Spectrum listens to in server-mode or to which connects in gateway-mode. In server-mode
-the default port for XMPP servers is 5222, so you should use this port. In gateway-mode, you have to at first configure your
-server to allow Spectrum 2 to connect it as its component. On many servers, the default component port is 5347, but this option
-depends on particular XMPP server and its configuration.
-
-#### service.server
-
-Key | val
-----|----
-Description:|Configures hostname or IP address of server to which Spectrum 2 connects to.
-Context:|gateway-mode
-Type:|string
-Default:|empty string
-
-This option configures hostname or IP address of server to which Spectrum 2 connects to. It is used only in gateway-mode and
-you should configure it to point to hostname or IP of your XMPP server.
-
-#### service.server_mode
-
-Key | val
-----|----
-Description:|Configures if Spectrum 2 works in server mode or gateway mode
-Context:|server-mode and gateway-mode
-Type:|boolean
-Default:|0
-
-If this option is true, Spectrum 2 works in server-mode and acts as standalone server.
-
-User then logins legacy networks by logging XMPP account like this one: `my_msn_name%hotmail.com@msn.domain.tld`.
-
-*Advantages:*
-* Passwords are not stored on server.
-* Roster synchronization is easy, because Spectrum 2 acts as normal server.
-* If you want to use Spectrum 2 as wrapper between different networks, you don't need database or Jabber server as another layer.
-* Using SRV records you can easily run Spectrum 2 on different machines to scale it.
-
-*Disadvantages:*
-
-* Clients have to support more accounts to connect more legacy networks (Therefore they will need have to use more TCP connections).
-
-If this option is false, Spectrum 2 acts as normal XMPP component (gateway).
-
-You then have to configure an external XMPP server (like Prosody or Ejabberd) to serve the subdomain you want to use for Spectrum 2 (for example "icq.domain.tld"). Spectrum 2 in gateway mode then connects the XMPP server as its component and users are able to find out "icq.domain.tld" in Service Discovery, register it and use it.
-
-*Advantages:*
-* Users can use more legacy networks using single XMPP account (and using single TCP connection).
-* It's easy to extend existing XMPP servers using gateway mode.
-
-*Disadvantages:*
-* Passwords are stored (even in encrypted form) on server.
-* Roster (contact list) synchronization can be problematic, because it depends on the client user uses. This can be improved by usage of Remote Roster protoXEP.
-* You have to setup XMPP server and use database even if you only want to use Spectrum 2 as a tool to connect legacy networks using XMPP protocol.
-
-
-
-
 #### service.user
 
 Key | val
diff --git a/documentation/frontends/frontends.md b/documentation/frontends/frontends.md
new file mode 100644
index 00000000..1ff16efc
--- /dev/null
+++ b/documentation/frontends/frontends.md
@@ -0,0 +1,31 @@
+---
+layout: page
+title: Spectrum 2
+---
+
+## Spectrum 2 frontends and backends
+
+Spectrum 2 supports multiple IM networks. Spectrum 2 distinguishes between **Frontend** and **Backend** networks.
+
+If some network is supported as **Frontend**, it means that Spectrum 2 allows its users to use this network to communicate with other users using the **backend** network.
+
+#### Example
+
+If you for example use **Slack** as a frontend and **IRC** as a backend, the Spectrum 2 users can add Spectrum 2 to their Slack team, join the IRC network and communicate with their friends on IRC network.
+
+This page contains the list of currently supported frontends with the basic information about them.
+
+### How to change frontends
+
+Frontends are switched in Spectrum 2 config file using the following option:
+
+Section| Option| Value
+-------|-------|------
+service|frontend|Name of the frontend.
+
+### List of frontends
+
+Name| Supported network
+----|-------------------
+`xmpp`| XMPP (Jabber)
+`slack`| Slack
diff --git a/documentation/frontends/xmpp.md b/documentation/frontends/xmpp.md
new file mode 100644
index 00000000..83f43a59
--- /dev/null
+++ b/documentation/frontends/xmpp.md
@@ -0,0 +1,222 @@
+---
+layout: config
+title: Spectrum 2
+---
+
+> **\[identity\]**
+>
+> * [category](#identitycategory)
+> * [name](#identityname)
+> * [type](#identitytype)
+>
+>
+>
+> **\[service\]**
+>
+> * [allowed_servers](#serviceallowedservers)
+> * [cert](#servicecert)
+> * [cert_password](#servicecertpassword)
+> * [port](#serviceport)
+> * [server](#serviceserver)
+> * [server_mode](#serviceservermode)
+
+
+
+## XMPP frontend Description
+
+XMPP frontend allows users to use XMPP as a frontend network for Spectrum 2.
+
+### Configuration
+
+You have to choose this frontend in Spectrum 2 configuration file to use it:
+
+	[service]
+	frontend=xmpp
+
+
+## Gateway mode and server mode
+
+XMPP frontend can work in two modes: Gateway mode and Server mode. This chapter describes differences betweeen these two modes. If you want to find out how to configure Spectrum 2 to run in gateway or server mode, read the Configuration part of this documentation.
+
+### Gateway mode
+
+Gateway mode represents the classic way how XMPP gateway works. You have to configure an external XMPP server (like Prosody or Ejabberd) to serve the subdomain you want to use for Spectrum 2 (for example "icq.domain.tld"). Spectrum 2 in gateway mode then connects the XMPP server as its component and users are able to find out "icq.domain.tld" in Service Discovery, register it and use it.
+
+**Advantages:**
+
+* Users can use more legacy networks using single XMPP account (and using single TCP connection).
+* It's easy to extend existing XMPP servers using gateway mode.
+
+**Disadvantages:**
+
+* Passwords are stored (even in encrypted form) on server.
+* Roster (contact list) synchronization can be problematic, because it depends on the client user uses. This can be improved by usage of Remote Roster protoXEP.
+* You have to setup XMPP server and use database even if you only want to use Spectrum 2 as a tool to connect legacy networks using XMPP protocol.
+
+### Server mode
+
+In server mode, Spectrum 2 behaves as standalone server. User then logins legacy networks by logging XMPP account like this one: "my_msn_name%hotmail.com@msn.domain.tld".
+
+**Advantages:**
+
+* Passwords are not stored on server.
+* Roster synchronization is easy, because Spectrum 2 acts as normal server.
+* If you want to use Spectrum 2 as wrapper between different networks, you don't need database or Jabber server as another layer.
+* Using SRV records you can easily run Spectrum 2 on different machines to scale it.
+
+**Disadvantages:**
+
+* Clients have to support more accounts to connect more legacy networks (Therefore they will need have to use more TCP connections).
+
+## XMPP frontend configuration variables
+
+This chapter contains available configuration variables for XMPP frontend. Note that these are only XMPP frontend specific. For list of general configuration variables, check [Configuration file description](/documentation/configuration/config_file.html).
+
+#### identity.category
+
+Key | val
+----|----
+Description:|Configures disco#info identity category.
+Context:|gateway-mode
+Type:|string
+Default:|gateway
+
+This option configures disco#info identity category.
+
+#### identity.name
+
+Key | val
+----|----
+Description:|Configures the name showed in service discovery.
+Context:|gateway-mode
+Type:|string
+Default:|Spectrum 2 Transport
+
+This option configures the name showed in service discovery.
+
+#### identity.type
+
+Key | val
+----|----
+Description:|Configures type of transport as showed in service discovery.
+Context:|gateway-mode
+Type:|string
+Default:|empty string
+
+This option configures type of transport as showed in service discovery. It is usually used by XMPP client to show proper
+icons according to type of network. See [Disco Categories](http://xmpp.org/registrar/disco-categories.html#gateway) for
+allowed values.
+
+#### service.allowed_servers
+
+Key | val
+----|----
+Description:|Configures list of servers from which users can connect and register Spectrum 2 transport.
+Context:|gateway-mode
+Type:|list of JIDs
+Default:|empty list
+
+Configures list of servers from which users can connect and register Spectrum 2 transport. This option is used together with
+registration.enable_public_registration option. If registration.enable_public_registration is set to 0, you can use this option
+as a white-list, to enable users from particular domain to use your Spectrum 2 instance, but disallow it to any other users.
+
+Following part of config file disables public registrations and allows only users from xmpp.org and jabber.org to use this Spectrum 2 instance:
+
+	[service]
+	allowed_servers=xmpp.org
+	allowed_servers=jabber.org
+	
+	[registration]
+	enable_public_registration=0
+
+#### service.cert
+
+Key | val
+----|----
+Description:|Configures certificate to be used for SSL encryption in server-mode.
+Context:|server-mode
+Type:|string
+Default:|empty string
+
+This option configures full path to PKCS#12 certificate which is used for SSL in server-mode. To find out, how to create
+such certificate, please read [Using SSL in server mode](http://spectrum.im/documentation/configuration/server_ssl.html).
+
+#### service.cert_password
+
+Key | val
+----|----
+Description:|Configures password for certificate which is used for SSL encryption in server-mode.
+Context:|server-mode
+Type:|string
+Default:|empty string
+
+This option configures password which is used to decrypt PKCS#12 certificate (if it is encrypted). For more information about SSL
+with Spectrum 2, read service.cert option description.
+
+
+#### service.port
+
+Key | val
+----|----
+Description:|Configures port on which Spectrum listens to in server-mode or to which connects in gateway-mode.
+Context:|server-mode and gateway-mode
+Type:|integer
+Default:|0
+
+This option configures port on which Spectrum listens to in server-mode or to which connects in gateway-mode. In server-mode
+the default port for XMPP servers is 5222, so you should use this port. In gateway-mode, you have to at first configure your
+server to allow Spectrum 2 to connect it as its component. On many servers, the default component port is 5347, but this option
+depends on particular XMPP server and its configuration.
+
+#### service.server
+
+Key | val
+----|----
+Description:|Configures hostname or IP address of server to which Spectrum 2 connects to.
+Context:|gateway-mode
+Type:|string
+Default:|empty string
+
+This option configures hostname or IP address of server to which Spectrum 2 connects to. It is used only in gateway-mode and
+you should configure it to point to hostname or IP of your XMPP server.
+
+#### service.server_mode
+
+Key | val
+----|----
+Description:|Configures if Spectrum 2 works in server mode or gateway mode
+Context:|server-mode and gateway-mode
+Type:|boolean
+Default:|0
+
+If this option is true, Spectrum 2 works in server-mode and acts as standalone server.
+
+User then logins legacy networks by logging XMPP account like this one: `my_msn_name%hotmail.com@msn.domain.tld`.
+
+**Advantages:**
+
+* Passwords are not stored on server.
+* Roster synchronization is easy, because Spectrum 2 acts as normal server.
+* If you want to use Spectrum 2 as wrapper between different networks, you don't need database or Jabber server as another layer.
+* Using SRV records you can easily run Spectrum 2 on different machines to scale it.
+
+**Disadvantages:**
+
+* Clients have to support more accounts to connect more legacy networks (Therefore they will need have to use more TCP connections).
+
+If this option is false, Spectrum 2 acts as normal XMPP component (gateway).
+
+You then have to configure an external XMPP server (like Prosody or Ejabberd) to serve the subdomain you want to use for Spectrum 2 (for example "icq.domain.tld"). Spectrum 2 in gateway mode then connects the XMPP server as its component and users are able to find out "icq.domain.tld" in Service Discovery, register it and use it.
+
+**Advantages:**
+
+* Users can use more legacy networks using single XMPP account (and using single TCP connection).
+* It's easy to extend existing XMPP servers using gateway mode.
+
+**Disadvantages:**
+
+* Passwords are stored (even in encrypted form) on server.
+* Roster (contact list) synchronization can be problematic, because it depends on the client user uses. This can be improved by usage of Remote Roster protoXEP.
+* You have to setup XMPP server and use database even if you only want to use Spectrum 2 as a tool to connect legacy networks using XMPP protocol.
+
+
diff --git a/documentation/index.md b/documentation/index.md
index 2fc06bdf..8ada76e6 100644
--- a/documentation/index.md
+++ b/documentation/index.md
@@ -9,9 +9,7 @@ title: Spectrum 2
 
 #### Installation
 
-* [Debian/Ubuntu packages](installation/debian_ubuntu.html)
-* [Fedora/RHEL/CentOS packages](installation/fedora_rhel.html)
-* [Gentoo ebuild](installation/gentoo.html)
+* [Installing using Docker](installation/docker.html)
 * [Installing from source code](installation/from_source_code.html)
 
 #### Tutorials
@@ -23,9 +21,15 @@ title: Spectrum 2
 * [Configuration file description](configuration/config_file.html)
 * [MySQL Support](configuration/mysql.html)
 * [PostgreSQL Support](configuration/postgresql.html)
-* [Using SSL in server mode](configuration/server_ssl.html)
 * [Logging](configuration/logging.html)
-* [Spectrum as bouncer](configuration/bouncer.html)
+
+#### Frontends
+
+* [Frontends overview](frontends/frontends.html)
+* [XMPP Frontend](frontends/xmpp.html)
+   * [Using SSL in server mode](configuration/server_ssl.html)
+   * [Spectrum 2 as bouncer](configuration/bouncer.html)
+* [Slack Frontend](frontends/slack.html)
 
 #### Backends
 
diff --git a/documentation/installation/docker.md b/documentation/installation/docker.md
new file mode 100644
index 00000000..a95b3722
--- /dev/null
+++ b/documentation/installation/docker.md
@@ -0,0 +1,53 @@
+---
+layout: page
+title: Spectrum 2
+---
+
+## Install Docker
+
+At first you have to install Docker. This is very well described on the official [Docker Installation page](https://docs.docker.com/v1.8/installation/).
+
+## Pull the Spectrum 2 Docker image
+
+To download Spectrum 2 Docker image to your system, just run following command:
+
+	$ docker pull spectrum2/spectrum2
+
+You can also update Spectrum 2 using this command later.
+
+## Create directory for Spectrum 2 configuration files
+
+Now you have to decide where to store the configuration files for Spectrum 2. We will use `/opt/spectrum2/` in our example:
+
+	$ mkdir /opt/spectrum2
+
+## Create configuration file
+
+You can use following default configuration files as a starting place:
+
+* [XMPP Frontend - gateway mode](https://github.com/hanzz/spectrum2/blob/spectrum/src/sample2_gateway.cfg)
+* [XMPP Frontend - server mode](https://github.com/hanzz/spectrum2/blob/spectrum/src/sample.cfg)
+
+Download the configuration file you chose into `/opt/spectrum` directory you have created earlier and edit it as you want. Check the documentation and tutorials for configuration examples.
+
+Note that the configuration files must have `.cfg` file extension.
+
+## Start Spectrum 2
+
+To start Spectrum 2 on background using Docker, all you have to do is running following Docker command:
+
+	$ docker run --name="spectrum2" -d -v /opt/spectrum2:/etc/spectrum2/transport spectrum2/spectrum2
+
+It will start Spectrum 2 and load the configuration files from `/opt/spectrum`. It also gives the spawned container name `spectrum2`.
+
+## Checking the Spectrum 2 logs
+
+To check the Spectrum 2 logs, use following Docker command:
+
+	$ docker logs spectrum2
+
+## Stopping the Spectrum 2
+
+To stop the Spectrum 2 container, use following Docker command:
+
+	$ docker stop spectrum2
diff --git a/download/index.md b/download/index.md
index 8eb5b811..0676f3e1 100644
--- a/download/index.md
+++ b/download/index.md
@@ -7,12 +7,5 @@ title: Spectrum 2
 
 Don't forget to check [Documentation](http://spectrum.im/documentation) and [Changelog](http://hanzz.github.com/libtransport/changelog) after downloading.
 
-#### Spectrum 2
-
-* [Debian/Ubuntu packages](http://spectrum.im/documentation/installation/debian_ubuntu.html)
-* [Fedora/RHEL/CentOS packages](http://spectrum.im/documentation/installation/fedora_rhel.html)
+* [Docker image](http://spectrum.im/documentation/installation/docker.html)
 * [Spectrum 2.0-beta2 source code](https://github.com/downloads/hanzz/libtransport/spectrum-2.0.0-beta2.tar.gz)
-
-#### Spectrum 1 - not maintained version
-
-* [Spectrum 1.4.8 source code](https://github.com/downloads/hanzz/libtransport/spectrum-1.4.8.tar.gz)
diff --git a/index.md b/index.md
index 28158a7c..cad9c4be 100644
--- a/index.md
+++ b/index.md
@@ -12,7 +12,7 @@ Spectrum 2 is an open source instant messaging transport.<br/><br/>
 It allows users to chat together even when they are using different IM networks.<br/><br/>
 It acts as a transport layer between the users as showed in the animation above.
 <br/>
-<a style="   position: absolute;bottom: 10px; right: 10px;" href="#">Read More</a>
+<a style="   position: absolute;bottom: 10px; right: 10px;" href="/documentation/about.html">Read More</a>
 </div>
 
 <div style="position: relative;width: 250px; height:394px; float:left; margin-left: 40px; color: #222; background-color: #fff;border-radius: 2px;-moz-border-radius: 2px;-webkit-border-radius: 2px;  padding: 10px; margin: 0 3px; box-shadow: 0 0 10px rgba(0,0,0,.1);margin-left: 25px;">
@@ -35,7 +35,7 @@ It acts as a transport layer between the users as showed in the animation above.
 <img alt="IRC" src="https://gci.copyleftgames.org/img/icons/irc.png" style="float:left;  margin-left:10px"/>
 <img alt="Twitter" src="https://addons.cdn.mozilla.net/user-media/addon_icons/480/480584-64.png" style="float:left; margin-left:10px"/>
 <div style="clear: both;"></div> 
-<a style="   position: absolute;bottom: 10px; right: 10px;" href="#">Read More</a>
+<a style="   position: absolute;bottom: 10px; right: 10px;" href="/documentation/about.html">Read More</a>
 </div>
 
 <div style="position: relative;width: 220px; height:394px; float:left; color: #222; background-color: #fff;border-radius: 2px;-moz-border-radius: 2px;-webkit-border-radius: 2px;  padding: 10px; margin: 0 3px; box-shadow: 0 0 10px rgba(0,0,0,.1);margin-left: 25px;">