# Getting Started This tutorial is a step-by-step introduction to installing [Icinga 2](2-getting-started.md#setting-up-icinga2) and [Icinga Web 2](2-getting-started.md#setting-up-icingaweb2). It assumes that you are familiar with the operating system you're using to install Icinga 2. ## Setting up Icinga 2 First off you will have to install Icinga 2. The preferred way of doing this is to use the official package repositories depending on which operating system and distribution you are running. Distribution | Repository ------------------------|--------------------------- Debian | [debmon](https://debmon.org/packages/debmon-jessie/icinga2), [Icinga Repository](http://packages.icinga.org/debian/) Ubuntu | [Icinga PPA](https://launchpad.net/~formorer/+archive/ubuntu/icinga), [Icinga Repository](http://packages.icinga.org/ubuntu/) RHEL/CentOS | [Icinga Repository](http://packages.icinga.org/epel/) openSUSE | [Icinga Repository](http://packages.icinga.org/openSUSE/), [Server Monitoring Repository](https://build.opensuse.org/package/show/server:monitoring/icinga2) SLES | [Icinga Repository](http://packages.icinga.org/SUSE/) Gentoo | [Upstream](http://packages.gentoo.org/package/net-analyzer/icinga2) FreeBSD | [Upstream](http://www.freshports.org/net-mgmt/icinga2) ArchLinux | [Upstream](https://aur.archlinux.org/packages/icinga2) Packages for distributions other than the ones listed above may also be available. Please contact your distribution packagers. ### Package Repositories You need to add the Icinga repository to your package management configuration. Below is a list with examples for the various distributions. Debian (debmon): # wget -O - https://debmon.org/debmon/repo.key 2>/dev/null | apt-key add - # echo 'deb http://debmon.org/debmon debmon-jessie main' >/etc/apt/sources.list.d/debmon.list # apt-get update Ubuntu (PPA): # add-apt-repository ppa:formorer/icinga # apt-get update RHEL/CentOS 7: yum install https://packages.icinga.org/epel/7/release/noarch/icinga-rpm-release-7-1.el7.centos.noarch.rpm RHEL/CentOS 6: yum install https://packages.icinga.org/epel/6/release/noarch/icinga-rpm-release-6-1.el6.noarch.rpm RHEL/CentOS 5: rpm -i http://packages.icinga.org/epel/5/release/noarch/icinga-rpm-release-5-1.el5.centos.noarch.rpm The packages for RHEL/CentOS depend on other packages which are distributed as part of the [EPEL repository](http://fedoraproject.org/wiki/EPEL). Please make sure to enable this repository by following [these instructions](http://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F). Fedora 23: dnf install https://packages.icinga.org/fedora/23/release/noarch/icinga-rpm-release-23-1.fc23.noarch.rpm Fedora 22: dnf install https://packages.icinga.org/fedora/22/release/noarch/icinga-rpm-release-22-1.fc22.noarch.rpm Fedora 21: yum install http://packages.icinga.org/fedora/21/release/noarch/icinga-rpm-release-21-1.fc21.noarch.rpm SLES 11: # zypper ar http://packages.icinga.org/SUSE/ICINGA-release-11.repo # zypper ref The packages for SLES 11 depend on the `openssl1` package which is distributed as part of the [SLES 11 Security Module](https://www.suse.com/communities/conversations/introducing-the-suse-linux-enterprise-11-security-module/). SLES 12: # zypper ar http://packages.icinga.org/SUSE/ICINGA-release.repo # zypper ref openSUSE: # zypper ar http://packages.icinga.org/openSUSE/ICINGA-release.repo # zypper ref ### Installing Icinga 2 You can install Icinga 2 by using your distribution's package manager to install the `icinga2` package. Debian/Ubuntu: # apt-get install icinga2 RHEL/CentOS 5/6: # yum install icinga2 # chkconfig icinga2 on # service icinga2 start RHEL/CentOS 7 and Fedora: # yum install icinga2 # systemctl enable icinga2 # systemctl start icinga2 SLES/openSUSE: # zypper install icinga2 FreeBSD: # pkg install icinga2 ### Enabled Features during Installation The default installation will enable three features required for a basic Icinga 2 installation: * `checker` for executing checks * `notification` for sending notifications * `mainlog` for writing the `icinga2.log` file You can verify that by calling `icinga2 feature list` [CLI command](8-cli-commands.md#cli-command-feature) to see which features are enabled and disabled. # icinga2 feature list Disabled features: api command compatlog debuglog graphite icingastatus ido-mysql ido-pgsql livestatus notification perfdata statusdata syslog Enabled features: checker mainlog notification ### Installation Paths By default Icinga 2 uses the following files and directories: Path | Description ------------------------------------|------------------------------------ /etc/icinga2 | Contains Icinga 2 configuration files. /etc/init.d/icinga2 | The Icinga 2 init script. /usr/sbin/icinga2 | The Icinga 2 binary. /usr/share/doc/icinga2 | Documentation files that come with Icinga 2. /usr/share/icinga2/include | The Icinga Template Library and plugin command configuration. /var/run/icinga2 | PID file. /var/run/icinga2/cmd | Command pipe and Livestatus socket. /var/cache/icinga2 | status.dat/objects.cache, icinga2.debug files /var/spool/icinga2 | Used for performance data spool files. /var/lib/icinga2 | Icinga 2 state file, cluster log, local CA and configuration files. /var/log/icinga2 | Log file location and compat/ directory for the CompatLogger feature. FreeBSD uses slightly different paths: By default Icinga 2 uses the following files and directories: Path | Description ------------------------------------|------------------------------------ /usr/local/etc/icinga2 | Contains Icinga 2 configuration files. /usr/local/etc/rc.d/icinga2 | The Icinga 2 init script. /usr/local/sbin/icinga2 | The Icinga 2 binary. /usr/local/share/doc/icinga2 | Documentation files that come with Icinga 2. /usr/local/share/icinga2/include | The Icinga Template Library and plugin command configuration. /var/run/icinga2 | PID file. /var/run/icinga2/cmd | Command pipe and Livestatus socket. /var/cache/icinga2 | status.dat/objects.cache, icinga2.debug files /var/spool/icinga2 | Used for performance data spool files. /var/lib/icinga2 | Icinga 2 state file, cluster log, local CA and configuration files. /var/log/icinga2 | Log file location and compat/ directory for the CompatLogger feature. ## Setting up Check Plugins Without plugins Icinga 2 does not know how to check external services. The [Monitoring Plugins Project](https://www.monitoring-plugins.org/) provides an extensive set of plugins which can be used with Icinga 2 to check whether services are working properly. > **Note** > > These plugins are required to make the [example configuration](4-configuring-icinga-2.md#configuring-icinga2-overview) > work out-of-the-box. For your convenience here is a list of package names for some of the more popular operating systems/distributions: OS/Distribution | Package Name | Repository | Installation Path -----------------------|--------------------|---------------------------|---------------------------- RHEL/CentOS | nagios-plugins-all | [EPEL](http://fedoraproject.org/wiki/EPEL) | /usr/lib/nagios/plugins or /usr/lib64/nagios/plugins SLES/OpenSUSE | monitoring-plugins | [server:monitoring](https://build.opensuse.org/project/repositories/server:monitoring) | /usr/lib/nagios/plugins Debian/Ubuntu | nagios-plugins | - | /usr/lib/nagios/plugins FreeBSD | monitoring-plugins | - | /usr/local/libexec/nagios OS X | nagios-plugins | [MacPorts](http://www.macports.org), [Homebrew](http://brew.sh) | /opt/local/libexec or /usr/local/sbin The recommended way of installing these standard plugins is to use your distribution's package manager. Debian/Ubuntu: # apt-get install nagios-plugins RHEL/CentOS: # yum install nagios-plugins-all The packages for RHEL/CentOS depend on other packages which are distributed as part of the [EPEL repository](http://fedoraproject.org/wiki/EPEL). Please make sure to enable this repository by following [these instructions](http://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F). Fedora: # dnf install nagios-plugins-all SLES/openSUSE: # zypper install monitoring-plugins The packages for SLES/OpenSUSE depend on other packages which are distributed as part of the [server:monitoring repository](https://build.opensuse.org/project/repositories/server:monitoring). Please make sure to enable this repository beforehand. FreeBSD: # pkg install monitoring-plugins Depending on which directory your plugins are installed into you may need to update the global `PluginDir` constant in your [Icinga 2 configuration](4-configuring-icinga-2.md#constants-conf). This constant is used by the check command definitions contained in the Icinga Template Library to determine where to find the plugin binaries. > **Note** > > Please refer to the [plugins](14-addons-plugins.md#plugins) chapter for details about how to integrate > additional check plugins into your Icinga 2 setup. ## Running Icinga 2 ### Init Script Icinga 2's init script is installed in `/etc/init.d/icinga2` (`/usr/local/etc/rc.d/icinga2` on FreeBSD) by default: # /etc/init.d/icinga2 Usage: /etc/init.d/icinga2 {start|stop|restart|reload|checkconfig|status} The init script supports the following actions: Command | Description --------------------|------------------------ start | The `start` action starts the Icinga 2 daemon. stop | The `stop` action stops the Icinga 2 daemon. restart | The `restart` action is a shortcut for running the `stop` action followed by `start`. reload | The `reload` action sends the `HUP` signal to Icinga 2 which causes it to restart. Unlike the `restart` action `reload` does not wait until Icinga 2 has restarted. checkconfig | The `checkconfig` action checks if the `/etc/icinga2/icinga2.conf` configuration file contains any errors. status | The `status` action checks if Icinga 2 is running. By default the Icinga 2 daemon is running as `icinga` user and group using the init script. Using Debian packages the user and group are set to `nagios` for historical reasons. ### systemd Service Some distributions (e.g. Fedora, openSUSE and RHEL/CentOS 7) use systemd. The Icinga 2 packages automatically install the necessary systemd unit files. The Icinga 2 systemd service can be (re-)started, reloaded, stopped and also queried for its current status. # systemctl status icinga2 icinga2.service - Icinga host/service/network monitoring system Loaded: loaded (/usr/lib/systemd/system/icinga2.service; disabled) Active: active (running) since Mi 2014-07-23 13:39:38 CEST; 15s ago Process: 21692 ExecStart=/usr/sbin/icinga2 -c ${ICINGA2_CONFIG_FILE} -d -e ${ICINGA2_ERROR_LOG} -u ${ICINGA2_USER} -g ${ICINGA2_GROUP} (code=exited, status=0/SUCCESS) Process: 21674 ExecStartPre=/usr/sbin/icinga2-prepare-dirs /etc/sysconfig/icinga2 (code=exited, status=0/SUCCESS) Main PID: 21727 (icinga2) CGroup: /system.slice/icinga2.service 21727 /usr/sbin/icinga2 -c /etc/icinga2/icinga2.conf -d -e /var/log/icinga2/error.log -u icinga -g icinga --no-stack-rlimit Jul 23 13:39:38 nbmif icinga2[21692]: [2014-07-23 13:39:38 +0200] information/ConfigItem: Checked 309 Service(s). Jul 23 13:39:38 nbmif icinga2[21692]: [2014-07-23 13:39:38 +0200] information/ConfigItem: Checked 1 User(s). Jul 23 13:39:38 nbmif icinga2[21692]: [2014-07-23 13:39:38 +0200] information/ConfigItem: Checked 15 Notification(s). Jul 23 13:39:38 nbmif icinga2[21692]: [2014-07-23 13:39:38 +0200] information/ConfigItem: Checked 4 ScheduledDowntime(s). Jul 23 13:39:38 nbmif icinga2[21692]: [2014-07-23 13:39:38 +0200] information/ConfigItem: Checked 1 UserGroup(s). Jul 23 13:39:38 nbmif icinga2[21692]: [2014-07-23 13:39:38 +0200] information/ConfigItem: Checked 1 IcingaApplication(s). Jul 23 13:39:38 nbmif icinga2[21692]: [2014-07-23 13:39:38 +0200] information/ConfigItem: Checked 8 Dependency(s). Jul 23 13:39:38 nbmif systemd[1]: Started Icinga host/service/network monitoring system. The `systemctl` command supports the following actions: Command | Description --------------------|------------------------ start | The `start` action starts the Icinga 2 daemon. stop | The `stop` action stops the Icinga 2 daemon. restart | The `restart` action is a shortcut for running the `stop` action followed by `start`. reload | The `reload` action sends the `HUP` signal to Icinga 2 which causes it to restart. Unlike the `restart` action `reload` does not wait until Icinga 2 has restarted. status | The `status` action checks if Icinga 2 is running. enable | The `enable` action enables the service being started at system boot time (similar to `chkconfig`) Examples: # systemctl enable icinga2 # systemctl restart icinga2 Job for icinga2.service failed. See 'systemctl status icinga2.service' and 'journalctl -xn' for details. If you're stuck with configuration errors, you can manually invoke the [configuration validation](8-cli-commands.md#config-validation). ### FreeBSD On FreeBSD you need to enable icinga2 in your rc.conf # sysrc icinga2_enable=yes # service icinga2 restart ## Configuration Syntax Highlighting Icinga 2 ships configuration examples for syntax highlighting using the `vim` and `nano` editors. The RHEL and SUSE package `icinga2-common` installs these files into `/usr/share/doc/icinga2-common-[x.x.x]/syntax` (where `[x.x.x]` is the version number, e.g. `2.4.3` or `2.4.4`). Sources provide these files in `tools/syntax`. On Debian systems the `icinga2-common` package provides only the Nano configuration file (`/usr/share/nano/icinga2.nanorc`); to obtain the Vim configuration, please install the extra package `vim-icinga2`. The files are located in `/usr/share/vim/addons`. ### Configuration Syntax Highlighting using Vim Create a new local vim configuration storage in your home directory (`~/.vim`), if it doesn't exist already. The `~/.vim/syntax` directory contains the actual syntax file and the one in `~/.vim/ftdetect` is used to detect the file type. Both are called `icinga2.vim`. $ PREFIX=~/.vim $ mkdir -p $PREFIX/{syntax,ftdetect} $ cd /usr/share/doc/icinga2-common-[x.x.x]/syntax/vim $ cp syntax/icinga2.vim $PREFIX/syntax/ $ cp ftdetect/icinga2.vim $PREFIX/ftdetect/ On Debian systems replace the path `/usr/share/doc/icinga2-common-[x.x.x]/syntax/vim` with `/usr/share/vim/addons`. Alternatively, you can use the `vim-addons` tool to create the `~/.vim/syntax` and `~/.vim/ftdetect` directories and create symlinks to the files in `/usr/share/vim/addons`: $ vim-addons install icinga2 Info: installing removed addon 'icinga2' to /home/root/.vim $ ls -l /home/root/.vim/* /home/root/.vim/ftdetect: lrwxrwxrwx 1 root root [...] icinga2.vim -> /usr/share/vim/addons/ftdetect/icinga2.vim /home/root/.vim/syntax: lrwxrwxrwx 1 root root [...] icinga2.vim -> /usr/share/vim/addons/syntax/icinga2.vim Test it: $ vim /etc/icinga2/conf.d/templates.conf ![Vim with syntax highlighting](images/getting-started/vim-syntax.png "Vim with Icinga 2 syntax highlighting") ### Configuration Syntax Highlighting using Nano Copy the `/etc/nanorc` sample file to your home directory and rename it to `~/.nanorc`. Create the `/etc/nano` directory and copy the provided `icinga2.nanorc` into it. $ cp /etc/nanorc ~/.nanorc # mkdir -p /etc/nano # cp /usr/share/doc/icinga2-common-[x.x.x]/syntax/nano/icinga2.nanorc /etc/nano On Debian systems change `/usr/share/doc/icinga2-common-[x.x.x]/syntax/nano/icinga2.nanorc` to `/usr/share/nano/icinga2.nanorc`. Then include the icinga2.nanorc file in your ~/.nanorc by adding the following line: ## Icinga 2 include "/etc/nano/icinga2.nanorc" Test it: $ nano /etc/icinga2/conf.d/templates.conf ![Nano with syntax highlighting](images/getting-started/nano-syntax.png "Nano with Icinga 2 syntax highlighting") ## Setting up Icinga Web 2 Icinga 2 can be used with Icinga Web 2 and a number of other web interfaces. This chapter explains how to set up Icinga Web 2. The DB IDO (Database Icinga Data Output) modules for Icinga 2 take care of exporting all configuration and status information into a database. The IDO database is used by a number of projects including [Icinga Web 2](2-getting-started.md#setting-up-icingaweb2), Icinga Reporting or Icinga Web 1.x. There is a separate module for each database backend. At present support for both MySQL and PostgreSQL is implemented. ### Configuring DB IDO MySQL #### Installing MySQL database server Debian/Ubuntu: # apt-get install mysql-server mysql-client RHEL/CentOS 5/6: # yum install mysql-server mysql # chkconfig mysqld on # service mysqld start # mysql_secure_installation RHEL/CentOS 7 and Fedora: # yum install mariadb-server mariadb # systemctl enable mariadb # systemctl start mariadb # mysql_secure_installation SUSE: # zypper install mysql mysql-client # chkconfig mysqld on # service mysqld start FreeBSD: # pkg install mysql56-server # sysrc mysql_enable=yes # service mysql-server restart # mysql_secure_installation #### Installing the IDO modules for MySQL The next step is to install the `icinga2-ido-mysql` package using your distribution's package manager. Debian/Ubuntu: # apt-get install icinga2-ido-mysql RHEL/CentOS: # yum install icinga2-ido-mysql SUSE: # zypper install icinga2-ido-mysql FreeBSD: On FreeBSD the IDO modules for MySQL are included with the icinga2 package and located at /usr/local/share/icinga2-ido-mysql/schema/mysql.sql > **Note** > > The Debian/Ubuntu packages provide a database configuration wizard by > default. You can skip the automated setup and install/upgrade the > database manually if you prefer that. #### Setting up the MySQL database Set up a MySQL database for Icinga 2: # mysql -u root -p mysql> CREATE DATABASE icinga; mysql> GRANT SELECT, INSERT, UPDATE, DELETE, DROP, CREATE VIEW, INDEX, EXECUTE ON icinga.* TO 'icinga'@'localhost' IDENTIFIED BY 'icinga'; mysql> quit ![setting up the database on CentOS 7](images/getting-started/mariadb-centos7.png "Setting up the database on CentOS 7") After creating the database you can import the Icinga 2 IDO schema using the following command: # mysql -u root -p icinga < /usr/share/icinga2-ido-mysql/schema/mysql.sql #### Enabling the IDO MySQL module The package provides a new configuration file that is installed in `/etc/icinga2/features-available/ido-mysql.conf`. You will need to update the database credentials in this file. All available attributes are explained in the [IdoMysqlConnection object](6-object-types.md#objecttype-idomysqlconnection) chapter. You can enable the `ido-mysql` feature configuration file using `icinga2 feature enable`: # icinga2 feature enable ido-mysql Module 'ido-mysql' was enabled. Make sure to restart Icinga 2 for these changes to take effect. After enabling the ido-mysql feature you have to restart Icinga 2: Debian/Ubuntu, RHEL/CentOS 6 and SUSE: # service icinga2 restart RHEL/CentOS 7 and Fedora: # systemctl restart icinga2 FreeBSD: # service icinga2 restart ### Configuring DB IDO PostgreSQL #### Installing PostgreSQL database server Debian/Ubuntu: # apt-get install postgresql RHEL/CentOS 5/6: # yum install postgresql-server postgresql # chkconfig postgresql on # service postgresql start RHEL/CentOS 7: # yum install postgresql-server postgresql # postgresql-setup initdb # systemctl enable postgresql # systemctl start postgresql SUSE: # zypper install postgresql postgresql-server # chkconfig postgresql on # service postgresql start FreeBSD: # pkg install postgresql93-server # sysrc postgresql_enable=yes # service postgresql start #### Installing the IDO modules for PostgreSQL The next step is to install the `icinga2-ido-pgsql` package using your distribution's package manager. Debian/Ubuntu: # apt-get install icinga2-ido-pgsql RHEL/CentOS: # yum install icinga2-ido-pgsql SUSE: # zypper install icinga2-ido-pgsql FreeBSD: On FreeBSD the IDO modules for PostgreSQL are included with the icinga2 package and located at /usr/local/share/icinga2-ido-pgsql/schema/pgsql.sql > **Note** > > Upstream Debian packages provide a database configuration wizard by default. > You can skip the automated setup and install/upgrade the database manually > if you prefer that. #### Setting up the PostgreSQL database Set up a PostgreSQL database for Icinga 2: # cd /tmp # sudo -u postgres psql -c "CREATE ROLE icinga WITH LOGIN PASSWORD 'icinga'" # sudo -u postgres createdb -O icinga -E UTF8 icinga # sudo -u postgres createlang plpgsql icinga > **Note** > > When using PostgreSQL 9.x you can omit the `createlang` command. > Also it is assumed here that your locale is set to utf-8, you may run into > problems otherwise. Locate your pg\_hba.conf (Debian: `/etc/postgresql/*/main/pg_hba.conf`, RHEL/SUSE: `/var/lib/pgsql/data/pg_hba.conf`), add the icinga user with md5 authentication method and restart the postgresql server. # icinga local icinga icinga md5 host icinga icinga 127.0.0.1/32 md5 host icinga icinga ::1/128 md5 # "local" is for Unix domain socket connections only local all all ident # IPv4 local connections: host all all 127.0.0.1/32 ident # IPv6 local connections: host all all ::1/128 ident # service postgresql restart After creating the database and permissions you can import the Icinga 2 IDO schema using the following command: # export PGPASSWORD=icinga # psql -U icinga -d icinga < /usr/share/icinga2-ido-pgsql/schema/pgsql.sql ![importing the Icinga 2 IDO schema](images/getting-started/postgr-import-ido.png "Importing the Icinga 2 IDO schema on Debian Jessie") #### Enabling the IDO PostgreSQL module The package provides a new configuration file that is installed in `/etc/icinga2/features-available/ido-pgsql.conf`. You will need to update the database credentials in this file. All available attributes are explained in the [IdoPgsqlConnection object](6-object-types.md#objecttype-idopgsqlconnection) chapter. You can enable the `ido-pgsql` feature configuration file using `icinga2 feature enable`: # icinga2 feature enable ido-pgsql Module 'ido-pgsql' was enabled. Make sure to restart Icinga 2 for these changes to take effect. After enabling the ido-pgsql feature you have to restart Icinga 2: Debian/Ubuntu, RHEL/CentOS 6, SUSE and FreeBSD: # service icinga2 restart RHEL/CentOS 7 and Fedora: # systemctl restart icinga2 ### Webserver Debian/Ubuntu: # apt-get install apache2 RHEL/CentOS 6: # yum install httpd # chkconfig httpd on # service httpd start RHEL/CentOS 7/Fedora: # yum install httpd # systemctl enable httpd # systemctl start httpd SUSE: # zypper install apache2 # chkconfig on # service apache2 start FreeBSD (nginx, but you could also use the apache24 package): # pkg install nginx php56-gettext php56-ldap php56-openssl php56-mysql php56-pdo_mysql php56-pgsql php56-pdo_pgsql php56-sockets php56-gd pecl-imagick pecl-intl # sysrc php_fpm_enable=yes # sysrc nginx_enable=yes # sed -i '' "s/listen\ =\ 127.0.0.1:9000/listen\ =\ \/var\/run\/php5-fpm.sock/" /usr/local/etc/php-fpm.conf # sed -i '' "s/;listen.owner/listen.owner/" /usr/local/etc/php-fpm.conf # sed -i '' "s/;listen.group/listen.group/" /usr/local/etc/php-fpm.conf # sed -i '' "s/;listen.mode/listen.mode/" /usr/local/etc/php-fpm.conf # service php-fpm start # service nginx start ### Firewall Rules Example: # iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT # service iptables save RHEL/CentOS 7 specific: # firewall-cmd --add-service=http # firewall-cmd --permanent --add-service=http FreeBSD: Please consult the [FreeBSD Handbook](https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/firewalls.html) how to configure one of FreeBSD's firewalls. ### Setting Up External Command Pipe Web interfaces and other Icinga addons are able to send commands to Icinga 2 through the external command pipe. You can enable the External Command Pipe using the CLI: # icinga2 feature enable command After that you will have to restart Icinga 2: Debian/Ubuntu, RHEL/CentOS 6 and SUSE: # service icinga2 restart RHEL/CentOS 7 and Fedora: # systemctl restart icinga2 FreeBSD: # service icinga2 restart By default the command pipe file is owned by the group `icingacmd` with read/write permissions. Add your webserver's user to the group `icingacmd` to enable sending commands to Icinga 2 through your web interface: # usermod -a -G icingacmd www-data FreeBSD: On FreeBSD the rw directory is owned by the group `www`. You do not need to add the user `icinga` to the group `www`. Debian packages use `nagios` as the default user and group name. Therefore change `icingacmd` to `nagios`. The webserver's user is different between distributions so you might have to change `www-data` to `wwwrun`, `www`, or `apache`. Change `www-data` to the user you're using to run queries. You can verify that the user has been successfully added to the `icingacmd` group using the `id` command: $ id ![id command on CentOS 7](images/getting-started/id-apache-centos7.png "Confirm that the webserver's user (here: `apache` on a CentOS 7 system) is a member of the group `icingacmd`.") ### Installing Icinga Web 2 Please consult the [installation documentation](https://github.com/Icinga/icingaweb2/blob/master/doc/02-Installation.md) for further instructions on how to install Icinga Web 2. ## Addons A number of additional features are available in the form of addons. A list of popular addons is available in the [Addons and Plugins](14-addons-plugins.md#addons-plugins) chapter.