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Installing Icinga 2

The recommended way of installing Icinga 2 is to use packages. The Icinga project provides both release and development packages for a number of operating systems.

Please check the documentation in the doc/ directory for a current list of available packages and detailed installation instructions.

The online documentation is available at docs.icinga.com and will guide you step by step.

There are a number of known caveats when installing from source such as incorrect directory and file permissions. So even if you're planning to not use the official packages it is advisable to build your own Debian or RPM packages.

Builds

This information is intended for developers and packagers.

Build Requirements

The following requirements need to be fulfilled in order to build the application using a dist tarball (package names for RHEL and Debian in parentheses):

cmake >= 2.6
GNU make (make)
C++ compiler which supports C++11 (gcc-c++ >= 4.7 on RHEL/SUSE, build-essential on Debian, alternatively clang++, build-base on Alpine)
RedHat Developer Tools on RHEL5/6 (details on building below)
pkg-config
OpenSSL library and header files >= 0.9.8 (openssl-devel on RHEL, libopenssl1-devel on SLES11, libopenssl-devel on SLES12, libssl-dev on Debian, libressl-dev on Alpine)
Boost library and header files >= 1.48.0 (boost148-devel on EPEL for RHEL / CentOS, libboost-all-dev on Debian, boost-dev on Alpine)
GNU bison (bison)
GNU flex (flex) >= 2.5.35
recommended: libexecinfo on FreeBSD (automatically used when Icinga 2 is installed via port or package)
optional: MySQL (mysql-devel on RHEL, libmysqlclient-devel on SUSE, libmysqlclient-dev until Debian 8 jessie / default-libmysqlclient-dev from Debian 9 stretch, mariadb-dev on Alpine); set CMake variable ICINGA2_WITH_MYSQL to OFF to disable this module
optional: PostgreSQL (postgresql-devel on RHEL, libpq-dev on Debian, postgresql-dev on Alpine); set CMake variable ICINGA2_WITH_PGSQL to OFF to disable this module
optional: YAJL (yajl-devel on RHEL, libyajl-dev on Debian, yajl-dev on Alpine)
optional: libedit (libedit-devel on CentOS (RHEL requires rhel-7-server-optional-rpms repository for el7 e.g.), libedit-dev on Debian and Alpine)
optional: Termcap (libtermcap-devel on RHEL, not necessary on Debian) - only required if libedit doesn't already link against termcap/ncurses
optional: libwxgtk2.8-dev or newer (wxGTK-devel and wxBase) - only required when building the Icinga 2 Studio

Note: RHEL5 ships an ancient flex version. Updated packages are available for example from the repoforge buildtools repository.

User Requirements

By default Icinga will run as user 'icinga' and group 'icinga'. Additionally the external command pipe and livestatus features require a dedicated command group 'icingacmd'. You can choose your own user/group names and pass them to CMake using the ICINGA2_USER, ICINGA2_GROUP and ICINGA2_COMMAND_GROUP variables.

# groupadd icinga
# groupadd icingacmd
# useradd -c "icinga" -s /sbin/nologin -G icingacmd -g icinga icinga

On Alpine (which uses ash busybox) you can run:

# addgroup -S icinga
# addgroup -S icingacmd
# adduser -S -D -H -h /var/spool/icinga2 -s /sbin/nologin -G icinga -g icinga icinga
# adduser icinga icingacmd

Add the web server user to the icingacmd group in order to grant it write permissions to the external command pipe and livestatus socket:

# usermod -a -G icingacmd www-data

Make sure to replace "www-data" with the name of the user your web server is running as.

Building Icinga 2

Once you have installed all the necessary build requirements you can build Icinga 2 using the following commands:

$ mkdir build && cd build
$ cmake ..
$ make
$ make install

You can specify an alternative installation prefix using -DCMAKE_INSTALL_PREFIX:

$ cmake .. -DCMAKE_INSTALL_PREFIX=/tmp/icinga2

In addition to CMAKE_INSTALL_PREFIX the following Icinga-specific cmake variables are supported:

ICINGA2_USER: The user Icinga 2 should run as; defaults to icinga
ICINGA2_GROUP: The group Icinga 2 should run as; defaults to icinga
ICINGA2_GIT_VERSION_INFO: Whether to use Git to determine the version number; defaults to ON
ICINGA2_COMMAND_GROUP: The command group Icinga 2 should use; defaults to icingacmd
ICINGA2_UNITY_BUILD: Whether to perform a unity build; defaults to ON
ICINGA2_LTO_BUILD: Whether to use link time optimization (LTO); defaults to OFF
ICINGA2_PLUGINDIR: The path for the Monitoring Plugins project binaries; defaults to /usr/lib/nagios/plugins
ICINGA2_RUNDIR: The location of the "run" directory; defaults to CMAKE_INSTALL_LOCALSTATEDIR/run
CMAKE_INSTALL_SYSCONFDIR: The configuration directory; defaults to CMAKE_INSTALL_PREFIX/etc
ICINGA2_SYSCONFIGFILE: Where to put the config file the initscript/systemd pulls it's dirs from; defaults to CMAKE_INSTALL_PREFIX/etc/sysconfig/icinga2
CMAKE_INSTALL_LOCALSTATEDIR: The state directory; defaults to CMAKE_INSTALL_PREFIX/var
USE_SYSTEMD=ON|OFF: Use systemd or a classic SysV initscript; defaults to OFF
INSTALL_SYSTEMD_SERVICE_AND_INITSCRIPT=ON|OFF Force install both the systemd service definition file and the SysV initscript in parallel, regardless of how USE_SYSTEMD is set. Only use this for special packaging purposes and if you know what you are doing. Defaults to OFF.
ICINGA2_WITH_MYSQL: Determines whether the MySQL IDO module is built; defaults to ON
ICINGA2_WITH_PGSQL: Determines whether the PostgreSQL IDO module is built; defaults to ON
ICINGA2_WITH_CHECKER: Determines whether the checker module is built; defaults to ON
ICINGA2_WITH_COMPAT: Determines whether the compat module is built; defaults to ON
ICINGA2_WITH_DEMO: Determines whether the demo module is built; defaults to OFF
ICINGA2_WITH_HELLO: Determines whether the hello module is built; defaults to OFF
ICINGA2_WITH_LIVESTATUS: Determines whether the Livestatus module is built; defaults to ON
ICINGA2_WITH_NOTIFICATION: Determines whether the notification module is built; defaults to ON
ICINGA2_WITH_PERFDATA: Determines whether the perfdata module is built; defaults to ON
ICINGA2_WITH_STUDIO: Determines whether the Icinga Studio application is built; defaults to OFF
ICINGA2_WITH_TESTS: Determines whether the unit tests are built; defaults to ON

CMake determines the Icinga 2 version number using git describe if the source directory is contained in a Git repository. Otherwise the version number is extracted from the icinga2.spec file. This behavior can be overridden by creating a file called icinga-version.h.force in the source directory. Alternatively the -DICINGA2_GIT_VERSION_INFO=OFF option for CMake can be used to disable the usage of git describe.

Build Icinga 2 RPMs

Build Environment on RHEL, CentOS, Fedora, Amazon Linux

Setup your build environment:

yum -y install rpmdevtools

Build Environment on SuSE/SLES

SLES:

zypper addrepo http://download.opensuse.org/repositories/devel:tools/SLE_12_SP2/devel:tools.repo
zypper refresh
zypper install rpmdevtools spectool

OpenSuSE:

zypper addrepo http://download.opensuse.org/repositories/devel:tools/openSUSE_Leap_42.3/devel:tools.repo
zypper refresh
zypper install rpmdevtools spectool

Package Builds

Prepare the rpmbuild directory tree:

cd $HOME
rpmdev-setuptree

Copy the icinga2.spec file to rpmbuild/SPEC or fetch the latest version:

curl https://raw.githubusercontent.com/Icinga/icinga2/master/icinga2.spec -o $HOME/rpmbuild/SPECS/icinga2.spec

Copy the tarball to rpmbuild/SOURCES e.g. by using the spectool binary provided with rpmdevtools:

cd $HOME/rpmbuild/SOURCES
spectool -g ../SPECS/icinga2.spec

cd $HOME/rpmbuild

Install the build dependencies. Example for CentOS 7:

yum -y install libedit-devel ncurses-devel gcc-c++ libstdc++-devel openssl-devel \
cmake flex bison boost-devel systemd mysql-devel postgresql-devel httpd \
selinux-policy-devel checkpolicy selinux-policy selinux-policy-doc

Note: If you are using Amazon Linux, systemd is not required.

A shorter way is available using the yum-builddep command on RHEL based systems:

yum-builddep SPECS/icinga2.spec

Build the RPM:

rpmbuild -ba SPECS/icinga2.spec

Additional Hints

SELinux policy module

The following packages are required to build the SELinux policy module:

checkpolicy
selinux-policy (selinux-policy on CentOS 6, selinux-policy-devel on CentOS 7)
selinux-policy-doc

RHEL/CentOS 5 and 6

The RedHat Developer Toolset is required for building Icinga 2 beforehand. This contains a modern version of flex and a C++ compiler which supports C++11 features.

cat >/etc/yum.repos.d/devtools-2.repo <<REPO
[testing-devtools-2-centos-\$releasever]
name=testing 2 devtools for CentOS $releasever
baseurl=https://people.centos.org/tru/devtools-2/\$releasever/\$basearch/RPMS
gpgcheck=0
REPO

Dependencies to devtools-2 are used in the RPM SPEC, so the correct tools should be used for building.

As an alternative, you can use newer Boost packages provided on packages.icinga.com.

cat >$HOME/.rpmmacros <<MACROS
%build_icinga_org 1
MACROS

Amazon Linux

If you prefer to build packages offline, a suitable Vagrant box is located here.

SLES 11

The Icinga repository provides the required boost package version and must be added before building.

Build Icinga 2 Debian/Ubuntu packages

Setup your build environment on Debian/Ubuntu, copy the 'debian' directory from the Debian packaging Git repository (https://github.com/Icinga/pkg-icinga2-debian) into your source tree and run the following command:

$ dpkg-buildpackage -uc -us

Build Alpine Linux packages

A simple way to setup a build environment is installing Alpine in a chroot. In this way, you can set up an Alpine build environment in a chroot under a different Linux distro. There is a script that simplifies these steps with just two commands, and can be found here.

Once the build environment is installed, you can setup the system to build the packages by following this document.

Build Post Install Tasks

After building Icinga 2 yourself, your package build system should at least run the following post install requirements:

enable the checker, notification and mainlog feature by default
run 'icinga2 api setup' in order to enable the api feature and generate SSL certificates for the node

Run Icinga 2

Icinga 2 comes with a binary that takes care of loading all the relevant components (e.g. for check execution, notifications, etc.):

# icinga2 daemon
[2016-12-08 16:44:24 +0100] information/cli: Icinga application loader (version: v2.5.4-231-gb10a6b7; debug)
[2016-12-08 16:44:24 +0100] information/cli: Loading configuration file(s).
[2016-12-08 16:44:25 +0100] information/ConfigItem: Committing config item(s).
...

Init Script

Icinga 2 can be started as a daemon using the provided init script:

# /etc/init.d/icinga2
Usage: /etc/init.d/icinga2 {start|stop|restart|reload|checkconfig|status}

Systemd

If your distribution uses Systemd:

# systemctl {start|stop|reload|status|enable|disable} icinga2

In case the distribution is running Systemd >227, you'll also need to package and install the etc/initsystem/icinga2.service.limits.conf file into /etc/systemd/system/icinga2.service.d.

openrc

Or if your distribution uses openrc (like Alpine):

# rc-service icinga2
Usage: /etc/init.d/icinga2 {start|stop|restart|reload|checkconfig|status}

Note: the openrc's init.d is not shipped by default. A working init.d with openrc can be found here: (https://git.alpinelinux.org/cgit/aports/plain/community/icinga2/icinga2.initd). If you have customized some path, edit the file and adjust it according with your setup. Those few steps can be followed:

# wget https://git.alpinelinux.org/cgit/aports/plain/community/icinga2/icinga2.initd
# mv icinga2.initd /etc/init.d/icinga2
# chmod +x /etc/init.d/icinga2

Icinga 2 reads a single configuration file which is used to specify all configuration settings (global settings, hosts, services, etc.). The configuration format is explained in detail in the doc/ directory.

By default make install installs example configuration files in /usr/local/etc/icinga2 unless you have specified a different prefix or sysconfdir.

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