Fedora 26: Install Nagios for web base system monitor tool

This article will describe installing Nagios which is a web-base system monitor tool.

Some plugins does not work correctly (nagios-plugins-load and nagios-plugins-ping).

1 Install Nagios

The following script will install Nagios.

  • NAGIOS_PASSWD is password of nagiosadmin user for Basic authentication.

[ -z "${NAGIOS_PASSWD}" ] && NAGIOS_PASSWD=nagios

  sudo dnf install -y nagios nagios-plugins-all

  # https://bugzilla.redhat.com/show_bug.cgi?id=1291718
  sudo mkdir /var/log/nagios/rw
  sudo chown nagios:nagios /var/log/nagios/rw
  sudo chmod 700 /var/log/nagios/rw

  # Apache2
  sudo htpasswd -db /etc/nagios/passwd "nagiosadmin" ${NAGIOS_PASSWD}
  sudo systemctl enable httpd
  sudo systemctl restart httpd
  sudo firewall-cmd --add-service=http --permanent
  sudo firewall-cmd --reload

  # https://bugzilla.redhat.com/show_bug.cgi?id=1291734
  cat <<EOF > my-nagios-socket.te
module my-nagios-socket 1.0;
require {
  type nagios_t;
  type nagios_log_t;
  class sock_file { write create unlink };
  class unix_stream_socket connectto;
allow nagios_t nagios_log_t:sock_file { write create unlink };
allow nagios_t self:unix_stream_socket connectto;
  checkmodule -M -m -o my-nagios-socket.mod my-nagios-socket.te
  semodule_package -m my-nagios-socket.mod -o my-nagios-socket.pp
  sudo semodule -i my-nagios-socket.pp
  rm -f my-nagios-socket.te my-nagios-socket.mod my-nagios-socket.pp

  # Fedora 26 needs other SELinux configuration.
  cat <<EOF > my-nagios.te
module my-nagios 1.0;
require {
  type nagios_t;
  type nagios_exec_t;
  class file execute_no_trans;
allow nagios_t nagios_exec_t:file execute_no_trans;
  checkmodule -M -m -o my-nagios.mod my-nagios.te
  semodule_package -m my-nagios.mod -o my-nagios.pp
  sudo semodule -i my-nagios.pp
  rm -f my-nagios.te my-nagios.mod my-nagios.pp

  cat <<EOF > my-nagios-script.te
module my-nagios-script 1.0;
require {
  type nagios_spool_t;
  type nagios_script_t;
  class file { open read getattr };
allow nagios_script_t nagios_spool_t:file { open read getattr };
  checkmodule -M -m -o my-nagios-script.mod my-nagios-script.te
  semodule_package -m my-nagios-script.mod -o my-nagios-script.pp
  sudo semodule -i my-nagios-script.pp
  rm -f my-nagios-script.te my-nagios-script.mod my-nagios-script.pp

  sudo systemctl enable nagios
  sudo systemctl restart nagios


Nagios configuration to Apache2 is written in the following file. You can change Nagios configuration like Digest authentication.


2 Access to Nagios

Access to Nagios via the following URL.


Input nagiosadmin user and NAGIOS_PASSWD.


Nagios is displayed.