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Faruque Ahmed : MCP, MCSA, MCSE, MCTS, MCIT, CCNA, OCA, OCP, GCP
https://support.nagios.com/kb/article.php?id=515#RHEL
NRPE - How To Install NRPE v3 From Source
RHEL | CentOS | Oracle Linux
Prerequisites
Prerequisites
Make sure that you have the following packages installed.
yum install -y gcc glibc glibc-common openssl-devel perl wget
Downloading the Source
Downloading the Source
cd /tmp
wget --no-check-certificate -O nrpe.tar.gz https://github.com/NagiosEnterprises/nrpe/archive/nrpe-3.2.0.tar.gz
tar xzf nrpe.tar.gz
Compile
Compile
Note that if you want to pass arguments through NRPE you must specify this in the configuration option as indicated below. If you prefer to you can omit the --enable-command-args flag. Removing this flag will require that all arguments be explicitly set in the nrpe.cfg file on each server monitored.
cd /tmp/nrpe-nrpe-3.2.0/
./configure --enable-command-args
make all
Create User And Group
Create User And Group
This creates the nagios user and group.
make install-groups-users
Install Binaries
Install Binaries
This step installs the binary files, the NRPE daemon and the check_nrpe plugin.
If you only wanted to install the daemon, run the command make install-daemon instead of the command below. However it is useful having the check_nrpe plugin installed for testing purposes.
If you only wanted to install the check_nrpe plugin, refer to the section at the bottom of this KB article as there a lot of steps that can be skipped. Installing only the plugin is usually done on your Nagios server and workers.
make install
Install Configuration Files
Install Configuration Files
This installs the config files.
make install-config
Update Services File
Update Services File
The /etc/services file is used by applications to translate human readable service names into port numbers when connecting to a machine across a network.
echo >> /etc/services
echo '# Nagios services' >> /etc/services
echo 'nrpe 5666/tcp' >> /etc/services
Install Service / Daemon
Install Service / Daemon
This installs the service or daemon files.
CentOS 5.x / 6.x | RHEL 5.x / 6.x | Oracle Linux 5.x / 6.x
make install-init
CentOS 7.x | RHEL 7.x | Oracle Linux 7.x | Fedora 23
make install-init
systemctl enable nrpe.service
Information on starting and stopping services will be explained further on.
Configure Firewall
Configure Firewall
Port 5666 is used by NRPE and needs to be opened on the local firewall.
CentOS 5.x / 6.x | RHEL 5.x / 6.x | Oracle Linux 5.x / 6.x
iptables -I INPUT -p tcp --destination-port 5666 -j ACCEPT
service iptables save
CentOS 7.x | RHEL 7.x | Oracle Linux 7.x
firewall-cmd --zone=public --add-port=5666/tcp
firewall-cmd --zone=public --add-port=5666/tcp --permanent
Update Configuration File
Update Configuration File
The file nrpe.cfg is where the following settings will be defined. It is located:
/usr/local/nagios/etc/nrpe.cfg
allowed_hosts=
At this point NRPE will only listen to requests from itself (127.0.0.1). If you wanted your nagios server to be able to connect, add it's IP address after a comma (in this example it's 10.25.5.2):
allowed_hosts=127.0.0.1,10.25.5.2
dont_blame_nrpe=
This option determines whether or not the NRPE daemon will allow clients to specify arguments to commands that are executed. We are going to allow this, as it enables more advanced NPRE configurations.
dont_blame_nrpe=1
The following commands make the configuration changes described above.
sed -i '/^allowed_hosts=/s/$/,10.25.5.2/' /usr/local/nagios/etc/nrpe.cfg
sed -i 's/^dont_blame_nrpe=.*/dont_blame_nrpe=1/g' /usr/local/nagios/etc/nrpe.cfg
Start Service / Daemon
Start Service / Daemon
Different Linux distributions have different methods of starting NRPE.
CentOS 5.x | RHEL 5.x | Oracle Linux 5.x
service nrpe start
CentOS 6.x | RHEL 6.x | Oracle Linux 6.x
start nrpe
CentOS 7.x | RHEL 7.x | Oracle Linux 7.x
systemctl start nrpe.service
Test NRPE
Test NRPE
Now check that NRPE is listening and responding to requests.
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1
You should see the output similar to the following:
NRPE v3.2.0
If you get the NRPE version number (as shown above), NRPE is installed and configured correctly.
You can also test from your Nagios host by executing the same command above, but instead of 127.0.0.1 you will need to replace that with the IP Address / DNS name of the machine with NRPE running.
Service / Daemon Commands
Service / Daemon Commands
Different Linux distributions have different methods of starting / stopping / restarting / status NRPE.
CentOS 5.x | RHEL 5.x | Oracle Linux 5.x
service nrpe start
service nrpe stop
service nrpe restart
service nrpe status
CentOS 6.x | RHEL 6.x | Oracle Linux 6.x
start nrpe
stop nrpe
restart nrpe
status nrpe
CentOS 7.x | RHEL 7.x | Oracle Linux 7.x
systemctl start nrpe.service
systemctl stop nrpe.service
systemctl restart nrpe.service
systemctl status nrpe.service
Installing The Nagios Plugins
Installing The Nagios Plugins
NRPE needs plugins to operate properly. The following steps will walk you through installing Nagios Plugins.
These steps install nagios-plugins 2.2.1. Newer versions will become available in the future and you can use those in the following installation steps. Please see the releases page on GitHub for all available versions.
Please note that the following steps install most of the plugins that come in the Nagios Plugins package. However there are some plugins that require other libraries which are not included in those instructions. Please refer to the following KB article for detailed installation instructions:
Documentation - Installing Nagios Plugins From Source
Prerequisites
Prerequisites
Make sure that you have the following packages installed.
CentOS 5.x
yum install -y gcc glibc glibc-common make gettext automake wget openssl-devel net-snmp net-snmp-utils epel-release
yum install -y perl-Net-SNMP
cd /tmp
wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.60.tar.gz
tar xzf autoconf-2.60.tar.gz
cd /tmp/autoconf-2.60
./configure
make
make install
CentOS 6.x / 7.x
yum install -y gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils epel-release
yum install -y perl-Net-SNMP
RHEL 5.x | Oracle Linux 5.x
cd /tmp
wget http://archives.fedoraproject.org/pub/archive/epel/epel-release-latest-5.noarch.rpm
rpm -ihv epel-release-latest-5.noarch.rpm
yum install -y gcc glibc glibc-common make gettext automake wget openssl-devel net-snmp net-snmp-utils
yum install -y perl-Net-SNMP
wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.60.tar.gz
tar xzf autoconf-2.60.tar.gz
cd /tmp/autoconf-2.60
./configure
make
make install
RHEL 6.x | Oracle Linux 6.x
cd /tmp
wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
rpm -ihv epel-release-latest-6.noarch.rpm
yum install -y gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils
yum install -y perl-Net-SNMP
RHEL 7.x
cd /tmp
wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -ihv epel-release-latest-7.noarch.rpm
subscription-manager repos --enable=rhel-7-server-optional-rpms
yum install -y gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils
yum install -y perl-Net-SNMP
Oracle Linux 7.x
yum install -y yum-utils
yum-config-manager --enable ol7_optional_latest
cd /tmp
wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -ihv epel-release-latest-7.noarch.rpm
yum install -y gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils
yum install -y perl-Net-SNMP
Downloading the Source
Downloading the Source
cd /tmp
wget --no-check-certificate -O nagios-plugins.tar.gz https://github.com/nagios-plugins/nagios-plugins/archive/release-2.2.1.tar.gz
tar zxf nagios-plugins.tar.gz
Compile + Install
Compile + Install
cd /tmp/nagios-plugins-release-2.2.1/
./tools/setup
./configure
make
make install
Test NRPE + Plugins
Test NRPE + Plugins
Now you can check that NRPE is executing plugins correctly. The default configuration file /usr/local/nagios/etc/nrpe.cfg has the following command defined in it:
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
Using the check_load command to test NRPE:
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 -c check_load
You should see the output similar to the following:
OK - load average: 0.01, 0.13, 0.12|load1=0.010;15.000;30.000;0; load5=0.130;10.000;25.000;0; load15=0.120;5.000;20.000;0;
You can also test from your Nagios host by executing the same command above, but instead of 127.0.0.1 you will need to replace that with the IP Address / DNS name of the machine with NRPE running.
Ubuntu
Prerequisites
Prerequisites
Make sure that you have the following packages installed.
sudo apt-get update
sudo apt-get install -y autoconf gcc libc6 libmcrypt-dev make libssl-dev wget
Downloading the Source
Downloading the Source
cd /tmp
wget --no-check-certificate -O nrpe.tar.gz https://github.com/NagiosEnterprises/nrpe/archive/nrpe-3.2.0.tar.gz
tar xzf nrpe.tar.gz
Compile
Compile
Note that if you want to pass arguments through NRPE you must specify this in the configuration option as indicated below. If you prefer to you can omit the --enable-command-args flag. Removing this flag will require that all arguments be explicitly set in the nrpe.cfg file on each server monitored.
Ubuntu i386
cd /tmp/nrpe-nrpe-3.2.0/
sudo ./configure --enable-command-args --with-ssl-lib=/usr/lib/i386-linux-gnu/
sudo make all
Ubuntu x86_x64
cd /tmp/nrpe-nrpe-3.2.0/
sudo ./configure --enable-command-args --with-ssl-lib=/usr/lib/x86_64-linux-gnu/
sudo make all
Create User And Group
Create User And Group
This creates the nagios user and group.
sudo make install-groups-users
Install Binaries
Install Binaries
This step installs the binary files, the NRPE daemon and the check_nrpe plugin.
If you only wanted to install the daemon, run the command make install-daemon instead of the command below. However it is useful having the check_nrpe plugin installed for testing purposes.
If you only wanted to install the check_nrpe plugin, refer to the section at the bottom of this KB article as there a lot of steps that can be skipped. Installing only the plugin is usually done on your Nagios server and workers.
sudo make install
Install Configuration Files
Install Configuration Files
This installs the config files.
sudo make install-config
Update Services File
Update Services File
The /etc/services file is used by applications to translate human readable service names into port numbers when connecting to a machine across a network.
sudo sh -c "echo >> /etc/services"
sudo sh -c "sudo echo '# Nagios services' >> /etc/services"
sudo sh -c "sudo echo 'nrpe 5666/tcp' >> /etc/services"
Install Service / Daemon
Install Service / Daemon
This installs the service or daemon files.
Ubuntu 13.x / 14.x
sudo make install-init
Ubuntu 15.x / 16.x / 17.x
sudo make install-init
sudo systemctl enable nrpe.service
Information on starting and stopping services will be explained further on.
Configure Firewall
Configure Firewall
Port 5666 is used by NRPE and needs to be opened on the local firewall.
sudo mkdir -p /etc/ufw/applications.d
sudo sh -c "echo '[NRPE]' > /etc/ufw/applications.d/nagios"
sudo sh -c "echo 'title=Nagios Remote Plugin Executor' >> /etc/ufw/applications.d/nagios"
sudo sh -c "echo 'description=Allows remote execution of Nagios plugins' >> /etc/ufw/applications.d/nagios"
sudo sh -c "echo 'ports=5666/tcp' >> /etc/ufw/applications.d/nagios"
sudo ufw allow NRPE
sudo ufw reload
Update Configuration File
Update Configuration File
The file nrpe.cfg is where the following settings will be defined. It is located:
/usr/local/nagios/etc/nrpe.cfg
allowed_hosts=
At this point NRPE will only listen to requests from itself (127.0.0.1). If you wanted your nagios server to be able to connect, add it's IP address after a comma (in this example it's 10.25.5.2):
allowed_hosts=127.0.0.1,10.25.5.2
dont_blame_nrpe=
This option determines whether or not the NRPE daemon will allow clients to specify arguments to commands that are executed. We are going to allow this, as it enables more advanced NPRE configurations.
dont_blame_nrpe=1
The following commands make the configuration changes described above.
sudo sh -c "sed -i '/^allowed_hosts=/s/$/,10.25.5.2/' /usr/local/nagios/etc/nrpe.cfg"
sudo sh -c "sed -i 's/^dont_blame_nrpe=.*/dont_blame_nrpe=1/g' /usr/local/nagios/etc/nrpe.cfg"
Start Service / Daemon
Start Service / Daemon
Different Linux distributions have different methods of starting NRPE.
Ubuntu 13.x / 14.x
sudo start nrpe
Ubuntu 15.x / 16.x / 17.x
sudo systemctl start nrpe.service
Test NRPE
Test NRPE
Now check that NRPE is listening and responding to requests.
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1
You should see the output similar to the following:
NRPE v3.2.0
If you get the NRPE version number (as shown above), NRPE is installed and configured correctly.
You can also test from your Nagios host by executing the same command above, but instead of 127.0.0.1 you will need to replace that with the IP Address / DNS name of the machine with NRPE running.
Service / Daemon Commands
Service / Daemon Commands
Different Linux distributions have different methods of starting / stopping / restarting / status NRPE.
Ubuntu 13.x / 14.x
sudo start nrpe
sudo stop nrpe
sudo restart nrpe
sudo status nrpe
Ubuntu 15.x / 16.x / 17.x
sudo systemctl start nrpe.service
sudo systemctl stop nrpe.service
sudo systemctl restart nrpe.service
sudo systemctl status nrpe.service
Installing The Nagios Plugins
Installing The Nagios Plugins
NRPE needs plugins to operate properly. The following steps will walk you through installing Nagios Plugins.
These steps install nagios-plugins 2.2.1. Newer versions will become available in the future and you can use those in the following installation steps. Please see the releases page on GitHub for all available versions.
Please note that the following steps install most of the plugins that come in the Nagios Plugins package. However there are some plugins that require other libraries which are not included in those instructions. Please refer to the following KB article for detailed installation instructions:
Documentation - Installing Nagios Plugins From Source
Prerequisites
Prerequisites
Make sure that you have the following packages installed.
sudo apt-get install -y autoconf gcc libc6 libmcrypt-dev make libssl-dev wget bc gawk dc build-essential snmp libnet-snmp-perl gettext
Downloading the Source
Downloading the Source
cd /tmp
wget --no-check-certificate -O nagios-plugins.tar.gz https://github.com/nagios-plugins/nagios-plugins/archive/release-2.2.1.tar.gz
tar zxf nagios-plugins.tar.gz
Compile + Install
Compile + Install
cd /tmp/nagios-plugins-release-2.2.1/
sudo ./tools/setup
sudo ./configure
sudo make
sudo make install
Test NRPE + Plugins
Test NRPE + Plugins
Now you can check that NRPE is executing plugins correctly. The default configuration file /usr/local/nagios/etc/nrpe.cfg has the following command defined in it:
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
Using the check_load command to test NRPE:
/usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 -c check_load
You should see the output similar to the following:
OK - load average: 0.01, 0.13, 0.12|load1=0.010;15.000;30.000;0; load5=0.130;10.000;25.000;0; load15=0.120;5.000;20.000;0;
You can also test from your Nagios host by executing the same command above, but instead of 127.0.0.1 you will need to replace that with the IP Address / DNS name of the machine with NRPE running.
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