Difference between revisions of "NaGIOS 4: UBUNTU 20.04 instalasi NaGIOS"

From OnnoWiki
Jump to navigation Jump to search
 
(13 intermediate revisions by the same user not shown)
Line 32: Line 32:
 
  cd /usr/local/src/
 
  cd /usr/local/src/
 
  wget -O nagioscore.tar.gz https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.6.tar.gz
 
  wget -O nagioscore.tar.gz https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.6.tar.gz
 
curl -L -O https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.4.tar.gz
 
 
  tar xzf nagioscore.tar.gz
 
  tar xzf nagioscore.tar.gz
  cd nagioscore-nagios-4.4.6
+
  cd /usr/local/src/nagioscore-nagios-4.4.6/
  
 
Run script & specify Apache config directory:
 
Run script & specify Apache config directory:
  
 +
sudo su
 +
cd /usr/local/src/nagioscore-nagios-4.4.6/
 +
sudo ./configure --with-httpd-conf=/etc/apache2/sites-enabled
  
cd /tmp/nagioscore-nagios-4.4.5/
 
sudo ./configure --with-httpd-conf=/etc/apache2/sites-enabled
 
sudo make all
 
  
 
Catatan: jika kita menggunakan email server postfix, ada baiknya di tambah --with-mail=/usr/sbin/sendmail
 
Catatan: jika kita menggunakan email server postfix, ada baiknya di tambah --with-mail=/usr/sbin/sendmail
 
You’ll see the following output from the configure command:
 
 
Output
 
*** Configuration summary for nagios 4.4.4 2019-07-29 ***:
 
 
General Options:
 
-------------------------
 
        Nagios executable:  nagios
 
        Nagios user/group:  nagios,nagios
 
      Command user/group:  nagios,nagios
 
            Event Broker:  yes
 
        Install ${prefix}:  /usr/local/nagios
 
    Install ${includedir}:  /usr/local/nagios/include/nagios
 
                Lock file:  /run/nagios.lock
 
  Check result directory:  /usr/local/nagios/var/spool/checkresults
 
          Init directory:  /lib/systemd/system
 
  Apache conf.d directory:  /etc/apache2/sites-enabled
 
            Mail program:  /bin/mail
 
                  Host OS:  linux-gnu
 
          IOBroker Method:  epoll
 
 
Web Interface Options:
 
------------------------
 
                HTML URL:  http://localhost/nagios/
 
                  CGI URL:  http://localhost/nagios/cgi-bin/
 
Traceroute (used by WAP):
 
 
 
Review the options above for accuracy.  If they look okay,
 
type 'make all' to compile the main program and CGIs.
 
  
 
Compile & install Nagios,
 
Compile & install Nagios,
  
  make all
+
  cd /usr/local/src/nagioscore-nagios-4.4.6/
 +
sudo make all
 
  sudo make install-groups-users
 
  sudo make install-groups-users
 
  sudo make install
 
  sudo make install
Line 93: Line 61:
 
  sudo usermod -a -G nagios www-data
 
  sudo usermod -a -G nagios www-data
  
Konfigurasi untuk user nagiosadmin (untuk user lain, nagiosadmin bisa di ganti)
+
Konfigurasi & masukan _PASSWORD_ untuk user nagiosadmin (untuk user lain, nagiosadmin bisa di ganti)
  
 
  sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
 
  sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Line 107: Line 75:
 
Kita perlu menginstalasi Nagios plugin, ada sekitar 50 plugin untuk memonitor berbagai hal seperti uptime, disk usage, swap usage, NTP dll. Download plugin,
 
Kita perlu menginstalasi Nagios plugin, ada sekitar 50 plugin untuk memonitor berbagai hal seperti uptime, disk usage, swap usage, NTP dll. Download plugin,
  
 +
sudo su
 
  cd /usr/local/src
 
  cd /usr/local/src
 
  curl -L -O https://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz
 
  curl -L -O https://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz
 
  tar zxf nagios-plugins-2.3.3.tar.gz
 
  tar zxf nagios-plugins-2.3.3.tar.gz
  cd nagios-plugins-2.3.3
+
  cd /usr/local/src/nagios-plugins-2.3.3
 +
 
  
 
Konfigurasi & instalasi:
 
Konfigurasi & instalasi:
  
 +
cd /usr/local/src/nagios-plugins-2.3.3
 
  ./configure
 
  ./configure
  make
+
  sudo make
 
  sudo make install
 
  sudo make install
  
Line 122: Line 93:
 
Nagios me-monitor remote host menggunakan Nagios Remote Plugin Executor (NRPE). NRPE terdiri dari dua bagian,
 
Nagios me-monitor remote host menggunakan Nagios Remote Plugin Executor (NRPE). NRPE terdiri dari dua bagian,
  
* check_nrpe plugin yang digunakan di Nagios server.
+
* check_nrpe plugin (di admin console) yang digunakan di Nagios server.
* NRPE daemon, yang di jalankan di remote host dan mengirimkan data ke Nagios server.
+
* NRPE daemon, di remote host dan mengirimkan data ke Nagios server.
 +
 
 +
Optional untuk mencari kesiapan libssl-dev
 +
 
 +
apt -y install apt-file
 +
apt-file update
 +
apt-file search libssl | grep libssl-dev
 +
apt-file search libssl | grep /usr/lib/x86_64-linux-gnu
 +
apt-file search ssl | grep /usr/bin/openssl
 +
 
 +
Install libssl-dev
 +
 
 +
apt -y install  libssl-dev
  
 
Download,
 
Download,
  
 +
sudo su
 
  cd /usr/local/src
 
  cd /usr/local/src
  curl -L -O https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-3.2.1/nrpe-3.2.1.tar.gz
+
  curl -L -O https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-4.0.3/nrpe-4.0.3.tar.gz
  tar zxf nrpe-3.2.1.tar.gz
+
  tar zxf nrpe-4.0.3.tar.gz
  cd nrpe-3.2.1
+
  cd /usr/local/src/nrpe-4.0.3
  
 
Konfigurasi dan install check_nrpe plugin:
 
Konfigurasi dan install check_nrpe plugin:
  
  ./configure
+
sudo su
  make check_nrpe
+
cd /usr/local/src/nrpe-4.0.3
 +
  ./configure --with-ssl=/usr/bin/openssl --with-ssl-lib=/usr/lib/x86_64-linux-gnu
 +
  sudo make check_nrpe
 
  sudo make install-plugin
 
  sudo make install-plugin
  
Line 146: Line 132:
 
  sudo vi /usr/local/nagios/etc/nagios.cfg
 
  sudo vi /usr/local/nagios/etc/nagios.cfg
  
Temukan,
+
Temukan di /usr/local/nagios/etc/nagios.cfg
/usr/local/nagios/etc/nagios.cfg
 
 
   
 
   
 
  ...
 
  ...
Line 159: Line 144:
 
Buat directory tersebut. Ini akan menyimpan file konfigurasi untuk setiap server yang kita monitor,
 
Buat directory tersebut. Ini akan menyimpan file konfigurasi untuk setiap server yang kita monitor,
  
  sudo mkdir -y /usr/local/nagios/etc/servers
+
  sudo mkdir -p /usr/local/nagios/etc/servers
  
 
'''Edit contact'''
 
'''Edit contact'''
Line 165: Line 150:
 
  sudo vi /usr/local/nagios/etc/objects/contacts.cfg
 
  sudo vi /usr/local/nagios/etc/objects/contacts.cfg
  
Ubah email dengan email kita,
+
Ubah email dengan email kita di /usr/local/nagios/etc/objects/contacts.cfg
 
 
/usr/local/nagios/etc/objects/contacts.cfg
 
  
 
  ...
 
  ...
Line 177: Line 160:
 
  ...
 
  ...
  
 +
 +
 +
 +
'''Edit commands.cfg''''
  
 
Untuk menambahkan new command ke konfigurasi Nagios.  
 
Untuk menambahkan new command ke konfigurasi Nagios.  
'''Edit commands.cfg''''
 
  
sudo vu /usr/local/nagios/etc/objects/commands.cfg
 
  
Tambahkan,
+
sudo vi /usr/local/nagios/etc/objects/commands.cfg
/usr/local/nagios/etc/objects/commands.cfg
+
 
 +
Tambahkan di /usr/local/nagios/etc/objects/commands.cfg
  
 
  ...
 
  ...
Line 196: Line 182:
 
  sudo systemctl start nagios
 
  sudo systemctl start nagios
  
==Step 5 — Accessing the Nagios Web Interface==
+
==Step 5 — Akses Nagios Web==
  
Open your favorite web browser, and go to your Nagios server by visiting http://nagios_server_public_ip/nagios.
+
Akses ke
  
Enter the login credentials for the web interface in the popup that appears. Use nagiosadmin for the username, and the password you created for that user.
+
http://nagios_server_public_ip/nagios.
  
After authenticating, you will see the default Nagios home page. Click on the Hosts link in the left navigation bar to see which hosts Nagios is monitoring:
+
username nagiosadmin
 +
password yangkitasetsebelumnya
  
Nagios Hosts Page
+
Untuk melihat host yang di monitor, kita bisa klik menu
  
As you can see, Nagios is monitoring only “localhost”, or itself.
+
  Current Status > Hosts
  
Let’s monitor our other server with Nagios,
+
Terlihat default Nagios hanya memonitor localhost
  
==Step 6 — Installing Nagios Plugins and NRPE Daemon on a Host==
+
==Step 6 — Installing Nagios Plugin & NRPE Daemon di Server yang di monitor==
  
Let’s add a new host so Nagios can monitor it. You’ll install the Nagios Remote Plugin Executor (NRPE) on the remote host, install some plugins, and then configure the Nagios server to monitor this host.
+
Untuk memonitor sebuah server, kita perlu menginstalasi Nagios Remote Plugin Executor (NRPE) di remote host tersebit, install plugin, dan konfigurasi Nagios server.
  
Log in to the second server, which we’ll call the second Ubuntu server:
+
Login server yang akan di monitor,
  
  ssh sammy@your_monitored_server_ip
+
  ssh onno@your_monitored_server_ip
  
First create a nagios user which will run the NRPE agent:
+
Buat user nagios yang akan menjalankan NRPE agent,
  
 
  sudo useradd nagios
 
  sudo useradd nagios
  
You’ll install NRPE from source, which means you’ll need the same development libraries you installed on the Nagios server in Step 1. Update your package sources and install the NRPE prerequisites:
+
Install aplikasi pendukung,
  
 
  sudo apt update
 
  sudo apt update
  sudo apt install autoconf gcc libmcrypt-dev make libssl-dev wget dc build-essential gettext
+
  sudo apt -y install autoconf gcc libmcrypt-dev make libssl-dev wget dc build-essential gettext
 
 
NRPE requires that Nagios Plugins is installed on the remote host. Let’s install this package from source.
 
  
Find the latest release of Nagios Plugins from the downloads page.
+
Download Nagios Plugins,
 
 
Download Nagios Plugins to your home directory with curl:
 
  
 +
sudo su
 
  cd /usr/local/src
 
  cd /usr/local/src
  curl -L -O https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
+
  curl -L -O https://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz
  tar zxf nagios-plugins-2.2.1.tar.gz
+
  tar zxf nagios-plugins-2.3.3.tar.gz
  cd nagios-plugins-2.2.1
+
  cd /usr/local/src/nagios-plugins-2.3.3
  
Before building Nagios Plugins, configure them with the following command:
+
Compile & install
  
 
  ./configure
 
  ./configure
  make
+
  sudo make
 
  sudo make install
 
  sudo make install
  
Next, install NRPE daemon. Find the download URL for the latest stable release of NRPE at the GitHub page just like you did in Step 3. Download the latest stable release of NRPE to your monitored server’s home directory with curl:
+
Install NRPE daemon,
  
 
  cd /usr/local/src
 
  cd /usr/local/src
  curl -L -O https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-3.2.1/nrpe-3.2.1.tar.gz
+
  curl -L -O https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-4.0.3/nrpe-4.0.3.tar.gz
  tar zxf nrpe-3.2.1.tar.gz
+
  tar zxf nrpe-4.0.3.tar.gz
  cd nrpe-3.2.1
+
  cd /usr/local/src/nrpe-4.0.3
  
 
Configure & Install NRPE:
 
Configure & Install NRPE:
  
 +
cd /usr/local/src/nrpe-4.0.3
 
  ./configure
 
  ./configure
  make nrpe
+
  sudo make nrpe
 
  sudo make install-daemon
 
  sudo make install-daemon
 
  sudo make install-config
 
  sudo make install-config
 
  sudo make install-init
 
  sudo make install-init
  
Now, let’s update the NRPE configuration file and add some basic checks that Nagios can monitor.
+
Untuk ujicoba kita akan monitor penggunan harddisk. Contoh,
 
 
First, let’s monitor the disk usage of this server. Use the df -h command to look for the root filesystem. You’ll use this filesystem name in the NRPE configuration:
 
  
 
  df -h /
 
  df -h /
  
You’ll see output similar to this:
+
Akan keluar,
  
Output
 
 
  Filesystem      Size  Used Avail Use% Mounted on
 
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/vda1       25G 1.4G   23G  6% /
+
  /dev/sda2       40G 5.0G   33G  14% /
  
Now open /usr/local/nagios/etc/nrpe.cfg file in your editor:
+
Edit /usr/local/nagios/etc/nrpe.cfg
  
  sudo nano /usr/local/nagios/etc/nrpe.cfg
+
  sudo vi /usr/local/nagios/etc/nrpe.cfg
  
The NRPE configuration file is very long and full of comments. There are a few lines that you will need to find and modify:
+
Kita perlu menembukan dan mengubah,
  
    server_address: Set to the private IP address of the monitored server.
+
server_address: Set to the private IP address of the monitored server.
    allowed_hosts: Add the private IP address of your Nagios server to the comma-delimited list.
+
allowed_hosts: Add the private IP address of your Nagios server to the comma-delimited list.
    command[check_hda1]: Change /dev/hda1 to whatever your root filesystem is called.
+
command[check_hda1]: Change /dev/hda1 to whatever your root filesystem is called.
  
 
Locate these settings and alter them appropriately:
 
Locate these settings and alter them appropriately:
 +
 +
 
  /usr/local/nagios/etc/nrpe.cfg
 
  /usr/local/nagios/etc/nrpe.cfg
  
Line 289: Line 273:
 
  allowed_hosts=127.0.0.1,::1,your_nagios_server_private_ip
 
  allowed_hosts=127.0.0.1,::1,your_nagios_server_private_ip
 
  ...
 
  ...
  command[check_vda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/vda1
+
  command[check_sda2]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/sda2
 
  ...
 
  ...
  
Save and exit the editor. Now you can start NRPE:
+
Start NRPE,
  
 
  sudo systemctl start nrpe.service
 
  sudo systemctl start nrpe.service
  
Ensure that the service is running by checking its status:
+
Pastikan running,
  
 
  sudo systemctl status nrpe.service
 
  sudo systemctl status nrpe.service
  
You’ll see the following output:
+
output kira2,
  
Output
 
 
  ...
 
  ...
 
  Aug 01 06:28:31 client systemd[1]: Started Nagios Remote Plugin Executor.
 
  Aug 01 06:28:31 client systemd[1]: Started Nagios Remote Plugin Executor.
Line 311: Line 294:
 
  Aug 01 06:28:31 client nrpe[8021]: Allowing connections from: 127.0.0.1,::1,165.22.212.38
 
  Aug 01 06:28:31 client nrpe[8021]: Allowing connections from: 127.0.0.1,::1,165.22.212.38
  
Next, allow access to port 5666 through the firewall. If you are using UFW, configure it to allow TCP connections to port 5666 with the following command:
+
Buka port 5666 di firewall,
  
 
  sudo ufw allow 5666/tcp
 
  sudo ufw allow 5666/tcp
  
You can learn more about UFW in How To Set Up a Firewall with UFW on Ubuntu 18.04.
+
Cek komunikasi ke remote NRPE server dari Admin Console (Nagios Server),
 
 
Now you can check the communication with the remote NRPE server. Run the following command on the Nagios server:
 
  
 
  /usr/local/nagios/libexec/check_nrpe -H second_ubuntu_server_ip
 
  /usr/local/nagios/libexec/check_nrpe -H second_ubuntu_server_ip
  
You’ll see the following output:
+
Output,
  
Output
+
  NRPE v4.0.3
  NRPE v3.2.1
 
  
Repeat the steps in this section for each additional server you want to monitor.
+
==Step 7 — Monitoring Hosts dengan Nagios==
  
Once you are done installing and configuring NRPE on the hosts that you want to monitor, you will have to add these hosts to your Nagios server configuration before it will start monitoring them. Let’s do that next.
+
Tambahkan host yang akan di monitor Nagios, edit
==Step 7 — Monitoring Hosts with Nagios==
 
  
To monitor your hosts with Nagios, you’ll add configuration files for each host specifying what you want to monitor. You can then view those hosts in the Nagios web interface.
+
sudo vi /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
 +
sudo vi /usr/local/nagios/etc/servers/192.168.0.155.cfg
  
On your Nagios server, create a new configuration file for each of the remote hosts that you want to monitor in /usr/local/nagios/etc/servers/. Replace the highlighted word, monitored_server_host_name with the name of your host:
+
Edit file /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
 
 
sudo nano /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
 
 
 
Add the following host definition, replacing the host_name value with your remote hostname, the alias value with a description of the host, and the address value with the private IP address of the remote host:
 
/usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
 
  
 
  define host {
 
  define host {
Line 351: Line 326:
 
  }
 
  }
  
With this configuration, Nagios will only tell you if the host is up or down. Let’s add some services to monitor.
+
Tambahkan service yang di monitor
  
First, add this block to monitor load average:
+
sudo vi /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
 
+
  sudo vi /usr/local/nagios/etc/servers/192.168.0.155.cfg
  /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
 
  
 
  define service {
 
  define service {
Line 364: Line 338:
 
  }
 
  }
  
The use generic-service directive tells Nagios to inherit the values of a service template called generic-service, which is predefined by Nagios.
+
Cek Disk
  
Next, add this block to monitor disk usage:
+
sudo vi /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
  /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
+
  sudo vi /usr/local/nagios/etc/servers/192.168.0.155.cfg
  
 
  define service {
 
  define service {
 
         use                            generic-service
 
         use                            generic-service
 
         host_name                      your_monitored_server_host_name
 
         host_name                      your_monitored_server_host_name
         service_description            /dev/vda1 free space
+
         service_description            /dev/sda2 free space
         check_command                  check_nrpe!check_vda1
+
         check_command                  check_nrpe!check_sda2
 
  }
 
  }
  
Now save and quit. Restart the Nagios service to put any changes into effect:
 
  
sudo systemctl restart nagios
+
Save & Quit.
 
 
After several minutes, Nagios will check the new hosts and you’ll see them in the Nagios web interface. Click on the Services link in the left navigation bar to see all of your monitored hosts and services.
 
 
 
Nagios Services Page
 
 
 
==Conclusion==
 
 
 
You’ve installed Nagios on a server and configured it to monitor load average and disk usage of at least one remote machine.
 
 
 
Now that you’re monitoring a host and some of its services, you can start using Nagios to monitor your mission-critical services. You can use Nagios to set up notifications for critical events. For example, you can receive an email when your disk utilization reaches a warning or critical threshold, or a notification when your main website is down. This way you can resolve the situation promptly, or even before a problem occurs.
 
  
 +
Restart,
  
 +
sudo systemctl restart nagios
  
  
 +
Tunggu beberapa menit, cek kembali ke Nagios Web.
  
 
==Referensi==
 
==Referensi==

Latest revision as of 12:38, 18 May 2020

Sumber: https://www.digitalocean.com/community/tutorials/how-to-install-nagios-4-and-monitor-your-servers-on-ubuntu-18-04


Nagios adalah sistem pemantauan open-source yang populer. Nagios menjaga inventory server anda dan memonitor mereka sehingga anda tahu layanan penting anda sudah up dan running. Menggunakan sistem pemantauan seperti Nagios adalah tool penting untuk lingkungan produksi apa pun, karena dengan memantau waktu kerja, penggunaan CPU, atau disk space, anda dapat mencegah masalah sebelum terjadi, atau sebelum pengguna anda menghubungi anda.

Disini kita akan menginstalasi Nagios 4 dan mengkonfigurasinya agar kita dapat memonitor resource host di interface web Nagios. Kita juga akan mensetup Nagios Remote Plugin Executor (NRPE), yang akan berjalan sebagai agent remote host sehingga kita dapat memonitor resource-nya.


Kebutuhan

  • Dua Ubuntu 20.04 server dengan user root privige. Firewall dengan ufw.
    • Server dengan Nagios akan di sebut Nagios server.
    • Server tanpa Nagios akan di sebut Ubuntu server.
  • Nagios Server akan menjalakan Apache dan PHP.

Nagios Server biasanya di jalankan di belakang Firewall atau VPN. Jika di jalankan di IP Public anda harus lebih serius menginstalasi TLS/SSL dll. Tutorial ini berasumsi, Nagios server di belakang Firewall.

Step 1 — Installing Nagios 4

Login ke Nagios server,

   ssh username@your_nagios_server_ip

Instalasi aplikasi pendukung,

sudo apt update
sudo apt -y install autoconf gcc libc6 make wget unzip apache2 php libapache2-mod-php libgd-dev
# sudo apt -y install autoconf gcc make unzip libgd-dev libmcrypt-dev libssl-dev dc snmp libnet-snmp-perl gettext

Download source code terakhir Nagios (misalnya),

cd /usr/local/src/
wget -O nagioscore.tar.gz https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.6.tar.gz
tar xzf nagioscore.tar.gz
cd /usr/local/src/nagioscore-nagios-4.4.6/

Run script & specify Apache config directory:

sudo su
cd /usr/local/src/nagioscore-nagios-4.4.6/
sudo ./configure --with-httpd-conf=/etc/apache2/sites-enabled


Catatan: jika kita menggunakan email server postfix, ada baiknya di tambah --with-mail=/usr/sbin/sendmail

Compile & install Nagios,

cd /usr/local/src/nagioscore-nagios-4.4.6/
sudo make all
sudo make install-groups-users
sudo make install
sudo make install-daemoninit
sudo make install-commandmode
sudo make install-config

Konfigurasi apache

sudo make install-webconf
sudo a2enmod rewrite
sudo a2enmod cgi
sudo usermod -a -G nagios www-data

Konfigurasi & masukan _PASSWORD_ untuk user nagiosadmin (untuk user lain, nagiosadmin bisa di ganti)

sudo htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

Catatan: edit /usr/local/nagios/etc/cgi.cfg ubah nagiosadmin ke useranda jika tidak menggunakan nagiosadmin.

Restart Apache,

sudo systemctl restart apache2

Step 2 — Installing Nagios Plugins

Kita perlu menginstalasi Nagios plugin, ada sekitar 50 plugin untuk memonitor berbagai hal seperti uptime, disk usage, swap usage, NTP dll. Download plugin,

sudo su
cd /usr/local/src
curl -L -O https://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz
tar zxf nagios-plugins-2.3.3.tar.gz
cd /usr/local/src/nagios-plugins-2.3.3


Konfigurasi & instalasi:

cd /usr/local/src/nagios-plugins-2.3.3
./configure
sudo make
sudo make install

Step 3 — Installing the check_nrpe Plugin

Nagios me-monitor remote host menggunakan Nagios Remote Plugin Executor (NRPE). NRPE terdiri dari dua bagian,

  • check_nrpe plugin (di admin console) yang digunakan di Nagios server.
  • NRPE daemon, di remote host dan mengirimkan data ke Nagios server.

Optional untuk mencari kesiapan libssl-dev

apt -y install apt-file
apt-file update
apt-file search libssl | grep libssl-dev
apt-file search libssl | grep /usr/lib/x86_64-linux-gnu
apt-file search ssl | grep /usr/bin/openssl

Install libssl-dev

apt -y install  libssl-dev

Download,

sudo su
cd /usr/local/src
curl -L -O https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-4.0.3/nrpe-4.0.3.tar.gz
tar zxf nrpe-4.0.3.tar.gz
cd /usr/local/src/nrpe-4.0.3

Konfigurasi dan install check_nrpe plugin:

sudo su
cd /usr/local/src/nrpe-4.0.3
./configure --with-ssl=/usr/bin/openssl --with-ssl-lib=/usr/lib/x86_64-linux-gnu
sudo make check_nrpe
sudo make install-plugin

Step 4 — Konfigurasi Nagios server

Konfigurasi awal Nagios, meliputi proses editing beberapa file konfigurasi. Kita hanya perlu melakukannya satu kali di Nagios server.

Edit nagios.cfg

sudo vi /usr/local/nagios/etc/nagios.cfg

Temukan di /usr/local/nagios/etc/nagios.cfg

...
#cfg_dir=/usr/local/nagios/etc/servers
...

Buang # di depan cfg_dir, menjadi

cfg_dir=/usr/local/nagios/etc/servers

Buat directory tersebut. Ini akan menyimpan file konfigurasi untuk setiap server yang kita monitor,

sudo mkdir -p /usr/local/nagios/etc/servers

Edit contact

sudo vi /usr/local/nagios/etc/objects/contacts.cfg

Ubah email dengan email kita di /usr/local/nagios/etc/objects/contacts.cfg

...
define contact{
       contact_name nagiosadmin     ; Short name of user
       use          generic-contact ; Inherit default values from generic-contact template (defined above)
       alias        Nagios Admin    ; Full name of user
       email        your_email@your_domain.com  ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
...



Edit commands.cfg'

Untuk menambahkan new command ke konfigurasi Nagios.


sudo vi /usr/local/nagios/etc/objects/commands.cfg

Tambahkan di /usr/local/nagios/etc/objects/commands.cfg

...
define command{
        command_name check_nrpe
        command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}

Restart Nagios

sudo systemctl start nagios

Step 5 — Akses Nagios Web

Akses ke

http://nagios_server_public_ip/nagios.
username nagiosadmin
password yangkitasetsebelumnya

Untuk melihat host yang di monitor, kita bisa klik menu

 Current Status > Hosts

Terlihat default Nagios hanya memonitor localhost

Step 6 — Installing Nagios Plugin & NRPE Daemon di Server yang di monitor

Untuk memonitor sebuah server, kita perlu menginstalasi Nagios Remote Plugin Executor (NRPE) di remote host tersebit, install plugin, dan konfigurasi Nagios server.

Login server yang akan di monitor,

ssh onno@your_monitored_server_ip

Buat user nagios yang akan menjalankan NRPE agent,

sudo useradd nagios

Install aplikasi pendukung,

sudo apt update
sudo apt -y install autoconf gcc libmcrypt-dev make libssl-dev wget dc build-essential gettext

Download Nagios Plugins,

sudo su
cd /usr/local/src
curl -L -O https://nagios-plugins.org/download/nagios-plugins-2.3.3.tar.gz
tar zxf nagios-plugins-2.3.3.tar.gz
cd /usr/local/src/nagios-plugins-2.3.3

Compile & install

./configure
sudo make
sudo make install

Install NRPE daemon,

cd /usr/local/src
curl -L -O https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-4.0.3/nrpe-4.0.3.tar.gz
tar zxf nrpe-4.0.3.tar.gz
cd /usr/local/src/nrpe-4.0.3

Configure & Install NRPE:

cd /usr/local/src/nrpe-4.0.3
./configure
sudo make nrpe
sudo make install-daemon
sudo make install-config
sudo make install-init

Untuk ujicoba kita akan monitor penggunan harddisk. Contoh,

df -h /

Akan keluar,

Filesystem      Size  Used Avail Use% Mounted on
/dev/sda2        40G  5.0G   33G  14% /

Edit /usr/local/nagios/etc/nrpe.cfg

sudo vi /usr/local/nagios/etc/nrpe.cfg

Kita perlu menembukan dan mengubah,

server_address: Set to the private IP address of the monitored server.
allowed_hosts: Add the private IP address of your Nagios server to the comma-delimited list.
command[check_hda1]: Change /dev/hda1 to whatever your root filesystem is called.

Locate these settings and alter them appropriately:


/usr/local/nagios/etc/nrpe.cfg
...
server_address=second_ubuntu_server_private_ip
...
allowed_hosts=127.0.0.1,::1,your_nagios_server_private_ip
...
command[check_sda2]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/sda2
...

Start NRPE,

sudo systemctl start nrpe.service

Pastikan running,

sudo systemctl status nrpe.service

output kira2,

...
Aug 01 06:28:31 client systemd[1]: Started Nagios Remote Plugin Executor.
Aug 01 06:28:31 client nrpe[8021]: Starting up daemon
Aug 01 06:28:31 client nrpe[8021]: Server listening on 0.0.0.0 port 5666.
Aug 01 06:28:31 client nrpe[8021]: Server listening on :: port 5666.
Aug 01 06:28:31 client nrpe[8021]: Listening for connections on port 5666
Aug 01 06:28:31 client nrpe[8021]: Allowing connections from: 127.0.0.1,::1,165.22.212.38

Buka port 5666 di firewall,

sudo ufw allow 5666/tcp

Cek komunikasi ke remote NRPE server dari Admin Console (Nagios Server),

/usr/local/nagios/libexec/check_nrpe -H second_ubuntu_server_ip

Output,

NRPE v4.0.3

Step 7 — Monitoring Hosts dengan Nagios

Tambahkan host yang akan di monitor Nagios, edit

sudo vi /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
sudo vi /usr/local/nagios/etc/servers/192.168.0.155.cfg

Edit file /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg

define host {
        use                             linux-server
        host_name                       your_monitored_server_host_name
        alias                           My client server
        address                         your_monitored_server_private_ip
        max_check_attempts              5
        check_period                    24x7
        notification_interval           30
        notification_period             24x7
}

Tambahkan service yang di monitor

sudo vi /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
sudo vi /usr/local/nagios/etc/servers/192.168.0.155.cfg
define service {
        use                             generic-service
        host_name                       your_monitored_server_host_name
        service_description             Load average
        check_command                   check_nrpe!check_load
}

Cek Disk

sudo vi /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
sudo vi /usr/local/nagios/etc/servers/192.168.0.155.cfg
define service {
        use                             generic-service
        host_name                       your_monitored_server_host_name
        service_description             /dev/sda2 free space
        check_command                   check_nrpe!check_sda2
}


Save & Quit.

Restart,

sudo systemctl restart nagios


Tunggu beberapa menit, cek kembali ke Nagios Web.

Referensi


Pranala Menarik