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

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Line 7: Line 7:
  
  
−
==Prerequisit==
+
==Kebutuhan==
  
 
* Dua Ubuntu 20.04 server dengan user root privige. Firewall dengan ufw.
 
* Dua Ubuntu 20.04 server dengan user root privige. Firewall dengan ufw.
Line 20: Line 20:
 
Login ke Nagios server,
 
Login ke Nagios server,
  
−
     ssh sammy@your_nagios_server_ip
+
     ssh username@your_nagios_server_ip
  
 
Instalasi aplikasi pendukung,
 
Instalasi aplikasi pendukung,
  
 
  sudo apt update
 
  sudo apt update
−
  sudo apt -y install autoconf gcc libc6 make wget unzip apache2 php libapache2-mod-php7.2 libgd-dev
+
  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
 
  # 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),
 
Download source code terakhir Nagios (misalnya),
  
−
    cd /usr/local/src/
+
cd /usr/local/src/
−
    curl -L -O https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.4.tar.gz
+
wget -O nagioscore.tar.gz https://github.com/NagiosEnterprises/nagioscore/archive/nagios-4.4.6.tar.gz
−
    tar zxf nagios-4.4.4.tar.gz
+
tar xzf nagioscore.tar.gz
−
    cd nagioscore-nagios-4.4.4
+
cd /usr/local/src/nagioscore-nagios-4.4.6/
  
−
Before building Nagios, run the configure script and specify the Apache configs directory:
+
Run script & specify Apache config directory:
  
−
    ./configure --with-httpd-conf=/etc/apache2/sites-enabled
+
sudo su
 +
cd /usr/local/src/nagioscore-nagios-4.4.6/
 +
sudo ./configure --with-httpd-conf=/etc/apache2/sites-enabled
  
−
Note: If you want Nagios to send emails using Postfix, you must install Postfix and configure Nagios to use it by adding --with-mail=/usr/sbin/sendmail to the configure command. We won’t cover Postfix in this tutorial, but if you choose to use Postfix and Nagios later, you’ll need to reconfigure and reinstall Nagios to use Postfix support.
 
  
−
You’ll see the following output from the configure command:
+
Catatan: jika kita menggunakan email server postfix, ada baiknya di tambah --with-mail=/usr/sbin/sendmail
  
−
Output
+
Compile & install Nagios,
−
*** 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.
 
−
 
 
−
Now compile Nagios with this command:
 
−
 
 
−
make all
 
−
 
 
−
Next create a nagios user and nagios group. They will be used to run the Nagios process:
 
  
 +
cd /usr/local/src/nagioscore-nagios-4.4.6/
 +
sudo make all
 
  sudo make install-groups-users
 
  sudo make install-groups-users
−
 
−
Now run these make commands to install Nagios binary files, service files, and its sample configuration files:
 
−
 
 
  sudo make install
 
  sudo make install
 
  sudo make install-daemoninit
 
  sudo make install-daemoninit
Line 87: Line 54:
 
  sudo make install-config
 
  sudo make install-config
  
−
You’ll use Apache to serve Nagios’ web interface, so run the following to install the Apache configuration files and configure its settings:
+
Konfigurasi apache
  
 
  sudo make install-webconf
 
  sudo make install-webconf
−
 
−
Enable the Apache rewrite and cgi modules with the a2enmod command:
 
−
 
 
  sudo a2enmod rewrite
 
  sudo a2enmod rewrite
 
  sudo a2enmod cgi
 
  sudo a2enmod cgi
−
 
−
In order to issue external commands via the web interface to Nagios, add the web server user, www-data, to the nagios group:
 
−
 
 
  sudo usermod -a -G nagios www-data
 
  sudo usermod -a -G nagios www-data
  
−
Use the htpasswd command to create an admin user called nagiosadmin that can access the Nagios web interface:
+
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
  
−
Enter a password at the prompt. Remember this password, as you will need it to access the Nagios web interface.
+
Catatan: edit /usr/local/nagios/etc/cgi.cfg ubah nagiosadmin ke useranda jika tidak menggunakan nagiosadmin.
  
−
Warning: If you create a user with a name other than nagiosadmin, you will need to edit /usr/local/nagios/etc/cgi.cfg and change all the nagiosadmin references to the user you created.
+
Restart Apache,
−
 
 
−
Restart Apache to load the new Apache configuration:
 
  
 
  sudo systemctl restart apache2
 
  sudo systemctl restart apache2
  
−
You’ve now installed Nagios. But for this to work, it is necessary to install the Nagios Plugins, which you’ll cover in the next step.
+
==Step 2 — Installing Nagios Plugins==
−
 
 
−
==Step 2 — Installing the 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,
 
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-2.2.1.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
 +
 
  
−
Next configure their installation:
+
Konfigurasi & instalasi:
  
 +
cd /usr/local/src/nagios-plugins-2.3.3
 
  ./configure
 
  ./configure
−
  make
+
  sudo make
 
  sudo make install
 
  sudo make install
  
−
Now the plugins are installed, but you need one more plugin for monitoring remote servers. Let’s install it next.
+
==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
  
−
==Step 3 — Installing the check_nrpe Plugin==
+
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
  
−
Nagios monitors remote hosts using the Nagios Remote Plugin Executor, or NRPE. It consists of two pieces:
+
Install libssl-dev
  
−
* The check_nrpe plugin that the Nagios server uses.
+
apt -y install  libssl-dev
−
* The NRPE daemon, which runs on the remote hosts and sends data to the Nagios server.
 
  
 
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
  
−
Configure the 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
  
−
Let’s configure the Nagios server next.
+
==Step 4 — Konfigurasi Nagios server==
−
 
 
−
==Step 4 — Configuring Nagios==
 
  
−
Now let’s perform the initial Nagios configuration, which involves editing some configuration files. You only need to perform this section once on your Nagios server.
+
Konfigurasi awal Nagios, meliputi proses editing beberapa file konfigurasi. Kita hanya perlu melakukannya satu kali di Nagios server.
  
−
Open the main Nagios configuration file in your preferred text editor. Here, you’ll use nano:
+
'''Edit nagios.cfg'''
  
−
    sudo nano /usr/local/nagios/etc/nagios.cfg
+
sudo vi /usr/local/nagios/etc/nagios.cfg
  
−
Find this line in the file:
+
Temukan di /usr/local/nagios/etc/nagios.cfg
−
/usr/local/nagios/etc/nagios.cfg
 
 
   
 
   
 
  ...
 
  ...
Line 168: Line 138:
 
  ...
 
  ...
  
−
Uncomment this line by deleting the # character from the front of the line:
+
Buang # di depan cfg_dir, menjadi
−
 
 
−
/usr/local/nagios/etc/nagios.cfg
 
  
 
  cfg_dir=/usr/local/nagios/etc/servers
 
  cfg_dir=/usr/local/nagios/etc/servers
  
−
Save and close nagios.cfg by pressing CTRL+X, followed by Y, and then ENTER (if you’re using nano).
+
Buat directory tersebut. Ini akan menyimpan file konfigurasi untuk setiap server yang kita monitor,
  
−
Now create the directory that will store the configuration file for each server that you will monitor:
+
sudo mkdir -p /usr/local/nagios/etc/servers
  
−
sudo mkdir /usr/local/nagios/etc/servers
+
'''Edit contact'''
  
−
Open the Nagios contacts configuration in your text editor:
+
sudo vi /usr/local/nagios/etc/objects/contacts.cfg
  
−
sudo nano /usr/local/nagios/etc/objects/contacts.cfg
+
Ubah email dengan email kita di /usr/local/nagios/etc/objects/contacts.cfg
−
 
 
−
Find the email directive and replace its value with your own email address:
 
−
 
 
−
/usr/local/nagios/etc/objects/contacts.cfg
 
  
 
  ...
 
  ...
 
  define contact{
 
  define contact{
−
        contact_name nagiosadmin    ; Short name of user
+
        contact_name nagiosadmin    ; Short name of user
−
         use          generic-contact ; Inherit default values from generic-contact template (defined above)
+
        use         generic-contact ; Inherit default values from generic-contact template (defined above)
−
        alias         Nagios Admin    ; Full name of user
+
        alias       Nagios Admin    ; Full name of user
−
        email         your_email@your_domain.com  ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
+
        email       your_email@your_domain.com  ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
 
  ...
 
  ...
  
−
Save and exit the editor.
 
  
−
Next, add a new command to your Nagios configuration that lets you use the check_nrpe command in Nagios service definitions. Open the file /usr/local/nagios/etc/objects/commands.cfg in your editor:
 
  
−
sudo nano /usr/local/nagios/etc/objects/commands.cfg
 
  
−
Add the following to the end of the file to define a new command called check_nrpe:
+
'''Edit commands.cfg''''
−
/usr/local/nagios/etc/objects/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
  
 
  ...
 
  ...
Line 211: Line 178:
 
  }
 
  }
  
−
This defines the name and specifies the command-line options to execute the plugin.
+
Restart Nagios
−
 
 
−
Save and exit the editor.
 
−
 
 
−
Then start Nagios and enable it to start when the server boots:
 
  
 
  sudo systemctl start nagios
 
  sudo systemctl start nagios
  
−
Nagios is now running, so let’s log in to its web interface.
+
==Step 5 — Akses Nagios Web==
  
−
==Step 5 — Accessing the Nagios Web Interface==
+
Akses ke
  
−
Open your favorite web browser, and go to your Nagios server by visiting http://nagios_server_public_ip/nagios.
+
http://nagios_server_public_ip/nagios.
  
−
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.
+
username nagiosadmin
 +
password yangkitasetsebelumnya
  
−
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:
+
Untuk melihat host yang di monitor, kita bisa klik menu
  
−
Nagios Hosts Page
+
  Current Status > Hosts
  
−
As you can see, Nagios is monitoring only “localhost”, or itself.
+
Terlihat default Nagios hanya memonitor localhost
  
−
Let’s monitor our other server with Nagios,
+
==Step 6 — Installing Nagios Plugin & NRPE Daemon di Server yang di monitor==
  
−
==Step 6 — Installing Nagios Plugins and NRPE Daemon on a Host==
+
Untuk memonitor sebuah server, kita perlu menginstalasi Nagios Remote Plugin Executor (NRPE) di remote host tersebit, install plugin, dan konfigurasi Nagios server.
  
−
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.
+
Login server yang akan di monitor,
  
−
Log in to the second server, which we’ll call the second Ubuntu server:
+
ssh onno@your_monitored_server_ip
  
−
ssh sammy@your_monitored_server_ip
+
Buat user nagios yang akan menjalankan NRPE agent,
−
 
 
−
First create a nagios user which will run the 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 to your home directory with curl:
+
Download Nagios Plugins,
  
 +
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 314: 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 336: 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 v3.2.1
 
−
 
 
−
Repeat the steps in this section for each additional server you want to monitor.
 
  
−
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.
+
NRPE v4.0.3
−
==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.
+
==Step 7 — Monitoring Hosts dengan Nagios==
  
−
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:
+
Tambahkan host yang akan di monitor Nagios, edit
  
−
  sudo nano /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
+
  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
  
−
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:
+
Edit file /usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
−
/usr/local/nagios/etc/servers/your_monitored_server_host_name.cfg
 
  
 
  define host {
 
  define host {
Line 376: 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 389: 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
 
  
−
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.
+
Save & Quit.
−
 
 
−
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

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