Nagios NRPE client install on ubuntu 22.04

 Install NRPE agent from default ubuntu Repos.
 
apt install nagios-nrpe-server
 
Configuration changes:
 
nano /etc/nagios/nrpe.cfg

 
 
command[check_disk]=/usr/lib/nagios/plugins/check_disk  -w 60 -c 50 -u GB -p /
 
allowed_hosts=127.0.0.1,$nagios_server_ip
 
 
Restart service:

/etc/init.d/xinetd restart
/etc/init.d/nagios-nrpe-server restart

 
 
Nagios server configurations:
 
nano /nagios/server/directory/server.cfg
 

define host{
use                             linux-server
host_name                       hostname
alias                           hostname
address                         IP
max_check_attempts              2
check_period                    24x7
notification_interval           30
notification_period             24x7
}
define service{
        use                     generic-service
        host_name               hostname
        service_description     Disk Usage
        check_command           check_nrpe!check_disk!-a '-w 60 -c 50 -u GB -p /'
}

 
 
 
 

Convert MBR to GPT in AWS

 First check partition type of existing disk.

 parted -l

 

To convert MBR to GPT, create one partition with gpt and that will convert entire disk from msdos to gpt.

gdisk /dev/nvme0n1

■ n (i.e. new partition)
■ Enter (i.e Partition number : 2-128, default 2)
■ Enter (i.e. First sector : default = 34)
■ Enter (i.e. Last sector : default = 2047)
■ ef02 (i.e. Type of partition: BIOS boot partition)
■ w (i.e. Write the new partition table)
■ Y (i.e. Complete process)

Reload the partition table 

partprobe /dev/nvme0n1  

Re-install the GRUB boot loader using the new partition scheme 

grub-install /dev/nvme0n1
 

Increasing EBS volume 

growpart /dev/nvme0n1 1
resize2fs /dev/nvme0n1p1

Now Re-check the partition table created properly or not.

parted -l

CISCO AnyConnect VPN Client in Ubuntu

OpenConnect is a client for Cisco’s AnyConnect VPN. It is free software, and is released under the GNU LGPL v2.1 . Getting connected to an AnyConnect VPN is easy with OpenConnect and the TUN/TAP kernel module that is built into the Linux kernel.
 
1. First run command below to active th TUN module:
 
sudo /sbin/modprobe tun
 
2. Install OpenConnect:
 
sudo apt-get install openconnect
 
3. Connect to VPN, run:
 
sudo openconnect yourvpn.example.com
 
It prompts you to type in username and password. Once these are authenticated, the VPN connection is established.

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