Solved: nrpe[]: Host 172.23.99.999 is not allowed to talk to us!
Today we will see one of the most common Nagios NRPE error message and its resolution. Lets see the error message and its resolution. I. Error Message [root@ngelinux001 ~]# service...
Tag: hosts
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Ansible commands cheatsheet
Ansible Cheatsheet Today we will look at various frequently used Ansible commands that i used to refer everytime. We are connecting to remote users via username “john” 1. Get...
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Solved: nfsmnthelp: 1831-019 host2: System call error number -1.
Recently i have faced an interesting issue when i was trying to mount a NFS partition. The NFS partition was failed to mount with some strange error message “System call...
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How to work on multiple servers together in a single time ?
Today we will introduce you to a very useful tip to perform server operations on multiple servers together. For this we will use a a application called csshx shared by...
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Python Ping Script: Ping a list of hosts/servers from a file in python ?
Lets start with python programming and see how to ping a list of servers from a hosts file. First lets start with program. I. Program import os hostsfile=open("hosts", "r") lines=hostsfile.readlines()...
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How to run ansible playbook on a single or multiple selected host(s) ?
Lets see how to run a playbook on a single selected host or multiple selected hosts. We can either make groups in hosts file or mention the host name using...
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First YAML Script: Ansible playbook to ping all hosts in the list.
Let us start creating the ansible yaml scripts or playbooks. The first playbook that we create involves checking if the host is alive or not i.e. ping status of all...
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First configuration after ansible install before creating YML scripts.
In the last post, we have seen how to install ansible on our system. After ansible install before creating YML script and running it, we should setup some files to...
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How to scan SCSI disks and storage FC luns in Linux ?
In Linux, we can scan for new SCSI disks’ LUN or FC LUNs in real time without rebooting the server. For this we need to I.) reset the FC or...
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Different ways to block a hostname or IP address in Linux ?
Today we will look at an interesting topic to know the various ways to block specific hostnames or IP addresses on a Linux machine. 1. TCP Wrappers /etc/hosts.allow and /etc/hosts.deny...