nagios check_yum

October 20, 2016nagios, UncategorizedPF

Okay!, here we go.

Download check_yum plugin from https://github.com/calestyo/check_yum/blob/master/check_yum to /usr/lib64/nagios/plugins/ on your CentOS nrpe server.

Add the command on your nagios.cfg

command[check_yum]=/usr/lib64/nagios/plugins/check_yum

Restart NRPE

/bin/systemctl restart  nrpe.service

And on your nagios server on your host/s5.domain.com.cfg

define service {
    use                    generic-service
    host_name              s5.domain.com
    service_description    SYS: system updates
    check_command          check_nrpe!check_yum!1
}

Restart Nagios

/bin/systemctl restart  nagios.service

Some tracks from GARAGE SESSIONS 02 | CLINT STEWART

A track from GARAGE SESSIONS 02 | CLINT STEWART
Emanate – “Stepping Through Windows (Choose Your Fate Mix)”

nagios check_apt

October 19, 2016nagiosapt, check_apt, nagios, nprePF

Return code of 127 is out of bounds – plugin may be missing

On the check_command, I had to prepend check_nrpe! since we are using the nrpe client on the server to read and return us the desired value.

No output returned from plugin

On the check_command, I had to append, with for example !1, since we need to pass $$ARG1$$

NRPE: Command ‘check_apt’ not defined

Check you /etc/nagios/nrpe.cfg you need to set it up there.

Well, I got it working!

On nagios nrpe server my /etc/nagios/nrpe.cfg I add the following line

command[check_apt]=/usr/lib/nagios/plugins/check_apt

Restart nagios-nrpe

service nagios-nrpe-server restart

On nagios server my /etc/nagios/hosts/s4.domain.com.cfg this is what I have

define service {
   use                     generic-service
   host_name               s4.domain.com
   service_description     SYS: system updates
   check_command           check_nrpe!check_apt!1
}

Restart nagios server

service nagios restart

Hooray!

captura-de-ecra%cc%83-2016-10-20-as-07-30-19

iptables unban ip and ban entire subnet

October 18, 2016Linuxiptables, unbanPF

iptables

unban ip

List entries with line numbers

iptables -L -v --line-numbers

Delete entry

iptables -D name_of_chain number_of_line_with_IP_that_you_want_to_delete

Let’s imagine that we want to unban 91.194.16.60! chain name is ‘f2b-sshd‘ and line number is 10!

f2b-ssh-unban

iptables -D f2b-sshd 10

Ban entire subnet

Example (banning some chinese sh*t)

iptables -A INPUT -s 119.249.54.0/24 -j DROP
iptables -A INPUT -s 121.18.238.0/24 -j DROP

Ubuntu Nagios NRPE – 1, 2, 3 install!

October 15, 2016nagios, Ubuntunagios, nrpePF

0. Update the system

apt-get update && apt-get upgrade

1. Install nagios nrpe & nagios plugins

apt-get install nagios-nrpe-server nagios-plugins

2. Configure NRPE

vi /etc/nagios/nrpe.cfg

Search for server_address and replace 120.0.0.1 for the public ip of this machine.
Search for allowed_hosts and replace 120.0.0.1 for the IP of your nagios server.

3. Restart NRPE

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

That’s kinda it…

mydomain.com really? political questions?!

October 13, 2016Domainingmydomain, silly, sillyquestionsPF

captura-de-ecra%cc%83-2016-10-13-as-20-14-11

Dell PowerEdge R220, 2 × 2 TB SATA

October 9, 2016Sh*tsdell, r220PF

largepng
Got a new DELL R220 to replace two existing servers… the HP DL120G7 and the SuperMicro Intel® C2750 (Avoton).

Manufacturer: Dell PowerEdge R220
Processor: Xeon E3 1x Intel® Xeon® E3 1230 v3 4 C / 8T @3.3 Ghz cache L3 8MB, x64, VT
Memory: 32 GB DDR3 ECC
Storage: 2 × 2 TB SATA

This time, I’m using CentOS!