jonny » Red Branch

Minecraft Spigot Server on CentOS 7

March 2, 2019 jonny Uncategorized

I’m just recording some notes here on the steps I took to run a Minecraft (Spigot) server on a CentOS 7 server. Install Pre-requisites

yum install git&nbsp;python-twisted-core&nbsp;python-psutil&nbsp;python-urwid&nbsp;python-twisted-web screen

1	yum install git python-twisted-core python-psutil python-urwid python-twisted-web screen

Get Java You could try using OpenJDK with

[crayon-5c9a25a16758b554077565  ]yum install&nbsp;java-1.8.0-openjdk

1	[crayon-5c9a25a16758b554077565 ]yum install java-1.8.0-openjdk

[/crayon] Or visit the Oracle website agree to the license agreement and download the jdk-8u131-linux-x64.rpm file. Copy that file to your server using SCP and… Read more »

Hostname Completion

January 22, 2019 jonny shell

Courtesy of Pete in work. To enable hostname auto completion in Bash, do the following: dig pop @dns.server.tld axfr | awk ‘$4 ~ /\yA\y/ && gsub(/.$/,””,$1) {print $1}’ > ~/.hosts If you would prefer to filter out hosts e.g. dev and swi, change awk to: awk ‘$4 ~ /\yA\y/ && ! /dev/ && ! /swi/… Read more »

Changing Dell iDRAC Password with racadm

January 7, 2019 jonny Uncategorized

The default user and password combination for a Dell iDRAC interface is root / calvin It can be manually reset when logging in to the web interface but when doing many machines at once and many actions at the same time the racadm tool is handy. To change the password use: racadm -r 192.168.1.23 -u… Read more »

Querying Zookeeper from Python

November 6, 2018 jonny python

Install the prerequisites. Below works for Debian-based distros such as Ubuntu/Mint:

apt-get install libzookeeper-mt-dev

1	apt-get install libzookeeper-mt-dev

Install python libraries:

pip install zkpython pykeeper

1	pip install zkpython pykeeper

Example code below shows making a connection, getting the names of some child nodes and pulling info from each of those child nodes:

import pykeeper
import json

client = pykeeper.ZooKeeper('192.168.1.2:2181')
client.connect()

coords = client.get_children('/druid/coordinator/_COORDINATOR')

list_of_coord_addresses = []

for coord in coords:
  zk_coord = client.get('/druid/coordinator/_COORDINATOR/%s' % coord )
  list_of_coord_addresses.append(zk_coord[0])

print(list_of_coord_addresses)

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import pykeeper

import json

client = pykeeper.ZooKeeper('192.168.1.2:2181')

client.connect()

coords = client.get_children('/druid/coordinator/_COORDINATOR')

list_of_coord_addresses = []

for coord in coords:

zk_coord = client.get('/druid/coordinator/_COORDINATOR/%s' % coord )

list_of_coord_addresses.append(zk_coord[0])

print(list_of_coord_addresses)

Unfortunately I can’t get this installed on CentOS.

Install check_mk on Ubuntu 18.04

November 5, 2018 jonny nagios

Ubuntu 18.04 includes check-mk in the repository version but it is an older version 1.2.8 (at the time of writing). Download check mk raw (get the latest stable URL from the website) :

wget https://mathias-kettner.de/support/1.5.0p7/check-mk-raw-1.5.0p7_0.bionic_amd64.deb

1	wget https://mathias-kettner.de/support/1.5.0p7/check-mk-raw-1.5.0p7_0.bionic_amd64.deb

Try installing it:

dpkg -i dpkg -i check-mk-raw-*.deb

1	dpkg -i dpkg -i check-mk-raw-*.deb

You may get dependency issues which can be resolved with:

apt-get install -f

1	apt-get install -f

Then try the install again:

dpkg -i check-mk-raw-*.deb

1	dpkg -i check-mk-raw-*.deb

iDRAC 9 Set Physical Disk to Non-RAID

October 30, 2018 jonny Uncategorized

In the update from iDRAC 8 to iDRAC 9 it has been infuriating searching the ‘Storage’ menu only to discover that the storage is managed under ‘Configuration > Storage Configuration’ I’m convinced the user experience could be better! At the very least a link through for configuration.

Clearing old Journald Logs

October 1, 2018 jonny Uncategorized

Journald logs can be cleared by timescale or size as follows. Keep only 5 days worth of logs journalctl –vacuum-time=5d Retain only the past 500 MB: journalctl –vacuum-size=500M

Checking if Puppet is Disabled

October 1, 2018 jonny puppet

The puppet agent can be disabled from running with:

puppet disable "Some message here"

1	puppet disable "Some message here"

And it can be re-enabled with:

puppet enable

1	puppet enable

But to check if puppet is currently disabled there is no check command. Instead look for the existence of the agent_disabled.lock file under:

$vardir/state/agent_disabled.lock

1	$vardir/state/agent_disabled.lock

For the systems I was checking this was at:

/opt/puppetlabs/puppet/cache/state/agent_disabled.lock

1	/opt/puppetlabs/puppet/cache/state/agent_disabled.lock

Exclude Directories for Disk Usage (du)

August 29, 2018 jonny linux, shell

I sometimes want to omit directories from my disk usage (du -sh *) checks. This includes virtual files systems such as proc / dev and also mounts to other filesystems (data in the example below). This is what works for me:

du --exclude={proc,sys,dev,data} -sh *

1	du --exclude={proc,sys,dev,data} -sh *

The equals sign appears to be optional and worked both ways for me…. Read more »

Joining Multi-line Output with Paste

July 31, 2018 jonny shell

I was checking the memory on approximately 140 servers using ansible:

ansible --user root -k -i servers.list -m shell -a  "free -h; mysql" test

1	ansible --user root -k -i servers.list -m shell -a "free -h; mysql" test

but the output appears over several lines e.g.

server103.domain.dev | SUCCESS | rc=0 &gt;&gt;
total used free shared buffers cached
Mem: 94G 44G 49G 59M 203M 4.6G
-/+ buffers/cache: 39G 54G
Swap: 0B 0B 0B

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server103.domain.dev | SUCCESS | rc=0 >>

total used free shared buffers cached

Mem: 94G 44G 49G 59M 203M 4.6G

-/+ buffers/cache: 39G 54G

Swap: 0B 0B 0B

but what I wanted was the server name and the total memory available. So I first grepped the output to remove the lines I didn’t want e.g.

grep -A3 "domain.dev" | egrep -v "^--|Swap|total|buffer"

1	grep -A3 "domain.dev" \| egrep -v "^--\|Swap\|total\|buffer"

leaving me with two lines of… Read more »

Posts By: jonny