krishnamurthydasari

Variables:
==========

1. It can be only one word.
2. It can use only letters, numbers, and the underscore (_) character.
3. It can’t begin with a number.
4. Variables are case-sensitive

Expression - Expressions consist of values (such as 2) and operators (such as +), and they can always evaluate (that is, reduce) down to a single value.

krishnamurthydasari

Gitlab Setup:
=============

	Requirements:
	------------
	
	Ruby
	PostgreSQL
	Redis
	Prometheus

krishnamurthydasari

jmap needs openjdk-debuginfo package. Install and try below command for heap usage

yum list *openjdk-debuginfo* --enablerepo=*
yum install java-1.8.0-openjdk-debuginfo.x86_64 --enablerepo=amzn-updates-debuginfo

-----
From below output counting all used entries will get actual heap usage. Note that New Generation includes Eden and 1 survivor space. So in provided scripts below i have removed first entry for new generation and considered rest all.


[root@ip-50-1-0-167 jvm]# jmap -heap 13621

krishnamurthydasari

If server is used only for forward requests:

options {
        .
        .
        
        allow-query     { localhost; any; };
        recursion yes;
        forward only;
        .

krishnamurthydasari

For this setup:

	DNS Master Server	172.31.88.75
	DNS Slave Server	172.31.93.71
	Host1			172.31.83.52
	Host2			172.31.88.91
	
	** Configured only fws zone. Reverse zone setup not tested.
	** Reference : https://www.tecmint.com/setup-master-slave-dns-server-in-centos/
	

krishnamurthydasari

x11 server setup:

server side:

yum install xorg-x11-xauth xterm -y

Client side:

install mobaxterm (OR any x server gui tool) and connect from that tool

krishnamurthydasari

1.	Update security group to allow 5666, ICMP request and SSH protocols from nagios server 34.193.101.102/32

2.	Run below commands to install Nagios client

mkdir /opt/Nagios
cd /opt/nagios/
wget https://assets.nagios.com/downloads/nagiosxi/agents/linux-nrpe-agent.tar.gz
tar xvf linux-nrpe-agent.tar.gz
cd linux-nrpe-agent 
./fullinstall

krishnamurthydasari

Expending root disk size when root device has partition inside it, directly running resize2fs command will not work, 
Follow below steps to resolve issue.

Check "lsblk" command output for root device name and filesystem type, these steps works for ext3 and ext4
If root device name is /dev/xvda1, then

growpart /dev/xvda 1   ### Note the space between /dev/xvda and 1
resize2fs /dev/xvda1
partprobe

krishnamurthydasari

1.  Install GNOME and VNC server packages 

    yum --exclude=nautilus-sendto groupinstall "GNOME Desktop Environment"
    yum install vnc-server

2.  Create your VNC users. You can use existing users if already have.

    #useradd Krishna
    #passwd Krishna

krishnamurthydasari

#!/bin/bash
#Date		: 13-07-2017
#Owner		: Krishnamurthy Dasari
#Description: Pull the changes from upstreem to local git repository, upload all changes to s3 bucket and send email alert with changed files.

GitLocalRepoDir="/path/to/local/directory"

s3bucket="s3://BucketName"
email_subject="Subject"
email_From="[email protected]"