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Sypnosis

What is GlusterFS? Read [here] (https://gluster.readthedocs.io/en/latest/Administrator%20Guide/GlusterFS%20Introduction/) :)

The main purpose of this documentation is to easily setup GlusterFS, a Network Attached Storage system across multiple servers without having to go thru complicated implementation.

This guide is meant for audiences that has minimal knowledge of Linux filesystem and GlusterFS.

References

• https://access.redhat.com/documentation/en-US/Red_Hat_Storage/3/html/Administration_Guide/Formatting_and_Mounting_Bricks.html

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What's Openshift?

Please watch: https://www.youtube.com/watch?v=yFPYGeKwmpk

Centos 7 Installation Guide

Pre-requisite

Based from https://docs.openshift.org/latest/install_config/install/advanced_install.html, we will install Openshift Origin on a single host that will act as a single master node (schedulable).

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Issue 1 - ADCFGCLONE completes for Application Server but Autoconfig fails

Problem

Sample errors that can be found at the bottom of $INST_TOP/admin/log/ApplyAppsTier_xxxx.log

[AutoConfig Error Report]
The following report lists errors AutoConfig encountered during each
phase of its execution.  Errors are grouped by directory and phase.
The report format is:

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Create the file $HOME/.vimrc with this content.

set paste

filetype plugin indent on
" show existing tab with 4 spaces width
set tabstop=4
" when indenting with '>', use 4 spaces width
set shiftwidth=4

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Common Git hacks

Rebasing develop branch from the latest changes of master branch.

git clone http://projectA.git -b develop
git pull --rebase origin master
# Resolve merge conflicts
git add <the resolved files>
git rebase --continue
git commit -m "Merged from master branch" # or git commit --amend -m "Overwriting the current commit"

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const net = require('net');
const sockets = [];

const server = net.Server((socket) => {
    sockets.push(socket);

    socket.on('data', (data) => {
        for (let i=0; i < sockets.length; i++) {
            sockets[i].write(data);
        }

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General User Management and Security

Add anyuid privilege to a service account

oc adm policy add-scc-to-user anyuid -z serviceAccountName -n namespaceName

Enable a serviceAccount from destinationProject to pull images from sourceProject

oc policy add-role-to-user system:image-puller system:serviceaccount:destinationProject:serviceAccount --namespace=sourceProject

Networking

Expose an app Port using NodePort

In this example, we are exposing the oracle-xe deployment config containerPort 1521 to nodePort 30401.

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Only proven to work on CentOS and Rhel servers.

1. Attach a storage device in the server. In this scenario, it's /dev/sdb. lsblk

   DEVICE_NAME="/dev/sdb"
   NFS_DIR="/nfs-dir"
   FS_TYPE="xfs"
   #FS_TYPE="ext4" #I recommend for AWS EBS

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Some hacks for you DevOps peeps

To test these go to Manage Jenkins --> Script Console.

Table of Contents

• Creating a Gitlab API Token Credential
• Create a Global Pipeline Libs

Creating a Gitlab API Token Credential

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alias clear-dns-cache='sudo killall -HUP mDNSResponder;sudo killall mDNSResponderHelper;sudo dscacheutil -flushcache;say MacOS DNS cache has been cleared, Sir JB'

# Liferay Hacks
export LR_DATE=${LR_DATE:-$(date +%Y-%m-%d)}
export LR_HOME=/Users/john.bryan.j.sazon/Servers/liferay/liferay-dxp-digital-enterprise-7.0-sp4
export LR_TOMCAT_HOME=/Users/john.bryan.j.sazon/Servers/liferay/liferay-dxp-digital-enterprise-7.0-sp4/tomcat-8.0.32