Configure HA using Corosync and pacemaker

Opening needed Ports in Iptables if We are using IPtables
/etc/sysconfig/iptables. Towards the end of the file, but before any REJECT statements, we add the following lines:
-A INPUT -p udp -m state --state NEW -m multiport --dports 5404,5405 -j ACCEPT
-A INPUT -m tcp -p tcp --dport 7788 -j ACCEPT
-A INPUT -m tcp -p tcp --dport 3306 -j ACCEPT

Installing modules
yum -y install wget
rpm -Uvh http://elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm
yum -y install drbd84-utils kmod-drbd84 --enablerepo=elrepo
yum -y install pacemaker corosync cluster-glue

wget -P /etc/yum.repos.d/ http://download.opensuse.org/repositories/network:/ha-clustering:/Stable/CentOS_CentOS-6/network:ha-clustering:Stable.repo
yum install crmsh

Configure Corosync 

vi /etc/corosync/corosync.conf
totem {
version: 2
secauth: off
threads: 0
interface {
ringnumber: 0
bindnetaddr: 10.0.0.0
mcastaddr: 226.94.1.1
mcastport: 5405
ttl: 1
}
}

logging {
fileline: off
to_stderr: no
to_logfile: yes
to_syslog: yes
logfile: /var/log/cluster/corosync.log
debug: off
timestamp: on
logger_subsys {
subsys: AMF
debug: off
}
}

amf {
mode: disabled
}

service {
        # Load the Pacemaker Cluster Resource Manager
        ver:       1
        name:      pacemaker
}

aisexec {
        user:   root
        group:  root
}


chkconfig --level 3 corosync on
service corosync start
chkconfig --level 3 pacemaker on
service pacemaker start

Checking the Cluster Connectivity
corosync-objctl runtime.totem.pg.mrp.srp.members

Check the service and cluster status
crm_mon -1


Configuring the cluster
>>crm configure
property no-quorum-policy="ignore" pe-warn-series-max="1000" pe-input-series-max="1000" pe-error-series-max="1000" cluster-recheck-interval="5min"
property stonith-enabled=false
commit

Adding a Cluster server for common IP (VIP)
>>crm configure
primitive p_api-ip ocf:heartbeat:IPaddr2 params ip="10.0.0.199" cidr_netmask="24" op monitor interval="30s"
commit

Now we need to configure the needed services in the CRM.

  

Checking loadspeed of a Site Using phantomjs

Using  phantomjs to check different parameters of a site.

 Installing the module
sudo yum install fontconfig freetype libfreetype.so.6 libfontconfig.so.1 libstdc++.so.6

wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.7-linux-i686.tar.bz2
tar jxvf phantomjs-1.9.7-linux-i686.tar.bz2
mv phantomjs-1.9.7-linux-x86_64 phantomjs

export PATH=$PATH:/root/phantomjs/bin/

In the  phantomjs directory there are examples for js script. We use a test script provided by them for checking the load speed of site. 

phantomjs loadspeed.js http://www.adminz.in

Page title is Linux Conquering Cloud

Loading time 4559 msec

Basic examples

• arguments.js shows the arguments passed to the script
• countdown.js prints a 10 second countdown
• echoToFile.js writes the command line arguments to a file
• fibo.js lists the first few numbers in the Fibonacci sequence
• hello.js displays the famous message
• module.js and universe.js demonstrate the use of module system
• outputEncoding.js displays a string in various encodings
• printenv.js displays the system's environment variables
• scandir.js lists all files in a directory and its subdirectories
• sleepsort.js sorts integers and delays display depending on their values
• version.js prints out PhantomJS version number
• page_events.js prints out page events firing: useful to better grasp page.on* callbacks

Rendering/rasterization

• colorwheel.js creates a color wheel using HTML5 canvas
• rasterize.js rasterizes a web page to image or PDF
• rendermultiurl.js renders multiple web pages to images
• technews.js captures Google News as a PNG image

Page automation

• direction.js uses Google Maps to print driving direction
• follow.js shows the number of followers of some Twitter accounts
• imagebin.js uploads an image to imagebin.org
• injectme.js injects itself into a web page context
• ipgeocode.js deduces the location via IP geocoding
• movies.js lists movies from kids-in-mind.com
• phantomwebintro.js uses jQuery to read #intro element text from phantomjs.org
• pizza.js uses yelp.com to find pizza places in Mountain View
• seasonfood.js displays the BBC seasonal food list
• tweets.js displays the most recent tweets
• unrandomize.js modifies a global object at page initialization
• waitfor.js waits until a test condition is true or a timeout occurs

Network

• detectsniff.js detects if a web page sniffs the user agent
• loadspeed.js computes the loading speed of a web site
• netlog.js dumps all network requests and responses
• netsniff.js captures network traffic in HAR format
• post.js sends an HTTP POST request to a test server
• postserver.js starts a web server and sends an HTTP POST request to it
• server.js starts a web server and sends an HTTP GET request to it
• serverkeepalive.js starts a web server which answers in plain text
• simpleserver.js starts a web server which answers in HTML

Script to check the loading time of a Site

Script to check the loading time of a Site

========
#!/bin/bash
CURL="/usr/bin/curl"
GAWK="/usr/bin/gawk"
echo -n "Please pass the url you want to measure: "
read url
URL="$url"
result=`$CURL -o /dev/null -s -w %{time_connect}:%{time_starttransfer}:%{time_total} $URL`
echo " Time_Connect Time_startTransfer Time_total "
echo $result | $GAWK -F: '{ print $1" "$2" "$3}'
========

cat test.sh
#!/bin/bash
CURL="/usr/bin/curl"
GAWK="/usr/bin/gawk"
echo -n "Please pass the url you want to measure: "
read url
URL="$url"
result=`$CURL -o /dev/null -s -w %{time_connect}:%{time_starttransfer}:%{time_total} $URL`
echo " Time_Connect Time_startTransfer Time_total "
echo $result | $GAWK -F: '{ print $1" "$2" "$3}'

Sample Testing
[root@vps examples]# sh test.sh
Please pass the url you want to measure: http://www.adminz.in
 Time_Connect Time_startTransfer Time_total
0.294 0.604 1.255
[root@vps examples]#