01. Edit kernel configuration file to add below line. Add this at the end-of-file.
Load balancing in HAProxy and Keepalived at the same time also requires the ability to bind to an IP address that are nonlocal, meaning that it is not assigned to a device on the local system. This allows a running load balancer instance to bind to an IP that is not local for failover.
]# vim /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind = 1
02. Reload kernel settings without restart system.
]# sysctl -p
03. Install haproxy package.
]# yum install haproxy -y
04. Edit the file. Note, we have ready-made configuration file 'haproxy.cfg' with this notes. Just copy/paste it over here.
]# vim /etc/haproxy/haproxy.cfg
05. Check the configuration file for any errors.
]# haproxy -c -f /etc/haproxy/haproxy.cfg
06. Start haproxy service.
]# service haproxy start
]# chkconfig haproxy on
08. TESTING: Use the IP of HAPROXY server in browser.
Browser url : http://ip-address-of-server
09. View haproxy logs. (Press CTRL+C to quit)
]# tail -f /var/log/messages
STATISTICS:
Browser : http://IP-ADDRESS/haproxy?stats
Note, Username and Password specified in haproxy.cfg file.
10. Restart haproxy everytime you update the configuration file.
]# service haproxy restart
11. Use below command to stop haproxy service.
]# service haproxy stop
Now Setup Cron:
=============
[root@ip-172-31-9-134 web]# crontab -l
#0 0 * * * /bin/bash /opt/backup/web/folder-bak.sh >> /opt/backup/web/folder-bak.log
1 1,3,5,7,9,11,13,15,17,19,21,23 * * * /opt/backup/web/log-rotate.sh >> /opt/backup/web/log-rotate.log
[root@ip-172-31-9-134 web]# cat log-rotate.sh
#!/bin/sh
#############################################################
# File: folder-backup.sh
# Description: A shell script to backup Multiple FOLDERs
# Cron Example: 0 2 * * * sh /path/to/direbackup.sh
#############################################################
# a. create a folder /opt/backup/web b. check DISKFREE parameter c. --exclude option in tar
####DEFINE THESE#############################################
FOLDERLIST="/var/log/messages";
DUMPBASEDIR="/opt/backup/web";
SCPTOREMOTE=0;
####END CHANGE HERE###########################################
DATE=`/bin/date +%d-%b-%Y_%k:%M`;
DUMPDIR="$DUMPBASEDIR/$DATE";
if [ ! -d $DUMPDIR ];
then
echo "Creating Directory: ".$DUMPDIR;
mkdir $DUMPDIR;
fi
for FOLDER in $FOLDERLIST
do
echo "FOLDER $FOLDER Backup Started";
WOBFOLDER=${FOLDER/#\//}
tar -czf $DUMPBASEDIR/$DATE/${WOBFOLDER//\//-}.tar.gz $FOLDER
echo "FOLDER $FOLDER Backup Completed";
done
cat /dev/null > /var/log/messages
exit;
:wq
=======================
FC main sample config file :
haproxy]# cat haproxy.cfg
#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local0
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 20000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 1m
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 20000
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend main *:80
acl has_url_begning url_beg -i /?betaexit=1 /m/ /m? /svc/ /r/ /robots.txt /svcstage/
use_backend webfarm-redirect if has_url_begning
acl has_url_pathdir path_dir -i m svc r svcstage
use_backend webfarm-redirect if has_url_pathdir
acl is_match_string url_sub betaexit=1 /?betaexit=1 /m/ /m? /svc/ /r/ /robots.txt /svcstage/
use_backend webfarm-redirect if is_match_string
acl has_url_extension path_end -i xml txt .xml .txt
use_backend webfarm-redirect if has_url_extension
acl cookie_found hdr_sub(cookie) betaexit
use_backend webfarm-redirect if cookie_found
default_backend webfarm
#---------------------------------------------------------------------
# backend for above conditional redirection
#---------------------------------------------------------------------
backend webfarm-redirect
balance roundrobin
cookie SERVERID insert indirect nocache
server web01 www.example.com.edgesuite.net:80 check cookie web01
#---------------------------------------------------------------------
# the default backend
#---------------------------------------------------------------------
backend webfarm
balance roundrobin
cookie SERVERID insert indirect nocache
server web01 www.example.com.edgesuite.net:80 check cookie web01 weight 89
server web02 Beta-example-Application-LB-1080059167.ap-southeast-1.elb.amazonaws.com:80 check cookie web02 weight 11
#---------------------------------------------------------------------
# statistics for haproxy
#---------------------------------------------------------------------
stats enable
stats uri /haproxy?stats
stats realm Haproxy\ Statistics
stats auth haproxy:stats
stats refresh 1s
===========================
haproxy]# cat haproxy.cfg
#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local0
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 20000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10m
timeout queue 10m
timeout connect 10m
timeout client 10m
timeout server 10m
timeout http-keep-alive 1m
timeout check 1m
maxconn 20000
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend main *:80
redirect prefix http://www.example.com code 302 if { hdr(host) -i beta.example.com }
default_backend webfarm
#---------------------------------------------------------------------
# the default backend
#---------------------------------------------------------------------
backend webfarm
balance roundrobin
cookie SERVERID insert indirect nocache
server web01 www.example.com:80 check cookie web01 weight 100
# server web02 Beta-example-Application-LB-1080059167.ap-southeast-1.elb.amazonaws.com:80 check cookie web02 weight 80
#---------------------------------------------------------------------
# statistics for haproxy
#---------------------------------------------------------------------
stats enable
stats uri /haproxy?stats
stats realm Haproxy\ Statistics
stats auth haproxy:stats
stats refresh 10s
