Centos6.3 implementation of the Lvs+keepalive implementation of HTTP service on the dual-machine hot standby

First, the initial environment deployment

Two CentOS 6.3 installations are minimal, initializing the system environment

Host Configuration master:192.168.0.250 24

backup:192.168.0.249 24

vip:192.168.0.66 24

Test side: 192.168.0.252 24

Configure the local Yum source with the following operations on both Masters

cd/etc/yum.repos.d/

MV Centos-base.repo Centos-debuginfo.repo centos-vault.repo/root/

VI Centos-media.repo

[C6-media]

name=centos-$releasever-media

baseurl=file:///mnt/

file:///media/cdrom/

file:///media/cdrecorder/

gpgcheck=0

Enabled=1

mount/dev/cdrom/mnt/

install basic compilation tools, and other toolkit

Yum-y Install make GCC openssl-devel

Yum-y Install Lrzsz ipvsadm sendmail httpd

Ii. Installing the LVS and keepalived packages

To see if the kernel supports LVS

Modprobe-l |grep Ipvs

Kernel/net/netfilter/ipvs/ip_vs.ko

Kernel/net/netfilter/ipvs/ip_vs_rr.ko

Kernel/net/netfilter/ipvs/ip_vs_wrr.ko

Kernel/net/netfilter/ipvs/ip_vs_lc.ko

Kernel/net/netfilter/ipvs/ip_vs_wlc.ko

Kernel/net/netfilter/ipvs/ip_vs_lblc.ko

Kernel/net/netfilter/ipvs/ip_vs_lblcr.ko

Kernel/net/netfilter/ipvs/ip_vs_dh.ko

Kernel/net/netfilter/ipvs/ip_vs_sh.ko

Kernel/net/netfilter/ipvs/ip_vs_sed.ko

Kernel/net/netfilter/ipvs/ip_vs_nq.ko

Kernel/net/netfilter/ipvs/ip_vs_ftp.ko

The above information shows support, kernel2.6 later support

Download keepalived-1.2.15.tar.gz in www.keepalived.org

TAR-ZXVF keepalived-1.2.15.tar.gz

CD keepalived-1.2.15

./configure--sysconf=/etc--with-kernel-dir=/usr/src/kernels/2.6.32-279.el6.x86_64

Make && make install

Ln-s/usr/local/sbin/keepalived/sbin/(Point keepalived to/sbin/)

Vi/etc/keepalived/keepalived.conf

! Configuration File for Keepalived

Global_defs {

Notification_email {

[Email protected] (here is the email address to send the alarm)

[Email protected]

[Email protected]

[Email protected]

}

Notification_email_from [email protected]

Smtp_server 192.168.0.250 (This is the right-click Server address)

Smtp_connect_timeout 30 (Connection SMTP service time-out)

router_id Lvs_devel

}

Vrrp_instance Vi_1 {

State MASTER (Server role development)

Interface eth0

VIRTUAL_ROUTER_ID 51 (Virtual route ID, one cluster ID must be the same)

Priority 100 (role precedence, the higher the value, the greater the priority)

Advert_int 1 (The time interval, in seconds, between master and backup synchronization checks)

Authentication {

Auth_type Pass (authentication type, with Pass and AH)

Auth_pass 1111 (authentication key, two machines must be the same)

}

virtual_ipaddress {

192.168.0.66 (virtual IP address)

}

}

Virtual_server 192.168.0.66 80 {

Delay_loop 6 (Run-time check interval)

Lb_algo RR (set load scheduling algorithm)

Lb_kind DR (load Balancing mechanism, set DR, Nat and Tun mode)

Nat_mask 255.255.255.0

Persistence_timeout 50

Protocol TCP (Set transport protocol to TCP)

Real_server 192.168.0.250 80 {

Weight 1 (server weight setting)

Tcp_check {

Connect_timeout 3 (indicates a 3 second non-responsive supermarket)

Nb_get_retry 3 (Retry times 3 times)

Delay_before_retry 3 (Retry time interval 3 seconds)

}

}

Real_server 192.168.0.249 80 {

Weight 1

Tcp_check {

Connect_timeout 3

Nb_get_retry 3

Delay_before_retry 3

}

}

}

On the master host configuration as above, in the backup host wish to modify

State BACKUP

Priority 90

Vi/etc/init.d/lvsrs (writing realserver startup script)

#!/bin/bash

ns_vip=192.168.0.66

/etc/rc.d/init.d/functions

Case "$" in

Start

/sbin/ifconfig lo:0 $SNS _vip netmask 255.255.255.255 broadcast $SNS _VIP up

/sbin/route add-host $SNS _vip Dev lo:0

echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

Syscty-p >/dev/null 2>&1

echo "Realserver Start OK"

;;

Stop

Ifconfig lo:0 Down

Route del $SNS _VIP >/dev/null 2>&1

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

echo "Realserver stoped"

;;

*)

echo "Usage: $ {start|stop}"

Exit 1

Esac

Exit 0

chmod 755/etc/init.d/lvsrs

/etc/init.d/keepalived start

/etc/init.d/lvsrs start

Third, the test configuration is correct

Execute on Master

echo "This is Master" >/var/www/html/index.html

Service httpd Start

Execute on Backup

echo "This is Backup" >/var/www/html/index.html

Service httpd Start

Both machines are shutting down the firewall

Service Iptables Stop

In the test-side browser input http://192.168.0.66

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Then stop the httpd service on master.

Service httpd Stop

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We can see that we have switched to the backup server and checked the backup log

Tail-f/var/log/messages

Mar 03:35:22 Backup keepalived_healthcheckers[3123]: removing service [192.168.0.249]:80 from VS [192.168.0.66]:80

Mar 03:35:22 backup keepalived_healthcheckers[3123]: SMTP connection ERROR to [192.168.0.250]:25.

Mar 03:39:46 backup keepalived_healthcheckers[3123]: TCP connection to [192.168.0.249]:80 success.

Mar 03:39:46 backup keepalived_healthcheckers[3123]: Adding service [192.168.0.249]:80 to VS [192.168.0.66]:80

Mar 03:39:46 backup keepalived_healthcheckers[3123]: Remote SMTP Server [192.168.0.250]:25 connected.

Mar 03:39:46 backup keepalived_healthcheckers[3123]: Error reading data from remote SMTP server [192.168.0.250]:25.

Mar 03:39:55 backup keepalived_healthcheckers[3123]: TCP connection to [192.168.0.250]:80 failed!!!

Mar 03:39:55 Backup keepalived_healthcheckers[3123]: removing service [192.168.0.250]:80 from VS [192.168.0.66]:80

Mar 03:39:55 backup keepalived_healthcheckers[3123]: Remote SMTP Server [192.168.0.250]:25 connected.

Mar 03:39:55 backup keepalived_healthcheckers[3123]: Error reading data from remote SMTP server [192.168.0.250]:25.

Note: Master downtime backup takes over, master Recovery backup still provides service, when backup downtime master will take over the service! Not the master recovery service and master! back from backup

The dual-Machine hot standby function has been realized, will you?

This article is from the "technical achievements of the Future" blog, please make sure to keep this source http://linuxmysqldba.blog.51cto.com/2530817/1619681

Centos6.3 implementation of the Lvs+keepalive implementation of HTTP service on the dual-machine hot standby