Shulou(Shulou.com)06/02 Report--

LVS+Keepalived High availability Cluster

Catalogue

Part I Environmental preparation

The second part uses Keepalived to build dual-computer hot backup.

The third part configures the Web node server

Part IV testing LVS+Keepalived High availability Cluster

Part I Environmental preparation

One: two dispatchers (dual hot standby)

System: Linux-CentOS 7.4

IP address: 192.168.80.10 (primary)

IP address: 192.168.80.20 (standby)

Two Web servers

System: Linux-CentOS 7.4

IP address: 192.168.80.30 (SERVER AA)

IP address: 192.168.80.40 (SERVER BB)

Three: a client computer: take win7 as an example, for testing

IP address: 192.168.80.2

The second part uses Keepalived to build dual-computer hot backup.

Step 1: configure the main scheduler

[root@dd01 ~] # modprobe ip_vs / / load ip_vs module

[root@dd01] # rpm-ivh / mnt/Packages/ipvsadm-1.27-7.el7.x86_64.rpm / / install the management software ipvsadm

[root@dd01 ~] # yum-y install gcc gcc-c++ make popt-devel kernel-devel openssl-devel

/ / install compilation tools and plug-ins

[root@dd01 ~] # tar xzvf keepalived-1.4.2.tar.gz / / extract the keepalived installation package

[root@dd01 ~] # cd keepalived-1.4.2/

[root@dd01 keepalived-1.4.2] # / configure-- prefix=/ configuration

[root@dd01 keepalived-1.4.2] # make & & make install / / compile and install

[root@dd01 keepalived-1.4.2] # cp keepalived/etc/init.d/keepalived / etc/init.d/

/ / join the system management service

[root@dd01 keepalived-1.4.2] # systemctl enable keepalived / / set boot self-startup

[root@dd01 keepalived-1.4.2] # vi / etc/keepalived/keepalived.conf / / Edit configuration file

! Configuration File for keepalived

Global_defs {

Router_id LVS_01 / / name of this server

}

Vrrp_instance VI_1 {/ / define VRRP hot backup instance

State MASTER / / Hot standby status. MASTER represents master server and BACKUP represents slave server.

Interface ens33 / / physical interface that carries the VIP address

Virtual_router_id 51 / / ID number of the virtual router, consistent with each hot backup group

Priority 110 / / priority, the higher the number, the higher the priority.

Advert_int 1 / / seconds between announcements (heartbeat rate)

Authentication {/ / hot backup authentication information, which is consistent with each hot backup group

Auth_type PASS / / authentication type

Auth_pass 6666 / / password string

}

Virtual_ipaddress {/ / specify drift address (VIP), which can have more than one

192.168.80.100

}

}

Virtual_server 192.168.80.100 80 {/ / Virtual server address (VIP), port

Delay_loop 6 / / interval between health check-ups (seconds)

Lb_algo rr / / polling (rr) scheduling algorithm

Lb_kind DR / / Direct routing (DR) cluster operation mode

Persistence_timeout 60 / / connection hold time (seconds)

The protocol TCP / / application server uses TCP protocol

Real_server 192.168.80.30 80 {/ / the address and port of the first Web server node

Weight of weight 1 / / nod

TCP_CHECK {/ / Health check method

Connect_port 80 / / Target port for check

Connect_timeout 3 / / connection timeout (seconds)

Nb_get_retry 3 / / number of retries

Delay_before_retry 3 / / retry interval

}

}

Real_server 192.168.80.40 80 {/ / the address and port of the second Web server node

Weight 1

TCP_CHECK {

Connect_port 80

Connect_timeout 3

Nb_get_retry 3

Delay_before_retry 3

}

}

}

Save exit

[root@dd01 keepalived-1.4.2] # service keepalived start

[root@dd01 keepalived-1.4.2] # ip addr show dev ens33 / / verify the bound virtual address

[root@dd01 keepalived-1.4.2] # ipvsadm-L / / View LVS virtual server

[root@dd01 keepalived-1.4.2] # tail-f / var/log/messages

Step 2: configure the slave scheduler

[root@dd02 ~] # modprobe ip_vs / / load ip_vs module

[root@dd02] # rpm-ivh / mnt/Packages/ipvsadm-1.27-7.el7.x86_64.rpm / / install the management software ipvsadm

[root@dd02 ~] # yum-y install gcc gcc-c++ make popt-devel kernel-devel openssl-devel

[root@dd02 ~] # tar xzvf keepalived-1.4.2.tar.gz

[root@dd02 ~] cd keepalived-1.4.2/

[root@dd02 keepalived-1.4.2] #. / configure-prefix=/

[root@dd02 keepalived-1.4.2] # make & & make install

[root@dd02 keepalived-1.4.2] # cp keepalived/etc/init.d/keepalived / etc/init.d/

[root@dd02 keepalived-1.4.2] # systemctl enable keepalived

[root@dd02 keepalived-1.4.2] # vi / etc/keepalived/keepalived.conf

! Configuration File for keepalived

Global_defs {

Router_id LVS_02

}

Vrrp_instance VI_1 {

State BACKUP

Interface ens33

Virtual_router_id 51

Priority 105

Advert_int 1

Authentication {

Auth_type PASS

Auth_pass 6666

}

Virtual_ipaddress {

192.168.80.100

}

}

Virtual_server 192.168.80.100 80 {

Delay_loop 6

Lb_algo rr

Lb_kind DR

Persistence_timeout 60

Protocol TCP

Real_server 192.168.80.30 80 {

Weight 1

TCP_CHECK {

Connect_port 80

Connect_timeout 3

Nb_get_retry 3

Delay_before_retry 3

}

}

Real_server 192.168.80.40 80 {

Weight 1

TCP_CHECK {

Connect_port 80

Connect_timeout 3

Nb_get_retry 3

Delay_before_retry 3

}

}

}

Save exit

[root@dd02 keepalived-1.4.2] # service keepalived start

[root@dd02 keepalived-1.4.2] # ipvsadm-L

Step 3: verify the results

Dd01 master server keepalived service on status, verify dd02 slave server status

[root@dd02 keepalived-1.4.2] # ip addr show dev ens33

[root@dd02 keepalived-1.4.2] # tail-f / var/log/messages

/ / standby status simulates the failure of the master server, shuts down the keepalived service of the dd01 master server, and verifies the dd02 slave server status

[root@dd01 keepalived-1.4.2] # systemctl stop keepalived

/ / switch the standby to the host state

/ / A pair of hot standby machines have been built.

The third part configures the Web node server

Step 1: configure the SERVER AA server (192.168.80.30)

Configure the http service

/ / install http service

[root@aa ~] # yum install-y httpd

/ / Edit the main configuration file

[root@aa ~] # vi / etc/httpd/conf/httpd.conf

ServerName aa / / remove the "#" number and modify the host name

Save exit

/ / configure the default display web page

[root@aa ~] # cd / var/www/html/

[root@aa html] # echo "SERVER AA" > index.html

[root@aa html] # service httpd start / / restart the http service

/ / win7 verifies the http service

Visit http://192.168.80.30

Configure DR mode

[root@aa ~] # vi web.sh

#! / bin/bash

#

Ifconfig lo:0 192.168.80.100 broadcast 192.168.80.100 netmask 255.255.255.255 up

Route add-host 192.168.80.100 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

Sysctl-p & > / dev/null

Save exit

[root@aa ~] # sh web.sh / / execute script

[root@aa ~] # ifconfig / / View virtual interface

Step 2: configure the SERVER BB server (192.168.80.40)

Configure the http service

/ / install http service

[root@bb ~] # yum install-y httpd

/ / Edit the main configuration file

[root@bb ~] # vi / etc/httpd/conf/httpd.conf

ServerName bb / / remove the "#" number and modify the host name

Save exit

/ / configure the default display web page

[root@bb ~] # cd / var/www/html/

[root@bb html] # echo "SERVER BB" > index.html

[root@bb html] # service httpd start / / restart the http service

/ / win7 verifies the http service

Visit http://192.168.80.40

-configure DR mode-

[root@bb ~] # vi web.sh

#! / bin/bash

# hehe

Ifconfig lo:0 192.168.80.100 broadcast 192.168.80.100 netmask 255.255.255.255 up

Route add-host 192.168.80.100 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

Sysctl-p & > / dev/null

Save exit

[root@bb ~] # sh web.sh / / execute script

[root@bb ~] # ifconfig / / View virtual interface

Part IV testing LVS+Keepalived High availability Cluster

Verify that the cluster is built successfully if the web page content can be accessed normally from the drift address of the LVS+Keepalived cluster (192.168.80.100) in the client's browser.

Verify the polling work of two Web servers

Win7 accesses http://192.168.80.100

/ / since the connection retention time is set to 60 seconds, revisit the address one minute later.

/ / automatic polling to another Web server

Simulate the failure of the main scheduler and verify the results

[root@dd01 keepalived-1.4.2] # systemctl stop keepalived

/ / the main scheduler keepalived stops working

/ / automatically switch from the scheduler and continue to work

/ / win7 accesses http://192.168.80.100 to view the result

/ / one minute later, revisit http://192.168.80.100 to view the result

/ / A pair of computer hot backup has worked.

Simulate Web server aa failure

[root@bb ~] # service httpd stop / / stop the bb server

[root@dd01 keepalived-1.4.2] # tail-f / var/log/messages

Visit http://192.168.80.40

One minute later, revisit http://192.168.80.40

/ / unable to access, verification is successful

[root@bb ~] # service httpd start / / resume starting bb server

/ / View the scheduler log:

/ / the bb server has been successfully added to the server pool

/ / LVS+Keepalived has been successfully built and tested.

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