lvs cluster implements lvs Dr model and lvs NAT model

ipvsadm

The ipvsadm command is the management tool of lvs Cluster in the application layer. We can use this ipvsadm to manage the configuration of lvs. In fact, it implements the cluster service management: add, delete, change, RS management of cluster service: add, delete, change and view the cluster status.

Management cluster service: add, change, delete;

Add (A), change (E):
    ipvsadm -A|E -t|u|f service-address [-s scheduler] [-p [timeout]]
Delete:
    ipvsadm -D -t|u|f service-address
-t|u|f service-address: 
    -t: Port of TCP protocol, VIP: TCP port, such as - t 172.16.10.6:80
    -u: Port of UDP protocol, VIP: UDP port
    -f: firewall MARK, a number, can be defined by iptables
 [- s scheduler]: Specifies the scheduling algorithm of the cluster. The default is wlc

RS on Management Cluster: add, change, delete;

Add (a), change (e):
    ipvsadm -a|e -t|u|f service-address -r server-address [-g|i|m] [-w weight]
Delete:
    ipvsadm -d -t|u|f service-address -r server-address
 -R server address: rip[:port], indicating the IP address of RS
 Type lvs:
    -g: gateway, dr type
    -i: ipip, tun type
    -m: masquerade, nat type
 -w weight: weight

To view the status information of a cluster:

    ipvsadm -L|l [options]
options: 
    -c, --connection: Show current LVS Connect
    --timeout: List timeouts
    --daemon: 
    --stats: status information
    --rate: transmission speed
    --persistent-conn: Insist on linking up
    --sor: Sort the list.
    --nosort: Unsorted
    -n, --numeric: output IP Digital form of address and port

Saving and overloading rules:

Save and reload:
    ipvsadm -S = ipvsadm-save
    ipvsadm -R = ipvsadm-restore
 Clear all defined:
    ipvsadm -C
 Clear all data related counters:
    ipvsadm -Z [-t|u|f service-address]

The implementation of LVS NAT cluster

Simple flow chart:

Configure RS1:

[root@RS1 ~]# yum -y install httpd  #Install Apache
[root@RS1 ~]# systemctl stop firewalld.service  #Turn off firewall
[root@RS1 ~]# ifconfig eno16777736 172.16.0.10/24 up  #Configure NIC
[root@RS1 ~]# route add default gw 172.16.0.254  #Configuration routing
[root@RS1 ~]# vim /etc/httpd/conf/httpd.conf  #Set httpd
    Listen 8080
    ServerName localhost
[root@RS1 ~]# vim /var/www/html/index.html
    <h1> RS1 172.16.0.10 <h1>
[root@RS1 ~]# systemctl start httpd  #Enable httpd
[root@RS1 ~]# ss -tan
    LISTEN      0      128              :::8080                         :::*

Refer to RS1 for configuration of RS2.

Configure DR:

[root@DR ~]# yum -y install ipvsadm  #Install ipvsadm tool
[root@DR ~]# ifconfig eno16777736 10.0.0.1/24 up  #Configure vip
[root@DR ~]# ifconfig eno16777736:0 172.16.0.254/24 up  #Configure dip
[root@DR ~]# sysctl -a | grep ip_forward  #Make sure the core forwarding function is turned on
    net.ipv4.ip_forward = 1
[root@DR ~]# ipvsadm -A -t 10.0.0.1:80 -s rr  #Configure lvs cluster rules
[root@DR ~]# ipvsadm -a -t 10.0.0.1:80 -r 172.16.0.10:8080 -m
[root@DR ~]# ipvsadm -a -t 10.0.0.1:80 -r 172.16.0.11:8080 -m
[root@DR ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.1:80 rr
  -> 172.16.0.10:8080             Masq    1      0          0         
  -> 172.16.0.11:8080             Masq    1      0          0

Client test:

# The scheduling algorithm uses rr and polling mode, so the ratio when calling RS is 1:1
[root@client ~]# for i in {1..20}; do curl http://10.0.0.1; done
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>
<h1> RS1 172.16.0.10 </h1>
<h1> RS2 172.16.0.11 </h1>

The implementation of LVS Dr cluster

Simple flow chart:

Configure RS1:

[root@RS1 ~]# ifconfig eno16777736 10.0.0.11/24 up  #Configure NIC
[root@RS1 ~]# ifconfig lo:0 10.0.0.1 netmask 255.255.255.255 broadcast 10.0.0.1 up
[root@RS1 ~]# route add -host 10.0.0.1 dev lo:0  #Configuration routing
[root@RS1 ~]# echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore  #Set arp response
[root@RS1 ~]# echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
[root@RS1 ~]# echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
[root@RS1 ~]# echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
[root@RS1 ~]# vim /etc/httpd/conf/httpd.conf  #Set httpd
    Listen 80
[root@RS1 ~]# vim /var/www/html/index.html
    <h1> RS1 10.0.0.11<h1>
[root@RS1 ~]# systemctl start httpd  #Enable httpd
[root@RS1 ~]# ss -tan
    LISTEN      0      128              :::8080                         :::*

Refer to RS1 for configuration of RS2.

Configure DR:

[root@DR ~]# ifconfig eno16777736 10.0.0.2/24 up  #Configure dip
[root@DR ~]# ifconfig eno16777736:0 10.0.0.1 netmask 255.255.255.255 broadcast 10.0.0.1 up  #Configure vip
[root@DR ~]# ipvsadm -A -t 10.0.0.1:80 -s wrr  #Configure lvs cluster rules
[root@DR ~]# ipvsadm -a -t 10.0.0.1:80 -r 10.0.0.11 -g -w 1
[root@DR ~]# ipvsadm -a -t 10.0.0.1:80 -r 10.0.0.12 -g -w 2
[root@DR ~]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  10.0.0.1:80 wrr
  -> 10.0.0.11:80                 Route   1      0          0         
  -> 10.0.0.12:80                 Route   2      0          0

Client test:

# Scheduling algorithm use wrr，The specific gravity is 1.:2
[root@client ~]# for i in {1..20}; do curl http://10.0.0.1; done
<h1> RS1 10.0.0.11 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS1 10.0.0.11 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.11 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS1 10.0.0.11 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.11 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS1 10.0.0.11 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.11 </h1>
<h1> RS2 10.0.0.12 </h1>
<h1> RS2 10.0.0.12 </h1>

RS1 configuration script reference:

#!/bin/bash
#
vip=10.0.0.1
rip=10.0.0.11
mask1=255.255.255.255
mask2=255.255.255.0
case $1 in
start)
    echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
    ifconfig eno16777736 $rip netmask $mask2 up
    ifconfig lo:0 $vip netmask $mask1 broadcast $vip up
    route add -host $vip dev lo:0
    ;;
stop)
    ifconfig lo:0 down
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
    ;;
*) 
    echo "Usage $(basename $0) start|stop"
    exit 1
    ;;
esac

DR configuration script reference:

#!/bin/bash
#
vip=10.0.0.1
mask1=255.255.255.255
dip=10.0.0.2
mask2=255.255.255.0
port=80
rs1=10.0.0.11
rs2=10.0.0.12
scheduler='wrr'
type='-g'
case $1 in
start)
    ifconfig eno16777736 $dip netmask $mask2 up
    ifconfig eno16777736:0 $vip netmask $mask1 broadcast $vip up

    ipvsadm -A -t ${vip}:${port} -s $scheduler
    ipvsadm -a -t ${vip}:${port} -r ${rs1} $type -w 1
    ipvsadm -a -t ${vip}:${port} -r ${rs2} $type -w 2
    ;;
stop)
    ipvsadm -C
    ifconfig eno16777736:0 down
    ;;
*)
    echo "Usage $(basename $0) start|stop"
    exit 1
    ;;
esac

Posted by frao_0 on Fri, 31 Jan 2020 02:54:13 -0800

Programmer Group

lvs cluster implements lvs Dr model and lvs NAT model

ipvsadm

The implementation of LVS NAT cluster

Simple flow chart:

Configure RS1:

Refer to RS1 for configuration of RS2.

Configure DR:

Client test:

The implementation of LVS Dr cluster

Simple flow chart:

Configure RS1:

Refer to RS1 for configuration of RS2.

Configure DR:

Client test:

RS1 configuration script reference:

DR configuration script reference:

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