运维高级内容---LVS实验

**1.**LVS 两个网关 ：仅主机模式192.168.0.100 NAT模式172.25.254.100

(lvs中仅主机模式和NAT模式处于不同VLAN，网段不同)不同网段通信：内核

配置ip、主机名,挂载仓库好后：

vim /etc/NetworkManager/system-connections/eth0.nmconnection #NAT模式的eth0

[connection]
id=eth0
type=ethernet
interface-name=eth0

[ipv4]
address1=172.25.254.100/24,172.25.254.2
method=manual
dns=114.114.114.114;

vim /etc/NetworkManager/system-connections/eth1.nmconnection #仅主机模式的eth1

[connection]
id=eth1
type=ethernet
interface-name=eth1

[ipv4]
address1=192.168.0.100/24
method=manual

nmcli connection reload

nmcli connection up eth0

nmcli connection up eth1

lvs中打开内核路由功能：

sysctl -a | grep ip_forward                      #会显示三行，把net.ipv4.ip_forward值改为1
    net.ipv4.ip forward =0
    net.ipv4.ip forward update priority= 1
    net.ipv4.ip forward use pmtu = 0

vim /etc/sysctl.conf

net.ipv4.ip_forward=1 #添加这一行并将值改为1，保存退出

sysctl -p

配置HTTP服务：

yum install httpd -y #才能curl另外两台机子

systemctl enable --now httpd

在lvs的机子测试：

curl 192.168.0.10

curl 192.168.0.20

dnf install ipvsadm -y #lvs中安装lvs软件

安装后不能启服务，它会记录你当下编写的策略，但是重新开机后又没有了

ipvsadm -A -t 172.25.254.100:80 -s rr #rr轮询调度，后续for时调度该IP80端口下的两个 ip，轮询调度先调度10主机一遍，再调度20主机一遍，如此反复 t:tcp协议/u：udp协议 A：添加/ D:删除 s：调度算法 ipvsadm -C :添加的全部删除，清空

ipvsadm -Ln

ipvsadm -a -t 172.25.254.100:80 -r 192.168.0.10:80 -m

ipvsadm -Ln

ipvsadm -a -t 172.25.254.100:80 -r 192.168.0.20:80 -m

ipvsadm -Ln

ipvsadm-save

打开另外一台机子（第四台主机）进行测试：

for i in {1..10} #轮询10遍

do

curl 172.25.254.100

done

**2.**webserver1 仅主机模式192.168.0.10

vim /etc/NetworkManager/system-connections/eth0.nmconnection

<span style="background-color:#f8f8f8"><span style="color:#333333">[connection]
id=eth0
type=ethernet
interface-name=eth0
[ipv4]
address1=192.168.0.10/24,192.168.0.100
method=manual
dns=114.114.114.114;</span></span>

nmcli connection reload

nmcli connection up eth0

yum install httpd -y #才有/var/www/html路径，才能echo

systemctl enable --now httpd

echo webserver - 192.168.0.10 >> /var/www/html/index.html

**3.**webserver2 仅主机模式192.168.0.20

vim /etc/NetworkManager/system-connections/eth0.nmconnection

[connection]
id=eth0
type=ethernet
interface-name=eth0

[ipv4]
address1=192.168.0.20/24,192.168.0.100
method=manual
dns=114.114.114.114;

nmcli connection reload

nmcli connection up eth0

route -n

yum install httpd -y #才有/var/www/html路径，才能echo

systemctl enable --now httpd

echo webserver - 192.168.0.10 >> /var/www/html/index.html