第6周

1、实现LVS+keepalived高可用集群
2、安装配置kvm虚拟机，并创建虚拟机

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1、实现LVS+keepalived高可用集群

1.1 环境

Keepalived主节点、LVS 1为同一主机　　　　#10.0.0.7
Keepalived从节点、LVS 2为同一主机　　　　#10.0.0.100
Real_server1　　　　#10.0.0.27
Real_server2　　　　#10.0.0.37
VIP　　　　　　　　　#10.0.0.248

1.2 Keepalived主节点配置

global_defs {
   ...
   vrrp_iptables
}

vrrp_instance test_web {
    state MASTER
    interface eth0
    virtual_router_id 41
    priority 100
    advert_int 1
    vrrp_strict
    authentication {
        auth_type PASS
        auth_pass 1q2w3e4r
    }
    virtual_ipaddress {
        10.0.0.248/24 dev eth0 label eth0:0
    }
}

virtual_server 10.0.0.248 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
    #persistence_timeout 120
    protocol TCP
    #sorry_server 192.168.200.200 1358
    
    real_server 10.0.0.27 80 {
        weight 1
        #notify_up "/etc/keepalived/notify.sh rsup"    
        #notify_down "/etc/keepalived/notify.sh rsup"HTTP_GET {
            url { 
              path /test.html
              status_code 200
            }
            #connect_ip 10.0.0.127
            #connect_port 8080
            #bindto 10.0.0.17
            #bind_port 12345
            connect_timeout 5
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 10.0.0.37 80 {
        weight 1
        TCP_CHECK {
            connect_ip 10.0.0.37
            connect_port 80
            #bindto 10.0.0.17
            #bind_port 12345
            connect_timeout 3
            delay_before_retry 3
        }
    }
}

#启动服务
# systemctl enable --now keepalived

1.3 Keepalived从节点配置

global_defs {
   ...
   vrrp_iptables
}

vrrp_instance test_web {
    state BACKUP
    interface eth0
    virtual_router_id 41
    priority 80
    advert_int 1
    vrrp_strict
    authentication {
        auth_type PASS
        auth_pass 1q2w3e4r
    }
    virtual_ipaddress {
        10.0.0.248/24 dev eth0 label eth0:0
    }
}

virtual_server 10.0.0.248 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
    #persistence_timeout 120
    protocol TCP
    #sorry_server 192.168.200.200 1358
    
    real_server 10.0.0.27 80 {
        weight 1
        #notify_up "/etc/keepalived/notify.sh rsup"    
        #notify_down "/etc/keepalived/notify.sh rsup"HTTP_GET {
            url { 
              path /test.html
              status_code 200
            }
            #connect_ip 10.0.0.127
            #connect_port 8080
            #bindto 10.0.0.17
            #bind_port 12345
            connect_timeout 5
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 10.0.0.37 80 {
        weight 1
        TCP_CHECK {
            connect_ip 10.0.0.37
            connect_port 80
            #bindto 10.0.0.17
            #bind_port 12345
            connect_timeout 3
            delay_before_retry 3
        }
    }
}

#启动服务
# systemctl enable --now keepalived

1.4 Real_server1、2配置

#yum安装nginx
# yum -y install nginx

#准备测试资源
# hostname -I > /usr/share/nginx/html/index.html

#配置VIP
# ip addr add dev lo label lo:0 10.0.0.248/32

#更改内核参数
# vi /etc/sysctl.conf
 net.ipv4.conf.all.arp_ignore = 1
 net.ipv4.conf.lo.arp_ignore = 1
 net.ipv4.conf.all.arp_announce = 2
 net.ipv4.conf.lo.arp_announce = 2
# sysctl -p

#启动服务
# systemctl enable --now nginx

1.5 客户端测试

# tail -n1 /etc/hosts
 10.0.0.248    www.testou.com
# while :; do curl http://www.testou.com;sleep 0.5;done
 10.0.0.27 
 10.0.0.37 
 10.0.0.27 
 10.0.0.37

2、安装配置kvm虚拟机，并创建虚拟机

2.1 创建桥接虚拟机

#创建桥接网卡
# nmcli connection add ifname br0 con-name br0 type bridge ipv4.method manual ipv4.addresses 10.0.0.7/24 ipv4.gateway 10.0.0.2 ipv4.dns 223.5.5.5,180.76.76.76 ipv4.ignore-auto-dns yes
# nmcli connection add ifname eth0 con-name br0-eth0 type bridge-slave master br0
# nmcli connection delete eth0 && ip link set br0 up

#安装KVM工具包
# yum -y install qemu-kvm qemu-kvm-tools libvirt libvirt-client virt-manager virt-install
# systemctl enable --now libvirtd

#创建磁盘
# qemu-img create -f qcow2 /var/lib/libvirt/images/Centos7.9.qcow2 10G

#创建桥接虚拟机
# virt-install --virt-type kvm \
--name centos7 \
--vcpus 1,maxvcpus=10 --memory 1024,maxmemory=4096 \
--disk path=/var/lib/libvirt/images/Centos7.9.qcow2 \
--network bridge=br0 \
--graphics vnc,listen=0.0.0.0 \
--noautoconsole \
--autostart \
--cdrom=/usr/local/src/CentOS-7-x86_64-Everything-2009.iso

#打开virt-manager安装
# virt-manager

#查看所有虚拟机
# virsh list --all        #不加--all只显示开机的虚拟机

#开启虚拟机
# virsh start centos7
#关闭虚拟机
# virsh shutdown centos7