LVS load balancing Cluster-practical articles

LVS load balancing cluster

Environmental preparation:

CentOS 7-1: scheduler, gateway (requires two network cards) outside: 12.0.0.1 inside: 192.168.200.1

CentOS 7-2: website Server (Apache) 192.168.200.110

CentOS 7-3: website server (Apache) 192.168.200.120

CentOS 7-4: provides shared storage 192.168.200.130

Win7-1: client 12.0.0.12

Pre-operation of yum online installation:

1. Operations of the shared storage server CentOS 7-4:

[root@localhost ~] # rpm-Q nfs-utilsnfs-utils-1.3.0-0.48.el7.x86_64 [root@localhost ~] # rpm-Q rpcbind rpcbind-0.2.0-42.el7.x86_64

two。 Node servers CentOS 7-2 and 7-3 two node servers:

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

3. Scheduler Gateway CentOS 7-1 Operation:

/ / to first add a network adapter to become two network cards [root@localhost ~] # yum install ipvsadm-y shared storage server CentOS 7-4 CentOS / change the network card to host-only mode [root@localhost ~] # vim / etc/sysconfig/network-scripts/ifcfg-ens33BOOTPROTO= "static" / / change dhcp to staticDEVICE= "ens33" ONBOOT= "yes" IPADDR=192.168.200.130 / / insert under the last line: IP, subnet Enter: wq save exit [root@localhost ~] # service network restart Restarting network (via systemctl): [OK] [root@localhost ~] # systemctl stop firewalld.service [root@localhost ~] # setenforce 0 [root@localhost ~] # systemctl start nfs.service [root@localhost ~] # systemctl status nfs.service ● nfs-server.service-NFS server and services after the modification of the gateway is completed Loaded: loaded (/ usr/lib/systemd/system/nfs-server.service) Disabled; vendor preset: disabled) Active: active (exited) since II 2019-11-26 17:42:05 CST; 11s ago. Omit multiple lines and the status is Active. Normal [root@localhost ~] # systemctl start rpcbind.service [root@localhost ~] # systemctl status rpcbind.service ● rpcbind.service-RPC bind service Loaded: loaded (/ usr/lib/systemd/system/rpcbind.service; indirect; vendor preset: enabled) Active: active (running) since II 2019-11-26 17:40:23 CST; 4min 26s ago. Omit multiple lines Status: Active indicates normal [root@localhost ~] # vim / etc/exports/usr/share * (ro,sync) / opt/accp 192.168.200.0Accord 24 (rw,sync) / opt/benet 192.168.200.0Universe 24 (rw) Sync) / / enter: wq save and exit [root@localhost ~] # cd / opt/ [root@localhost opt] # mkdir benet accp [root@localhost opt] # chmod 777 accp/ benet/ upgrade permissions [root@localhost opt] # exportfs-rv / / to publish exporting 192.168.200.0/24:/opt/benetexporting 192.168.200.0/24:/opt/accpexporting *: / usr/share node Operation on the server (CentOS 7-2): [root@localhost ~] # vim / etc/sysconfig/network-scripts/ifcfg-ens33BOOTPROTO= "static" / / change dhcp to staticDEVICE= "ens33" ONBOOT= "yes" IPADDR=192.168.200.110 / / insert: IP under the last line Subnet Enter: wq save and exit [root@localhost ~] # service network restart Restarting network (via systemctl): [OK] [root@localhost ~] # systemctl stop firewalld.service [root@localhost ~] # setenforce 0 [root@localhost ~] # systemctl start httpd.service [root@localhost ~] # netstat-ntap | grep 80 tcp6 00: 80:: * LISTEN 7315/httpd / / set the network adapter to host [root@localhost ~] # ping 192.168.200.130PING 192.168.200.130 (192.168.200.130) 56 (84) bytes of data.64 bytes from 192.168.200.130: icmp_seq=1 ttl=64 time=0.754 ms64 bytes from 192.168.200.130: icmp_seq=2 ttl=64 time=0.368 ms64 Bytes from 192.168.200.130: icmp_seq=3 ttl=64 time=0.398 ms [root@localhost ~] # showmount-e 192.168.200.130Export list for 192.168.200.130:/usr/share * / opt/benet 192.168.200.0/24/opt/accp 192.168.200.0Compact 24 [root@localhost ~] # mount.nfs 192.168.200.130:/opt/accp / var/www/html/ mount [root@localhost ~] # Cd / var/www/html/ [root@localhost html] # echo "this is accp web" > index.html / / write home page content

At this point, go back to the storage server CentOS 7-4 to see if this file is available:

[root@localhost ~] # cd / opt/ [root@localhost opt] # lsaccp benet rh [root@localhost opt] # cd accp/ [root@localhost accp] # lsindex.html [root@localhost accp] # cat index.html this is accp web// has our new index.html file at this time

At this point, use the Firefox browser on the CentOS 7-2 node server to enter: 127.0.0.1 to see if the web page content we wrote can be displayed:

Operation on the node server (CentOS 7-3): [root@localhost ~] # vim / etc/sysconfig/network-scripts/ifcfg-ens33BOOTPROTO= "static" / / change dhcp to staticDEVICE= "ens33" ONBOOT= "yes" IPADDR=192.168.200.120 / / insert: IP, subnet under the last line Enter: wq save and exit [root@localhost ~] # service network restart Restarting network (via systemctl): [OK] [root@localhost ~] # systemctl stop firewalld.service [root@localhost ~] # setenforce 0 [root@localhost ~] # systemctl start httpd.service [root@localhost ~] # netstat-ntap | grep 80 tcp6 00: : 80: * LISTEN 7315/httpd / / set the network adapter to host-only [root@localhost ~] # ping 192.168.200.130PING 192.168.200.130 (192.168.200.130) 56 (84) bytes of data.64 bytes from 192.168.200.130: icmp_seq=1 ttl=64 time=0.532 ms64 bytes from 192.168.200.130: icmp_seq=2 ttl=64 time=1.01 ms64 bytes from 192.168.200.130: icmp_seq=3 ttl=64 time=0.940 ms [root@localhost ~] # showmount-e 192.168.200.130Export list for 192.168.200.130:/usr/share * / opt/benet 192.168.200.0/24/opt/accp 192.168.200.0Accord 24 [root@localhost ~] # mount.nfs 192.168.200.130:/opt/benet / var/www/html/ [root@localhost ~] # cd / var/www/html/ [root @ localhost html] # echo "this is benet web" > index.html

At this point, go back to the storage server CentOS 7-4 to see if this file is available:

[root@localhost ~] # cd / opt/ [root@localhost opt] # lsaccp benet rh [root@localhost opt] # cd accp/ [root@localhost accp] # lsindex.html [root@localhost accp] # cat index.html this is benet web// at this time we have our new index.html file verification: use Firefox on CentOS 7-3 node server to enter: 127.0.0.1 to see if we can display the web content we wrote.

Scheduling, operation of gateway server CentOS 7-1: [root@localhost ~] # cd / etc/sysconfig/network-scripts/ [root@localhost network-scripts] # cp ifcfg-ens33 ifcfg-ens36 [root@localhost network-scripts] # vim ifcfg-ens36BOOTPROTO= "static" / / change dhcp to staticNAME= "ens36" / / change name to ens36UUID number delete DEVICE= "ens36" / / change name to ens36ONBOOT= "yes" IPADDR=12.0.0.1 / / insert: IP under the last line Enter: wq save exit [root@localhost network-scripts] # vim ifcfg-ens33BOOTPROTO= "static" / / change dhcp to staticDEVICE= "ens33" ONBOOT= "yes" / / insert: IP under the last line after the subnet NETMASK=255.255.255.0// modification is completed After the subnet IPADDR=192.168.200.1NETMASK=255.255.255.0// modification is completed, enter: wq save exit [root@localhost network-scripts] # service network restart Restarting network (via systemctl): [OK] [root@localhost network-scripts] # vim / etc/sysctl.conf / / press o on the last line to insert net.ipv4.ip_forward=1// after modification is completed, enter: wq save exit [ Root@localhost network-scripts] # sysctl-pnet.ipv4.ip_forward = 1 [root@localhost network-scripts] # iptables-t nat-F [root@localhost network-scripts] # iptables-F [root@localhost network-scripts] # iptables-t nat-A POSTROUTING-o ens36-s 192.168.200.0Universe 24-j SNAT-- to-source 12.0.0.1win7-1 verify forwarding: first set the network card to host-only mode The Nic is configured with a static address and the firewall is turned off:

Load the LVS kernel module: [root@localhost network-scripts] # modprobe ip_ vs [root @ localhost network-scripts] # cat / proc/net/ip_vsIP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConn startup service: (note: in CentOS 7, you must first save in the startup service, otherwise an error will be reported! ) [root@localhost network-scripts] # ipvsadm-- save > / etc/sysconfig/ipvsadm [root@localhost network-scripts] # systemctl start ipvsadm.service Writing configuration rules: [root@localhost network-scripts] # cd / opt/ [root@localhost opt] # vim nat.shrunk / / clear all records in the kernel virtual server table ipvsadm-A-t 12.0.0.1 ipvsadm-s rr / / Add a new virtual server ipvsadm-a-t 12.0.0.1 ipvsadm 80-r 192.168.200.110 mipvsadm// 80-mipvsadm-a-t 12.0.0.1 mipvsadm// input: wq save exit [root@localhost opt] # source nat.shIP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags-> RemoteAddress:Port Forward Weight ActiveConn InActConnTCP localhost.localdomain:http rr-> 129.168.200.110:http Masq 100-> 129.168.200.120:http Masq 100 Authentication: access 12.0.0.1 using win7-1 client terminal See if it can be successful:

Can be accessed at this time, indicating that the LVS load balancer cluster successfully provides services, and the experiment is successful!