Latest revision as of 08:39, 5 August 2020

Linux Test setup, it has been tested on

Debian 8
Apache 2.4
Hostname used for the test: myLVS-LinuxClient

System settings to configure the loop back adapter

To make the change permanent you may edit /etc/sysctl.conf and add:

net.ipv4.conf.eth0.arp_ignore = 1
net.ipv4.conf.eth0.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2

Apply:

sysctl -p

To make it applied immediately you can set:

root@myLVS-LinuxClient:~# echo "1" > /proc/sys/net/ipv4/conf/eth0/arp_ignore
root@myLVS-LinuxClient:~# echo "2" > /proc/sys/net/ipv4/conf/eth0/arp_announce
root@myLVS-LinuxClient:~# echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore
root@myLVS-LinuxClient:~# echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce

Note: If the ifconfig command is missing then install it by using:

# apt-get install net-tools

Add to /etc/rc.local to automatic load the loop back adapter:

/sbin/ifconfig lo:0 192.168.2.220 -arp netmask 255.255.255.255 up

ifconfig should look like:

root@myLVS-LinuxClient:~# ifconfig
eth0     Link encap:Ethernet  HWaddr 08:00:27:89:f3:8d
         inet addr:192.168.2.222  Bcast:255.255.255.255  Mask:255.255.255.0
         inet6 addr: fe80::a00:27ff:fe89:f38d/64 Scope:Link
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:1646 errors:0 dropped:2 overruns:0 frame:0
         TX packets:356 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:153233 (149.6 KiB)  TX bytes:105801 (103.3 KiB)
lo       Link encap:Local Loopback
         inet addr:127.0.0.1  Mask:255.0.0.0
         inet6 addr: ::1/128 Scope:Host
         UP LOOPBACK RUNNING  MTU:65536  Metric:1
         RX packets:32 errors:0 dropped:0 overruns:0 frame:0
         TX packets:32 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:1920 (1.8 KiB)  TX bytes:1920 (1.8 KiB)
lo:0     Link encap:Local Loopback
         inet addr:192.168.2.220  Mask:255.255.255.255
         UP LOOPBACK RUNNING  MTU:65536  Metric:1

Testing the loop back adapter

Switch off the first (Windows) client to make Linux as the only web server

The new myLVS overview should now show the disabled (Windows) server marked with a red cross:

Use a network client and open the URL http://192.168.2.220, we should now see the result of web02 (because web01 is off)
There should be the Linux/Debian default web page

Where to go next

Go here: Setup summary

@@ Line 1: / Line 1: @@
+{| width="50%"  <-- Test !-->
+| valign="top" |
 Linux Test setup, it has been tested on
 *Debian 8
 *Apache 2.4
-*Hostname used for the test: myLVS-LinuxClient
+*Hostname used for the test: '''myLVS-LinuxClient'''
+| valign="top" |
+[[File:myLVS-HL-Linux.png|240px]]<br><br>
+|}
 =System settings to configure the loop back adapter=
-Edit '''/etc/sysctl.conf''' and add:
+To make the change permanent you may edit '''/etc/sysctl.conf''' and add:
   net.ipv4.conf.eth0.arp_ignore = 1
   net.ipv4.conf.eth0.arp_announce = 2
@@ Line 14: / Line 19: @@
   net.ipv4.conf.all.arp_announce = 2
-Either unload your network adapter and apply the above settings or simply reboot.
+Apply:
+ sysctl -p
+To make it applied immediately you can set:
+ root@myLVS-LinuxClient:~# '''echo "1" > /proc/sys/net/ipv4/conf/eth0/arp_ignore'''
+ root@myLVS-LinuxClient:~# '''echo "2" > /proc/sys/net/ipv4/conf/eth0/arp_announce'''
+ root@myLVS-LinuxClient:~# '''echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore'''
+ root@myLVS-LinuxClient:~# '''echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce'''
+'''Note: If the ifconfig command is missing then install it by using:'''
+ # apt-get install net-tools
 Add to '''/etc/rc.local''' to automatic load the loop back adapter:
@@ Line 38: / Line 54: @@
            RX bytes:1920 (1.8 KiB)  TX bytes:1920 (1.8 KiB)
   lo:0     Link encap:Local Loopback
-           inet addr:192.168.2.220  Mask:255.255.255.255
+           inet addr:'''192.168.2.220'''  Mask:'''255.255.255.255'''
            UP LOOPBACK RUNNING  MTU:65536  Metric:1
 =Testing the loop back adapter=
+<br>Switch off the first (Windows) client to make Linux as the only web server<br>
-Switch off the first (Windows) client<br>
 [[File:04-02-01-myLVSOff.png|640px]]<br><br>
+<br>The new myLVS overview should now show the disabled (Windows) server marked with a red cross:<br>
-The new myLVS overview should now show the disabled by marked with a red cross:<br>
 [[File:04-02-02-myLVS02on.png|640px]]<br><br>
@@ Line 54: / Line 66: @@
 There should be the Linux/Debian default web page<br>
 [[File:04-01-01-DebianDefWeb.png|640px]]<br><br>
+=Where to go next=
+<br>
+*Go here: [[Setup summary]]

Setup linux test client: Difference between revisions

Latest revision as of 08:39, 5 August 2020

System settings to configure the loop back adapter

Testing the loop back adapter

Where to go next

Navigation menu