Vmware Esx Host – Network Yapılandırması

How to configure networking from the Service Console command line

How can I get networking back up for my ESX Server host when I have access only to the service console?

1. Ensure the network adapter you want to use is currently connected
   
   [root@server root]# esxcfg-nics –l
   Name    PCI      Driver      Link Speed    Duplex Description
   vmnic0  06:00.00 tg3         Up   1000Mbps Full   Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet
   vmnic1  07:00.00 tg3         Up   1000Mbps Full   Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet
   
   Up indicates that the network adapter is available and functioning. 

1. List the current virtual switches
   
   [root@server root]# esxcfg-vswitch –l
   Switch Name    Num Ports   Used Ports  Configured Ports  Uplinks
   vSwitch0       32          3           32                vmnic0
   
     PortGroup Name      Internal ID    VLAN ID  Used Ports  Uplinks
     VM Network          portgroup2     0        0           vmnic0
   
   In the above example, there exists a virtual machine network named “VM Network” and no Service Console portgroup. For illustration, we will create a new virtual switch and place the service console portgroup on it.


2. Create a new virtual switch:
   
   [root@server root]# esxcfg-vswitch –a vSwitch1


3. Create the Service Console portgroup on this new virtual switch:
   
   [root@server root]# esxcfg-vswitch –A “Service Console” vSwitch1
   
   Because there is a space in the name we chose (Service Console), we must enclose it in quotation marks.


4. Uplink vmnic1 to the new virtual switch:
   
   [root@server root]# esxcfg-vswitch –L vmnic1 vSwitch1


5. If you need to assign a VLAN, use the command:
   
   [root@server root]# esxcfg-vswitch -v <VLAN> -p “Service Console” vSwitch0
   
   where <VLANID> is the VLAN number. A zero here specifies no VLAN.


6. Verify the new virtual switch configuration:
   
   [root@server root]# esxcfg-vswitch –l
   
   Switch Name    Num Ports   Used Ports  Configured Ports  Uplinks
   vSwitch0       32          3           32                vmnic0
   
     PortGroup Name      Internal ID    VLAN ID  Used Ports  Uplinks
     Service Console     portgroup5     0        1           vmnic0
   
   Switch Name    Num Ports   Used Ports  Configured Ports  Uplinks
   vSwitch1       64          1           64                vmnic1
   
     PortGroup Name      Internal ID    VLAN ID  Used Ports  Uplinks
     Service Console     portgroup14    0        1           vmnic1


7. Create the vswif (Service Console) interface. For example:
   
   [root@server root]# esxcfg-vswif –a vswif0 –i 192.168.1.10 –n 255.255.255.0 –p “Service Console”
   [‘Vnic’ warning] Generated New Mac address, 00:50:xx:xx:xx:xx for vswif0
   
   Nothing to flush.


8. Verify the configuration:
   
   [root@esx]# esxcfg-vswif –l
   Name    Port Group       IP Address    Netmask  Broadcast Enabled  DHCP
   vswif0  Service Console 192.168.1.10  255.255.255.0    192.168.1.255  true      false

Verifying ESX Server host networking configuration on the service console

To verify the current networking configuration is valid and correct:

1. Verify the format and content of /etc/hosts.
   
   The hosts file is expected to have the following format:
   
   127.0.0.1       localhost.localdomain localhost
   192.168.1.10    server.domain.com server


2. Verify the contents of /etc/sysconfig/network. Confirm that the proper values for your environment exist for the fully qualified hostname and gateway. Consult your network administrator if you are unsure. For example:
   
   NETWORKING=yes
   HOSTNAME=server.domain.com
   GATEWAY=192.168.1.1
   GATEWAYDEV=vswif0


3. Verify that /etc/sysconfig/network-scripts/ifcfg-vswif0 has the correct settings for IP address (IPADDR), subnet mask (NETMASK), and network (NETWORK). Consult your network administrator if you are unsure. For example:
   
   DEVICE=vswif0
   BOOTPROTO=static
   BROADCAST=192.168.1.255
   IPADDR=192.168.1.10
   NETMASK=255.255.255.0
   NETWORK=192.168.1.0
   ONBOOT=yes
   PORTGROUP=”Service Console”
   MACADDR=00:50:56:4a:66:ba


4. Run the following command to display the routing table:
   
   [root@server root]# route –n
   
   You will see output similar to the following:
   
   Kernel IP routing table
   Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
   192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 vswif0
   169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 vswif0
   0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 vswif0
   
   Ensure that the second column of the row flagged with UG matches the gateway address for your environment.


5. Verify the DNS information in /etc/resolv.conf is correct for your environment.
   
   search domain.com
   nameserver 192.168.1.2
   nameserver 192.168.1.3


6. Verify network connectivity between systems

Note: Changes to the network and ifcfg-vswif0 files require a restart of the network service. Type the following command and press Enter to restart the network service:

[root@server root]# service network restart

Testing network connectivity with the Ping command

Testing with Ping from a Windows Host

To initiate a ping test from a Windows host:

1. Click Start>Run.


2. Type cmd in the run field.


3. Click OK.


4. In the command prompt window, type ping <server>, where <server> is the hostname or IP address of the server that you want to ping.


5. Press Enter.

A successful ping response is similar to the following: 

C:>ping server

Pinging server with 32 bytes of data:

Reply from server: bytes=32 time<1ms TTL=64
Reply from server: bytes=32 time<1ms TTL=64
Reply from server: bytes=32 time<1ms TTL=64
Reply from server: bytes=32 time<1ms TTL=64

Ping statistics for server:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

C:>

An unsuccessful ping response is similar to the following:

C:>ping server

Pinging server with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for server:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:>

Note: If you do not see a response when pinging by the hostname of the server, initiate a ping to the IP address. Initiating a ping to the IP address allows you to determine if the problem is a result of an issue with hostname resolution.

Testing with Ping from a Linux Host

To initiate a ping test from a Linux host:

1. Open a Terminal to the Linux command shell.


2. In the command shell window type ping <server>, where <server> is the hostname or IP address of the server that you want to ping.


3. Press Enter.
   
   Note: To stop the ping, press Ctrl + C.

A successful ping response is similar to the following: 

[root@server]$ ping server
PING server (10.0.0.1) 56(84) bytes of data.
64 bytes from server (10.0.0.1): icmp_seq=0 ttl=64 time=0.025 ms
64 bytes from server (10.0.0.1): icmp_seq=1 ttl=64 time=0.029 ms
64 bytes from server (10.0.0.1): icmp_seq=2 ttl=64 time=0.032 ms
64 bytes from server (10.0.0.1): icmp_seq=3 ttl=64 time=0.028 ms

— server ping statistics —
4 packets transmitted, 4 received, 0% packet loss, time 3092ms
rtt min/avg/max/mdev = 0.025/0.028/0.032/0.005 ms, pipe 2
[root@server]$

An unsuccessful ping response is similar to the following:

[root@server]$ ping server
PING server (10.0.0.1) 56(84) bytes of data.

— server ping statistics —
4 packets transmitted, 0 received, 100% packet loss, time 3017ms

[root@server]$

Note: If you do not see a response when pinging by the hostname of the server, initiate a ping to the IP address. Initiating a ping to the IP address allows you to determine if the problem is a result of an issue with hostname resolution.

Testing with Ping from an ESX Server Console

To initiate a ping test from the console of an ESX Server host:

1. Press Alt + F1 to access the ESX Server login prompt.


2. Login to the ESX Server as root.


3. In the command shell type ping <server>, where <server> is the hostname or IP address of the server that you want to ping.


4. Press Enter.
   
   Note: To stop the ping, press Ctrl + C.

A successful ping response is similar to the following: 

[root@server]$ ping server
PING server (10.0.0.1) 56(84) bytes of data.
64 bytes from server (10.0.0.1): icmp_seq=0 ttl=64 time=0.025 ms
64 bytes from server (10.0.0.1): icmp_seq=1 ttl=64 time=0.029 ms
64 bytes from server (10.0.0.1): icmp_seq=2 ttl=64 time=0.032 ms
64 bytes from server (10.0.0.1): icmp_seq=3 ttl=64 time=0.028 ms

— server ping statistics —
4 packets transmitted, 4 received, 0% packet loss, time 3092ms
rtt min/avg/max/mdev = 0.025/0.028/0.032/0.005 ms, pipe 2
[root@server]$

An unsuccessful ping response is similar to the following:

[root@server]$ ping server
PING server (10.0.0.1) 56(84) bytes of data.

— server ping statistics —
4 packets transmitted, 0 received, 100% packet loss, time 3017ms

[root@server]$

Note: If you do not see a response when pinging by the hostname of the server, initiate a ping to the IP address. Initiating a ping to the IP address allows you to determine if the problem is a result of an issue with hostname resolution.

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