Configuring DHCP¶
Scenarios¶
If a private image is created from an ECS or external image file and the VM where the ECS or external image file is located is configured with a static IP address, you need to configure DHCP so that the new ECSs created from the private image can dynamically obtain an IP address.
The configuration method varies depending on OSs.
Note
When registering an external image file as a private image, configure DHCP on the VM where the external image file is located. You are advised to configure DHCP on the VM and then export the image file.
Prerequisites¶
You have logged in to the ECS used to create a Windows private image.
For details about how to log in to an ECS, see Elastic Cloud Server User Guide.
Ubuntu 18 or Later¶
Run vi /etc/netplan/01-netcfg.yaml on the ECS to open the /etc/netplan/01-netcfg.yaml file, and check whether the value of dhcp4 is true.
If dhcp4 is set to true, enter :q to exit the editor. No further action will be required.
network: version:2 renderer:NetworkManager ethernets: eth0: dhcp4: true
If dhcp4 is set to no and a static IP address is configured, go to the next step.
network: version:2 renderer:NetworkManager ethernets: eth0: dhcp4: no addresses: [192.168.1.109/24] gateway4: 192.168.1.1 nameservers: addresses: [8.8.8.8,114.114.114.114]
Press i to enter the editing mode.
Delete the static IP address settings and set dhcp4 to true. You can also use a number sign (#) to comment out the static IP address settings.
network: version:2 renderer:NetworkManager ethernets: eth0: dhcp4: true # Set dhcp4 to true. #dhcp4: no # Delete or comment out the static IP address settings. #addresses: [192.168.1.109] #gateway4: 192.168.1.1 #nameservers: # addresses: [8.8.8.8,114.114.114.114]
If your ECS has more than one NIC, configure DHCP for all of them.
network: version:2 renderer:NetworkManager ethernets: eth0: dhcp4: true eth1: dhcp4: true eth2: dhcp4: true eth3: dhcp4: true
Press Esc, enter :wq, and press Enter to save the settings and exit the vi editor.
Run the netplan apply command to make the settings take effect.
Ubuntu 16.04¶
Run the following command on the ECS to open the /etc/network/interfaces file:
vi /etc/network/interfaces
If DHCP has been configured for all NICs, enter :q to exit the vi editor.
auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto eth1 iface eth1 inet dhcp
If static IP addresses are set on the NICs, go to 2.
auto lo iface lo inet loopback auto eth0 #iface eth0 inet dhcp iface eth0 inet static address 192.168.1.109 netmask 255.255.255.0 gateway 192.168.1.1
Press i to enter the editing mode.
Delete the static IP address settings and configure DHCP for the NICs.
You can also use a number sign (#) to comment out the static IP address settings.
auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp
If the ECS has multiple NICs, you must configure DHCP for all the NICs.
auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto eth1 iface eth1 inet dhcp
Press Esc, enter :wq, and press Enter.
The system saves the settings and exits the vi editor.