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Ubuntu ships with a number of graphical utilities to configure your network devices.
This document is geared toward server administrators and will focus on managing your network on the command line. Ethernet interfaces are identified by the system using predictable network interface names. These names can appear as eno1 or enp0s However, in some cases an interface may still use the kernel eth style of naming.
To quickly identify all available Ethernet interfaces, you can use the ip command as shown below. Another application that can help identify all network interfaces available to your system is the lshw command. This command provides greater details around the hardware capabilities of specific adapters.
In the example below, lshw shows a single Ethernet interface with the logical name of eth0 along with bus information, driver details and all supported capabilities. Interface logical names can also be configured via a netplan configuration.
If you would like control which interface receives a particular logical name use the match and set-name keys. The match key is used to find an adapter based on some criteria like MAC address, driver, etc. Then the set-name key can be used to change the device to the desired logial name.
The following is an example of how to view supported features and configured settings of an Ethernet interface. The following section describes the process of configuring your systems IP address and default gateway needed for communicating on a local area network and the Internet.
The ip command allows you to configure settings which take effect immediately, however they are not persistent and will be lost after a reboot. To temporarily configure an IP address, you can use the ip command in the following manner.
Modify the IP address and subnet mask to match your network requirements. The ip can then be used to set the link up or down.
To verify the IP address configuration of enp0s25 , you can use the ip command in the following manner. To configure a default gateway, you can use the ip command in the following manner. Modify the default gateway address to match your network requirements.
To verify your default gateway configuration, you can use the ip command in the following manner. A more lengthy description of the proper persistent way to do DNS client configuration is in a following section. If you no longer need this configuration and wish to purge all IP configuration from an interface, you can use the ip command with the flush option as shown below.
The example below assumes you are configuring your first Ethernet interface identified as enp3s0. The configuration can then be applied using the netplan command.
The example below assumes you are configuring your first Ethernet interface identified as eth0. Change the addresses , gateway4 , and nameservers values to meet the requirements of your network. The loopback interface is identified by the system as lo and has a default IP address of It can be viewed using the ip command.
Name resolution as it relates to IP networking is the process of mapping IP addresses to hostnames, making it easier to identify resources on a network.
The following section will explain how to properly configure your system for name resolution using DNS and static hostname records. Systemd-resolved handles name server configuration, and it should be interacted with through the systemd-resolve command. You can also add an optional DNS suffix search-lists to match your network domain names. The resulting file might look like the following:.
The search option can also be used with multiple domain names so that DNS queries will be appended in the order in which they are entered. For example, your network may have multiple sub-domains to search; a parent domain of example. If you have multiple domains you wish to search, your configuration might look like the following:.
Entries in the hosts file will have precedence over DNS by default.
In some configurations, especially when Internet access is not required, servers that communicate with a limited number of resources can be conveniently set to use static hostnames instead of DNS. Server1 has been mapped to the name vpn , server2 is referred to as mail , server3 as www , and server4 as file.
To modify the order of the above mentioned name resolution methods, you can simply change the hosts: string to the value of your choosing. Bridging multiple interfaces is a more advanced configuration, but is very useful in multiple scenarios. One scenario is setting up a bridge with multiple network interfaces, then using a firewall to filter traffic between two network segments. Another scenario is using bridge on a system with one interface to allow virtual machines direct access to the outside network.
The following example covers the latter scenario. The new bridge interface should now be up and running. The brctl provides useful information about the state of the bridge, controls which interfaces are part of the bridge, etc.
See man brctl for more information. The Ubuntu Wiki Network page has links to articles covering more advanced network configuration. The netplan website has additional examples and documentation. The netplan man page has more information on netplan. The systemd-resolve man page has details on systemd-resolve command. The systemd-resolved man page has more information on systemd-resolved service.
For more information on bridging see the netplan.
The material in this document is available under a free license, see Legal for details. For information on contributing see the Ubuntu Documentation Team wiki page.
To report errors in this serverguide documentation, file a bug report. Partners Support Community Ubuntu. Ubuntu Previous Next. Ethernet Interfaces. Identify Ethernet Interfaces. Ethernet Interface Logical Names. Ethernet Interface Settings. IP Addressing.
Temporary IP Address Assignment. Static IP Address Assignment. Loopback Interface. Name Resolution. DNS Client Configuration. Static Hostnames. Name Service Switch Configuration. Enter the appropriate values for your physical interface and network.