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doskanoness
n00b
Joined: 06 Oct 2021
Posts: 45
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 Posted: Sat Nov 06, 2021 5:26 pm Post subject: Unexpected change of the hostname |
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I have a problem with an unexpected change of the hostname. When I connect through LAN or by Wi-Fi to my home network, hostname is changed from gentoo to new-host-3. I use NetworkManager to connect to the network.
/etc/hosts:
| Code: | # /etc/hosts: Local Host Database
#
# This file describes a number of aliases-to-address mappings for the for
# local hosts that share this file.
#
# The format of lines in this file is:
#
# IP_ADDRESS canonical_hostname [aliases...]
#
#The fields can be separated by any number of spaces or tabs.
#
# In the presence of the domain name service or NIS, this file may not be
# consulted at all; see /etc/host.conf for the resolution order.
#
# IPv4 and IPv6 localhost aliases
127.0.0.1 gentoo.spacev7.org gentoo localhost
::1 gentoo.spacev7.org gentoo localhost
#
# Imaginary network.
#10.0.0.2 myname
#10.0.0.3 myfriend
#
# According to RFC 1918, you can use the following IP networks for private
# nets which will never be connected to the Internet:
#
# 10.0.0.0 - 10.255.255.255
# 172.16.0.0 - 172.31.255.255
# 192.168.0.0 - 192.168.255.255
#
# In case you want to be able to connect directly to the Internet (i.e. not
# behind a NAT, ADSL router, etc...), you need real official assigned
# numbers. Do not try to invent your own network numbers but instead get one
# from your network provider (if any) or from your regional registry (ARIN,
# APNIC, LACNIC, RIPE NCC, or AfriNIC.)
# |
/etc/conf.d/hostname:
| Code: | # Hostname fallback if /etc/hostname does not exist
hostname="localhost" |
/etc/hostname:
Router console:
https://i.imgur.com/opVjVij.png |
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Mistwolf
Apprentice
Joined: 07 Mar 2007
Posts: 189
Location: Edmonton, AB
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| Posted: Sat Nov 06, 2021 5:36 pm Post subject: |
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| make sure hostname-mode is set to none in networkmanager.conf |
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alamahant
Advocate
Joined: 23 Mar 2019
Posts: 3948
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| Posted: Sat Nov 06, 2021 5:40 pm Post subject: |
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Is this a systemd installation?
If yes plz use
| Code: |
hostnamectl set-hostname gentoo
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Last edited by alamahant on Sat Nov 06, 2021 5:50 pm; edited 2 times in total |
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doskanoness
n00b
Joined: 06 Oct 2021
Posts: 45
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| Posted: Sat Nov 06, 2021 5:49 pm Post subject: |
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| Quote: |
Is this a systemd installation? |
No, OpenRC. |
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alamahant
Advocate
Joined: 23 Mar 2019
Posts: 3948
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| Posted: Sat Nov 06, 2021 5:50 pm Post subject: |
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If it is a NM issue then use
| Code: |
nmcli general hostname gentoo
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doskanoness
n00b
Joined: 06 Oct 2021
Posts: 45
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| Posted: Sat Nov 06, 2021 6:03 pm Post subject: |
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| Mistwolf wrote: | | make sure hostname-mode is set to none in networkmanager.conf |
Thank you very much. Problem is solved. |
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Fitzcarraldo
Advocate
Joined: 30 Aug 2008
Posts: 2056
Location: United Kingdom
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| Posted: Sat Nov 06, 2021 11:36 pm Post subject: |
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Which DHCP client have you specified in the USE flags for NetworkManager? The preferred one by the NetworkManager developers is dhclient.
I specify the laptop’s hostname in /etc/hosts, /etc/conf.d/hostname, /etc/hostname and /etc/dhcp/dhclient.conf:
| Code: | # grep -v "^#\|^$" /etc/hosts
127.0.0.1 clevow230ss localhost
::1 clevow230ss localhost |
| Code: | # cat /etc/conf.d/hostname
# Set to the hostname of this machine
hostname="clevow230ss" |
| Code: | # cat /etc/hostname
clevow230ss |
| Code: | # grep -v "^#\|^$" /etc/dhcp/dhclient.conf
send host-name "clevow230ss";
supersede host-name "clevow230ss"; |
The purpose of the ‘supersede‘ statement in dhclient.conf is explained in man dhclient.conf(5):
| Quote: |
supersede [ option declaration ] ;
If for some option the client should always use a locally-configured value or values rather than whatever is supplied by the server, these values can be defined in the supersede statement. |
In other words, I do not want the hostname to be specified by a dhcp server (as this has caused problems for me in the past when connected to some networks).
I edited the configuration file /etc/NetworkManager/NetworkManager.conf to contain the following:
| Code: | [main]
plugins=keyfile
rc-manager=none
dhcp=dhclient
no-auto-default=*
[keyfile]
hostname=clevow230ss |
In earlier days it was necessary to specify the hostname in /etc/NetworkManager/NetworkManager.conf but that is no longer required. According to NetworkManager.conf(5) man page: "This key is deprecated and has no effect since the hostname is now stored in /etc/hostname or other system configuration files according to build options." I just left it in the file because it does no harm.
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