Re: Clearing DNS cache without rebooting

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On 12/09/2022 02:38 PM, Tim via users wrote:


What's in your /etc/resolv.conf and /etc/nsswitch.conf files?


[joe@khorlia ~]$ cat /etc/resolv.conf
# Generated by NetworkManager
search zeff.us
nameserver 8.8.8.8
nameserver 8.8.4.4
[joe@khorlia ~]$ cat /etc/nsswitch.conf
#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Valid entries include:
#
#	nisplus			Use NIS+ (NIS version 3)
#	nis			Use NIS (NIS version 2), also called YP
#	dns			Use DNS (Domain Name Service)
#	files			Use the local files
#	db			Use the local database (.db) files
#	compat			Use NIS on compat mode
#	hesiod			Use Hesiod for user lookups
#	[NOTFOUND=return]	Stop searching if not found so far
#

# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases
#
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

passwd:     files sss
shadow:     files sss
group:      files sss

#hosts:     db files nisplus nis dns
hosts:      files mdns4_minimal [NOTFOUND=return] dns myhostname

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files

bootparams: nisplus [NOTFOUND=return] files

ethers:     files
netmasks:   files
networks:   files
protocols:  files
rpc:        files
services:   files sss

netgroup:   files sss

publickey:  nisplus

automount:  files sss
aliases:    files nisplus
[joe@khorlia ~]$


Do you have the "dig" tool installed, what results does it return (and
in comparison to your other "working okay" machines)?


[joe@khorlia ~]$ dig slashdot.org

; <<>> DiG 9.10.5-P2-RedHat-9.10.5-2.P2.fc25 <<>> slashdot.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50703
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;slashdot.org.			IN	A

;; ANSWER SECTION:
slashdot.org.		300	IN	A	104.18.28.86
slashdot.org.		300	IN	A	104.18.29.86

;; Query time: 109 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Dec 09 14:45:42 MST 2022
;; MSG SIZE  rcvd: 73

The only "machine" I've tested on is my phone's browser, and it works fine. If you want, I can fire up my laptop and see what it does, but the fact that my phone can find slashdot strongly suggests that the issue is on this box only.
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