Những câu hỏi thường gặp về Linux
And make sure that either the
/etc/host.conf
or
/etc/resolv.conf
file contains the line:
order hosts,bind
Thận trọng
Do not change the “localhost” entry in /etc/hosts, because many programs
depend on it for internal message-passing.
Sendmail takes many factors into account when resolving domain addresses. These factors, collectively,
are known as, “rulesets,” in sendmail jargon. The program does not require that a domain address be
canonical, or even appear to be canonical. In the example above, “
bilbo.
” (note the period) would
work just as well as “
bilbo.bag-end.com
.” This và other modifications apply mainly to recent
versions.
Prior to version 8.7, sendmail required that the FQDN appear first in the [/etc/hosts] entry. This is due to
changes in the envelope address masquerade options. Consult the sendmail documents.
If you have a domain name server for only a local subnet, make sure that “.” refers to a SOA record on
the server machine, và that reverse lookups (check bởi using nslookup) work for all machines on the
subnet.
Finally,
FEATURE
configuration macro options like
nodns
,
always_add_domain
, và
nocanonify
,
control how sendmail interprets host names.
The document, Sendmail: Installation và Operation Guide, included in the
doc/
subdirectory of
Sendmail source code những bản phân phối, discusses briefly how Sendmail resolves Internet addresses.
Sendmail source code archives are listed at: http://www.sendmail.org/
Chris Karakas
H:
Làm thế nào để cho phép và chọn console ảo
Đ:
In text mode, press the left Alt-F1 to Alt-F12 to select the consoles
tty1
to
tty12
; Right Alt-F1
gives
tty13
và so on. To switch out of X you must press Ctrl-Alt-F1, etc; Alt-F5 or whatever will
switch back.
However, If you have a non-PC compatible system, please see the note below.
If you want to use a VC for ordinary login, it must be listed in /etc/inittab, which controls which
terminals và virtual consoles have login prompts. The X Window System needs tại least one free VC in
order to start.
Ghi chú: The key sequence is actually Ctrl Meta FN. On PC compatible systems, the right và left Alt
keys are really synonymous with the keysymbols Meta_L và Meta_R. If the binding is different, you can
determine what keys produce Meta_L và Meta_R with xkeycaps or a similar application.
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