LFS201 Ch 06: Clarification on rebuilding RPM database + More and more questions :)

here it says
You can use the --rebuilddb option to rebuild the database indices from the installed package headers
What exactly is meant by 'installed package headers' ?
Are these files in specific install directories? And where are they exactly?
Also, i'm reading from fedora docs that we should back up the rpm database before running rpm --rebuilddb
. Is that done with rpm, or just cp
command?
What situations in real life can result in corrupted rpm database, and why would rebuilding the database have risks? If the database is based on the header entirely, wouldn't backing up the database be superfluous? I mean, you would back up the source of information, not result of information
It take it the database isn't intrinsically necessary (they could have programmed rpm & dnf etc...to not use/need one) but rather is used for performance reasons, correct?
Comments
-
Another question: I am on the lab assignment now, investigating what package
/etc/logrotate.conf
belongs toFor some reason I dont have
/etc/logrotate.conf
on my system, but I do have/etc/logrotate.d/
folder which contains three files:dnf
,tinyproxy
, andwpa_supplicant
Now, I've found that
/etc/logrotate.d/
folder belongs towpa_supplicant-x.y.z
while thednf
file belongs to packagednf-data-x.y.z
What does it mean that a folder belongs to one package and files inside belong to another package?
Well, I figured that if a file from package
dnf-data
is inside a folder from packagewpa_supplicant
thendnf-data
must requirewpa_supplicant
However, when I list which packages are required by
wpa_supplicant
I dont seednf-data
in there, and same visa versaAny ideas?
0 -
It's an experiment I won't do, but if you nuke both /var/lib/rpm and /var/cache/yum (or dnf) you are likely to have a system very hard to rebuild. Or you can temporarily rename them and try to run rpm -q commands for example. I've been in this situation and it is hard to recover from as you either have to install from source or copy (to begin with) from a working system and try to rebuild properly.
You can just back up with cp as in "cp -ax /var/lib/rpm /tmp/varlibrpm" or use a tar command
I've seen the data base corrupted when a system goes weird during an update or something, or an accident rm command etc. It's not that hard to do.
/var/cache/yum (or dnf) is for performance reasons. If you do something like "dnf clean all", you wipe out
almost everything in /var/cache/dnf, but nothing doesn't work. if you wipe out /var/lib/rpm good luck0 -
I don't know why you do not have logrotate.conf. On any Fedora system I have it is there as long as you have the logrotate package installed, and it is a base package AFAIK (rpm -q logrotate) As far as the stuff in logrotate.d, those files are installed by any package that needs to use the logrotate program and they definitely do not belong to logrotate. That's the whole idea; as packages are installed they sprinkle config files in "/etc/.d" directories such as this or modprobe.d (do du /etc/.d)
0 -
Hi @syntapy ,
What distro and version are you using?
I'm on Ubuntu 18.04 and I have it by default:
[email protected]:/etc$ ls -l logrotate.conf
-rw-r--r-- 1 root root 703 Yag 21 2017 logrotate.conf[email protected]:/etc$ ls -l logrotate.conf
-rw-r--r-- 1 root root 703 Yag 21 2017 logrotate.conf[email protected]:/etc$ dpkg -S /etc/logrotate.conf
logrotate: /etc/logrotate.conf[email protected]:/etc$ dpkg -l logrotate
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-================-=============-=============-======================================
ii logrotate 3.11.0-0.1ubu amd64 Log rotation utilityRegards,
Luis.0 -
if he really doesn't have logrotate.conf the system is a mess, I would not bother trying to debug. It's an anomaly and weird or got deleted. No need to discuss further. It's a base package file on any distro AFAIK.
However, he is on Open Suse Tumbleweed which is definitely not supported, so I don't know.0
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