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:
luis@ubuntu18server:/etc$ ls -l logrotate.conf
-rw-r--r-- 1 root root 703 Yag 21 2017 logrotate.confluis@ubuntu18server:/etc$ ls -l logrotate.conf
-rw-r--r-- 1 root root 703 Yag 21 2017 logrotate.confluis@ubuntu18server:/etc$ dpkg -S /etc/logrotate.conf
logrotate: /etc/logrotate.confluis@ubuntu18server:/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
Categories
- All Categories
- 51 LFX Mentorship
- 104 LFX Mentorship: Linux Kernel
- 576 Linux Foundation IT Professional Programs
- 304 Cloud Engineer IT Professional Program
- 125 Advanced Cloud Engineer IT Professional Program
- 53 DevOps Engineer IT Professional Program
- 61 Cloud Native Developer IT Professional Program
- 5 Express Training Courses
- 5 Express Courses - Discussion Forum
- 2.1K Training Courses
- 19 LFC110 Class Forum
- 7 LFC131 Class Forum
- 27 LFD102 Class Forum
- 158 LFD103 Class Forum
- 20 LFD121 Class Forum
- 1 LFD137 Class Forum
- 61 LFD201 Class Forum
- 1 LFD210 Class Forum
- LFD210-CN Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum
- LFD237 Class Forum
- 23 LFD254 Class Forum
- 611 LFD259 Class Forum
- 105 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 1 LFD273 Class Forum
- 2 LFS145 Class Forum
- 25 LFS200 Class Forum
- 739 LFS201 Class Forum
- 1 LFS201-JP クラス フォーラム
- 11 LFS203 Class Forum
- 75 LFS207 Class Forum
- 300 LFS211 Class Forum
- 54 LFS216 Class Forum
- 47 LFS241 Class Forum
- 41 LFS242 Class Forum
- 37 LFS243 Class Forum
- 11 LFS244 Class Forum
- 37 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 141 LFS253 Class Forum
- LFS254 Class Forum
- 1.1K LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 93 LFS260 Class Forum
- 132 LFS261 Class Forum
- 33 LFS262 Class Forum
- 80 LFS263 Class Forum
- 15 LFS264 Class Forum
- 11 LFS266 Class Forum
- 18 LFS267 Class Forum
- 18 LFS268 Class Forum
- 23 LFS269 Class Forum
- 203 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- LFS281 Class Forum
- 236 LFW211 Class Forum
- 172 LFW212 Class Forum
- 7 SKF100 Class Forum
- SKF200 Class Forum
- 903 Hardware
- 219 Drivers
- 74 I/O Devices
- 44 Monitors
- 116 Multimedia
- 209 Networking
- 101 Printers & Scanners
- 85 Storage
- 763 Linux Distributions
- 88 Debian
- 66 Fedora
- 15 Linux Mint
- 13 Mageia
- 24 openSUSE
- 142 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 357 Ubuntu
- 479 Linux System Administration
- 41 Cloud Computing
- 70 Command Line/Scripting
- Github systems admin projects
- 95 Linux Security
- 78 Network Management
- 108 System Management
- 49 Web Management
- 68 Mobile Computing
- 23 Android
- 30 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 538 Off Topic
- 131 Introductions
- 217 Small Talk
- 22 Study Material
- 826 Programming and Development
- 278 Kernel Development
- 514 Software Development
- 928 Software
- 260 Applications
- 184 Command Line
- 3 Compiling/Installing
- 76 Games
- 316 Installation
- 61 All In Program
- 61 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)