############################ Everything below are my raw notes that I took while attending an unofficial RHCSA training session. I am posting them here in hopes they will assist others who may be preparing to take this exam. My notes are my own interpretation of the lectures, and are certainly not a replacement to classroom training either through your company, or by taking the official RHCSA classes offered through Red Hat. If you are new to the Red Hat world, I strongly suggest looking into their training courses over at Red Hat. ############################
EXAM NOTE: Will need to know how to manually enable/create a repo
rpm -i : install rpm -q : query the database rpm -e : erase rpm.
EXAM NOTE: Probably won’t need to know much about rpm other then the above.
rpm -qa : Queries and lets you know everything that is installed. rpm -qi : Queries the rpm database for pkg info. rpm -qf : Determines which rpm a file is associated with. rpm -ql : Queries the rpm database to determine which files are associated with an rpm. rpm -Va : Verifies all installed packages. rpm -Vi: Verifies given package. rpm -Va |grep ^..5 : This will show you everything user has changed recently. Can be useful!
EXAM NOTE: Asides from the last one, nothing here is likely going to be applicable for the test.
How to extract RPM Contents:
cd /temp/dir rpm2cpio /path/to/package | cpio -i -d -m
EXAM NOTE: This will not be on test. If Apache is messed up, just reinstall it.
The wrapper for RPM is yum (Yellowdog updater modified).
install : Install stuff search : Find stuff : ex. yum search bash provides : Find files within packages when yum search doesn't help : ex. yum provides sed clean all : Useful if you broke your conf file and yum is broke. ex. yum clean all
EXAM NOTE: The above stuff will be used on test.
How to setup repository when Redhat says: “All your packages can be found at:
http://www.example.com/directory/of/packages.” To do this, first setup the repo:
vi /etc/yum.repos.d/myrepo.repo [myrepo] name = my repo thingy gpgcheck = 0 baseurl=http://www.example.com/directory/of/packages
Now list the available repos:
yum repolist
To import key if you like:
yum import /url/to/gpg/key
EXAM NOTE: **IMPORTANT** The above will be on test! This is CRITICAL. Without this, you cannot do anything!
To use a local repo, you set the baseurl as follows:
baseurl=file:///path/to/your/file