Journal
I forgot I have my Kubernetes Administrator certification that I need to get done that expire in a few months I have decided to pause my cyber security certifications to complete this one first. Will brush me up on my Linux anyways
Learning Recap
Kodekloud is interesting. I feel like it tells you instead of teaches you. I think they would benefit from having the trainings use more analogies or ways to explain thing. Its like a firehouse that assumes you know how to ingest it.
this training has confirmed that i just need to go get intimate with the /etc directory
todo get intimate with the /etc directory on linux
I am not sure how much I digested tonight will be relavant for the CKA certification but I am trying to go along for the ride and trust in the process.
maybe I am just pouting because I want to work on cyber security certifications.
Raw Notes
- Linux commands
- du -sk test.img
- disk use in killabytes
- du -sh test.img
- human readable
- du -lh
- long list with size
- tar (tape archive)
- makes archives… I just always assumed this was just zipping
- tar -c
- create an archive
- tar -cf
- f adds the name of the file to be created
- tar -tf
- see contents of the tar ball
- tar -xf
- extract the contents of the tarball
- tar -z
- compress the size of the tarball
- Compressing
- bzip2
- bunzip2
- gzip
- gunxip
- xz
- unxz
- bzip2
- You can sometimes view zipped files
- zcat
- bzcat
- xzcat
- Searching in Linux
- find can replace locate command
- grep allows you to search within a file
- grep -i --- Makes the search case insensitive
- grep -r --- Searches for a pattern recursively in a directory showing the file it belongs to
- grep -v — lists all lines that don’t have a particular string
- grep -w will only print the line with the whole word you are searching for.
- grep -A --- print lines after a match number has to be after the A
- grep -B --- print lines before a match number has to be after the B
- IO Redirection
- STDIN
- STDOUT
- to redirect to a file use ”>” It will replace the contents
- To nor replace the contents but to append it use double arrows ”>>“
- STDERR
- ”2>” to redirect the errors - will whipe
- ”2>>” append
- ”/dev/null” send errors here if you dont want them printed on the screen
- Command line pipes (Linking of multiple pipes)
- ”|” use multiple commands
- ”| tee” - the stdout is printed on the screen before being placed in file
- ”| tee -a” appends it to the file instead
- Networking
- ”/etc/hosts”
- Forward All to 8.8.8.8 will point all names to the internet.
- ”cat /etc/resolv.conf”
- see the ip address of the DNS server in this system
- ”/etc/nsswitch.conf”
- name server config
- Switching
- I zoned out here.
- ”/etc/hosts”
- du -sk test.img
CKA Linux Linux Commands Networking
blog Going over the whole /etc folder