AWS : SSH Issue - Permission denied

https://stackoverflow.com/questions/36300446/ssh-permission-denied-publickey-gssapi-with-mic

 (publickey,gssapi-keyex,gssapi-with-mic).

ssh -i "CCA_Product.pem" ec2-user@10.79.197.206

docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html#how-to-generate-your-own-key-and-import-it-to-aws

ssh-keygen -m PEM

pem

pub

awsfeed.com/uncategorized/using-ec2-serial-console-to-access-the-grub-menu-and-recover-from-boot-failures

docs.aws.amazon.com/AWSEC2/latest/UserGuide/connect-to-serial-console.html#sc-connection-methods

Push your SSH public key to the instance to start a serial console session

aws ec2-instance-connect send-serial-console-ssh-public-key \

    --instance-id i-06a0d8564550494b0 \

    --serial-port 0 \

    --ssh-public-key file://serialAccess.pub \

    --region us-east-1

Connect to the serial console using your private key

ssh -i serialAccess i-06a0d8564550494b0.port0@serial-console.ec2-instance-connect.us-east-1.aws

i-06a0d8564550494b0

Linux : KDE Neon

https://linuxhint.com/install-kde-neon-oracle-virtualbox/

KDE Neon --- Derivative of Ubuntu Linux

Konsole ---- Transparent 

LINUX:TMUX

https://youtu.be/l-lcd1MrSLM

tecmint.com/tmux-to-access-multiple-linux-terminals-inside-a-single-console/

https://askubuntu.com/questions/850055/ctrl-b-c-n-w-etc-not-working-in-tmux-console

https://ostechnix.com/tmux-command-examples-to-manage-multiple-terminal-sessions

https://www.networkworld.com/article/3545370/how-to-use-tmux-to-create-a-multi-pane-linux-terminal-window.htm

tmux

ctrl+b     and  Shift+%    :::  Split Vertically

ctrl+b     and  Shift+"     :::  Split Horizontally

Type "exit" from a particular window To kill that window/screen 

ctrl+b     and  d     :::  End Session

for example, to create a new terminal hold ctrl+b and release it then press shift+5 (%)

Maven : Snippet to copy all dependencies in 1 Folder

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>3.1.2</version> <executions> <execution> <id>copy-dependancies-to-libs</id> <phase>package</phase> <goals> <goal>copy-dependencies</goal> </goals> <configuration> <outputDirectory>${project.parent.basedir}/dependent-libs</outputDirectory> <overWriteReleases>false</overWriteReleases> <overWriteSnapshots>false</overWriteSnapshots> <overWriteIfNewer>true</overWriteIfNewer> </configuration> </execution> </executions> </plugin>

Linux : Search for files

https://www.geeksforgeeks.org/find-command-in-linux-with-examples/

 find ./GFG -name sample.txt 

Kubectl : Copy from Host to Kubectl POD - Logs Kubernetes Tail

https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB0383441

docker cp <src-path> <container>:<dest-path> 

kubectl cp <src-path> <your-pod-name>:<dest-path> 

kubectl cp  /data/ids_runtime_docker/DB_Script/IDS_Extraction_Application_Form_CS.tar    mongodb-0:/tmp

https://zoomadmin.com/HowToInstall/UbuntuPackage/less

sudo apt-get install -y less

https://kubernetes.io/docs/reference/kubectl/cheatsheet/

kubectl logs my-pod  -f

Ubuntu : Debian : update vs upgrade vs list –upgradable

https://linuxsecurity.com/features/how-to-install-security-updates-in-ubuntu-debian

The commands we shall cover pertaining to this topic are: 

• apt update: This command only fetches the information on latest packages that can be upgraded. Note that it does not actually upgrade any packages on the system, only refreshes the index local to the system. This package information is obtained from standard official sources and then stored locally on the system. If ever you need to check from which sources the package information gets picked, you will see it in under /etc/apt/sources.list on the system.
• apt list –upgradable: This command will then display the packages that have updates available and therefore can be upgraded on the system. This information is based on the information fetched previously from the update command
• apt upgrade: This is the actual command that does the upgrade of the packages in the system. Once executed, the OS will be successfully upgraded. Note that this command can install new packages if the dependencies require it, but it will never remove packages.
• apt full-upgrade: This command does a little more than what the upgrade command does. In addition to upgrading new packages and installing new packages as required, it also removes existing installed packages if it determines that the dependencies are no longer required. Use this option with caution as it can cause unexpected system behavior if your application is dependent on a specific version of the package.
• apt autoremove: This command is used to remove unused packages which are no longer needed by the dependent packages. This can be executed after apt upgrade