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cloud engineer

Rocky Linux in a Container

Here’s how to run Rocky Linux in a Docker container.

Download the image.

docker pull rockylinux/rockylinux

Create a Rocky Linux container called bullwinkle.

docker run -it --name bullwinkle -d rockylinux/rockylinux

Login to the container using bash.

docker exec -it --user root bullwinkle /bin/bash

When done, stop and delete the container.

docker ps -a
docker stop container_ID
docker rm container_ID

Add path to zsh

Here’s how to add a path to zsh permanently.

Edit .zshrc file and add the path. Create .zshrc file if it’s missing.

export PATH=$PATH:/new/path

Exit and relaunch shell. The new path should be in effect.

Echo to display new path.

echo $PATH

Delete lines using awk

Here’s how to delete a line from a file using awk.

awk '!/Redhat/' sample.txt > sample.tmp && mv sample.tmp sample.txt

The command above looks for ‘Redhat’ in a file and removes that line from the file.

You can add the line in the crontab to run at reboot if you like.

crontab -e
@reboot awk '!/Redhat/' sample.txt > sample.tmp && mv sample.tmp sample.txt

Useradd With Specific uid and guid

Here’s the command to create a Linux user with a specific user id and group id.

sudo groupadd -r -g 1234567 username
sudo useradd -r -u 1234567 -g 1234567 -m -d /home/username -s /bin/bash nexus -c "my new account"

Database Clients on Linux

You can run database clients on your Linux distro by installing them.

MySQL

$ yum install mysql
$ apt install mysql

Postgress

$ yum install postgresql postgresql-client
$ apt install postgresql postgresql-client

MSSQL

$ yum install mysql-tools
$ apt install mssql-tools