DevOps engineer's starting pack

Let's pretend you have a new computer after you joined to a new company and you have to setup everything from scratch.

Usually I use macOS but it suits to a Linux machine even.

This is how my starting pack looks like:

• Chrome browser (on my private machine I use Vivaldi but this is because many companies has Google Workspace),
• Homebrew (a package manager),
• KeePassXC (a password manager),
• iTerm2 (a terminal emulator with a terminal split),
• Oh My Zsh (manage your Zsh shell),
• Visual Studio Code:
• Terraform extension,
• YAML extension,
• Hashicorp HCL extension,
• a GitHub account (I don't use my personal account but I create an account per company because sometime they want you to setup something additional what you maybe don't want),
• AWS CLI,
• aws-vault (store and access your AWS credentials),
• kubectl,
• kubectx (switch between your Kubernetes clusters),
• Helm,
• Python pip,
• tfenv to switch between Terraform versions (you don't have to separately install Terraform),
• Docker,
• Vim:
• add in ".vimrc" file in your home directory (start from the last position):
  au BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$") | exe "normal! g`\"" | endif

LXC - let's get started

I know that everyone uses Docker but sometimes you have to take care of some legacy server where you have, for example, LXC container in which your client runs a Docker container (I know it's weird).

Le'ts imagine you have in you LXC container a device which is mounted as "/var/lib/docker" path. You don't have enough space on it and you don't want to restart the server or even LXC daemon. Let's just replace it.

Add a new device:
lxc storage create new-device btrfs size=100GB

Add a new volume to the device:
lxc storage volume create new-device volume

Then we have get into the LXC container and stop the Docker daemon:
lxc exec lxc-container -- /bin/bash
systemctl stop docker
exit

Disable the previous device from the LXC container:
lxc config device remove lxc-container old-device

Add the new device:
lxc config device add lxc-container some-name disk pool=new-device path=/var/lib/docker source=volume

Run the Docker daemon in the container.

Some additional useful commands:

• storage list: "lxc storage list",
• what connected device your container has: "lxc config show container-name --expanded",
• run a LXC container with a given profile and image: "lxc launch ubuntu:20.04 container-name -p default",
• run containers: "lxc list",
  
• stop and remove a container: "lxc stop container-name", "lxc delete container-name",
• information about a storage: "lxc storage show storage-name",
• list the volumes in a storage: "lxc storage volume list storage-name",
• remove a volume from a storage: "lxc storage volume delete storage-name volume-name",
• remove a storage: "lxc storage delete storage-name".