kubernetes, microservices, cloud and things like that

Motivation: helping devops to achieve daily basis results easier

Cheapest datacenters we have found

• hetzner
• scaleway
• vultr
• linode
• digitalocean
• upcloud
• ssdnodes * does not have block storage, load balancer or even hourly based prices
• lunanode
• netcup

Not so cheap, but interesting

• Exoscale
• Stackpath * It has a South America region

Make things easyer (tested in ubuntu)

Send your public ssh key to the datacenter control panel

Before running the commands remotely via ssh protocol you need to send your public ssh key to the datacenter of your choid (like one of those listed above / I.E. one you created your VPS)

To do that, copy the content showed after issueing the command below

cat ~/.ssh/id_rsa.pub

You should be able to see something like this:

ssh-rsa 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 e-mail-account@exampledomain.com

If you see the message below instead

/Users/[home]/.ssh/id_rsa.pub: No such file or directory

than create a brand new ssh key using the command below:

ssh-keygen -t rsa -P ""

If everything went right, you can copy the content showed using the command below

cat ~/.ssh/id_rsa.pub

And, finally, paste the ssh public key content just copied into the datacenter dashboard of your choice.

Update/upgrade/reboot remotely via SSH

Replace the letters bellow (X.Y.Z.W) with the correct VPSs IP addresses separeted by spaces. Example: (163.172.144.44 173.172.114.31 68.31.97.53)

declare -a IPS=(X.Y.Z.W)
for IP in ${IPS[@]}; do  ssh -o StrictHostKeyChecking=no -t root@$IP "echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections; apt update; apt -y -q upgrade; apt -y -q autoremove; apt -y -q install sudo curl zip unzip screen ; reboot;" ;  done

Install docker remotely via SSH

Replace the letters bellow (X.Y.Z.W) with the correct VPSs IP addresses separeted by spaces. Example: (163.172.144.44 173.172.114.31 68.31.97.53)

declare -a IPS=(X.Y.Z.W)
for IP in ${IPS[@]}; do  ssh -o StrictHostKeyChecking=no -t root@$IP "echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections; curl https://releases.rancher.com/install-docker/18.06.sh | sh; apt-mark hold docker-ce; " ;  done

Screen (tool for devops help)

Instalation

sudo apt install screen

Activating

sudo screen

Just press enter to continue...

Below are some most common commands for managing Linux Screen Windows:

Ctrl+a c Create a new window (with shell)
Ctrl+a " List all window
Ctrl+a 0 Switch to window 0 (by number )
Ctrl+a A Rename the current window
Ctrl+a S Split current region horizontally into two regions
Ctrl+a | Split current region vertically into two regions
Ctrl+a tab Switch the input focus to the next region
Ctrl+a Ctrl+a Toggle between the current and previous region
Ctrl+a Q Close all regions but the current one
Ctrl+a X Close the current region

Ctrl+a d You can detach from the screen session at any time by typing this
screen -r To resume your screen session