Ubuntu Commands

UbuntuCommands

Get OS version:
lsb_release -a

Get OS release name:
lsb_release -cs

Get Memory usage:
free -m

Resource monitor:
apt-get install htop
htop

Add sudo user:
  sudo useradd -s /bin/bash -m k8s-admin
  sudo passwd k8s-admin
  sudo usermod -aG sudo k8s-admin
  echo "k8s-admin ALL=(ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/k8s-admin

Switch user:
  su - k8s-admin

Docker:

Create a docker machine with specified CPU and Mem:
  sudo docker-machine create -d virtualbox \
  --virtualbox-boot2docker-url=https://releases.rancher.com/os/latest/rancheros.iso \
  --virtualbox-cpu-count 2 \
  --virtualbox-memory 4096 \
  --virtualbox-disk-size 40000 \
  single-cluster

Remove all containers/images:
# 'a' gett all, 'q' print Id only
docker rm $(docker ps -aq)
docker rmi $(docker images -aq)

Rancher:

Install Rancher Server with external database mount:
1. Create a folder: usr/mysql/cattle
2. sudo docker run -d -v /usr/mysql/cattle:/var/lib/mysql --restart=unless-stopped -p 8080:8080 rancher/server    

Single node install with audit log and persistance:
docker run -d --restart=unless-stopped -p 80:80 -p 443:443 \
-v /opt/rancher:/var/lib/rancher \
-v /var/log/rancher/auditlog:/var/log/auditlog \
-e AUDIT_LEVEL=1 \
rancher/rancher:latest

Customer cluster install:
1. Docker
2. VirtualBox
3. docker-machine
4. Create RancherOS machine for etcd: sudo docker-machine create -d virtualbox --virtualbox-boot2docker-url=https://releases.rancher.com/os/latest/rancheros.iso etcd-node