https://github.com/vpavlin/installfest2016
Demos for my InstallFest 2016 talk
https://github.com/vpavlin/installfest2016
containers demo docker fedora freebsd jails namespaces vagrant
Last synced: 2 months ago
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Demos for my InstallFest 2016 talk
- Host: GitHub
- URL: https://github.com/vpavlin/installfest2016
- Owner: vpavlin
- Created: 2016-03-05T09:43:38.000Z (about 9 years ago)
- Default Branch: master
- Last Pushed: 2017-02-21T10:07:00.000Z (about 8 years ago)
- Last Synced: 2025-01-23T03:45:24.655Z (4 months ago)
- Topics: containers, demo, docker, fedora, freebsd, jails, namespaces, vagrant
- Size: 2.93 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# installfest2016
*This is still work in progress*
Demos for my InstallFest 2016 talk
https://youtu.be/rTIjheXbwE8?list=PLub6xBWO8gV_Mr-UuxrHcfUbuGv5n_N5g
##Preparations
I am using Vagrant, you can too.
### Fedora
Go here https://getfedora.org/en/cloud/download/ and download a box of you choice - libvirt or virtualbox.
```
sudo vagrant box add fedora-cloud-23
sudo vagrant init fedora-cloud-23
sudo vagrant up
sudo vagrant ssh
```
### FreeBSD
If you are using virtualbox, you are good to go with
```
sudo vagrant init freebsd/FreeBSD-10.2-RELEASE
sudo vagrant up
sudo vagrant ssh
```
If you are using libvirt, you'll have to mutate the box
```
sudo vagrant plugin install vagrant-mutate
sudo vagrant box add freebsd/FreeBSD-10.2-RELEASE
sudo vagrant mutate freebsd/FreeBSD-10.2-RELEASE libvirt
sudo vagrant init freebsd/FreeBSD-10.2-RELEASE --provider libvirt
sudo vagrant up
sudo vagrant ssh
```
### Get rootfs
#### Fedora
```
curl -O https://kojipkgs.fedoraproject.org//packages/Fedora-Docker-Base/25/20170221.0/images/Fedora-Docker-Base-25-20170221.0.x86_64.tar.xz
tar xJf Fedora-Docker-Base-25-20170221.0.x86_64.tar.xz
mkdir rootfs
cd rootfs
tar xf ../5486f867eebad72e716d0c4ed1c278fbc6324f05315a0594738dc06e35e7f7ca/layer.tar
cd ~
```
#### FreeBSD
```
fetch ftp://ftp.freebsd.org/pub/FreeBSD/releases/amd64/10.1-RELEASE/base.txz
mkdir rootfs
cd rootfs
tar xJf base.txz
cd ~
```
##Demos
### chroot
In Fedora box
```
sudo chroot rootfs/
more /etc/os-release | grep PRETTY
```
### BSD Jails
```
uname -a
sudo vi /etc/jail.conf
sudo jail -c installfest
uname -a
#more /etc/sysctl.conf
```
### LXC
```
sudo dnf -y install lxc lxc-extra lxc-templates
sudo lxc-create -n test -P rootfs/ -t none
sudo lxc-start -n test -- bash
```
### systemd-nspawn
```
sudo systemd-nspawn -D rootfs/ bash
```
### Docker
Everybody knows this, right?;)
### runc
```
sudo dnf -y install runc
runc spec
more config.json
sudo runc start some-container
```
### Namespaces
#### Mount
```
mkdir /tmp/test
sudo unshare -m bash
mount --bind /tmp/test /media/
echo "Hello World" > /media/hello.txt
mount | grep media
more /media/hello.txt
```
In second terminal sshed to the VM try
```
mount | grep media
more /media/hello.txt
more /tmp/test/hello.txt
```
#### UTS
```
sudo unshare -u bash
hostname
sysctl -q -w kernel.hostname="installfest"
```
In second terminal sshed to the VM try
```
hostname
```
#### IPC
```
sudo unshare -i bash
ipcs
ipcmk -M 20
ipcs
```
In second terminal sshed to the VM try
```
ipcs
```
#### PID
```
sudo unshare -p --fork bash -c 'sleep 100000 &
bash'
ps
```
Whaaat? How come it's not 1 and 2, but some crazy number? Because ps uses `/proc`
```
sudo unshare -p --fork --mount-proc bash -c 'sleep 100000 &
bash'
ps aux
```
Better, in second terminal sshed to the VM try
```
ps aux | grep sleep 1000
```
#### Network
```
sudo unshare -n bash
ip a
```
#### User
```
unshare -U -r
echo "Ahoj" > aaa
ls -la aaa
```
In second terminal sshed to the VM try
```
ls -la aaa
```
#### Pivot Root
```
sudo unshare -m -p -i -n -u --fork --mount-proc bash
root=/home/vagrant/rootfs
mkdir $root/.pivot
mount --bind $root $root
pivot_root $root $root/.pivot
cd /
exec bash
rpm -q bash
```
### Cgroups
```
sudo sytemd-cgls
sudo systemd-nspawn --slice=test.slice -D rootfs/ bash
sudo systemd-cgls | grep -A 1 -B 1 machine-rootfs\.scope
```