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OpenStack Summit 2018 - Vancouver
Containerize your life!How to live with always not enough resources
Joachim von ThaddenEMEA Senior Specialist Solution Architect OpenStack
Thu 24.5.2018, 1:50pm - 3:20pm
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Demo
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The Promise First Steps with LXD
How to Virtualize without Virtualization? And now the heavy stuff!
The culprits of misusing a Container First Steps with libvirt
Let’s get our fngers dirty... OpenStack: Install Packstack
AGENDA
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Disclaimer
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Warning… this is not a traditional lab!
This Lab differs from others! It is not meant to be a guided tour through a technology!See it more as an experimental session to fgure out the borders of technology…
So expect failures, questions and “agile customization”!
And: You must not copy+paste blindly as you will have to adapt commands to your environment!
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Instead of an USB Stick...Content URL
The slides can be found under the following URL:https://github.com/jthadden/OpenStack_Summit_2018_Vancouver/doc
maybe also via my Laptop:http://10.193.251.235/pubhttp://10.193.251.235/reposhttp://10.193.251.235/isos
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The Promise
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You can (mis-)use a Container as a full blown Virtual Machine!
Even better: You can virtualize without nesting!
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The Culprit of VirtualizationThe reason why we don’t like it if we are not an enterprise!
● Resources● Resourcessss● Resourcessssssss
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OpenStack… is a Whale!
A full blown OpenStack consists of at least● 1 Installer (Director or other) (16GB RAM, 4CPUs, 100GB Disk)● 3 Controllers (>12GB RAM, >4 CPUs, 100GB Disk)● >2 Computes (>4GB RAM, >4 CPUs, 100GB Disk)● Some Storage (e.g. for live migration) (>4GB RAM, 2 CPUs, >100GB Disk)
At least 60GB RAM, 30 CPUs, 700GB Disk.
I can do it with 24GB RAM, 2 CPUs + HT, 100GB Disk :-)
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How to Virtualize without Virtualization?
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How to Virtualize without Virtualization?Some type of Container is your friend!
● chroot● Container● Other Ideas?
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Useful Container Technologies...... and why we can't or don't want to use them (and I tried them all!)
I tried them all:● Chroot
○ lacking of namespace separation and no own networking stack(because of the former)
● Docker○ working but problems with (needed) privileged actions
● Legacy OpenVZ (vzctl)○ does the job, but you might need to use the upstream package○ not supported very well
● Lxc○ does the job, but horrible to confgure and use
● Systemd-nspawn○ nested virtualization is a problem
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The best way today - and why we have to cry
LXD - the LXC Daemon● It’s actually a daemon for LXC.● Coming from Canonical - so will probably die when Shuttleworth dies
○ BUT it's OpenSource! So who cares!● LXD is based on LXC and that's running out of support of Red Hat
(and might be removed in the future)○ Never mind, we will use Fedora…
If you don't like the LXD appraoch● you can do it as well with Legacy OpenVZ (install vzctl-core)
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The culprits of misusing a Container
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Containers have several restrictions
● no nested selinux● restricted systemd● no auditd● no sysctl● no module loading● problems with subscribing● error with iscsi
○ open bug since YEARS now with missing namespacing in scsi-modules
● Probably more you will face!
And many of them can not even been circumvented by running the container privileged!
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BUT:so many things are working like a charm● Booting :-)● 99% networking● frewalling● namespaces● virtualization● 99.9% feeling of real machine
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Let’s get our fngers dirty...
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Need a VM?There is a VM-Image of an already installed and confgured Fedora-26 VM (qcow2):
http://<IP>/isos/Fedora-26-RHTE.qcow2
● make one with at least 8GB, 2CPU, 80GB HDD based on Fedora 26, copy CPU confg● start the VM and install Fedora 26
➔ on other distros see: https://linuxcontainers.org/lxd/getting-started-cli/● install needed Software
dnf -y upgradednf -y groupinstall cloud-managementdnf -y install libguestfs-tools
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Enabling LXDdnf -y copr enable ganto/lxd# don't use ganto/lxc3 for Fedora28 at the moment, instead edit# /etc/yum.repos.d/_copr_ganto-lxd.repo and change $releasever to 27dnf -y install lxd lxd-client lxd-tools
getent group lxd > /dev/null || groupadd -f -r lxdecho "root:1000000:65536" >> /etc/subuidecho "root:1000000:65536" >> /etc/subgidsetenforce 0systemctl start lxd.serviceusermod --append --groups lxd rhte
To make it permanent (e.g. in a special VM):sed -i -e "s/SELINUX=enforcing/SELINUX=permissive/" /etc/selinux/configsystemctl enable lxd.service
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LXD can be used as a Server daemonE.g. if you have some stronger machine in the cellar.
Add the following:lxc config set core.https_address "[::]"lxc config set core.trust_password <your PW>firewall-cmd --add-port=8443/tcp --permanentfirewall-cmd --reload
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Add some storage
There are numerous storage options like● ZFS● Btrfs● LVM● Plain Filesystem <- we will use that
Re-login as normal user rhte and execute:lxc storage create default dirlxc profile device add default root disk path=/ pool=default
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First Steps with LXD
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Start your frst lightweight VMAll lxc commands should be issued as user rhte!
lxc image list images:|grep -i centos # remote repository imageslxc image list # local available imageslxc launch images:centos/7 my-centos7-containerlxc exec my-centos7-container /bin/bashlxc list [regexp] # to list containers with state
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Some more Commands
lxc info my-centos7-container # getting Infolxc {network|profile|config|storage} listlxc {network|profile|config|storage} showlxc config show compute0 --expanded # getting all configs
# (like image, storage, security"ps aux | grep "containers compute0" # find the monitoring process of a
# container (e.g. if hanging)lxc list security.privileged=true # list all privileged containerslxc start|stop|restart|pauselxc file pull|push|edit <container>/<path> [-] # - means stdout
lxc config device add mycontainer vartest disk source=/var/www path=/var/test# attach a dir to a container
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Prepare a CentOS image for our special usage with LXD
● learn here the easy way○ to do the things which are not working in an LXD-Container
● we need○ a profle○ the CentOS image in lxc (you know how to get it)○ a rc.local fle:
https://raw.githubusercontent.com/jthadden/OpenStack_Summit_2018_Vancouver/master/roles/layer2_bootstrap_container/fles/rc.local-container
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Create a new ProfleRemember: user is always rhte!
lxc profile create rhosplxc network attach-profile virbr0 rhosp eth0lxc profile device add rhosp root disk path=/ pool=defaultlxc profile set rhosp security.privileged true
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rc.local
→ let us go through it, to understand what to do ←on the git repo go to:
roles/layer2_bootstrap_container/files/rc.local-container
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Prepare your CentOS with the rc.locallxc image listlxc launch -p rhosp images:centos/7 my-centos7-containerlxc exec my-centos7-container /bin/bash# install and start sshdyum -y install openssh-server filesystemctl enable sshd && systemctl start sshdpasswd root# and try to sshd into itlxc listssh root@<IP># get rc.local and executecurl <...> -o /etc/rc.localchmod 755 /etc/rc.localsystemctl enable rc-localreboot# look into logfile for execution of rc.local
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Let’s try some real work!
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Install an IPA
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Prepare the ContainerSet hostname, enable repos and install frewalld
# ssh into the containerhostnamectl set-hostname `hostname`.rhte.internal
yum repolistyum install firewalldsystemctl enable firewalld && systemctl start firewalld
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Install and Confgure IPA
yum -y install ipa-server ipa-server-dnsipa-server-install --setup-dns --forwarder=8.8.8.8 -r \`dnsdomainname|tr a-z A-Z` -p "changeme" -a "changeme" -U 2>&1 | \tee ipa-install.out--setup-dns
# open the firewall accordinglyfirewall-cmd --permanent \--add-port={80/tcp,443/tcp,389/tcp,636/tcp,88/tcp,464/tcp,53/tcp,88/udp,464/udp,53/udp,123/udp}firewall-cmd --reload
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Test IPA
kinit adminklistipa user-find admin
1. if you want to see the webinterface, use on your host something likesshuttle -r root@<yourVMsIP> <yourContainersIP>
2. add the host to your /etc/hostsecho "<IPofContainer> my-centos7-container.rhte.internal" >> /etc/hosts
3. Browse to your IPAhttps://my-centos7-container.rhte.internal
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Now try out VMs in Containers!
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Install libvirt
yum -y install libvirt libvirt-daemon-kvmsystemctl enable libvirtdsystemctl start libvirtd
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Try out libvirt in a containerNote: You should always ssh -AX to your host…
Attention: The following is done on the VM/your host, not in the container!Map an image into the Container:curl http://download.cirros-cloud.net/0.3.5/cirros-0.3.5-x86_64-disk.img \-o cirros-0.3.5-x86_64-disk.img
lxc config device add my-centos7-container image disk \source=`pwd`/cirros-0.3.5-x86_64-disk.img \path=/var/lib/libvirt/images/cirros-0.3.5-x86_64-disk.img
Start virt-manager:● Either install in the VM or use the sshuttle connection from the IPA test on your host.● Add a new connection to your Container via ssh.● Add a new VM, select the Image and start it.● Look at your Host and Container for the VM: pgrep -af kvm|grep kvm .
You might want to stop this container now!
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And now the heavy stuff!
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If OpenStack is working on that, then everything will do!
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The git repo has the code for an ansible install of RDO in it:
https://github.com/jthadden/OpenStack_Summit_2018_Vancouver.git
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git it and start itNote: You should always ssh -AX to your host…We are now working of the VM/Host again...
yum -y install git ansible libselinux-python python-firewallgit clone https://github.com/jthadden/OpenStack_Summit_2018_Vancouver.gitcd OpenStack_Summit_2018_Vancouver/# add a host entry for localhost (see config_infrastructure.yml)echo "<yourVMorHostIP> myserver" >> /etc/hosts# when working with a VM: generate an ssh key or copy it over from your host: ssh-keygen && ssh-add./create.sh
# be patient...
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playbook usage
● to stop the containers use:ansible-playbook -v -i hosts-OSSummit-minimal -e @config/config_OSSummit_minimal.yml -e @config/config_infrastructure.yml stop.yml
● to start again the containers use:ansible-playbook -v -i hosts-OSSummit-minimal -e @config/config_OSSummit_minimal.yml -e @config/config_infrastructure.yml start.yml
● to destroy the cloud use:ansible-playbook -v -i hosts-OSSummit-minimal -e @config/config_OSSummit_minimal.yml -e @config/config_infrastructure.yml destroy.yml
● to install an extended version with 3 computes and a network node use:ansible-playbook -v -i hosts-OSSummit -e @config/config_OSSummit.yml -e @config/config_infrastructure.yml create.yml
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Please provide feedback.Please clone.
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Thank you!