Talk held by Jaime Melis at the CentOS Dojo in Cologne, August 4th (http://wiki.centos.org/Events/Dojo/Cologne2014) In this talk we talk about OpenNebula from the perspsective of the CentOS, explaining tips and considerations for power users.

1. Cologne, Germany– August 4th 2014
OpenNebula
CentOS Dojo
Key Aspects of OpenNebula in CentOS
Jaime Melis
Project Engineer
© OpenNebula Project. Creative Commons Attribution-NonCommercial-ShareAlike License

2. Upcoming Release Features
OpenNebula 4.8
● OpenNebula 4.8 will be release this week!
● New Virtual Network Model
● New Address Range Concept
● Identify federated zone in the logs (syslog)
● Raw Device mapping datastore
● Clone Image to another datastore
● More Hybrid Clouds: Azure, SoftLayer (and EC2)
● OneFlow and OneGate got shinier!
● User Inputs
● New VDCAdmin View
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3. CentOS 7
Awesome!!
● Newer Ruby! Newer Apache! Newer Kernel! Newer…
Everything (it looks so shiny!)
● Small footprint!
● Already everywhere!
● We really like modern and stable software
● Amazing community for users and devs
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4. Firewalld
CentOS 7
But …
NetworkManager
Systemd
● New Challenges
● Learn or Die!
● Long nights coding…
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5. OpenNebula in CentOS 7
Ruby
● Ruby 1.9… better performance!!
(we had this a lot in the code if RUBY_VERSION < 1.9 )
● Missing gems from EPEL. We still need to run
install_gems (any package maintainers in the room??)
● sinatra
● rack
● thin
● uuidtools
● sequel
● aws-sdk, softlayer, azure, treetop, parse-cron
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6. OpenNebula in CentOS 7
Init Scripts
● systemd-sysv… we owe you!
(old system V scripts are compatible)
● Full migration to systemd in the next release
● Seriously, any package maintainers around?
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7. OpenNebula in CentOS 7
Contextualization – Cloud Init
● Cloud Init will be supported in this release
● Patched DataSourceOpenNebula.py in the CentOS package (the
predictable network interfaces have been a predictable pain!)
● Migrate from ifconfig to ip
● Image requirements
● Avahi unconfigures network
● Acpid to shut down the VM
● Sudoers: Defaults !requiretty
● Actions
● Network Contextualization
● SSH Public Key
● User Data
● Hostname
● One Image to rule the all! (AWS, OpenStack, OpenNebula, etc…)
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8. OpenNebula in CentOS 7
Contextualization – Native Packages
● Packages created by the OpenNebula Project
(with fpm no srpm, sorry! – easy to fix though)
● Actions
● Network
● DNS
● SSH Public Key
● SELinux
● Mount Swap
● Hostname
● Execute Scripts
● Easily extensible. Drop a script and you’re good to go.
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9. OpenNebula in CentOS 7
KVM
● Openebula-node-kvm works like a charm!
● KVM version 1.5.3 (CentOS 6 had 0.12!)
● Libvirt version 1.1.1 (CentOS 6 0.10)
● … YES! It’s worth upgrading to CentOS 7!
NETWORK TOOLS
● Replace vconfig with ip … type vlan …
● Replace ifconfig with ip …
SELinux
● oneadmin home is /var/lib/ne (no SSH allowed)
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10. OpenNebula Storage
GlusterFS
Libgfapi is supported (of course fuse is also supported)
OpenNebula runs as `oneadmin`:
/etc/glusterfs/glusterd.vol ->
option rpc-auth-allow-insecure on
$ gluster volume set <volume> server.allow-insecure on
$ gluster volume set <volume> storage.owner-uid <oneadmin uid>
$ gluster volume set <volume> storage.owner-gid <oneadmin gid>
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11. OpenNebula Storage
GlusterFS
/var/lib/glusterd/groups/virt ->
quick-read=off
read-ahead=off
io-cache=off
stat-prefetch=on
eager-lock=enable
remote-dio=enable
quorum-type=auto
server.allow-insecure=on
server-quorum-type=server
$ gluster volume set <volume> group virt
$ mkdir -p /var/lib/one/datastores/0
$ mount -t gluster server:/volume /var/lib/one/datastores/0
$ chown oneadmin:oneadmin /var/lib/one/datastores/0
$ ln -s /var/lib/one/datastores/0 /var/lib/one/datastores/1
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12. OpenNebula Storage
GlusterFS
NAME = "glusterfs"
DS_MAD = fs
TM_MAD = shared
# the following line *must* be preset
DISK_TYPE = GLUSTER
GLUSTER_HOST = gluster_server:24007
GLUSTER_VOLUME = one_vol
CLONE_TARGET="SYSTEM"
LN_TARGET="NONE"
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