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LIBVIRT Setup instructions
==========================
`libvirt` is an `openshift-ansible` provider that uses `libvirt` to create local Fedora VMs that are provisioned exactly the same way that cloud VMs would be provisioned.
This makes `libvirt` useful to develop, test and debug OpenShift and openshift-ansible locally on the developer’s workstation before going to the cloud.
Install dependencies
--------------------
1. Install [dnsmasq](http://www.thekelleys.org.uk/dnsmasq/doc.html)
2. Install [ebtables](http://ebtables.netfilter.org/)
3. Install [qemu](http://wiki.qemu.org/Main_Page)
4. Install [libvirt](http://libvirt.org/)
5. Enable and start the libvirt daemon, e.g:
- `systemctl enable libvirtd`
- `systemctl start libvirtd`
6. [Grant libvirt access to your user¹](https://libvirt.org/aclpolkit.html)
7. Check that your `$HOME` is accessible to the qemu user²
8. Configure dns resolution on the host³
#### ¹ Depending on your distribution, libvirt access may be denied by default or may require a password at each access.
You can test it with the following command:
```
virsh -c qemu:///system pool-list
```
If you have access error messages, please read https://libvirt.org/acl.html and https://libvirt.org/aclpolkit.html .
In short, if your libvirt has been compiled with Polkit support (ex: Arch, Fedora 21), you can create `/etc/polkit-1/rules.d/50-org.libvirt.unix.manage.rules` as follows to grant full access to libvirt to `$USER`
```
sudo /bin/sh -c "cat - > /etc/polkit-1/rules.d/50-org.libvirt.unix.manage.rules" << EOF
polkit.addRule(function(action, subject) {
if (action.id == "org.libvirt.unix.manage" &&
subject.user == "$USER") {
return polkit.Result.YES;
polkit.log("action=" + action);
polkit.log("subject=" + subject);
}
});
EOF
```
If your libvirt has not been compiled with Polkit (ex: Ubuntu 14.04.1 LTS), check the permissions on the libvirt unix socket:
```
ls -l /var/run/libvirt/libvirt-sock
srwxrwx--- 1 root libvirtd 0 févr. 12 16:03 /var/run/libvirt/libvirt-sock
usermod -a -G libvirtd $USER
# $USER needs to logout/login to have the new group be taken into account
```
(Replace `$USER` with your login name)
#### ² Qemu will run with a specific user. It must have access to the VMs drives
All the disk drive resources needed by the VMs (Fedora disk image, cloud-init files) are put inside `~/libvirt-storage-pool-openshift/`.
As we’re using the `qemu:///system` instance of libvirt, qemu will run with a specific `user:group` distinct from your user. It is configured in `/etc/libvirt/qemu.conf`. That qemu user must have access to that libvirt storage pool.
If your `$HOME` is world readable, everything is fine. If your `$HOME` is private, `ansible` will fail with an error message like:
```
error: Cannot access storage file '$HOME/libvirt-storage-pool-openshift/lenaic-master-216d8.qcow2' (as uid:99, gid:78): Permission denied
```
In order to fix that issue, you have several possibilities:
* set `libvirt_storage_pool_path` inside `playbooks/libvirt/openshift-cluster/launch.yml` and `playbooks/libvirt/openshift-cluster/terminate.yml` to a directory:
* backed by a filesystem with a lot of free disk space
* writable by your user;
* accessible by the qemu user.
* Grant the qemu user access to the storage pool.
On Arch:
```
setfacl -m g:kvm:--x ~
```
#### ³ Enabling DNS resolution to your guest VMs with NetworkManager
- Verify NetworkManager is configured to use dnsmasq:
```sh
$ sudo vi /etc/NetworkManager/NetworkManager.conf
[main]
dns=dnsmasq
```
- Configure dnsmasq to use the Virtual Network router for example.com:
```sh
sudo vi /etc/NetworkManager/dnsmasq.d/libvirt_dnsmasq.conf
server=/example.com/192.168.55.1
```
Test The Setup
--------------
1. cd openshift-ansible/
2. Try to list all instances (Passing an empty string as the cluster_id argument will result in all libvirt instances being listed)
```
bin/cluster list libvirt ''
```
Configuration
-------------
The following options can be passed via the `-o` flag of the `create` command or as environment variables:
* `image_url` (default to `http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2`): URL of the QCOW2 image to download
* `image_name` (default to `CentOS-7-x86_64-GenericCloud.qcow2`): Name of the QCOW2 image to boot the VMs on
* `image_sha256` (default to `e324e3ab1d24a1bbf035ddb365e7f9058c0b454acf48d7aa15c5519fae5998ab`): Expected SHA256 checksum of the downloaded image
* `skip_image_download` (default to `no`): Skip QCOW2 image download. This requires the `image_name` QCOW2 image to be already present in `$HOME/libvirt-storage-pool-openshift-ansible`
Creating a cluster
------------------
1. To create a cluster with one master and two nodes
```
bin/cluster create libvirt lenaic
```
Updating a cluster
------------------
1. To update the cluster
```
bin/cluster update libvirt lenaic
```
Terminating a cluster
---------------------
1. To terminate the cluster
```
bin/cluster terminate libvirt lenaic
```
|
