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Merge branch 'feature/terraform_floating_ips' of https://github.com/pcm32/kargo into feature/terraform_floating_ips

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Pablo Moreno 2016-11-02 11:25:26 +00:00
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contrib/terraform/openstack/README.md
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@ -5,14 +5,13 @@ Openstack.
## Status
This will install a Kubernetes cluster on an Openstack Cloud. It is tested on a
OpenStack Cloud provided by [BlueBox](https://www.blueboxcloud.com/) and
should work on most modern installs of OpenStack that support the basic
This will install a Kubernetes cluster on an Openstack Cloud. It has been tested on a
OpenStack Cloud provided by [BlueBox](https://www.blueboxcloud.com/) and on OpenStack at [EMBL-EBI's](http://www.ebi.ac.uk/) [EMBASSY Cloud](http://www.embassycloud.org/). This should work on most modern installs of OpenStack that support the basic
services.
There are some assumptions made to try and ensure it will work on your openstack cluster.
* floating-ips are used for access
* floating-ips are used for access, but you can have masters and nodes that don't use floating-ips if needed. You need currently at least 1 floating ip, which we would suggest is used on a master.
* you already have a suitable OS image in glance
* you already have both an internal network and a floating-ip pool created
* you have security-groups enabled
@ -24,16 +23,14 @@ There are some assumptions made to try and ensure it will work on your openstack
## Terraform
Terraform will be used to provision all of the OpenStack resources required to
run Docker Swarm. It is also used to deploy and provision the software
Terraform will be used to provision all of the OpenStack resources. It is also used to deploy and provision the software
requirements.
### Prep
#### OpenStack
Ensure your OpenStack credentials are loaded in environment variables. This is
how I do it:
Ensure your OpenStack credentials are loaded in environment variables. This can be done by downloading a credentials .rc file from your OpenStack dashboard and sourcing it:
```
$ source ~/.stackrc
@ -46,7 +43,7 @@ differences between OpenStack installs the Terraform does not attempt to create
these for you.
By default Terraform will expect that your networks are called `internal` and
`external`. You can change this by altering the Terraform variables `network_name` and `floatingip_pool`.
`external`. You can change this by altering the Terraform variables `network_name` and `floatingip_pool`. This can be done on a new variables file or through environment variables.
A full list of variables you can change can be found at [variables.tf](variables.tf).
@ -76,8 +73,21 @@ $ echo Setting up Terraform creds && \
export TF_VAR_auth_url=${OS_AUTH_URL}
```
If you want to provision master or node VMs that don't use floating ips, write on a `my-terraform-vars.tfvars` file, for example:
```
number_of_k8s_masters = "1"
number_of_k8s_masters_no_floating_ip = "2"
number_of_k8s_nodes_no_floating_ip = "1"
number_of_k8s_nodes = "0"
```
This will provision one VM as master using a floating ip, two additional masters using no floating ips (these will only have private ips inside your tenancy) and one VM as node, again without a floating ip.
# Provision a Kubernetes Cluster on OpenStack
If not using a tfvars file for your setup, then execute:
```
terraform apply -state=contrib/terraform/openstack/terraform.tfstate contrib/terraform/openstack
openstack_compute_secgroup_v2.k8s_master: Creating...
@ -96,6 +106,13 @@ use the `terraform show` command.
State path: contrib/terraform/openstack/terraform.tfstate
```
Alternatively, if you wrote your terraform variables on a file `my-terraform-vars.tfvars`, your command would look like:
```
terraform apply -state=contrib/terraform/openstack/terraform.tfstate -var-file=my-terraform-vars.tfvars contrib/terraform/openstack
```
if you choose to add masters or nodes without floating ips (only internal ips on your OpenStack tenancy), this script will create as well a file `contrib/terraform/openstack/k8s-cluster.yml` with an ssh command for ansible to be able to access your machines tunneling through the first floating ip used. If you want to manually handling the ssh tunneling to these machines, please delete or move that file. If you want to use this, just leave it there, as ansible will pick it up automatically.
Make sure you can connect to the hosts:
```
@ -114,6 +131,8 @@ example-k8s-master-1 | SUCCESS => {
}
```
if you are deploying a system that needs bootstrapping, like CoreOS, these might have a state `FAILED` due to CoreOS not having python. As long as the state is not `UNREACHABLE`, this is fine.
if it fails try to connect manually via SSH ... it could be somthing as simple as a stale host key.
Deploy kubernetes: