adds ability to have hosts with no floating ips on terraform/openstack
Pablo Moreno
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@ -5,14 +5,13 @@ Openstack.
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## Status
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This will install a Kubernetes cluster on an Openstack Cloud. It is tested on a
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OpenStack Cloud provided by [BlueBox](https://www.blueboxcloud.com/) and
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should work on most modern installs of OpenStack that support the basic
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This will install a Kubernetes cluster on an Openstack Cloud. It has been tested on a
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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
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services.
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There are some assumptions made to try and ensure it will work on your openstack cluster.
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* floating-ips are used for access
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* 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.
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* you already have a suitable OS image in glance
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* you already have both an internal network and a floating-ip pool created
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* you have security-groups enabled
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@ -24,16 +23,14 @@ There are some assumptions made to try and ensure it will work on your openstack
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## Terraform
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Terraform will be used to provision all of the OpenStack resources required to
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run Docker Swarm. It is also used to deploy and provision the software
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Terraform will be used to provision all of the OpenStack resources. It is also used to deploy and provision the software
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requirements.
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### Prep
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#### OpenStack
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Ensure your OpenStack credentials are loaded in environment variables. This is
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how I do it:
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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:
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```
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$ source ~/.stackrc
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@ -46,7 +43,7 @@ differences between OpenStack installs the Terraform does not attempt to create
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these for you.
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By default Terraform will expect that your networks are called `internal` and
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`external`. You can change this by altering the Terraform variables `network_name` and `floatingip_pool`.
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`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.
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A full list of variables you can change can be found at [variables.tf](variables.tf).
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@ -76,8 +73,21 @@ $ echo Setting up Terraform creds && \
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export TF_VAR_auth_url=${OS_AUTH_URL}
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```
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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:
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```
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number_of_k8s_masters = "1"
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number_of_k8s_masters_no_floating_ip = "2"
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number_of_k8s_nodes_no_floating_ip = "1"
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number_of_k8s_nodes = "0"
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```
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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.
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# Provision a Kubernetes Cluster on OpenStack
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If not using a tfvars file for your setup, then execute:
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```
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terraform apply -state=contrib/terraform/openstack/terraform.tfstate contrib/terraform/openstack
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openstack_compute_secgroup_v2.k8s_master: Creating...
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@ -96,6 +106,13 @@ use the `terraform show` command.
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State path: contrib/terraform/openstack/terraform.tfstate
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```
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Alternatively, if you wrote your terraform variables on a file `my-terraform-vars.tfvars`, your command would look like:
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```
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terraform apply -state=contrib/terraform/openstack/terraform.tfstate -var-file=my-terraform-vars.tfvars contrib/terraform/openstack
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```
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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.
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Make sure you can connect to the hosts:
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```
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@ -114,6 +131,8 @@ example-k8s-master-1 | SUCCESS => {
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}
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```
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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.
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if it fails try to connect manually via SSH ... it could be somthing as simple as a stale host key.
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Deploy kubernetes:
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@ -0,0 +1 @@
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ansible_ssh_common_args: '-o ProxyCommand="ssh -o StrictHostKeyChecking=no -W %h:%p -q USER@BASTION_ADDRESS"'
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@ -1,9 +1,14 @@
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# Valid bootstrap options (required): xenial, coreos, none
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bootstrap_os: "none"
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# Directory where the binaries will be installed
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bin_dir: /usr/local/bin
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# Where the binaries will be downloaded.
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# Note: ensure that you've enough disk space (about 1G)
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local_release_dir: "/tmp/releases"
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# Random shifts for retrying failed ops like pushing/downloading
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retry_stagger: 5
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# Uncomment this line for CoreOS only.
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# Directory where python binary is installed
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@ -28,6 +33,8 @@ kube_users:
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# Kubernetes cluster name, also will be used as DNS domain
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cluster_name: cluster.local
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# Subdomains of DNS domain to be resolved via /etc/resolv.conf
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ndots: 5
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# For some environments, each node has a pubilcally accessible
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# address and an address it should bind services to. These are
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@ -51,6 +58,16 @@ cluster_name: cluster.local
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# but don't know about that address themselves.
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# access_ip: 1.1.1.1
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# Etcd access modes:
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# Enable multiaccess to configure clients to access all of the etcd members directly
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# as the "http://hostX:port, http://hostY:port, ..." and ignore the proxy loadbalancers.
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# This may be the case if clients support and loadbalance multiple etcd servers natively.
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etcd_multiaccess: false
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# Assume there are no internal loadbalancers for apiservers exist and listen on
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# kube_apiserver_port (default 443)
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loadbalancer_apiserver_localhost: true
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# Choose network plugin (calico, weave or flannel)
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kube_network_plugin: flannel
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@ -89,10 +106,12 @@ kube_apiserver_insecure_port: 8080 # (http)
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# You still must manually configure all your containers to use this DNS server,
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# Kubernetes won't do this for you (yet).
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# Do not install additional dnsmasq
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skip_dnsmasq: false
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# Upstream dns servers used by dnsmasq
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upstream_dns_servers:
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- 8.8.8.8
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- 8.8.4.4
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#upstream_dns_servers:
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# - 8.8.8.8
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# - 8.8.4.4
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#
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# # Use dns server : https://github.com/ansibl8s/k8s-skydns/blob/master/skydns-README.md
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dns_setup: true
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@ -109,21 +128,6 @@ dns_server: "{{ kube_service_addresses|ipaddr('net')|ipaddr(2)|ipaddr('address')
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# like you would do when using nova-client before starting the playbook.
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# cloud_provider:
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# For multi masters architecture:
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# kube-proxy doesn't support multiple apiservers for the time being so you'll need to configure your own loadbalancer
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# This domain name will be inserted into the /etc/hosts file of all servers
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# configuration example with haproxy :
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# listen kubernetes-apiserver-https
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# bind 10.99.0.21:8383
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# option ssl-hello-chk
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# mode tcp
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# timeout client 3h
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# timeout server 3h
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# server master1 10.99.0.26:443
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# server master2 10.99.0.27:443
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# balance roundrobin
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# apiserver_loadbalancer_domain_name: "lb-apiserver.kubernetes.local"
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## Set these proxy values in order to update docker daemon to use proxies
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# http_proxy: ""
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# https_proxy: ""
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@ -134,3 +138,7 @@ dns_server: "{{ kube_service_addresses|ipaddr('net')|ipaddr(2)|ipaddr('address')
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## An obvious use case is allowing insecure-registry access
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## to self hosted registries like so:
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docker_options: "--insecure-registry={{ kube_service_addresses }}"
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# default packages to install within the cluster
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kpm_packages: []
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# - name: kube-system/grafana
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@ -70,6 +70,28 @@ resource "openstack_compute_instance_v2" "k8s_master" {
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ssh_user = "${var.ssh_user}"
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kubespray_groups = "etcd,kube-master,kube-node,k8s-cluster"
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}
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}
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resource "openstack_compute_instance_v2" "k8s_master_no_floating_ip" {
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name = "${var.cluster_name}-k8s-master-nf-${count.index+1}"
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count = "${var.number_of_k8s_masters_no_floating_ip}"
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image_name = "${var.image}"
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flavor_id = "${var.flavor_k8s_master}"
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key_pair = "${openstack_compute_keypair_v2.k8s.name}"
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network {
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name = "${var.network_name}"
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}
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security_groups = [ "${openstack_compute_secgroup_v2.k8s_master.name}",
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"${openstack_compute_secgroup_v2.k8s.name}" ]
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metadata = {
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ssh_user = "${var.ssh_user}"
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kubespray_groups = "etcd,kube-master,kube-node,k8s-cluster"
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}
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provisioner "local-exec" {
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command = "sed s/USER/${var.ssh_user}/ contrib/terraform/openstack/ansible_bastion_template.txt | sed s/BASTION_ADDRESS/${element(openstack_networking_floatingip_v2.k8s_master.*.address, 0)}/ > contrib/terraform/openstack/group_vars/k8s-cluster.yml"
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}
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}
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resource "openstack_compute_instance_v2" "k8s_node" {
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@ -89,6 +111,28 @@ resource "openstack_compute_instance_v2" "k8s_node" {
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}
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}
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resource "openstack_compute_instance_v2" "k8s_node_no_floating_ip" {
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name = "${var.cluster_name}-k8s-node-nf-${count.index+1}"
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count = "${var.number_of_k8s_nodes_no_floating_ip}"
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image_name = "${var.image}"
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flavor_id = "${var.flavor_k8s_node}"
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key_pair = "${openstack_compute_keypair_v2.k8s.name}"
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network {
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name = "${var.network_name}"
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}
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security_groups = ["${openstack_compute_secgroup_v2.k8s.name}" ]
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metadata = {
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ssh_user = "${var.ssh_user}"
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kubespray_groups = "kube-node,k8s-cluster"
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}
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provisioner "local-exec" {
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command = "sed s/USER/${var.ssh_user}/ contrib/terraform/openstack/ansible_bastion_template.txt | sed s/BASTION_ADDRESS/${element(openstack_networking_floatingip_v2.k8s_master.*.address, 0)}/ > contrib/terraform/openstack/group_vars/k8s-cluster.yml"
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}
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}
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#output "msg" {
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# value = "Your hosts are ready to go!\nYour ssh hosts are: ${join(", ", openstack_networking_floatingip_v2.k8s_master.*.address )}"
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#}
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@ -6,10 +6,18 @@ variable "number_of_k8s_masters" {
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default = 2
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}
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variable "number_of_k8s_masters_no_floating_ip" {
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default = 2
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}
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variable "number_of_k8s_nodes" {
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default = 1
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}
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variable "number_of_k8s_nodes_no_floating_ip" {
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default = 1
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}
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variable "public_key_path" {
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description = "The path of the ssh pub key"
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default = "~/.ssh/id_rsa.pub"
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