Merge pull request #6 from ansibl8s/calico_bgp_peering_opt

Calico bgp peering opt

README.md

@@ -50,7 +50,7 @@ The main variables to change are located in the directory ```environments/[env_n
 - hosts: kube-master
   roles:
     - { role: kubernetes/master, tags: master }
-    - { role: apps/k8s-skydns, tags: ['skydns', 'apps']  }
+    - { role: apps/k8s-kubedns, tags: ['kubedns', 'apps']  }
     - { role: apps/k8s-fabric8, tags: ['fabric8', 'apps']  }
 
 - hosts: kube-node
@@ -122,7 +122,7 @@ In order to use this role you'll need the following entries in the file '*requir
   path: roles/apps
   # version: v1.0
 
-- src: https://github.com/ansibl8s/k8s-skydns.git
+- src: https://github.com/ansibl8s/k8s-kubedns.git
   path: roles/apps
   # version: v1.0
 ```
@@ -139,10 +139,10 @@ Finally update your playbook with the chosen role, and run it
 - hosts: kube-master
   roles:
     - { role: kubernetes/master, tags: master }
-    - { role: apps/k8s-skydns, tags: ['skydns', 'apps']  }
+    - { role: apps/k8s-kubedns, tags: ['kubedns', 'apps']  }
 ...
 ```
-Please refer to the [k8s-skydns readme](https://github.com/ansibl8s/k8s-skydns) for additionnal info.
+Please refer to the [k8s-kubdns readme](https://github.com/ansibl8s/k8s-kubedns) for additionnal info.
 
 #### Calico networking
 Check if the calico-node container is running
@@ -199,6 +199,6 @@ grep path .gitmodules | sed 's/.*= //'
 For instance if you will probably want to install a [dns server](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns) as it is **strongly recommanded**.
 In order to use this role you'll need to follow these steps
 ```
-git submodule init roles/apps/k8s-common roles/apps/k8s-skydns
+git submodule init roles/apps/k8s-common roles/apps/k8s-kubedns
 git submodule update
 ```

cluster.yml

@@ -14,8 +14,8 @@
 - hosts: kube-master
   roles:
     - { role: kubernetes/master, tags: master }
-    # Addons to be installed
-    # - { role: apps/k8s-skydns, tags: ['skydns', 'apps'] }
+    # Apps to be installed
+    # - { role: apps/k8s-kubedns, tags: ['kubedns', 'apps'] }
     # - { role: apps/k8s-fabric8, tags: ['fabric8', 'apps'] }
 
 - hosts: kube-node

environments/dev/group_vars/k8s-cluster.yml

@@ -31,6 +31,11 @@ overlay_network_subnet: 10.233.64.0/18
 # room for 4096 nodes with 254 pods per node.
 overlay_network_host_prefix: 24
 
+# With calico it is possible to distributed routes with border routers of the datacenter.
+peer_with_router: false
+# Warning : enabling router peering will disable calico's default behavior ('node mesh').
+# The subnets of each nodes will be distributed by the datacenter router
+
 # Internal DNS configuration.
 # Kubernetes can create and mainatain its own DNS server to resolve service names
 # into appropriate IP addresses. It's highly advisable to run such DNS server,

environments/dev/inventory

 [downloader]
-192.168.0.1
+172.16.0.1
 
 [kube-master]
 # NB : the br_addr must be in the {{ calico_pool }} subnet
 # it will assign a /24 subnet per node
-192.168.0.1 br_addr=10.233.64.1
-
-[kube-node]
-192.168.0.2 br_addr=10.233.65.1
-192.168.0.3 br_addr=10.233.66.1
-192.168.0.4 br_addr=10.233.67.1
+172.16.0.1 br_addr=10.233.64.1
 
 [etcd]
-192.168.0.1
+172.16.0.1
+
+[kube-node:children]
+usa
+france
+
+[usa]
+172.16.0.1 br_addr=10.233.64.1
+# Configure the as assigned to the each node if bgp peering with border routers is enabled
+172.16.0.2 br_addr=10.233.65.1 # local_as=65xxx
+172.16.0.3 br_addr=10.233.66.1 # local_as=65xxx
+
+[france]
+192.168.0.1 br_addr=10.233.67.1 # local_as=65xxx
+192.168.0.2 br_addr=10.233.68.1 # local_as=65xxx
 
 [k8s-cluster:children]
 kube-node
 kube-master
+
+# If you want to configure bgp peering with border router you'll need to set the following vars
+# List of routers and their as number
+#[usa:vars]
+#bgp_peers=[{"router_id": "172.16.0.252", "as": "65xxx"}, {"router_id": "172.16.0.253", "as": "65xxx"}]
+#
+#[france:vars]
+#bgp_peers=[{"router_id": "192.168.0.252", "as": "65xxx"}, {"router_id": "192.168.0.253", "as": "65xxx"}]

environments/production/group_vars/all.yml

 # Directory where the binaries will be installed
-# bin_dir: /usr/local/bin
+bin_dir: /usr/local/bin
 
 # Where the binaries will be downloaded.
 # Note: ensure that you've enough disk space (about 1G)
-# local_release_dir: "/tmp/releases"
+local_release_dir: "/tmp/releases"

environments/production/group_vars/k8s-cluster.yml

@@ -31,6 +31,11 @@
 # room for 4096 nodes with 254 pods per node.
 # overlay_network_host_prefix: 24
 
+# With calico it is possible to distributed routes with border routers of the datacenter.
+# peer_with_router: false
+# Warning : enabling router peering will disable calico's default behavior ('node mesh').
+# The subnets of each nodes will be distributed by the datacenter router
+
 # Internal DNS configuration.
 # Kubernetes can create and mainatain its own DNS server to resolve service names
 # into appropriate IP addresses. It's highly advisable to run such DNS server,

roles/overlay_network/tasks/calico.yml

 ---
-- name: Install calicoctl bin
+- name: Calico | Install calicoctl bin
   copy: 
      src={{ local_release_dir }}/calico/bin/calicoctl
      dest={{ bin_dir }}
      mode=u+x
   notify: restart calico-node
 
-- name: Create calicoctl symlink (needed by kubelet)
+- name: Calico | Create calicoctl symlink (needed by kubelet)
   file: src=/usr/local/bin/calicoctl dest=/usr/bin/calicoctl state=link
 
-- name: Write calico-node systemd init file
+- name: Calico | Write calico-node systemd init file
   template: src=calico/calico-node.service.j2 dest=/etc/systemd/system/calico-node.service
   notify: 
     - reload systemd
     - restart calico-node
 
-- name: Write network-environment
+- name: Calico | Write network-environment
   template: src=calico/network-environment.j2 dest=/etc/network-environment mode=u+x
   notify: 
     - reload systemd
     - restart calico-node
 
-- name: Enable calico-node
+- name: Calico | Enable calico-node
   service: name=calico-node enabled=yes state=started
 
-- name: Configure calico-node remove default pool
+- name: Calico | Configure calico-node remove default pool
   shell: calicoctl pool remove 192.168.0.0/16
   environment: 
      ETCD_AUTHORITY: "{{ groups['kube-master'][0] }}:4001"
   run_once: true
 
-- name: Configure calico-node desired pool
+- name: Calico | Configure calico-node desired pool
   shell: calicoctl pool add {{ overlay_network_subnet }}
   environment: 
      ETCD_AUTHORITY: "{{ groups['kube-master'][0] }}:4001"
   run_once: true
+
+- name: Calico | Disable node mesh
+  shell: calicoctl bgp node-mesh off
+  when: peer_with_router and inventory_hostname in groups['kube-node']
+
+- name: Calico | Configure peering with router(s)
+  shell: calicoctl node bgp peer add {{ item.router_id }} as {{ item.as }}
+  with_items: peers
+  when: peer_with_router and inventory_hostname in groups['kube-node']

roles/overlay_network/templates/calico/calico-node.service.j2

-[Unit]
-Description=calicoctl node
-After=etcd2.service
-
-[Service]
-EnvironmentFile=/etc/network-environment
-User=root
-PermissionsStartOnly=true
-ExecStartPre={{ bin_dir }}/calicoctl checksystem --fix
-{% if inventory_hostname in groups['kube-node'] %}
-ExecStart={{ bin_dir }}/calicoctl node --ip=${DEFAULT_IPV4} --kubernetes
-{% else %}
-ExecStart={{ bin_dir }}/calicoctl node --ip=${DEFAULT_IPV4}
-{% endif %}
-RemainAfterExit=yes
-Type=oneshot
-
-[Install]
-WantedBy=multi-user.target
+[Unit]
+Description=calicoctl node
+After=etcd2.service
+
+[Service]
+EnvironmentFile=/etc/network-environment
+User=root
+PermissionsStartOnly=true
+ExecStartPre={{ bin_dir }}/calicoctl checksystem --fix
+{% if inventory_hostname in groups['kube-node'] %}
+{%    if peer_with_router %}
+ExecStart={{ bin_dir }}/calicoctl node --ip=${DEFAULT_IPV4} --as={{ local_as }} --kubernetes
+{%     else %}
+ExecStart={{ bin_dir }}/calicoctl node --ip=${DEFAULT_IPV4} --kubernetes
+{%     endif %}
+{% else %}
+ExecStart={{ bin_dir }}/calicoctl node --ip=${DEFAULT_IPV4}
+{% endif %}
+RemainAfterExit=yes
+Type=oneshot
+
+[Install]
+WantedBy=multi-user.target