Set up flannel in your cluster!

contrib/ansible/README.md

@@ -47,4 +47,8 @@ Only the kubernetes nodes:
 
 `INVENTORY=myinventory ./setup.sh`
 
+Only flannel:
+
+    $ ./setup.sh --tags=flannel
+
 [![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/contrib/ansible/README.md?pixel)]()

contrib/ansible/cluster.yml

@@ -8,6 +8,17 @@
   tags:
         - etcd
 
+# install flannel
+- hosts:
+        - etcd
+        - masters
+        - nodes
+  sudo: yes
+  roles:
+        - flannel
+  tags:
+        - flannel
+
 # install kube master services
 - hosts: masters
   sudo: yes

contrib/ansible/group_vars/all.yml

@@ -1,3 +1,7 @@
+# Only used for the location to store flannel info in etcd, but may be used
+# for dns purposes and cluster id purposes in the future.
+cluster_name: kube.local
+
 # Account name of remote user. Ansible will use this user account to ssh into
 # the managed machines. The user must be able to use sudo without asking
 # for password unless ansible_sudo_pass is set
@@ -15,3 +19,18 @@ ansible_ssh_user: root
 # This range must not conflict with anything in your infrastructure. These
 # addresses do not need to be routable and must just be an unused block of space.
 kube_service_addresses: 10.254.0.0/16
+
+# Flannel internal network (optional). When flannel is used, it will assign IP
+# addresses from this range to individual pods.
+# This network must be unused in your network infrastructure!
+flannel_subnet: 172.16.0.0
+
+# Flannel internal network total size (optional). This is the prefix of the
+# entire flannel overlay network.  So the entirety of 172.16.0.0/12 must be
+# unused in your environment.
+flannel_prefix: 12
+
+# Flannel internal network (optional). This is the size allocation that flannel
+# will give to each node on your network.  With these defaults you should have
+# room for 4096 nodes with 254 pods per node.
+flannel_host_prefix: 24

contrib/ansible/roles/flannel/handlers/main.yml

@@ -0,0 +1,18 @@
+---
+- name: restart flannel
+  service: name=flanneld state=restarted
+  notify:
+    - stop docker
+    - delete docker0
+    - start docker
+  when: inventory_hostname in groups['nodes']
+
+- name: stop docker
+  service: name=docker state=stopped
+
+- name: delete docker0
+  command: ip link delete docker0
+  ignore_errors: yes
+
+- name: start docker
+  service: name=docker state=started

contrib/ansible/roles/flannel/meta/main.yml

@@ -0,0 +1,3 @@
+---
+dependencies:
+    - { role: common }

contrib/ansible/roles/flannel/tasks/client.yml

@@ -0,0 +1,17 @@
+---
+- name: Install flannel
+  action: "{{ ansible_pkg_mgr }}"
+  args:
+        name: flannel
+        state: latest
+  when: not is_atomic
+
+- name: Install Flannel config file
+  template: src=flanneld.j2 dest=/etc/sysconfig/flanneld
+  notify:
+          - restart flannel
+
+- name: Launch Flannel
+  service: name=flanneld state=started enabled=yes
+  notify:
+          - restart flannel

contrib/ansible/roles/flannel/tasks/config.yml

@@ -0,0 +1,23 @@
+---
+- name: Set facts about etcdctl command
+  set_fact:
+    peers: "{% for hostname in groups['etcd'] %}http://{{ hostname }}:2379{% if not loop.last %},{% endif %}{% endfor %}"
+    conf_file: "/tmp/flannel-conf.json"
+    conf_loc: "/{{ cluster_name }}/network/config"
+  run_once: true
+  delegate_to: "{{ groups['etcd'][0] }}"
+
+- name: Create flannel config file to go in etcd
+  template: src=flannel-conf.json.j2 dest={{ conf_file }}
+  run_once: true
+  delegate_to: "{{ groups['etcd'][0] }}"
+
+- name: Load the flannel config file into etcd
+  shell: "/usr/bin/etcdctl --no-sync --peers={{ peers }} set {{ conf_loc }} < {{ conf_file }}"
+  run_once: true
+  delegate_to: "{{ groups['etcd'][0] }}"
+
+- name: Clean up the flannel config file
+  file: path=/tmp/flannel-config.json state=absent
+  run_once: true
+  delegate_to: "{{ groups['etcd'][0] }}"

contrib/ansible/roles/flannel/tasks/main.yml

@@ -0,0 +1,5 @@
+---
+- include: config.yml
+
+- include: client.yml
+  when: inventory_hostname in groups['masters'] + groups['nodes']

contrib/ansible/roles/flannel/templates/flannel-conf.json.j2

@@ -0,0 +1 @@
+{ "Network": "{{ flannel_subnet }}/{{ flannel_prefix }}", "SubnetLen": {{ flannel_host_prefix }}, "Backend": { "Type": "vxlan" } }

contrib/ansible/roles/flannel/templates/flanneld.j2

@@ -0,0 +1,11 @@
+# Flanneld configuration options
+
+# etcd url location.  Point this to the server where etcd runs
+FLANNEL_ETCD="http://{{ groups['etcd'][0] }}:2379"
+
+# etcd config key.  This is the configuration key that flannel queries
+# For address range assignment
+FLANNEL_ETCD_KEY="/{{ cluster_name }}/network"
+
+# Any additional options that you want to pass
+#FLANNEL_OPTIONS=""