From 8b91a43576db8e67ec8cd949cfe76f9925479de0 Mon Sep 17 00:00:00 2001
From: Spencer Smith <robertspencersmith@gmail.com>
Date: Thu, 1 Sep 2016 10:01:15 -0700
Subject: [PATCH] remove dependency on kpm for kubedns

---
 roles/kubernetes-apps/defaults/main.yaml      |   4 -
 roles/kubernetes-apps/library/kube.py         | 318 ++++++++++++++++++
 roles/kubernetes-apps/tasks/main.yaml         |  42 +--
 .../kubernetes-apps/templates/kubedns-rc.yml  |  99 ++++++
 .../kubernetes-apps/templates/kubedns-svc.yml |  20 ++
 5 files changed, 455 insertions(+), 28 deletions(-)
 delete mode 100644 roles/kubernetes-apps/defaults/main.yaml
 create mode 100644 roles/kubernetes-apps/library/kube.py
 create mode 100644 roles/kubernetes-apps/templates/kubedns-rc.yml
 create mode 100644 roles/kubernetes-apps/templates/kubedns-svc.yml

diff --git a/roles/kubernetes-apps/defaults/main.yaml b/roles/kubernetes-apps/defaults/main.yaml
deleted file mode 100644
index d95001316..000000000
--- a/roles/kubernetes-apps/defaults/main.yaml
+++ /dev/null
@@ -1,4 +0,0 @@
----
-kpm_registry: "https://api.kpm.sh"
-kpm_namespace: "default"
-kpm_packages: []
\ No newline at end of file
diff --git a/roles/kubernetes-apps/library/kube.py b/roles/kubernetes-apps/library/kube.py
new file mode 100644
index 000000000..aab92a733
--- /dev/null
+++ b/roles/kubernetes-apps/library/kube.py
@@ -0,0 +1,318 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+DOCUMENTATION = """
+---
+module: kube
+short_description: Manage Kubernetes Cluster
+description:
+  - Create, replace, remove, and stop resources within a Kubernetes Cluster
+version_added: "2.0"
+options:
+  name:
+    required: false
+    default: null
+    description:
+      - The name associated with resource
+  filename:
+    required: false
+    default: null
+    description:
+      - The path and filename of the resource(s) definition file.
+  kubectl:
+    required: false
+    default: null
+    description:
+      - The path to the kubectl bin
+  namespace:
+    required: false
+    default: null
+    description:
+      - The namespace associated with the resource(s)
+  resource:
+    required: false
+    default: null
+    description:
+      - The resource to perform an action on. pods (po), replicationControllers (rc), services (svc)
+  label:
+    required: false
+    default: null
+    description:
+      - The labels used to filter specific resources.
+  server:
+    required: false
+    default: null
+    description:
+      - The url for the API server that commands are executed against.
+  api_version:
+    required: false
+    choices: ['v1', 'v1beta3']
+    default: v1
+    description:
+      - The API version associated with cluster.
+  force:
+    required: false
+    default: false
+    description:
+      - A flag to indicate to force delete, replace, or stop.
+  all:
+    required: false
+    default: false
+    description:
+      - A flag to indicate delete all, stop all, or all namespaces when checking exists.
+  log_level:
+    required: false
+    default: 0
+    description:
+      - Indicates the level of verbosity of logging by kubectl.
+  state:
+    required: false
+    choices: ['present', 'absent', 'latest', 'reloaded', 'stopped']
+    default: present
+    description:
+      - present handles checking existence or creating if definition file provided,
+        absent handles deleting resource(s) based on other options,
+        latest handles creating ore updating based on existence,
+        reloaded handles updating resource(s) definition using definition file,
+        stopped handles stopping resource(s) based on other options.
+requirements:
+  - kubectl
+author: "Kenny Jones (@kenjones-cisco)"
+"""
+
+EXAMPLES = """
+- name: test nginx is present
+  kube: name=nginx resource=rc state=present
+
+- name: test nginx is stopped
+  kube: name=nginx resource=rc state=stopped
+
+- name: test nginx is absent
+  kube: name=nginx resource=rc state=absent
+
+- name: test nginx is present
+  kube: filename=/tmp/nginx.yml
+"""
+
+
+class KubeManager(object):
+
+    def __init__(self, module):
+
+        self.module = module
+
+        self.kubectl = module.params.get('kubectl')
+        if self.kubectl is None:
+            self.kubectl =  module.get_bin_path('kubectl', True)
+        self.base_cmd = [self.kubectl]
+        self.api_version = module.params.get('api_version')
+
+        if self.api_version:
+            self.base_cmd.append('--api-version=' + self.api_version)
+
+        if module.params.get('server'):
+            self.base_cmd.append('--server=' + module.params.get('server'))
+
+        if module.params.get('log_level'):
+            self.base_cmd.append('--v=' + str(module.params.get('log_level')))
+
+        if module.params.get('namespace'):
+            self.base_cmd.append('--namespace=' + module.params.get('namespace'))
+
+        self.all = module.params.get('all')
+        self.force = module.params.get('force')
+        self.name = module.params.get('name')
+        self.filename = module.params.get('filename')
+        self.resource = module.params.get('resource')
+        self.label = module.params.get('label')
+
+    def _execute(self, cmd):
+        args = self.base_cmd + cmd
+        try:
+            rc, out, err = self.module.run_command(args)
+            if rc != 0:
+                self.module.fail_json(
+                    msg='error running kubectl (%s) command (rc=%d): %s' % (' '.join(args), rc, out or err))
+        except Exception as exc:
+            self.module.fail_json(
+                msg='error running kubectl (%s) command: %s' % (' '.join(args), str(exc)))
+        return out.splitlines()
+
+    def _execute_nofail(self, cmd):
+        args = self.base_cmd + cmd
+        rc, out, err = self.module.run_command(args)
+        if rc != 0:
+            return None
+        return out.splitlines()
+
+    def create(self, check=True):
+        if check and self.exists():
+            return []
+
+        cmd = ['create']
+
+        if not self.filename:
+            self.module.fail_json(msg='filename required to create')
+
+        cmd.append('--filename=' + self.filename)
+
+        return self._execute(cmd)
+
+    def replace(self):
+
+        if not self.force and not self.exists():
+            return []
+
+        cmd = ['replace']
+        if self.api_version != 'v1':
+            cmd = ['update']
+
+        if self.force:
+            cmd.append('--force')
+
+        if not self.filename:
+            self.module.fail_json(msg='filename required to reload')
+
+        cmd.append('--filename=' + self.filename)
+
+        return self._execute(cmd)
+
+    def delete(self):
+
+        if not self.force and not self.exists():
+            return []
+
+        cmd = ['delete']
+
+        if self.filename:
+            cmd.append('--filename=' + self.filename)
+        else:
+            if not self.resource:
+                self.module.fail_json(msg='resource required to delete without filename')
+
+            cmd.append(self.resource)
+
+            if self.name:
+                cmd.append(self.name)
+
+            if self.label:
+                cmd.append('--selector=' + self.label)
+
+            if self.all:
+                cmd.append('--all')
+
+            if self.force:
+                cmd.append('--ignore-not-found')
+
+        return self._execute(cmd)
+
+    def exists(self):
+        cmd = ['get']
+
+        if not self.resource:
+            return False
+
+        cmd.append(self.resource)
+
+        if self.name:
+            cmd.append(self.name)
+
+        cmd.append('--no-headers')
+
+        if self.label:
+            cmd.append('--selector=' + self.label)
+
+        if self.all:
+            cmd.append('--all-namespaces')
+
+        result = self._execute_nofail(cmd)
+        if not result:
+            return False
+        return True
+
+    def stop(self):
+
+        if not self.force and not self.exists():
+            return []
+
+        cmd = ['stop']
+
+        if self.filename:
+            cmd.append('--filename=' + self.filename)
+        else:
+            if not self.resource:
+                self.module.fail_json(msg='resource required to stop without filename')
+
+            cmd.append(self.resource)
+
+            if self.name:
+                cmd.append(self.name)
+
+            if self.label:
+                cmd.append('--selector=' + self.label)
+
+            if self.all:
+                cmd.append('--all')
+
+            if self.force:
+                cmd.append('--ignore-not-found')
+
+        return self._execute(cmd)
+
+
+def main():
+
+    module = AnsibleModule(
+        argument_spec=dict(
+            name=dict(),
+            filename=dict(),
+            namespace=dict(),
+            resource=dict(),
+            label=dict(),
+            server=dict(),
+            kubectl=dict(),
+            api_version=dict(default='v1', choices=['v1', 'v1beta3']),
+            force=dict(default=False, type='bool'),
+            all=dict(default=False, type='bool'),
+            log_level=dict(default=0, type='int'),
+            state=dict(default='present', choices=['present', 'absent', 'latest', 'reloaded', 'stopped']),
+            )
+        )
+
+    changed = False
+
+    manager = KubeManager(module)
+    state = module.params.get('state')
+
+    if state == 'present':
+        result = manager.create()
+
+    elif state == 'absent':
+        result = manager.delete()
+
+    elif state == 'reloaded':
+        result = manager.replace()
+
+    elif state == 'stopped':
+        result = manager.stop()
+
+    elif state == 'latest':
+        if manager.exists():
+            manager.force = True
+            result = manager.replace()
+        else:
+            result = manager.create(check=False)
+
+    else:
+        module.fail_json(msg='Unrecognized state %s.' % state)
+
+    if result:
+        changed = True
+    module.exit_json(changed=changed,
+                     msg='success: %s' % (' '.join(result))
+                     )
+
+
+from ansible.module_utils.basic import *  # noqa
+if __name__ == '__main__':
+    main()
diff --git a/roles/kubernetes-apps/tasks/main.yaml b/roles/kubernetes-apps/tasks/main.yaml
index c30a73d24..d5694c669 100644
--- a/roles/kubernetes-apps/tasks/main.yaml
+++ b/roles/kubernetes-apps/tasks/main.yaml
@@ -1,25 +1,19 @@
-- name: Install pip
-  action:
-    module: "{{ ansible_pkg_mgr }}"
-    name: "python-pip"
-    state: latest
-  when: ansible_os_family != "CoreOS" and kpm_packages | length > 0
+---
+- name: Kubernetes Apps | Lay Down KubeDNS Template
+  template: src={{item.file}} dest=/etc/kubernetes/{{item.file}}
+  with_items:
+    - {file: kubedns-rc.yml, type: rc}
+    - {file: kubedns-svc.yml, type: svc}
+  register: manifests
+  when: inventory_hostname == groups['kube-master'][0]
 
-- name: install kpm
-  pip:
-    name: "kpm"
-    state: "latest"
-  when: kpm_packages | length > 0
-
-- name: manage kubernetes applications
-  kpm:
-    namespace: "{{item.namespace | default(kpm_namespace | default('default'))}}"
-    registry: "{{item.registry | default(kpm_registry | default('https://api.kpm.sh'))}}"
-    state: "{{item.state | default(omit)}}"
-    version: "{{item.version | default(omit)}}"
-    variables: "{{item.variables | default(omit)}}"
-    name: "{{item.name}}"
-  with_items: "{{kpm_packages}}"
-  register: kpmresults
-  environment:
-    PATH: "{{ ansible_env.PATH }}:{{ bin_dir }}"
+- name: Kubernetes Apps | Start Resources
+  kube:
+    name: KubeDNS
+    namespace: kube-system
+    kubectl: "{{bin_dir}}/kubectl"
+    resource: "{{item.item.type}}"
+    filename: /etc/kubernetes/{{item.item.file}}
+    state: "{{item.changed | ternary('latest','present') }}"
+  with_items: "{{ manifests.results }}"
+  when: inventory_hostname == groups['kube-master'][0]
diff --git a/roles/kubernetes-apps/templates/kubedns-rc.yml b/roles/kubernetes-apps/templates/kubedns-rc.yml
new file mode 100644
index 000000000..2daaf044e
--- /dev/null
+++ b/roles/kubernetes-apps/templates/kubedns-rc.yml
@@ -0,0 +1,99 @@
+apiVersion: v1
+kind: ReplicationController
+metadata:
+  name: kube-dns-v19
+  namespace: kube-system
+  labels:
+    k8s-app: kube-dns
+    version: v19
+    kubernetes.io/cluster-service: "true"
+spec:
+  replicas: 1
+  selector:
+    k8s-app: kube-dns
+    version: v19
+  template:
+    metadata:
+      labels:
+        k8s-app: kube-dns
+        version: v19
+        kubernetes.io/cluster-service: "true"
+    spec:
+      containers:
+      - name: kubedns
+        image: gcr.io/google_containers/kubedns-amd64:1.6
+        resources:
+          # TODO: Set memory limits when we've profiled the container for large
+          # clusters, then set request = limit to keep this container in
+          # guaranteed class. Currently, this container falls into the
+          # "burstable" category so the kubelet doesn't backoff from restarting it.
+          limits:
+            cpu: 100m
+            memory: 170Mi
+          requests:
+            cpu: 100m
+            memory: 70Mi
+        livenessProbe:
+          httpGet:
+            path: /healthz
+            port: 8080
+            scheme: HTTP
+          initialDelaySeconds: 60
+          timeoutSeconds: 5
+          successThreshold: 1
+          failureThreshold: 5
+        readinessProbe:
+          httpGet:
+            path: /readiness
+            port: 8081
+            scheme: HTTP
+          # we poll on pod startup for the Kubernetes master service and
+          # only setup the /readiness HTTP server once that's available.
+          initialDelaySeconds: 30
+          timeoutSeconds: 5
+        args:
+        # command = "/kube-dns"
+        - --domain={{ cluster_name }}.
+        - --dns-port=10053
+        ports:
+        - containerPort: 10053
+          name: dns-local
+          protocol: UDP
+        - containerPort: 10053
+          name: dns-tcp-local
+          protocol: TCP
+      - name: dnsmasq
+        image: gcr.io/google_containers/kube-dnsmasq-amd64:1.3
+        args:
+        - --cache-size=1000
+        - --no-resolv
+        - --server=127.0.0.1#10053
+        ports:
+        - containerPort: 53
+          name: dns
+          protocol: UDP
+        - containerPort: 53
+          name: dns-tcp
+          protocol: TCP
+      - name: healthz
+        image: gcr.io/google_containers/exechealthz-amd64:1.1
+        resources:
+          # keep request = limit to keep this container in guaranteed class
+          limits:
+            cpu: 10m
+            memory: 50Mi
+          requests:
+            cpu: 10m
+            # Note that this container shouldn't really need 50Mi of memory. The
+            # limits are set higher than expected pending investigation on #29688.
+            # The extra memory was stolen from the kubedns container to keep the
+            # net memory requested by the pod constant.
+            memory: 50Mi
+        args:
+        - -cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1 >/dev/null && nslookup kubernetes.default.svc.cluster.local 127.0.0.1:10053 >/dev/null
+        - -port=8080
+        - -quiet
+        ports:
+        - containerPort: 8080
+          protocol: TCP
+      dnsPolicy: Default  # Don't use cluster DNS.
diff --git a/roles/kubernetes-apps/templates/kubedns-svc.yml b/roles/kubernetes-apps/templates/kubedns-svc.yml
new file mode 100644
index 000000000..4820525c5
--- /dev/null
+++ b/roles/kubernetes-apps/templates/kubedns-svc.yml
@@ -0,0 +1,20 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: kube-dns
+  namespace: kube-system
+  labels:
+    k8s-app: kube-dns
+    kubernetes.io/cluster-service: "true"
+    kubernetes.io/name: "KubeDNS"
+spec:
+  selector:
+    k8s-app: kube-dns
+  clusterIP: {{ skydns_server }}
+  ports:
+  - name: dns
+    port: 53
+    protocol: UDP
+  - name: dns-tcp
+    port: 53
+    protocol: TCP