remove dependency on kpm for kubedns
This commit is contained in:
parent
602dba45ea
commit
8b91a43576
5 changed files with 455 additions and 28 deletions
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@ -1,4 +0,0 @@
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---
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kpm_registry: "https://api.kpm.sh"
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kpm_namespace: "default"
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kpm_packages: []
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318
roles/kubernetes-apps/library/kube.py
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318
roles/kubernetes-apps/library/kube.py
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@ -0,0 +1,318 @@
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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DOCUMENTATION = """
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---
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module: kube
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short_description: Manage Kubernetes Cluster
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description:
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- Create, replace, remove, and stop resources within a Kubernetes Cluster
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version_added: "2.0"
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options:
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name:
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required: false
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default: null
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description:
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- The name associated with resource
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filename:
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required: false
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default: null
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description:
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- The path and filename of the resource(s) definition file.
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kubectl:
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required: false
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default: null
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description:
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- The path to the kubectl bin
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namespace:
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required: false
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default: null
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description:
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- The namespace associated with the resource(s)
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resource:
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required: false
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default: null
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description:
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- The resource to perform an action on. pods (po), replicationControllers (rc), services (svc)
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label:
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required: false
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default: null
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description:
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- The labels used to filter specific resources.
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server:
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required: false
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default: null
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description:
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- The url for the API server that commands are executed against.
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api_version:
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required: false
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choices: ['v1', 'v1beta3']
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default: v1
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description:
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- The API version associated with cluster.
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force:
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required: false
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default: false
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description:
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- A flag to indicate to force delete, replace, or stop.
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all:
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required: false
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default: false
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description:
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- A flag to indicate delete all, stop all, or all namespaces when checking exists.
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log_level:
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required: false
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default: 0
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description:
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- Indicates the level of verbosity of logging by kubectl.
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state:
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required: false
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choices: ['present', 'absent', 'latest', 'reloaded', 'stopped']
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default: present
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description:
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- present handles checking existence or creating if definition file provided,
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absent handles deleting resource(s) based on other options,
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latest handles creating ore updating based on existence,
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reloaded handles updating resource(s) definition using definition file,
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stopped handles stopping resource(s) based on other options.
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requirements:
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- kubectl
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author: "Kenny Jones (@kenjones-cisco)"
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"""
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EXAMPLES = """
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- name: test nginx is present
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kube: name=nginx resource=rc state=present
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- name: test nginx is stopped
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kube: name=nginx resource=rc state=stopped
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- name: test nginx is absent
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kube: name=nginx resource=rc state=absent
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- name: test nginx is present
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kube: filename=/tmp/nginx.yml
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"""
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class KubeManager(object):
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def __init__(self, module):
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self.module = module
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self.kubectl = module.params.get('kubectl')
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if self.kubectl is None:
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self.kubectl = module.get_bin_path('kubectl', True)
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self.base_cmd = [self.kubectl]
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self.api_version = module.params.get('api_version')
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if self.api_version:
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self.base_cmd.append('--api-version=' + self.api_version)
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if module.params.get('server'):
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self.base_cmd.append('--server=' + module.params.get('server'))
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if module.params.get('log_level'):
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self.base_cmd.append('--v=' + str(module.params.get('log_level')))
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if module.params.get('namespace'):
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self.base_cmd.append('--namespace=' + module.params.get('namespace'))
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self.all = module.params.get('all')
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self.force = module.params.get('force')
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self.name = module.params.get('name')
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self.filename = module.params.get('filename')
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self.resource = module.params.get('resource')
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self.label = module.params.get('label')
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def _execute(self, cmd):
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args = self.base_cmd + cmd
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try:
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rc, out, err = self.module.run_command(args)
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if rc != 0:
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self.module.fail_json(
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msg='error running kubectl (%s) command (rc=%d): %s' % (' '.join(args), rc, out or err))
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except Exception as exc:
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self.module.fail_json(
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msg='error running kubectl (%s) command: %s' % (' '.join(args), str(exc)))
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return out.splitlines()
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def _execute_nofail(self, cmd):
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args = self.base_cmd + cmd
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rc, out, err = self.module.run_command(args)
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if rc != 0:
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return None
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return out.splitlines()
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def create(self, check=True):
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if check and self.exists():
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return []
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cmd = ['create']
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if not self.filename:
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self.module.fail_json(msg='filename required to create')
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cmd.append('--filename=' + self.filename)
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return self._execute(cmd)
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def replace(self):
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if not self.force and not self.exists():
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return []
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cmd = ['replace']
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if self.api_version != 'v1':
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cmd = ['update']
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if self.force:
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cmd.append('--force')
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if not self.filename:
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self.module.fail_json(msg='filename required to reload')
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cmd.append('--filename=' + self.filename)
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return self._execute(cmd)
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def delete(self):
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if not self.force and not self.exists():
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return []
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cmd = ['delete']
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if self.filename:
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cmd.append('--filename=' + self.filename)
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else:
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if not self.resource:
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self.module.fail_json(msg='resource required to delete without filename')
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cmd.append(self.resource)
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if self.name:
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cmd.append(self.name)
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if self.label:
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cmd.append('--selector=' + self.label)
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if self.all:
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cmd.append('--all')
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if self.force:
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cmd.append('--ignore-not-found')
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return self._execute(cmd)
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def exists(self):
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cmd = ['get']
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if not self.resource:
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return False
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cmd.append(self.resource)
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if self.name:
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cmd.append(self.name)
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cmd.append('--no-headers')
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if self.label:
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cmd.append('--selector=' + self.label)
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if self.all:
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cmd.append('--all-namespaces')
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result = self._execute_nofail(cmd)
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if not result:
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return False
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return True
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def stop(self):
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if not self.force and not self.exists():
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return []
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cmd = ['stop']
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if self.filename:
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cmd.append('--filename=' + self.filename)
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else:
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if not self.resource:
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self.module.fail_json(msg='resource required to stop without filename')
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cmd.append(self.resource)
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if self.name:
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cmd.append(self.name)
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if self.label:
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cmd.append('--selector=' + self.label)
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if self.all:
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cmd.append('--all')
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if self.force:
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cmd.append('--ignore-not-found')
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return self._execute(cmd)
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def main():
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module = AnsibleModule(
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argument_spec=dict(
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name=dict(),
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filename=dict(),
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namespace=dict(),
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resource=dict(),
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label=dict(),
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server=dict(),
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kubectl=dict(),
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api_version=dict(default='v1', choices=['v1', 'v1beta3']),
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force=dict(default=False, type='bool'),
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all=dict(default=False, type='bool'),
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log_level=dict(default=0, type='int'),
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state=dict(default='present', choices=['present', 'absent', 'latest', 'reloaded', 'stopped']),
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)
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)
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changed = False
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manager = KubeManager(module)
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state = module.params.get('state')
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if state == 'present':
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result = manager.create()
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elif state == 'absent':
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result = manager.delete()
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elif state == 'reloaded':
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result = manager.replace()
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elif state == 'stopped':
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result = manager.stop()
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elif state == 'latest':
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if manager.exists():
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manager.force = True
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result = manager.replace()
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else:
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result = manager.create(check=False)
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else:
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module.fail_json(msg='Unrecognized state %s.' % state)
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if result:
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changed = True
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module.exit_json(changed=changed,
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msg='success: %s' % (' '.join(result))
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)
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from ansible.module_utils.basic import * # noqa
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if __name__ == '__main__':
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main()
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@ -1,25 +1,19 @@
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- name: Install pip
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action:
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module: "{{ ansible_pkg_mgr }}"
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name: "python-pip"
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state: latest
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when: ansible_os_family != "CoreOS" and kpm_packages | length > 0
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---
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- name: Kubernetes Apps | Lay Down KubeDNS Template
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template: src={{item.file}} dest=/etc/kubernetes/{{item.file}}
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with_items:
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- {file: kubedns-rc.yml, type: rc}
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- {file: kubedns-svc.yml, type: svc}
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register: manifests
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when: inventory_hostname == groups['kube-master'][0]
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- name: install kpm
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pip:
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name: "kpm"
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state: "latest"
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when: kpm_packages | length > 0
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- name: manage kubernetes applications
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kpm:
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namespace: "{{item.namespace | default(kpm_namespace | default('default'))}}"
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registry: "{{item.registry | default(kpm_registry | default('https://api.kpm.sh'))}}"
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state: "{{item.state | default(omit)}}"
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version: "{{item.version | default(omit)}}"
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variables: "{{item.variables | default(omit)}}"
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name: "{{item.name}}"
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with_items: "{{kpm_packages}}"
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register: kpmresults
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environment:
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PATH: "{{ ansible_env.PATH }}:{{ bin_dir }}"
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- name: Kubernetes Apps | Start Resources
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kube:
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name: KubeDNS
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namespace: kube-system
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kubectl: "{{bin_dir}}/kubectl"
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resource: "{{item.item.type}}"
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filename: /etc/kubernetes/{{item.item.file}}
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state: "{{item.changed | ternary('latest','present') }}"
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with_items: "{{ manifests.results }}"
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when: inventory_hostname == groups['kube-master'][0]
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99
roles/kubernetes-apps/templates/kubedns-rc.yml
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99
roles/kubernetes-apps/templates/kubedns-rc.yml
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apiVersion: v1
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kind: ReplicationController
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metadata:
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name: kube-dns-v19
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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version: v19
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kubernetes.io/cluster-service: "true"
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spec:
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replicas: 1
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selector:
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k8s-app: kube-dns
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version: v19
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template:
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metadata:
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labels:
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k8s-app: kube-dns
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version: v19
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kubernetes.io/cluster-service: "true"
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spec:
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containers:
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- name: kubedns
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image: gcr.io/google_containers/kubedns-amd64:1.6
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resources:
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# TODO: Set memory limits when we've profiled the container for large
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# clusters, then set request = limit to keep this container in
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# guaranteed class. Currently, this container falls into the
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# "burstable" category so the kubelet doesn't backoff from restarting it.
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limits:
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cpu: 100m
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memory: 170Mi
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requests:
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cpu: 100m
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memory: 70Mi
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livenessProbe:
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httpGet:
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path: /healthz
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port: 8080
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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readinessProbe:
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httpGet:
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path: /readiness
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port: 8081
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scheme: HTTP
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# we poll on pod startup for the Kubernetes master service and
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# only setup the /readiness HTTP server once that's available.
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initialDelaySeconds: 30
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timeoutSeconds: 5
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args:
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# command = "/kube-dns"
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- --domain={{ cluster_name }}.
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- --dns-port=10053
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ports:
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- containerPort: 10053
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name: dns-local
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protocol: UDP
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- containerPort: 10053
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name: dns-tcp-local
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protocol: TCP
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- name: dnsmasq
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image: gcr.io/google_containers/kube-dnsmasq-amd64:1.3
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args:
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- --cache-size=1000
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- --no-resolv
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- --server=127.0.0.1#10053
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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- name: healthz
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image: gcr.io/google_containers/exechealthz-amd64:1.1
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resources:
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# keep request = limit to keep this container in guaranteed class
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limits:
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cpu: 10m
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memory: 50Mi
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requests:
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cpu: 10m
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# Note that this container shouldn't really need 50Mi of memory. The
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# limits are set higher than expected pending investigation on #29688.
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# The extra memory was stolen from the kubedns container to keep the
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# net memory requested by the pod constant.
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memory: 50Mi
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args:
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- -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
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- -port=8080
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- -quiet
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ports:
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- containerPort: 8080
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protocol: TCP
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dnsPolicy: Default # Don't use cluster DNS.
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20
roles/kubernetes-apps/templates/kubedns-svc.yml
Normal file
20
roles/kubernetes-apps/templates/kubedns-svc.yml
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apiVersion: v1
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kind: Service
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metadata:
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name: kube-dns
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namespace: kube-system
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labels:
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k8s-app: kube-dns
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kubernetes.io/cluster-service: "true"
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kubernetes.io/name: "KubeDNS"
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spec:
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selector:
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k8s-app: kube-dns
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clusterIP: {{ skydns_server }}
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ports:
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- name: dns
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port: 53
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protocol: UDP
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- name: dns-tcp
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port: 53
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protocol: TCP
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